CN114477800A - Preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by one-step method - Google Patents
Preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by one-step method Download PDFInfo
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- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 title claims abstract description 300
- 239000000395 magnesium oxide Substances 0.000 title claims abstract description 152
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- 238000003723 Smelting Methods 0.000 claims abstract description 64
- 239000013078 crystal Substances 0.000 claims abstract description 40
- 239000001095 magnesium carbonate Substances 0.000 claims abstract description 22
- 235000014380 magnesium carbonate Nutrition 0.000 claims abstract description 22
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 claims abstract description 22
- 229910000021 magnesium carbonate Inorganic materials 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 16
- 238000004321 preservation Methods 0.000 claims abstract description 16
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011777 magnesium Substances 0.000 claims abstract description 15
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 15
- 239000002994 raw material Substances 0.000 claims abstract description 13
- 238000012216 screening Methods 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000010891 electric arc Methods 0.000 claims abstract description 7
- 238000002425 crystallisation Methods 0.000 claims abstract description 6
- 230000008025 crystallization Effects 0.000 claims abstract description 6
- 238000000227 grinding Methods 0.000 claims abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 13
- 239000002006 petroleum coke Substances 0.000 claims description 10
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 8
- 239000000428 dust Substances 0.000 claims description 8
- 239000006184 cosolvent Substances 0.000 claims description 6
- 229910001404 rare earth metal oxide Inorganic materials 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- MRELNEQAGSRDBK-UHFFFAOYSA-N lanthanum(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[La+3].[La+3] MRELNEQAGSRDBK-UHFFFAOYSA-N 0.000 claims description 4
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims description 4
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 4
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 229910000420 cerium oxide Inorganic materials 0.000 claims description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 2
- 235000010755 mineral Nutrition 0.000 claims description 2
- 239000011707 mineral Substances 0.000 claims description 2
- BMMGVYCKOGBVEV-UHFFFAOYSA-N oxo(oxoceriooxy)cerium Chemical compound [Ce]=O.O=[Ce]=O BMMGVYCKOGBVEV-UHFFFAOYSA-N 0.000 claims description 2
- 229910001954 samarium oxide Inorganic materials 0.000 claims description 2
- 229940075630 samarium oxide Drugs 0.000 claims description 2
- FKTOIHSPIPYAPE-UHFFFAOYSA-N samarium(iii) oxide Chemical compound [O-2].[O-2].[O-2].[Sm+3].[Sm+3] FKTOIHSPIPYAPE-UHFFFAOYSA-N 0.000 claims description 2
- 238000009827 uniform distribution Methods 0.000 claims description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims 1
- 238000005265 energy consumption Methods 0.000 abstract description 8
- 229910000831 Steel Inorganic materials 0.000 abstract description 3
- 239000010959 steel Substances 0.000 abstract description 3
- 238000005272 metallurgy Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 6
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000010583 slow cooling Methods 0.000 description 3
- 239000011593 sulfur Substances 0.000 description 3
- 229910052717 sulfur Inorganic materials 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
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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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/102—Preheating, burning calcining or cooling of magnesia, e.g. dead burning
-
- 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
- C04B2/00—Lime, magnesia or dolomite
- C04B2/10—Preheating, burning calcining or cooling
- C04B2/12—Preheating, burning calcining or cooling in shaft or vertical furnaces
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
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- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
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- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
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Abstract
The invention relates to the technical field of fused magnesia production, in particular to a preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method. Selecting magnesite ore with the magnesia content of more than 45 wt% and the granularity of 30-80 mm after grinding as a raw material; smelting in an electric arc furnace: adding the magnesite raw material into a closed double-body electro-fused magnesium smelting furnace, and continuously electrifying and smelting at 3000-3500 ℃ for 7-10 hours; after smelting is finished, a hot air circulation temperature control system of the closed type double-body electro-fused magnesia smelting furnace is started to perform heat preservation, cooling, crystallization, graded crushing and screening to obtain large-crystal electro-fused magnesia, electro-fused magnesia and light-burned magnesia. The invention greatly saves energy consumption and operation cost, and the obtained macrocrystalline fused magnesia has the magnesia content of more than 98.5 wt% and the crystal lattice size of more than 5000 mu m; more than 98 percent of fused magnesia and more than 500 microns of lattice size; the ignition loss of the light-burned magnesia is less than 20 percent, and different product specifications can be widely applied to different fields of spaceflight, electronics, steel, metallurgy and the like.
