CN115231803B - Granulation method of glass batch - Google Patents

Abstract

The invention relates to the field of glass manufacture and discloses a granulation method for glass batch materials. The method comprises: under primary mixing, spraying glass batch material with water, the spraying rate is 700-1000g/min, and the diameter of the sprayed droplets is not more than 0.01mm, and then under secondary mixing, the obtained water content Water glass is used to spray the primary mixture not higher than 3wt% and the material temperature not lower than 40°C, the spraying rate is 500-800g/min, the diameter of the sprayed droplets is not greater than 0.01mm, and then the obtained water content is not greater than The secondary mixture with a material temperature higher than 6wt% and not lower than 35°C is divided into the first part and the second part for primary granulation and secondary granulation respectively to obtain granulated material I and granulated material II; granulated The average particle size of material I is larger than the average particle size of granulated material II. The method can solve the delamination and scattering phenomena in the conveying process of glass batch materials, and alleviate the segregation of raw material composition.

Description

Granulation method of glass batch

technical field

The invention relates to the technical field of glass manufacturing, in particular to a granulation method of glass batch materials.

Background technique

In the production and preparation process of glass batch materials, it is generally necessary to weigh mineral raw materials, chemical raw materials and auxiliary raw materials in a certain particle size range in proportion, mix them uniformly in the mixer to form batch materials, and then transport and feed the batch materials , into the kiln for melting.

For a long time, affected by the melting temperature and specific gravity of raw materials, the particle size of raw materials has been limited and specified in a relatively narrow particle size range. For example, quartz sand can only be used with a particle size of 100-600 μm, while about 20% of the quartz sand is processed. The particle size is less than 100μm, only a small amount is used, and a large amount is discarded in the tailings pond, forming a large waste.

In addition, sometimes in order to increase the melting rate of raw materials, it is necessary to introduce refractory materials in the form of fine powder and ultrafine powder as raw materials, so it is easy to cause uneven mixing of batch materials and lead to stratification and segregation of raw materials during the transportation process, which affects the The uniformity of the batch material; and when the fine powder and ultrafine powder are melted in the flame furnace, it is easy to fly at the feeding port and the front of the melting pool, and it is easy to block the channel when entering the regenerator, which not only causes waste of raw materials, but also easily produces in the flue gas. Environmental pollution, fine powder and ultra-fine powder in traditional batch materials are also likely to cause silicosis occupational diseases in the furnace site and batching workshop operators.

CN102320715A discloses a glass batch pre-sintering treatment process and its equipment. In this treatment process, 0.5-3wt% binder and 6-8wt% water are mixed into the glass batch material, mixed, and pressed into 3-25mm The spherical pellets are added into the rotary heating furnace, pre-fired at 1020-1250°C for 0.5-2h, and the sintered and densified spherical pellets are added to the glass melting furnace from the outlet of the rotary heating furnace . This treatment process is carried out by decomposing the carbonate in the glass batch and transferring it to the outside of the glass melting furnace. Although the gas content in the glass batch is reduced, the heat transfer is improved, and the time for glass clarification and homogenization is shortened. The energy consumption is reduced, and the melting capacity can be increased by 20-30% under the condition that the scale of the melting furnace is not expanded at present, but the clarifying agent will decompose during the pre-melting process at too high a temperature, and the gas content of the batch material will be low, weakening the The agitation of the glass liquid will reduce the uniformity of the glass.

CN101913752A discloses an on-line thermal preparation method of glass batch materials. In this method, the batch materials are added to adhesive and water, stirred and mixed evenly, and then pressed into a density of 1.9-2.5t/m ³ and a size of 300×300×10 to 600×600×30mm The bulk material is preheated at 700-1000°C, and the bulk material is broken in a hot state, and then transported and sprinkled in the feeding tank. The granulated material prepared by this method has a large block and increases the heat. The time passed to the interior loses the advantage of the large thermal conductivity of the granulated material, and the size and shape of the granulated material are uniform, making it difficult to prepare.

Contents of the invention

The object of the present invention is to provide a granulation method for glass batch materials in order to overcome the problem of segregation and scatter of glass batch materials in the prior art, which can lead to segregation of raw material composition. and scattering phenomenon, and alleviate the segregation of raw material composition.

