WO2013153618A1 - アルミナの製造方法 - Google Patents
アルミナの製造方法 Download PDFInfo
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- WO2013153618A1 WO2013153618A1 PCT/JP2012/059775 JP2012059775W WO2013153618A1 WO 2013153618 A1 WO2013153618 A1 WO 2013153618A1 JP 2012059775 W JP2012059775 W JP 2012059775W WO 2013153618 A1 WO2013153618 A1 WO 2013153618A1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/34—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts
- C01F7/36—Preparation of aluminium hydroxide by precipitation from solutions containing aluminium salts from organic aluminium salts
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
- C01F7/00—Compounds of aluminium
- C01F7/02—Aluminium oxide; Aluminium hydroxide; Aluminates
- C01F7/44—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water
- C01F7/441—Dehydration of aluminium oxide or hydroxide, i.e. all conversions of one form into another involving a loss of water by calcination
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0051—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity
- C04B38/0054—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof characterised by the pore size, pore shape or kind of porosity the pores being microsized or nanosized
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/51—Particles with a specific particle size distribution
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/60—Particles characterised by their size
- C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/10—Solid density
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/11—Powder tap density
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/12—Surface area
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/14—Pore volume
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/16—Pore diameter
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2006/00—Physical properties of inorganic compounds
- C01P2006/80—Compositional purity
Definitions
- the present invention relates to an alumina production method, and more specifically, for example, suitably used as a material for forming an insulating inorganic oxide porous film formed on the surface of a positive electrode, a negative electrode, or a separator constituting a lithium ion secondary battery.
- the present invention relates to a method for producing high-purity alumina.
- Alumina (Al 2 O 3 ) is widely used in various applications because it has excellent physical and chemical properties such as heat resistance, insulation, wear resistance, and corrosion resistance.
- High-purity alumina having an alumina purity of 99.99% or more and a fine and uniform particle size is a single crystal material such as a light-transmitting tube for a high-pressure sodium lamp, sapphire for a watch window, a high-strength ceramic tool, a magnetic Widely used in tape abrasives.
- Patent Document 1 describes a method of hydrolyzing aluminum alkoxide and firing the resulting aluminum hydroxide.
- alumina obtained by hydrolyzing aluminum alkoxide and calcining the obtained aluminum hydroxide is in a state of aggregated particles in which secondary particles in which primary particles and primary particles are joined are aggregated. Therefore, in order to obtain a monodispersed powder having a small particle size and a sharp particle size distribution, it is necessary to perform a pulverization treatment in which the aggregated particles are dispersed and then pulverized.
- pulverizing alumina the smaller the particle diameter, the higher the growth rate and shrinkage rate of the bonded portion of the particles.
- Patent Document 1 there is a method for obtaining easily dispersible fine particles with few aggregated particles, such as utilizing a hydrolysis reaction at a low concentration to which a solvent other than the alcohol forming the aluminum alkoxide is added. Although it has been proposed, industrial productivity is poor.
- the present invention has been proposed in view of such circumstances, and can prevent generation and contamination of re-agglomerated particles, and can obtain high-purity alumina with less agglomerated particles and less foreign matter. It aims at providing the manufacturing method of an alumina.
- the present inventor obtained by firing using aluminum hydroxide having a predetermined cumulative pore volume obtained by hydrolyzing aluminum alkoxide.
- the present inventors have found that a high-purity alumina with few aggregated particles and few foreign matters can be obtained by pulverizing the fired body under a predetermined condition using an airflow pulverizer.
- the present invention relates to the following inventions.
- Water obtained by hydrolyzing aluminum alkoxide and having a cumulative pore volume (pore radius of 0.01 ⁇ m or more and 1 ⁇ m or less) measured by mercury porosimetry is 0.6 mL / g or more
- the aluminum hydroxide has a light bulk density of 0.10 to 0.25 g / cm 3 and a heavy bulk density of 0.15 to 0.30 g / cm 3 .
- a method for producing alumina is a method for producing alumina.
- the above aluminum hydroxide is obtained by adding an alcohol solution having a water concentration of 5 to 30% by weight to an aluminum alkoxide in a solution containing aluminum alkoxide obtained by solid-liquid reaction between metal aluminum and alcohol.
- a first hydrolysis step in which water is added so as to have a molar ratio of 1.5 to 2.0 and hydrolysis, and after alcohol is separated and recovered from the mixed solution after the first hydrolysis step, And a second hydrolysis step of adding and hydrolyzing so that the molar ratio of water to aluminum alkoxide is 1.0 to 7.0.
- the pulverization chamber of the airflow type pulverizer includes a powder contact portion where particles of the swirling alumina fired body collide, and the powder contact portion is formed of SUS or alumina ceramics.
- a method for producing alumina is described in detail below.
- alumina According to the method for producing alumina according to the present invention, generation and contamination of re-agglomerated particles can be prevented, and high-purity alumina with few agglomerated particles and little foreign matter can be obtained.
- the method for producing alumina according to the present invention is obtained by hydrolyzing aluminum alkoxide, and has a cumulative pore volume (range of pore radius of 0.01 ⁇ m or more and 1 ⁇ m or less) measured by mercury porosimetry.
- crushing step S12 for crushing at 500 m / s or more.
- Alumina produced by this production method can be suitably used as a material for forming an inorganic oxide porous film used for, for example, a positive electrode, a negative electrode, or a separator constituting a lithium ion secondary battery, and has good ion permeability.
- An inorganic oxide porous film excellent in heat resistance and insulation can be formed.
- high-purity alumina includes not only the meaning of high-purity alumina with few impurities, but also the meaning of alumina containing less foreign substances that are not alumina components.
- Firing step of aluminum hydroxide First, the method for producing alumina according to the present invention is obtained by hydrolyzing aluminum alkoxide, and its cumulative pore volume (range of pore radius of 0.01 ⁇ m or more and 1 ⁇ m or less) is 0.6 mL / g. It is characterized by firing using the above aluminum hydroxide.
- Aluminum hydroxide with a cumulative pore volume of 0.6 mL / g or more obtained by hydrolyzing this aluminum alkoxide has very small primary particles, excellent dispersibility, and few aggregated particles. . Therefore, the alumina calcined body obtained by calcining this aluminum hydroxide can prevent the generation of hard-aggregated alumina agglomerated particles that are firmly bonded, and by crushing under predetermined conditions in the crushing step described later, It can be easily pulverized (dispersed). Thereby, high-purity alumina with few aggregated particles and few foreign substances can be produced.