Description
Technical Field
The invention relates to the technical field of fused magnesia production, in particular to a preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method.
Background
The large-crystal fused magnesia belongs to high-end products in the field of refractory materials, the high-temperature fire resistance and corrosion resistance are the best, the traditional production process is a two-step method for producing the large-crystal fused magnesia, namely, the first step directly adopts natural magnesite ore raw materials to produce light-burned magnesia powder, then the light-burned magnesia powder is subjected to crushing and screening to produce the large-crystal fused magnesia by smelting in an electric arc furnace, and the smelting method has the main defects that: (1) the two-step production process is complex, secondary energy consumption exists, the two-step processing is carried out, energy consumption waste is serious, and the operation cost is high. (2) The electric arc furnace for producing large-crystal fused magnesia by the traditional two methods adopts a single furnace design, only the current is continuously increased, the capacitance temperature time is prolonged, the heat preservation time is prolonged, the electric energy waste is serious, and the energy consumption is large.
The traditional large-crystal fused magnesia production equipment adopts an open single furnace, can only produce one product, can produce carbon dioxide and dust to pollute the environment after long-time smelting, is easy to cause the phenomenon of furnace spraying and decoration due to improper operation, and is easy to cause safety accidents.
Disclosure of Invention
The invention aims to solve the problem of providing a preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light burned magnesia (three products in one furnace) by a one-step method, and mainly solves the defects of high energy consumption, high pollution, complex process and the like of macrocrystalline fused magnesia produced by a traditional two-step method.
In order to achieve the purpose, the invention adopts the following technical scheme:
a preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by one-step method utilizes a closed two-body fused magnesia smelting furnace and combines a large-crystal fused magnesia production process to simultaneously produce common fused magnesia and light-burned magnesia; the closed double-body electro-fused magnesium smelting furnace has the following structure: the furnace body is a double-body furnace heat-preserving shell and a double-body furnace grid liner combined structure, the double-body furnace grid liner is positioned on the inner side of the double-body furnace heat-preserving shell and is coaxial with the double-body furnace heat-preserving shell, a heat-preserving and heat-insulating cavity is formed between the double-body furnace grid liner and the double-body furnace heat-preserving shell, an electric smelting magnesium melting chamber is arranged in an inner cavity of the double-body furnace grid liner, a closed furnace cover is installed at the top of the double-body furnace heat-preserving shell, an electrode port and an exhaust, dust collection and discharge port are formed in the closed furnace cover, the electrode port and the exhaust, dust collection and discharge port are communicated with the inner cavity of the double-body furnace grid liner, and a hot air circulation temperature control system is installed on the outer side of the double-body furnace heat-preserving shell.
The preparation method for producing macrocrystalline fused magnesia and co-producing the fused magnesia and the light burned magnesia by the one-step method comprises the steps of magnesite ore raw material preparation and totally-enclosed magnesium double-body fused magnesia electric arc furnace smelting, and specifically comprises the following operation steps:
(1) selecting magnesite ore with the magnesia content of more than 45 wt% and the granularity of 30-80 mm after grinding as a raw material;
(2) smelting in an electric arc furnace: adding the magnesite raw material into a closed double-body electro-fused magnesium smelting furnace, and continuously electrifying and smelting at 3000-3500 ℃ for 7-10 hours; after smelting is finished, a hot air circulation temperature control system of the closed type double-body electro-fused magnesia smelting furnace is started to perform heat preservation, cooling, crystallization, graded crushing and screening to obtain large-crystal electro-fused magnesia, electro-fused magnesia and light-burned magnesia.
According to the preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method, during the smelting period, a heat circulation system in a closed double-body fused magnesia smelting furnace continuously works, and the heat circulation gradient utilization is ensured.
The preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by the one-step method comprises the following steps of (1) layering and uniformly distributing materials in a closed double-body fused magnesia smelting furnace in a smelting process: one or more than two of petroleum coke powder, cosolvent and rare earth oxide, wherein the addition amount of the petroleum coke powder is 2-10 wt% of the weight of the magnesite, the addition amount of the cosolvent is 0.1-3 wt% of the weight of the magnesite, and the addition amount of the rare earth oxide is 0.01-1 wt% of the weight of the magnesite.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method adopts petroleum coke powder as a heating agent, a melting aid and a reducing agent for layering and uniform distribution.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method has the advantages that the cosolvent is one or more than two of sodium carbonate, calcium fluoride and aluminum oxide which are uniformly distributed in a layered mode.
The preparation method for producing large-crystal fused magnesia and co-producing the fused magnesia and the light-burned magnesia by the one-step method is characterized in that the rare earth oxide is one or more than two of yttrium oxide, cerium oxide, samarium oxide and lanthanum oxide which are uniformly distributed in a layered manner.
The preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia by the one-step method comprises the steps of carrying out intelligent temperature control on mineral aggregates in a closed double-body fused magnesia smelting furnace by adopting a hot air circulation temperature control system, slowly preserving heat and cooling, carrying out graded crushing and screening after cooling for 7-12 days to room temperature.
The invention has the following advantages and beneficial effects:
1. the large-crystal fused magnesia smelting equipment adopts a closed twin-body furnace design, and a hot air circulation temperature control system is arranged on an outer furnace shell, so that the large-crystal fused magnesia smelting equipment has the functions of automatically controlling heat preservation, cooling, uniform heating, forced heat extraction, energy cascade utilization and coproduction of common fused magnesia, light burned magnesia powder and the like.
2. The invention adopts petroleum coke powder as a heating assistant and a reducing agent, can improve the smelting temperature, reduce the power consumption and improve the purity of the large-crystal fused magnesia.
3. The invention directly adopts magnesite ore with the granularity of 30 mm-80 mm as raw material to produce large-crystal fused magnesia by one step, co-produce common fused magnesia and light-burned magnesia powder, greatly reduces energy consumption, reduces operation cost and improves market competitiveness of products.
4. The inner container of the closed double-body furnace is designed to adopt a grid structure, so that the outer overflow of radiant heat is facilitated, and the double-circulation echelon utilization function of heat energy is realized.
5. The invention improves the output and quality of products with different specifications by layering distribution, greatly saves energy consumption and operation cost, and obtains the following components: the magnesia content in the large-crystal electric melting magnesia is more than 98.5wt percent, and the crystal lattice size is more than 5000 mu m; the content of magnesium oxide in the fused magnesia is more than 98 percent, and the size of crystal lattice is more than 500 micrometers; the ignition loss of the light-burned magnesia is less than 20 percent.
Drawings
In order to more clearly illustrate the embodiments of the present invention, the following briefly describes the embodiments and the drawings that need to be used in the description of the prior art.
FIG. 1 is a schematic view of a sealed two-body electrofused magnesium melting furnace according to the present invention.
The reference numbers in fig. 1 denote: 1 electrode port; 2, an exhaust, dust collection and feed opening; 3, closing the furnace cover; 4, a double-body furnace grid inner container; 5, a hot air circulation temperature control system; 6 double-body furnace heat preservation shell.
Detailed Description
As shown in figure 1, the closed type double-body electric smelting magnesium smelting furnace has a furnace body of a combined structure of a double-body furnace heat preservation shell 6 and a double-body furnace grid liner 4, wherein the double-body furnace grid liner 4 is positioned on the inner side of the double-body furnace heat preservation shell 6 and is coaxial with the double-body furnace heat preservation shell 6, a heat preservation and heat insulation cavity is formed between the double-body furnace grid liner 4 and the double-body furnace heat preservation shell 6, an inner cavity of the double-body furnace grid liner 4 is an electric smelting magnesium smelting chamber, a closed furnace cover 3 is installed at the top of the double-body furnace heat preservation shell 6, an electrode port 1 and an exhaust, dust collection and feed port 2 are formed in the closed furnace cover 3, and the electrode port 1 and the exhaust, dust collection and feed port 2 are communicated with the inner cavity of the double-body furnace grid liner 4. And a hot air circulation temperature control system 5 is arranged on the outer side of the double-body furnace heat preservation shell 6.