In order to achieve the above object, the present invention provides a method for granulating glass batch materials, the method comprising the steps of:

(1) Under primary mixing, the glass batch material is sprayed with water, the spray rate is 700-1000g/min, and the diameter of the sprayed droplet is not greater than 0.01mm, so as to obtain a water content of not higher than 3wt% and a material temperature not higher than Primary mixture below 40°C;

(2) Under the secondary mixing, the primary mixture is sprayed with water glass, the spray rate is 500-800g/min, and the diameter of the sprayed droplets is not more than 0.01mm, so that the water content is not higher than 6wt%. And the secondary mixture whose material temperature is not lower than 35°C;

(3) Dividing the secondary mixture into a first part and a second part, performing primary granulation on the first part to obtain granulated material I; performing secondary granulation on the second part to obtain granulated material Chemical material II; the average particle size of the granulated material I is greater than the average particle size of the granulated material II.

Through the above technical scheme, the granulation method provided by the invention has the following advantages:

Using the two-stage mixing method, water and water glass are used to spray the glass batch material in sequence, and two kinds of granulated materials with different particle sizes are produced with the gradation granulation technology to form an effective particle gradation and realize online granulation. , to solve the phenomenon of stratification and scattering in the process of conveying glass batch materials, improve the environment of the job site, and reduce the waste of raw materials, the addition of fine powder (20-100 microns) and ultra-fine powder (less than 20 microns) The amount can reach 10-30wt%, expanding the application of fine powder and superfine powder.

In addition, the granulation method provided by the invention also alleviates the segregation of the raw material composition, the thermal conductivity of the granulated material after entering the kiln is high, the solid phase reaction speed and the formation of glass are improved, the powder scattered in the kiln is reduced, and the silica The concentration of alkali vapor on the top surface decreases, and under the action of high temperature, the erosion speed of the silicon roof is slowed down, which effectively reduces the streak defects caused by the melting of the stone and the stone, improves the product quality, and prolongs the kiln’s service life. service life. The granulation method provided by the invention can reduce the melting temperature by 3-15°C, comprehensively save energy by 0.9-4%, and increase the melting rate by 2-5%. Moreover, compared with ungranulated glass batch materials, the granulation method provided by the present application can reduce the emission of flue gas and dust particles by 30-50 mg/m ³ , reducing the pressure of environmental protection treatment.

Description of drawings

Fig. 1 is a schematic diagram of a granulation system and a granulation method adopted in a specific embodiment of the present invention.

Detailed ways

Neither the endpoints nor any values of the ranges disclosed herein are limited to such precise ranges or values, and these ranges or values are understood to include values approaching these ranges or values. For numerical ranges, between the endpoints of each range, between the endpoints of each range and individual point values, and between individual point values can be combined with each other to obtain one or more new numerical ranges, these values Ranges should be considered as specifically disclosed herein.

In the present invention, the used "first", "second", "first level", "second level", "I", "II" are only used to distinguish different steps or materials used in different stages or carried out The operation does not limit the specific material or operation.

The invention provides a method for granulating glass batch materials, the method comprising the steps of:

(1) Under primary mixing, the glass batch material is sprayed with water, the spray rate is 700-1000g/min, and the diameter of the sprayed droplet is not greater than 0.01mm, so as to obtain a water content of not higher than 3wt% and a material temperature not higher than Primary mixture below 40°C;

(2) Under the secondary mixing, the primary mixture is sprayed with water glass, the spray rate is 500-800g/min, and the diameter of the sprayed droplets is not more than 0.01mm, so that the water content is not higher than 6wt%. And the secondary mixture whose material temperature is not lower than 35°C;

(3) Dividing the secondary mixture into a first part and a second part, performing primary granulation on the first part to obtain granulated material I; performing secondary granulation on the second part to obtain granulated material Chemical material II; the average particle size of the granulated material I is greater than the average particle size of the granulated material II.

In the existing glass batch preparation method, the particle size of raw materials is strictly required, and in order to solve the problem of sub-batch melting and clarification, ultra-fine mineral raw materials are often used, but it brings new problems of batch segregation and scattering, It leads to segregation of raw material composition and environmental pollution. In addition, the existing raw material mixing process is generally one-time diffusion flow mixing, and the loose multi-raw material mixture formed is easy to stratify and fly during the transportation process, and scatter after entering the kiln, resulting in poor working environment and affecting the life of the kiln. , Affect the quality of the glass, and the fine and ultra-fine materials cannot be effectively utilized.