- this aluminum hydroxide is excellent in shape retention, and can be easily molded and granulated by adding only water. Can be prevented.
- the upper limit value of the cumulative pore volume is preferably 10 mL / g or less. If it is larger than 10 mL / g, there is a problem that it takes too much time to dry and fire the molded body or granulated body to form an alumina molded body because water is retained excessively.
- the cumulative pore volume of aluminum hydroxide described above can be measured by a mercury intrusion method.
- pressure is applied to intrude mercury into the pores of a powder sample, a mercury intrusion curve representing the relationship between the pressure applied to mercury and the amount of mercury intrusion is obtained, and based on the mercury intrusion curve. , Pore distribution curve, pore volume, specific surface area and the like.
- the mercury intrusion measurement can be performed using a mercury porosimeter.
- the pore distribution curve measured by the mercury intrusion method represents the relationship between the size of the pore radius of the sample and the total pore volume at each pore radius.
- aluminum hydroxide used in this calcination is preferably loosed bulk density thereof is 0.10 ⁇ 0.25g / cm 3, more preferably 0.14 ⁇ 0.18g / cm 3.
- the heavy bulk density is preferably 0.15 to 0.30 g / cm 3 , more preferably 0.17 to 0.22 g / cm 3 .
- the cumulative pore volume is 0.6 mL / g or more
- the light bulk density is 0.10 to 0.25 g / cm 3
- the heavy bulk density is 0.15 to 0.30 g.
- Light bulk density is obtained by the method described in JIS R 9301-2-3. In other words, prevent the vibration, determine the mass of the sample collected by dropping the sample (aluminum hydroxide powder) freely into a container (cylinder) with a known volume, and then divide this mass by the sample volume.
- the density calculated in The “heavy bulk density” is a density calculated from the volume of the sample after measuring the light bulk density and then dropping the cylinder containing the sample 100 times from a predetermined height to compress the sample. .
- Aluminum alkoxide production process In the aluminum alkoxide production process S21, as shown in the following formula (1), an aluminum alkoxide (by a solid-liquid reaction between metal aluminum (Al) and alcohol (ROH) ( Al (OR) 3 ) is generated. Al + 3ROH ⁇ Al (OR) 3 + 3 / 2H 2 (1)
- each R is independently methyl, ethyl, normal propyl, isopropyl, normal butyl, isobutyl, neobutyl, normal pentyl, isopentyl, neopentyl, normal hexyl, isohexyl, neohexyl, normal heptyl, isoheptyl, neohebutyl, normal octyl, It is at least one selected from isooctyl and neooctyl. In particular, at least one selected from methyl, ethyl, normal propyl, and isopropyl is preferable.
- the metal aluminum as a raw material is not particularly limited, high-purity aluminum having an impurity content of iron, silicon, copper, magnesium or the like of 100 ppm or less and a purity of 99.99% or more is used in the metal. preferable. By using such high-purity metallic aluminum, high-purity alumina with a small impurity content can be produced more effectively. In addition, it is not necessary to purify aluminum alkoxide obtained using the metal aluminum, thereby increasing efficiency.
- the metal shape is not particularly limited, and may be any form such as an ingot, a pellet, a foil, a wire, and a powder.
- the alcohol as the raw material for forming the liquid phase is a monohydric alcohol having 1 to 8 carbon atoms, preferably 1 to 4 carbon atoms.
- the alcohol used as a raw material generally has a lower reactivity with metallic aluminum as the carbon chain becomes longer. More specifically, examples of the alcohol used as a raw material include methyl alcohol, ethyl alcohol, n-propyl alcohol, isopropyl alcohol, n-butyl alcohol, sec-butyl alcohol, and tert-butyl alcohol. Among them, it is particularly preferable to use isopropyl alcohol.
- the water concentration of the alcohol is preferably 500 to 4500 ppm, more preferably 1000 to 4000 ppm, and particularly preferably 2000 to 3500 ppm. By setting the water concentration of alcohol within such a range, aluminum alkoxide can be produced efficiently.
- the water concentration of alcohol is represented by the weight of water relative to the total weight of alcohol.
- a solvent that is inert with respect to metal aluminum and that can dissolve the alcohol and aluminum alkoxide that is a product may be used.
- a liquid phase can be comprised with solvent, such as benzene and toluene, with alcohol.
- solvent such as benzene and toluene
- the reaction rate decreases when ketones are contained in the solvent.
- the ketone concentration in the solvent containing alcohol is preferably about 130 ppm or less that does not affect the solid-liquid reaction.
- the reaction temperature of the metal aluminum and the alcohol is not particularly limited as long as the reaction proceeds, but from the viewpoint of promoting the reaction between the metal aluminum and the alcohol, the reaction should be performed under the boiling point of the solvent system used and under reflux conditions. Is preferred.
- This aluminum alkoxide generation step S21 generates aluminum alkoxide having an alkoxy group corresponding to the alcohol used as described above. More specifically, aluminum alkoxide, aluminum ethoxide, aluminum n-propoxide, aluminum isopropoxide, aluminum n-butoxide, aluminum sec-butoxide, aluminum t-butoxide, and the like are generated.
- the above-described aluminum alkoxide produced in the aluminum alkoxide production step S21 is hydrolyzed.
- the aluminum alkoxide used at this time is obtained water. You may make it use the derivative
- hydrolysis step S22 the aluminum alkoxide produced in the aluminum alkoxide production step S21 is hydrolyzed to produce aluminum hydroxide.
- Aluminum hydroxide produced by hydrolysis is usually ultrafine particles having a particle size of several tens of nm, although depending on the hydrolysis conditions.
- this hydrolysis step S22 it is preferable to subject the aluminum alkoxide to a two-stage hydrolysis treatment. Specifically, first, as the first hydrolysis treatment, a local reaction caused by a sudden exotherm is caused by advancing the hydrolysis treatment on a part of aluminum alkoxide using an alcohol solution containing a predetermined concentration of water. A mild hydrolysis reaction is caused without causing (first hydrolysis step S31). Then, as the second hydrolysis treatment, water is further added to proceed with the hydrolysis treatment for the total amount of aluminum alkoxide (second hydrolysis step S32).
- the hydrolysis conditions are appropriately set by further hydrolyzing the total amount of aluminum alkoxide using water. It is possible to control, and the production of strong aggregated particles can be suppressed, and aluminum hydroxide with less aggregation can be produced.