The double-body furnace heat-insulating shell 6 is formed by compounding refractory heat-insulating bricks and steel plates, and the hot air circulation temperature control system 5 is additionally arranged, so that the double-body furnace heat-insulating shell has the functions of preventing heat energy from being dissipated, forcibly taking heat, utilizing waste heat in a gradient manner and the like. The grid liner 4 of the double-body furnace is designed to adopt a grid structure, so that the radiant heat can overflow outwards, the double-body furnace has a heat energy double-circulation echelon utilization function, and the furnace temperature can be effectively controlled.
The technical solution of the present invention is further illustrated by the following examples:
example 1
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
selecting magnesite with the specification of M47C (magnesium oxide 47 wt%) and the granularity of 30-80 mm as a raw material, placing 30 tons (T) of the magnesite into a grid inner container 4 of the double-body furnace shown in figure 1, and continuously electrifying for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1 wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T. During the smelting period, a heat circulation system in the closed double-body electro-fused magnesium smelting furnace continuously works to ensure the heat circulation gradient utilization. After the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the lattice size of the macrocrystalline fused magnesia is 5800 mu m, and the lattice size of the fused magnesia is 560 mu m.
Example 2
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
selecting magnesite with the specification of M46C (magnesium oxide 46 wt%) and the granularity of 30 mm-80 mm as a raw material 30T, placing the magnesite in a grid inner container 4 of a double-body furnace shown in the figure 1, and continuously electrifying for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1 wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T.
In the smelting process, sodium carbonate is uniformly distributed in layers for 0.1T.
In the smelting process, 0.01T of yttrium oxide is uniformly distributed in a layered mode.
During the smelting period, a heat circulation system in the closed double-body electric smelting magnesium smelting furnace continuously works to ensure the heat circulation gradient utilization; after the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the lattice size of the large-crystal fused magnesia is 5400 mu m, and the lattice size of the fused magnesia is 520 mu m.
Example 3
In this embodiment, the preparation method for producing macrocrystalline fused magnesia with co-production of fused magnesia and light-burned magnesia by one-step method is as follows:
selecting magnesite with the specification of M45 (magnesium oxide 45 wt%) and the granularity of 30-80 mm as a raw material 30T, placing the magnesite in a grid inner container 4 of a double-body furnace shown in figure 1, and continuously electrifying for 8 hours at 3200 ℃.
In the smelting process, high-purity petroleum coke powder (with the sulfur content less than 0.1 wt% and the carbon content more than 99 wt%) is uniformly distributed in layers and fully combusted at 1T.
In the smelting process, sodium carbonate is uniformly distributed in layers for 0.1T.
In the smelting process, 0.01T of yttrium oxide is uniformly distributed in a layered mode.
In the smelting process, calcium fluoride is uniformly distributed in layers by 0.05T.
During the smelting period, a heat circulation system in the closed double-body electric smelting magnesium smelting furnace continuously works to ensure the heat circulation gradient utilization; after the smelting is finished, the hot air circulation temperature control system 5 of fig. 1 is started to perform heat preservation and slow cooling crystallization for 9 days to room temperature, and then the large-crystal fused magnesia, the fused magnesia and the light-burned magnesia are obtained through grading crushing and screening. Wherein: the size of the crystal lattice of the large-crystal fused magnesia is 6100 μm, and the size of the crystal lattice of the fused magnesia is 630 μm.
The samples of the above examples were taken for component detection, and the statistics of the detection results are as follows:
the embodiment results show that the invention utilizes a closed double-body fused magnesia smelting furnace, combines a large-crystal fused magnesia production process, and simultaneously produces common fused magnesia and light-burned magnesia, thereby achieving the purpose of gradient utilization of energy, greatly reducing energy consumption, reducing operation cost, improving product quality, and being widely applied to different fields of aerospace, electronics, steel, metallurgy and the like in different product specifications.