- the cumulative pore volume (the range where the pore radius is 0.01 ⁇ m or more and 1 ⁇ m or less) measured by the mercury intrusion method is 0.6 mL / g or more
- the light bulk density is Aluminum hydroxide having a bulk density of 0.10 to 0.25 g / cm 3 and a heavy bulk density of 0.15 to 0.30 g / cm 3 can be produced.
- the alcohol used in the aluminum alkoxide production step S21 can be efficiently recovered in the alcohol recovery described in detail later. .
- First hydrolysis step More specifically, first, in the first hydrolysis step S31, an aluminum alkoxide is hydrolyzed using an alcohol solution containing a predetermined concentration of water.
- this first hydrolysis step S31 not only water but also an alcohol solution containing a predetermined concentration of water is added to a solution containing aluminum alkoxide.
- the water concentration of the alcohol solution to be added is 5 to 30% by weight, preferably 5 to 20% by weight, more preferably 5 to 10% by weight.
- concentration of water in the alcohol solution is less than 5% by weight, hydrolysis becomes insufficient, while when it exceeds 30% by weight, a local hydrolysis reaction occurs, causing aggregation of aluminum hydroxide. there is a possibility.
- the first hydrolysis step S31 an alcohol solution containing water having the above-described concentration is added so that the molar ratio of water to aluminum alkoxide is 1.5 to 2.0. To do. If the molar ratio of the water in the alcohol solution to the aluminum alkoxide is less than 1.5, the hydrolysis of the aluminum alkoxide is excessively suppressed. On the other hand, when the molar ratio exceeds 2.0, the hydrolysis of aluminum alkoxide is accelerated and a local hydrolysis reaction occurs, which may cause aggregation of aluminum hydroxide. In addition, since excess water that is not used for hydrolysis is included, in the alcohol recovery described later, the recovered alcohol contains water, which is reused in the aluminum alkoxide generation step S21. In this case, the production rate of aluminum alkoxide is reduced and productivity is deteriorated.
- the reaction temperature at the time of hydrolyzing aluminum alkoxide using an alcohol solution containing water is not particularly limited, and can be, for example, from room temperature to the boiling point of the solvent.
- the method for recovering alcohol from the mixed solution is not particularly limited. For example, a method for separating and recovering the mixed solution after the hydrolysis treatment in the first hydrolysis step through a column packed with an ion exchange resin. Is mentioned.
- the second hydrolysis step S32 water is added so that the molar ratio of aluminum alkoxide to water is 1.0 to 7.0, more preferably 1.5 to 3.0. To hydrolyze. If the molar ratio of aluminum alkoxide to water is less than 1.0, it may not be possible to perform hydrolysis on the total amount of aluminum alkoxide. On the other hand, when the molar ratio exceeds 7.0, the amount of water contained in the produced aluminum hydroxide increases, the time required for drying during the drying process increases, and the productivity decreases.
- reaction temperature is not particularly limited, and can be, for example, a temperature from room temperature to the boiling point of the solvent.
- the obtained aluminum hydroxide is dried.
- dry powdered aluminum hydroxide can be obtained.
- the alcohol solution can be recovered.
- the drying method is not particularly limited, and for example, a method of evaporating moisture by heating aluminum hydroxide is preferable. It does not specifically limit as drying temperature, For example, it is preferable to set it as the boiling point or more of a solvent.
- the drying method is not particularly limited, and for example, a stationary material dryer, a material transfer dryer, a material agitation dryer, a hot air transfer dryer, a cylindrical dryer, an infrared dryer, a freeze dryer, and a high frequency dryer. Can be used.
- the cumulative pore volume (range of pore radius of 0.01 ⁇ m or more and 1 ⁇ m or less) measured by mercury porosimetry is 0.6 mL / g or more.
- Aluminum hydroxide can be produced. And in the manufacturing method of the alumina which concerns on this invention, in baking process S11, this aluminum hydroxide is baked and an alumina baked body is obtained.
- the above-mentioned aluminum hydroxide is fired to produce an alumina fired body. That is, by calcining aluminum hydroxide, ⁇ -alumina that is a high-temperature stable phase can be produced via intermediate alumina ( ⁇ -alumina, ⁇ -alumina, ⁇ -alumina). Unlike the transition between the intermediate aluminas, the transition from the intermediate alumina to the ⁇ -alumina is a transition that requires rearrangement of oxygen filling, and therefore requires a high temperature.
- baking process S11 The thermal energy required in order to phase-transform aluminum hydroxide to an alumina is added.
- baking is performed at a temperature of 1200 ° C. or more for 2 hours or more.
- the aluminum hydroxide obtained in the above-described aluminum alkoxide generation step S21 and hydrolysis step S22 it is possible to prevent the occurrence of tightly bonded and difficult to grind alumina aggregates.
- pulverizing under the conditions of the pulverization process in the pulverization step S12 described later high-purity alumina with few aggregated particles can be obtained.
- the firing step S11 it is preferable to perform firing by applying thermal energy of 20000 to 35000 kcal to 1 kg of the aluminum hydroxide described above.
- thermal energy of 20000 to 35000 kcal it is preferable to perform firing by applying thermal energy of 20000 to 35000 kcal to 1 kg of the aluminum hydroxide described above.
- the above-mentioned “three-dimensional particle unevenness degree” is a shape parameter of one particle in the alumina fired body, and the particle volume V ( ⁇ m 3 ) and the volume La ⁇ Lb ⁇ Lc ( ⁇ m) of the cuboid circumscribing the particle. 3 ) is a value defined by the following formula (2).
- the “average three-dimensional particle unevenness degree” is an average value of the three-dimensional particle unevenness degree calculated by the following formula (2) for any 100 or more particles contained in the powder.
- Three-dimensional particle irregularity La ⁇ Lb ⁇ Lc / V (2)
- FIG. 1 is a schematic diagram for explaining the three-dimensional particle unevenness.
- the particle volume V, the particle long diameter La, the particle medium diameter Lb, and the particle short diameter Lc are obtained by analyzing a continuous slice image of the target particle with three-dimensional quantitative analysis software (for example, TRI / 3D-PRT manufactured by Rattok System Engineering). ) Can be obtained by analysis.
- a continuous slice image of particles is obtained by slicing an evaluation sample obtained by curing a particle fixing resin (epoxy resin or the like) in which a predetermined amount of an alumina fired body is dispersed at a predetermined interval by FIB processing, and a cross-sectional SEM image
- a particle fixing resin epoxy resin or the like
- a predetermined amount of an alumina fired body is dispersed at a predetermined interval by FIB processing
- a cross-sectional SEM image To obtain a predetermined number of cross-sectional SEM images, and then synthesize the obtained cross-sectional SEM images with an appropriate image analysis software (for example, Visualization Science Group, Aviso ver. 6.0).
- sample preparation method for continuous slice images determination method of V, La, Lb, and Lc by three-dimensional quantitative analysis software
- determination method of V, La, Lb, and Lc by three-dimensional quantitative analysis software is described in detail in the examples using alumina particles as an example. Describe.
- the upper limit of the average three-dimensional particle irregularity is preferably 10.0 or less, and more preferably 6.0 or less.
- it can be suitably used as a material for an inorganic oxide porous film of a lithium ion secondary battery, has good ion permeability, and has excellent heat resistance and insulation properties.
- An object porous membrane can be formed.
- the alumina fired body When the average three-dimensional particle unevenness is less than 3.0, the alumina fired body is slurried and applied to the surface of the electrode mixture layer containing an electrode active material (positive electrode active material or negative electrode active material) and a binder, The porosity of the inorganic oxide porous film obtained by drying decreases, and as a result, the amount of the electrolyte solution retained in the inorganic oxide porous film decreases, which is not preferable.
- the average three-dimensional particle irregularity exceeds 10.0, the alumina fired body is slurried and applied to the surface of an electrode (positive electrode or negative electrode) composed of an electrode mixture layer containing an electrode active material and a binder and dried.
- the porosity of the inorganic oxide porous film made of the obtained alumina fired body also increases, and the strength of the inorganic oxide porous film may decrease.
- the aluminum hydroxide 10 described above is first fired at a firing temperature of 100 ° C. or higher.
- moisture in the aluminum hydroxide 10 can be removed to obtain the alumina fired body 11.
- the alumina fired body 11 is fired at a firing temperature of 1000 ° C. or higher.
- the alumina fired body 12 in which the alumina fired bodies 11 are joined to each other by necking can be obtained.
- the alumina fired body 12 is fired by holding at a firing temperature of 1000 ° C. or higher for a certain time, more specifically, by holding at a firing temperature of 1230 to 1240 ° C. for 3.3 to 4.4 hours, for example. Baked with a thermal energy of 20000-35000 kcal.
- the joint part (neck part) 12A of the alumina fired bodies 12 spread like the joint part 13A, and the three-dimensional unevenness degree is 3.0 or more.
- a gourd-type alumina fired body 13 can be obtained. It should be noted that when the gourd-type alumina fired body having a three-dimensional unevenness degree of 3.0 or more is generated, the alumina fired body 12 may be fired by applying thermal energy in the above-described range. It is not limited to the firing temperature or holding time.
- the heating rate at which the temperature is raised to a predetermined firing temperature is not particularly limited, but is, for example, 30 to 500 ° C./hour.
- the baking treatment for the aluminum hydroxide can be performed using, for example, a baking furnace.
- a material stationary firing furnace for example, a tunnel kiln, a batch-type aeration flow type box firing furnace, a batch type parallel flow box firing furnace, or the like can be used.
- the firing atmosphere is not particularly limited, and may be any of an inert atmosphere such as nitrogen gas or argon gas, or a reducing atmosphere, in addition to an atmospheric atmosphere.
- the firing step S11 prior to the firing treatment, aluminum hydroxide is granulated, the granulated product is pre-dried, and the granulated product after the preliminary drying is filled in a firing vessel made of high-purity alumina and fired. By doing so, an alumina fired body may be produced.
- the firing container is not particularly limited, and for example, a sheath, a circular shape with a bottom, or a polygonal columnar sheath can be used.
- the firing container is preferably made of alumina ceramics. By using a firing container made of alumina ceramics, contamination of alumina during firing can be prevented, and high-purity alumina can be obtained.
- the alumina fired body obtained as described above is pulverized in the pulverization step S12.
- the alumina fired body obtained as described above is pulverized in the pulverization step S12.
- the airflow pulverizer is used to pulverize so that the speed when the alumina fired body passes through the pulverization chamber of the airflow pulverizer is 500 m / s or more. It is characterized by that. Thereby, the agglomerated particles generated with the firing can be easily pulverized, and alumina with few agglomerated particles can be obtained.
- a pulverizer with higher pulverization capability such as a vibration pulverizer
- contamination from the pulverization medium and reaggregation of the particles occur. It is not possible to obtain pure alumina. Further, the necking portion of the gourd-type alumina is broken, and it becomes impossible to obtain alumina having an average three-dimensional particle irregularity of 3.0 or more.
- the airflow type pulverizer used for the pulverization process uses high-pressure compressed air or steam jetted from a nozzle as an ultra-high-speed jet, puts alumina particles on them, moves them at high speed, collides the particles, and collides with each other. It can be pulverized into particles of 1 ⁇ m or less. Thereby, the aggregated particles formed at the time of baking can be easily dispersed, and the aggregated particles can be eliminated.
- an airflow pulverizer not only particles but also a collision effect with a collision plate (powder contact portion) provided in the pulverization chamber of the pulverizer can be expected. Can be crushed to eliminate coarse particles.
- the airflow type pulverizer used for the pulverization process is not particularly limited, but since there is a temperature drop due to adiabatic expansion of air, the pulverization conditions are adjusted by mutually adjusting the pressure of compressed air, the amount of air used, and the amount of powder supplied. It is preferable to use a jet mill that can be controlled.
- the supply rate of the alumina fired body that is a raw material supplied to the airflow pulverizer is preferably a constant supply in the range of 10 to 25 kg / hr.
- the supply rate is less than 10 kg / hr or more than 25 kg / hr, the supplied alumina fired body is not sufficiently pulverized, and the number of unpulverized products increases and aggregated particles may be generated.
- the method of supplying the raw material alumina fired body uniformly is not particularly limited, but it is preferable to supply a fixed quantity feeder and a sieving machine in combination. Coarse particles with a size of several mm or more contained in the powder not only take a long time for pulverization but also cause wear and breakage of the pulverizer, so it is efficient and preferable to remove them with a sieving machine .
- the compressed air pressure injected through the nozzle into the pulverization chamber of the airflow pulverizer is 0.6 to 0.9 MPa.