Claims (8)
1. A preparation method for producing macrocrystalline fused magnesia and co-producing fused magnesia and light-burned magnesia by a one-step method is characterized in that a closed two-body fused magnesia smelting furnace is combined with a macrocrystalline fused magnesia production process to simultaneously produce common fused magnesia and light-burned magnesia; the closed double-body electro-fused magnesium smelting furnace has the following structure: the furnace body is a double-body furnace heat-preserving shell and a double-body furnace grid liner combined structure, the double-body furnace grid liner is positioned on the inner side of the double-body furnace heat-preserving shell and is coaxial with the double-body furnace heat-preserving shell, a heat-preserving and heat-insulating cavity is formed between the double-body furnace grid liner and the double-body furnace heat-preserving shell, an electric smelting magnesium melting chamber is arranged in an inner cavity of the double-body furnace grid liner, a closed furnace cover is installed at the top of the double-body furnace heat-preserving shell, an electrode port and an exhaust, dust collection and discharge port are formed in the closed furnace cover, the electrode port and the exhaust, dust collection and discharge port are communicated with the inner cavity of the double-body furnace grid liner, and a hot air circulation temperature control system is installed on the outer side of the double-body furnace heat-preserving shell.
2. The preparation method for producing macrocrystalline fused magnesia with coproduction of fused magnesia and light-burned magnesia by the one-step method according to claim 1, is characterized by comprising magnesite raw material preparation and totally-enclosed magnesium double-body fused magnesia electric arc furnace smelting, and comprises the following specific operation steps:
(1) selecting magnesite ore with the magnesia content of more than 45 wt% and the granularity of 30-80 mm after grinding as a raw material;
(2) smelting in an electric arc furnace: adding the magnesite ore raw material into a closed double-body electric smelting magnesium smelting furnace, and continuously electrifying and smelting at 3000-3500 ℃ for 7-10 hours; after smelting is finished, a hot air circulation temperature control system of the closed type double-body electro-fused magnesia smelting furnace is started to perform heat preservation, cooling, crystallization, graded crushing and screening to obtain large-crystal electro-fused magnesia, electro-fused magnesia and light-burned magnesia.
3. The method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia according to the one-step method of claim 2, characterized in that a heat cycle system in the closed double-body fused magnesia smelting furnace continuously works during smelting to ensure the heat cycle cascade utilization.
4. The preparation method for co-producing fused magnesia and light-burned magnesia by producing large-crystal fused magnesia according to the one-step method of claim 2, is characterized in that in the smelting process, the materials are uniformly distributed in a closed double-body fused magnesia smelting furnace in a layered manner: one or more than two of petroleum coke powder, cosolvent and rare earth oxide, wherein the addition amount of the petroleum coke powder is 2-10 wt% of the weight of the magnesite, the addition amount of the cosolvent is 0.1-3 wt% of the weight of the magnesite, and the addition amount of the rare earth oxide is 0.01-1 wt% of the weight of the magnesite.
5. The one-step process of producing large-crystal fused magnesia with co-production of fused magnesia and light-burned magnesia according to claim 4, wherein the petroleum coke powder is used as heat-increasing, melting-assisting and reducing agent for layered and uniform distribution.
6. The one-step process of preparing large-crystal fused magnesia with co-production of fused magnesia and light-burned magnesia as claimed in claim 4, wherein the cosolvent is one or more of sodium carbonate, calcium fluoride and alumina.
7. The one-step process for producing large-crystal fused magnesia with co-production of fused magnesia and light-burned magnesia according to claim 4, wherein the rare earth oxide is one or more of yttrium oxide, cerium oxide, samarium oxide and lanthanum oxide, and the materials are uniformly distributed in layers.
8. The preparation method for producing large-crystal fused magnesia and co-producing fused magnesia and light-burned magnesia according to the one-step method of claim 2, is characterized in that a hot air circulation temperature control system is adopted to carry out intelligent temperature control on mineral aggregates in a closed double-body fused magnesia smelting furnace, the temperature is slowly kept and reduced, and after cooling for 7-12 days to room temperature, grading crushing and screening are carried out.
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| CN116496075A (en) * | 2023-04-26 | 2023-07-28 | 岫岩满族自治县恒锐镁制品有限公司 | Production method of oversized crystal fused magnesia |
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