- the air volume in the airflow pulverizer is preferably 8 to 10 m 3 / min. Thereby, for example, when the necessary compressed air pressure is 0.6 to 0.9 MPa, a general-purpose industrial compressor can be used.
- the powder contact member (the member on which the alumina fired body collides) in the pulverization chamber of the airflow type pulverizer, or all the members in the pulverization chamber are formed of SUS or alumina ceramics. Is preferably used. Moreover, it is preferable to use what has the urethane lining which has abrasion resistance in the product discharge port piping of the lower part of an airflow type grinder. By doing in this way, the high purity alumina powder with few mixing of a foreign material can be obtained.
- aluminum alkoxide is generated by solid-liquid reaction between metal aluminum and alcohol, and aluminum alkoxide is hydrolyzed to produce aluminum hydroxide.
- the alumina hydroxide is fired to produce an alumina fired body, and the alumina fired body is pulverized at a speed of 500 m / s or more when the alumina fired body passes through the jet mill.
- alumina According to the method for producing alumina according to the present invention, it is possible to obtain high-purity alumina with few agglomerated particles and little foreign matter.
- alumina having an average particle diameter of 1 ⁇ m or less and an oxide purity of 90% by weight or more can be produced.
- the “average particle size” defined here means a particle size corresponding to a cumulative percentage of 50% on the mass basis obtained by a laser diffraction method.
- the “oxide purity” can be measured by solid-state emission spectroscopy, and can be calculated by subtracting the total weight of impurities contained in alumina from 100.
- this alumina has a content of aggregated alumina particles of 20 ⁇ m or more of 10 ppm or less. Further, the number of foreign matters other than alumina of 20 ⁇ m or more is 200 or less per 500 g of alumina.
- this alumina has a content of Si, Na, Ca, Fe, Cu, and Mg of 10 ppm or less, respectively. As described above, these impurities can be measured by emission spectroscopy.
- the alumina has a BET specific surface area of 1 to 10 m 2 / g.
- the BET specific surface area can be determined by a nitrogen adsorption method according to the method defined in JIS-Z-8830.
- ⁇ Cumulative pore volume, pore radius R, pore distribution curve of aluminum hydroxide> The material used for the measurement was dried at 120 ° C. for 4 hours with a dryer, and the weight after drying was precisely weighed to obtain the material weight.
- the sample after drying was set in a cell of a pore volume measuring device (Autopore III9420 manufactured by MICROMERITICS), the inside of the cell system was reduced to 50 ⁇ mHg or less, then filled with mercury, and then the cell was charged from 0.007 MPa.
- the pressure was gradually applied up to 414 MPa, and the mercury intrusion amount at each pressure was measured with the mercury intrusion waiting time of 10 seconds.
- the cumulative pore volume (mL / g) was determined by dividing the total mercury intrusion amount (mL) when the pressure was applied from 0.007 MPa to 414 MPa by the sample weight (g).
- the pore radius R ( ⁇ m) was calculated from the mercury intrusion amount at each pressure P based on the above-mentioned Washburn equation. Further, the horizontal axis represents the pore radius R ( ⁇ m) at each pressure P calculated based on the Washburn equation, and the vertical axis represents the mercury intrusion amount (dV / dlogR [mL / g]) at each pressure P.
- the pore distribution curve was obtained by plotting the results.
- ⁇ Bulk density> For light bulk density, put 9-10 mL of sample into a 10 mL graduated cylinder, measure the weight (g) of the sample, put the lid on the graduated cylinder, turn it upside down, put it back and let it fall gently The volume (cm 3 ) of the sample is measured. Inversion was repeated three times, the average volume (cm 3 ) was determined, and the value of sample weight ⁇ sample average volume was taken as the light bulk density (g / cm 3 ).
- the graduated cylinder containing the sample after the light bulk density measurement was naturally dropped 100 times onto a hard rubber board from a height of 3 cm, and the volume of the subsequent sample (cm 3 ) was measured.
- the value of sample weight ⁇ sample volume was defined as heavy bulk density (g / cm 3 ).
- ⁇ Average particle diameter, D90 particle diameter> Using a laser particle size distribution measuring apparatus (Microtrack manufactured by Nikkiso Co., Ltd.), the particle diameter equivalent to 50% of the cumulative percentage on the mass basis was the average particle diameter and the particle diameter equivalent to 90% of the cumulative percentage was D90 particle diameter. . In the measurement, ultrasonic dispersion was performed with a 0.2 wt% aqueous solution of sodium hexametaphosphate.
- ⁇ Alumina aggregate particle content of 20 ⁇ m or more> 200 g of alumina powder was gradually put into a 1000 mL tall beaker containing 750 mL of 0.4 wt% sodium hexametaphosphate aqueous solution, and then ultrasonic dispersion was performed for 5 minutes while stirring with a stirring rod.
- the obtained alumina slurry was poured onto a standard sieve having an opening of 20 ⁇ m, and the residue on the sieve was put in an evaporating dish, dried at 110 ° C., and the mass was weighed and divided by the sample amount.
- ⁇ Average three-dimensional particle unevenness> Disperse 2 parts by weight of dispersant and 2 parts by weight of alumina particle powder in 100 parts by weight of epoxy resin, vacuum degassed, and then add 12 parts by weight of curing agent. Pour the resulting alumina-dispersed epoxy resin into a silicon mold and cure. I let you. After fixing the cured sample to the sample stage, carbon deposition was performed, and it was set in FIB-SEM (HELI 600 made by FEI), FIB processed at an acceleration voltage of 30 kV to produce a cross section, and the cross section was observed by SEM at an acceleration voltage of 2 kV. .
- HELI 600 made by FEI
- FIB processing was performed at a thickness of 20 nm in the sample depth direction to create a new cross section, and the cross section was observed by SEM. As described above, FIB processing and cross-sectional SEM observation are repeated at intervals of 20 nm to acquire 100 or more images, and position correction is performed with image analysis software (Aviso ver. It was. The slices were 20 nm / pix on all three axes.
- the three-dimensional quantitative analysis of the alumina particles was performed on the obtained continuous slice image, and the three-dimensional particle unevenness degree was calculated.
- quantitative analysis software TRI / 3D-PRT manufactured by Ratok System Engineering
- a continuous slice image is first opened on the TRI / 3D-PRT, noise is removed by applying a median filter, and then each three-dimensionally isolated particle is identified and labeled. Particles interrupted around the measurement area were deleted.
- the degree of three-dimensional particle unevenness was calculated from “Lc / V”.
- the average three-dimensional particle unevenness degree was obtained as an average value of the particle unevenness degree of 100 or more particles obtained in this way.
- Example 1 Continuously in a loop reactor filled with a high purity metallic aluminum having a purity of 99.99% or more and isopropyl alcohol having a purity of 99.9% or more with an isopropyl alcohol solution containing at least 10% by weight of aluminum alkoxide. I put it in. Then, a mixed solution containing 100 parts by weight of aluminum alkoxide and 15 parts by weight of isopropyl alcohol was continuously extracted from the right side surface of the connected top of the head.
- This suspension was transferred to another reactor in which a stirring blade was inserted, and water and isopropyl alcohol contained in the suspension were removed while being heated, so that the cumulative pore volume (pore radius R was 0.1).
- An aluminum hydroxide having a range of 01 to 1 ⁇ m was 1.77 mL / g, a light bulk density was 0.14 g / cm 3 , and a heavy bulk density was 0.17 g / cm 3 .
- the aluminum hydroxide was fired at a maximum temperature of 1230 ° C. for 4 hours in a continuous firing furnace to obtain an alumina fired body.
- the thermal energy given to the aluminum hydroxide in the firing process was 24238 kcal / kg.
- the alumina fired body was pulverized simply using a vibration sieving machine, and then supplied to a jet mill pulverizer (horizontal jet mill pulverizer PJM-380SP manufactured by Nippon Pneumatic Industry Co., Ltd.) at a supply rate of 15 kg / hr. Feed and grind.
- Alumina members were used in the contact parts such as the inside of the pulverizer and the air supply port.
- the jet mill pulverizer outlet partial piping was urethane-lined.
- the gauge pressure at the air supply port at the time of pulverization was 0.65 MPa, and the wind speed in the pulverizer was calculated using the Mach number at the outlet of the jet nozzle and found to be 662 m / s.
- the BET specific surface area was 4.6 m 2 / g, and the average three-dimensional particle unevenness of 128 particles was 3.7.
- Example 2 The alumina fired body obtained by the method described in Example 1 was pulverized by the same method. Since the gauge pressure before the air supply port was 0.8 MPa, the wind speed in the pulverizer was 742 m / s.
- the average particle diameter of the obtained alumina powder was 0.75 ⁇ m, and D90 was 2.05 ⁇ m.
- the content of aggregated alumina particles of 20 ⁇ m or more was 2 ppm, and the number of foreign substances other than alumina was 98.
- the BET specific surface area was 4.6 m 2 / g.
- Example 1 The aluminum hydroxide obtained by the method described in Example 1 was re-humidified and dried, so that the cumulative pore volume with a pore radius R in the range of 0.01 to 1 ⁇ m was 0.21 mL / g, and the light bulk density was 0.72 g / cm 3, tamped density was obtained aluminum hydroxide 0.91 g / cm 3.
- This aluminum hydroxide was fired under the conditions described in Example 1 and pulverized to obtain an alumina powder.
- the average particle size of the obtained alumina powder was 0.85 ⁇ m, and D90 was 2.58 ⁇ m.
- the content of aggregated alumina particles of 20 ⁇ m or more was 1023 ppm.
- the BET specific surface area was 4.3 m 2 / g.
- Example 2 The alumina fired body obtained by the method described in Example 1 was pulverized at a gauge pressure of 0.3 MPa before the air supply port. The wind speed in the pulverizer was 413 m / s.
- the average particle diameter of the obtained alumina powder was 0.72 ⁇ m, and D90 was 2.26 ⁇ m.
- the BET specific surface area was 4.6 m 2 / g.
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Abstract
Description
(1)アルミニウムアルコキサイドを加水分解することにより得られ、水銀圧入法により測定される累積細孔容積(細孔半径が0.01μm以上1μm以下の範囲)が0.6mL/g以上の水酸化アルミニウムを焼成し、アルミナ焼成体を生成する焼成工程と、上記アルミナ焼成体を気流式粉砕機を用いて、該気流式粉砕機の粉砕室内を通過するときの速度を500m/s以上として粉砕する粉砕工程とを有するアルミナの製造方法。
先ず、本発明に係るアルミナの製造方法は、アルミニウムアルコキサイドを加水分解することによって得られ、その累積細孔容積(細孔半径が0.01μm以上1μm以下の範囲)が0.6mL/g以上の水酸化アルミニウムを用いて焼成することを特徴としている。
上述のように、本発明に係るアルミナの製造方法では、アルミニウムアルコキサイドを加水分解することによって得られ、その累積細孔容積(細孔半径が0.01μm以上1μm以下の範囲)が0.6mL/g以上の水酸化アルミニウムを用いる。水酸化アルミニウムの累積細孔容積が0.6mL/gより小さい場合には、凝集粒子の少ない高純度のアルミナを製造することができない。また、保形性が不十分となるため、成形や造粒が困難となり、不純物が混入してしまう可能性が生じるとともに製造効率が著しく悪化する。
Washburnの式 :細孔半径R(m)=-2γcosθ/P
P:圧力(Pa)
γ:水銀の表面張力(482×10-3N/m)
θ:水銀の接触角(140deg)
ここで、上述した水酸化アルミニウムは、以下に示すアルミニウムアルコキサイドの加水分解により製造することができる。すなわち、水酸化アルミニウムの製造方法は、アルミニウムアルコキサイド生成工程S21と、加水分解工程S22とを有する。
アルミニウムアルコキサイド生成工程S21においては、下記(1)式に示すように、金属アルミニウム(Al)とアルコール(ROH)との固液反応によりアルミニウムアルコキサイド(Al(OR)3)を生成する。
Al+3ROH→Al(OR)3+3/2H2 (1)
加水分解工程S22においては、アルミニウムアルコキサイド生成工程S21で生成したアルミニウムアルコキサイドを加水分解して水酸化アルミニウムを生成する。加水分解により生成する水酸化アルミニウムは、加水分解の条件にもよるが、通常、粒径が数十nmの超微細粒子である。
より具体的に、先ず、第1の加水分解工程S31においては、所定濃度の水を含有するアルコール溶液を用いて、アルミニウムアルコキサイドを加水分解する。
次に、第2の加水分解工程S32においては、第1の加水分解処理後の混合液からアルコールを分離した混合物に対して、さらに水を加えて、アルミニウムアルコキサイドの全量に対する加水分解処理を行う。
以上のように、アルミニウムアルコキサイドを加水分解することによって、水銀圧入法により測定される累積細孔容積(細孔半径が0.01μm以上1μm以下の範囲)が0.6mL/g以上である水酸化アルミニウムを製造することができる。そして、本発明に係るアルミナの製造方法では、焼成工程S11において、この水酸化アルミニウムを焼成して、アルミナ焼成体を得る。
3次元粒子凹凸度=La×Lb×Lc/V ・・・・・(2)
次に、本発明に係るアルミナの製造方法では、粉砕工程S12において、上述のようにして得られたアルミナ焼成体を粉砕する。このようにアルミナ焼成体を粉砕することによって、粒子径が小さく粒度分布のシャープな単分散で、凝集粒子の少ない、高純度のアルミナ粉末を得ることができる。
測定に供する資料を乾燥機にて120℃で4時間乾燥し、乾燥後の重量を精秤して資料重量とした。乾燥後の試料を、細孔容積測定装置(MICROMERITICS社製 オートポアIII9420)のセル内にセットし、セル系内を50μmHg以下にした後、水銀を系内に満たし、次いで、セルに0.007MPaから414MPaまで段階的に圧力を加えていき、水銀の圧入平衡待ち時間を10秒として各圧力における水銀圧入量を測定した。
軽装かさ密度は、10mLのメスシリンダーに9~10mLの試料を投入し、試料の重量(g)を測定し、メスシリンダーに蓋をして逆さにし、元に戻して静かに自由落下させたときの試料の容積(cm3)を測定する。逆さにして戻すことを3回繰り返し、平均の容積(cm3)を求め、試料重量÷試料平均容積の値を軽装かさ密度(g/cm3)とした。
Si、Na、Ca、Fe、Cu、及びMgの含有量を、発光分光法(THERMO Jarrell Ash CID-DCA AURORA)にて測定した。
レーザー粒度分布測定装置(日機装(株)製 マイクロトラック)を用いてレーザー回折法により、質量基準で累積百分率50%相当粒子径を平均粒子径、累積百分率90%相当粒子径をD90粒子径とした。測定に際しては、0.2重量%のヘキサメタリン酸ナトリウム水溶液で超音波分散した。
0.4重量%ヘキサメタリン酸ナトリウム水溶液750mLを入れた1000mLトールビーカーに、アルミナ粉末200gを徐々に入れた後、撹拌棒で撹拌しながら超音波分散を5分間行った。得られたアルミナスラリーを、目開き20μmの標準篩の上に流し込み、篩上残渣は蒸発皿に入れ、110℃で乾燥後、その質量を秤り試料量で除して算出した。
0.2重量%ヘキサメタリン酸ナトリウム水溶液4000mLを入れたポリビーカーに、アルミナ粉末500gを徐々に入れた後、超音波分散を20分間行った。得られたアルミナスラリーを、20μmの網目を有するろ紙でろ過した後、光学顕微鏡を用いて有色異物の個数を数えた。
JIS-Z-8830に規定された方法に従って、窒素吸着法により求めた。なお、比表面積測定装置としては、島津製作所社製の「フロソーブII 2300」を使用した。
エポキシ樹脂100重量部に、分散剤2重量部とアルミナ粒子粉末2重量部を分散させ、真空脱気した後、硬化剤12重量部を入れ、得られたアルミナ分散エポキシ樹脂をシリコン型に流し込み硬化させた。硬化後の試料を試料台に固定後、カーボン蒸着し、FIB-SEM(FEI製 HELIOS600)にセットし、加速電圧30kVでFIB加工して断面を作製し、その断面を加速電圧2kVでSEM観察した。観察後、試料奥行き方向に20nmの厚さでFIB加工して新しく断面を作製し、その断面をSEM観察した。このように20nm間隔でFIB加工、断面SEM観察を繰り返して100枚以上の像を取得し、画像解析ソフト(Visualization Sciences Group製 Avizo ver.6.0)で位置補正を行い、連続スライス像を得た。スライスは3軸ともに20nm/pixとした。
純度99.99%以上の高純度金属アルミニウムと純度99.9%以上のイソプロピルアルコールとを、アルミニウムアルコキサイドを少なくとも10重量%以上含むイソプロピルアルコール溶液で満たされたループ式反応器に連続的に投入した。そして、アルミニウムアルコキサイドが100重量部とイソプロピルアルコールが15重量部含む混合溶液を、接続された頭頂部の右側面から連続的に抜き出した。
Ma=(2[1-(Pe/Po)^K-1/K]/(K-1)×(Pe/Po)^K-1/K)^1/2
Ma;ジェットノズル出口のマッハ数=340m/s
Pe:ジェットノズル入口絶対圧力
Po:ジェットノズル出口絶対圧力
K:断熱指数
(出典:粉体と工業 VOL.19, No.9 (1987) p.72)
実施例1の記載の方法で得られたアルミナ焼成体を同様の方法で粉砕した。エアー供給口前のゲージ圧力は、0.8MPaであったことから、粉砕機内の風速は742m/sであった。
実施例1の記載の方法で得られた水酸化アルミニウムを再度加湿、乾燥させて、細孔半径Rが0.01~1μmの範囲の累積細孔容積が0.21mL/g、軽装かさ密度が0.72g/cm3、重装かさ密度が0.91g/cm3の水酸化アルミニウムを得た。
実施例1の記載の方法で得られたアルミナ焼成体を、エアー供給口前のゲージ圧力は、0.3MPaで粉砕した。粉砕機内の風速は413m/sであった。
Claims (6)
- アルミニウムアルコキサイドを加水分解することにより得られ、水銀圧入法により測定される累積細孔容積(細孔半径が0.01μm以上1μm以下の範囲)が0.6mL/g以上の水酸化アルミニウムを焼成し、アルミナ焼成体を生成する焼成工程と、
上記アルミナ焼成体を気流式粉砕機を用いて、該気流式粉砕機の粉砕室内を通過するときの速度を500m/s以上として粉砕する粉砕工程と
を有するアルミナの製造方法。 - 上記水酸化アルミニウムは、軽装かさ密度が0.10~0.25g/cm3であり、重装かさ密度が0.15~0.30g/cm3である請求項1記載のアルミナの製造方法。
- 上記水酸化アルミニウムは、
金属アルミニウムとアルコールとの固液反応により得られたアルミニウムアルコキサイドを含む溶液に、水濃度が5~30重量%であるアルコール溶液を、水に対するアルミニウムアルコキサイドのモル比が1.5~2.0となるように添加して加水分解する第1の加水分解工程と、
上記第1の加水分解工程後の混合液からアルコールを分離回収した後、水を用いて、アルミニウムアルコキサイドに対する水のモル比が1.0~7.0となるように添加して加水分解する第2の加水分解工程と
を含む水酸化アルミニウム生成工程により得られる請求項1記載のアルミナの製造方法。 - 上記アルミニウムアルコキサイドが、アルミニウムイソプロポキサイドである請求項3記載のアルミナの製造方法。
- 上記焼成工程では、上記水酸化アルミニウムに対して20000~35000kcalの熱エネルギーを負荷して焼成する請求項1記載のアルミナの製造方法。
- 上記気流式粉砕機の粉砕室は、旋回する上記アルミナ焼成体の粒子が衝突する粉接部を備え、該粉接部がSUS又はアルミナセラミックスで形成されている請求項1記載のアルミナの製造方法。
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| PCT/JP2012/059775 WO2013153618A1 (ja) | 2012-04-10 | 2012-04-10 | アルミナの製造方法 |
| EP12873935.6A EP2837598B1 (en) | 2012-04-10 | 2012-04-10 | Method for producing alumina |
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| JP2014169208A (ja) * | 2013-03-04 | 2014-09-18 | Sumitomo Chemical Co Ltd | 水酸化アルミニウム粉末 |
| WO2016098579A1 (ja) * | 2014-12-17 | 2016-06-23 | 住友化学株式会社 | 無機酸化物粉末、およびこれを含有するスラリー、ならびに非水電解液二次電池およびその製造方法 |
| WO2016204248A1 (ja) * | 2015-06-18 | 2016-12-22 | 住友化学株式会社 | 研磨砥粒、研磨スラリーおよび硬脆材の研磨方法、ならびに硬脆材の製造方法 |
| JP2019145306A (ja) * | 2018-02-20 | 2019-08-29 | トヨタ自動車株式会社 | 非水電解質二次電池 |
| CN113149046A (zh) * | 2021-04-28 | 2021-07-23 | 中铝山东有限公司 | 一种高纯超细氧化铝的制备方法 |
| US20230331572A1 (en) * | 2020-09-29 | 2023-10-19 | Denka Company Limited | Spherical alumina powder, resin composition, and heat dissipation material |
| CN118005057A (zh) * | 2024-02-02 | 2024-05-10 | 山东中临半导体新材料有限公司 | 一种用于氧化铝生产的煅烧加工装置及方法 |
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| CN111205070A (zh) * | 2020-03-11 | 2020-05-29 | 苏州贝尔德新材料科技有限公司 | 一种易烧结高纯氧化铝的制备方法 |
| CN116081666B (zh) * | 2022-12-12 | 2024-08-13 | 芯科众联新材料(常州)有限公司 | 适用于电池隔膜涂覆的多孔氧化铝粉体及其制备方法 |
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| JP2014169208A (ja) * | 2013-03-04 | 2014-09-18 | Sumitomo Chemical Co Ltd | 水酸化アルミニウム粉末 |
| US10014502B2 (en) | 2014-12-17 | 2018-07-03 | Sumitomo Chemical Company, Limited | Inorganic oxide powder, slurry containing same, nonaqueous electrolyte secondary battery, and method for manufacturing nonaqueous electrolyte secondary battery |
| JPWO2016098579A1 (ja) * | 2014-12-17 | 2017-04-27 | 住友化学株式会社 | 無機酸化物粉末、およびこれを含有するスラリー、ならびに非水電解液二次電池およびその製造方法 |
| KR101749883B1 (ko) | 2014-12-17 | 2017-06-21 | 스미또모 가가꾸 가부시끼가이샤 | 무기 산화물 분말, 및 이것을 함유하는 슬러리, 그리고 비수 전해액 이차 전지 및 그 제조 방법 |
| WO2016098579A1 (ja) * | 2014-12-17 | 2016-06-23 | 住友化学株式会社 | 無機酸化物粉末、およびこれを含有するスラリー、ならびに非水電解液二次電池およびその製造方法 |
| CN108807823A (zh) * | 2014-12-17 | 2018-11-13 | 住友化学株式会社 | 无机氧化物粉末、和含有其的浆料、以及非水电解液二次电池和其制造方法 |
| CN108807823B (zh) * | 2014-12-17 | 2021-05-04 | 住友化学株式会社 | 无机氧化物粉末、和含有其的浆料、以及非水电解液二次电池和其制造方法 |
| WO2016204248A1 (ja) * | 2015-06-18 | 2016-12-22 | 住友化学株式会社 | 研磨砥粒、研磨スラリーおよび硬脆材の研磨方法、ならびに硬脆材の製造方法 |
| JPWO2016204248A1 (ja) * | 2015-06-18 | 2018-05-24 | 住友化学株式会社 | 研磨砥粒、研磨スラリーおよび硬脆材の研磨方法、ならびに硬脆材の製造方法 |
| JP2019145306A (ja) * | 2018-02-20 | 2019-08-29 | トヨタ自動車株式会社 | 非水電解質二次電池 |
| US20230331572A1 (en) * | 2020-09-29 | 2023-10-19 | Denka Company Limited | Spherical alumina powder, resin composition, and heat dissipation material |
| CN113149046A (zh) * | 2021-04-28 | 2021-07-23 | 中铝山东有限公司 | 一种高纯超细氧化铝的制备方法 |
| CN118005057A (zh) * | 2024-02-02 | 2024-05-10 | 山东中临半导体新材料有限公司 | 一种用于氧化铝生产的煅烧加工装置及方法 |
| CN118005057B (zh) * | 2024-02-02 | 2024-07-19 | 山东中临半导体新材料有限公司 | 一种用于氧化铝生产的煅烧加工装置及方法 |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2837598A4 (en) | 2015-12-23 |
| CN104220373A (zh) | 2014-12-17 |
| JP5759065B2 (ja) | 2015-08-05 |
| KR20140143435A (ko) | 2014-12-16 |
| JPWO2013153618A1 (ja) | 2015-12-17 |
| EP2837598A1 (en) | 2015-02-18 |
| CN104220373B (zh) | 2016-12-14 |
| EP2837598B1 (en) | 2018-06-20 |
| KR101593357B1 (ko) | 2016-02-11 |
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