However, the granulation method provided by the present invention uses water and water glass to spray the glass batch material in sequence by adopting a two-stage mixing method, and cooperates with the gradation granulation technology to manufacture two kinds of granulated materials with different particle sizes to form effective granules. Grading realizes on-line granulation, solves the phenomenon of stratification and scattering during the conveying process of glass batch materials, alleviates the segregation of raw material composition, improves the environment of the job site, and reduces the waste of raw materials, fine powder (20- 100 microns) and superfine powder (less than 20 microns) can be added in an amount of 10-30 wt%, expanding the application of fine powder and superfine powder.

According to some embodiments of the present invention, in step (1), under primary mixing, the glass batch material is sprayed with water at a spray rate of 700-1000g/min, and the diameter of the sprayed droplets is not greater than 0.01mm, so as to obtain Primary mixture with water content not higher than 3wt% and material temperature not lower than 40°C. Wherein, the water acts as a wetting agent. During the mixing process, the water is sprayed on the surface of the glass batch in the form of mist while mixing. The viscosity of the water is extremely small and the surface tension is small. Using the above The characteristics combined with the specific spraying method of the present invention make it easy to wet and spread between the raw material particles, and to a certain extent lock the relative movement between the mixed fine powder, ultrafine powder and larger particle size, avoiding unbalanced The segregation and stratification of batch materials caused by movement (such as belt transmission) improves the uniformity of the primary mixture. In addition, the water facilitates the heat conduction of the glass batch in the furnace, promoting its melting and refining.

According to some embodiments of the present invention, in order to prevent the ball of the glass batch material from being too large (with a diameter of 30-100mm), and to consume more heat during melting, preferably, the amount of the water is 2% of the glass batch material. -3wt%.

According to some embodiments of the present invention, preferably, the stirring speed of the primary mixing is 10-20 rpm; and/or, the uniformity of the primary mixing is not less than 94%, preferably 95- 98%. Adopting the above-mentioned preferred embodiment is beneficial to obtain batch materials with good uniformity, and is beneficial to improve the melting quality.

According to some embodiments of the present invention, in step (1), the glass batch material can be a conventionally used glass batch material in this field, and there is no special limitation on this, as long as it cooperates with the granulation method of the present invention to a certain extent On realizing the purpose of the invention of the present invention.

According to some embodiments of the present invention, preferably, the average particle size of the glass batch material is not higher than 600 microns; more preferably, the content of particles with an average particle size not higher than 100 microns in the glass batch material is 10-30wt% of the glass batch material; further preferably, in the glass batch material, the mass ratio of the fine powder with an average particle diameter of 20-100 microns to the ultrafine powder with an average particle diameter of less than 20 microns is 5- 7:1. The granulation method provided by the invention is beneficial to solve the phenomenon of delamination and scattering in the conveying process of glass batch materials, reduces the waste of raw materials, and expands the application of fine powder and ultrafine powder.

According to some embodiments of the present invention, in step (2), under the secondary mixing, the primary mixture is sprayed with water glass, the spraying rate is 500-800g/min, and the diameter of the sprayed droplets is not more than 0.01 mm to obtain a secondary mixture with a water content not higher than 6wt% and a material temperature not lower than 35°C. The above steps are beneficial to promote the mixing uniformity of the binder and the primary mixture, and obtain a mixture meeting the granulation requirements. If water glass is directly added in the granulation process of batch materials, its viscosity is not conducive to the diffusion and flow of raw materials, which will cause poor uniformity of batch materials.

According to some embodiments of the present invention, preferably, the stirring speed of the secondary mixing is 10-20 rpm. Adopting the above-mentioned preferred embodiment is beneficial to obtain batch materials with better uniformity.

According to some embodiments of the present invention, in step (2), the water glass can ensure that the granulated material prepared from the glass batch is not broken during transportation, and can make the obtained granulated material have certain mechanical strength. Preferably, in step (2), the granulation strength of the secondary mixture is 1-1.6 MPa, preferably 1.3-1.6 MPa. Traditional glass batch materials are barren materials and have no viscosity. The water glass can promote the combination of batch powder and materials without causing changes in chemical oxygen demand (COD) and redox values (Redox), and does not produce bubble defects and Color changes.

According to some embodiments of the present invention, in step (2), water glass is used as the binder. Sodium silicate is commonly known as sodium silicate aqueous solution. The chemical formula of sodium silicate is Na ₂ O·nSiO ₂ . Among them, the modulus n=SiO ₂ /Na ₂ O (molar ratio), and the modulus n shows the strength of sodium silicate. Composition is an important parameter of sodium silicate, generally between 1.5 and 3.5. The larger the modulus of sodium silicate, the harder it is for solid sodium silicate to dissolve in water. When n is 1, it can be dissolved in normal temperature water. When n increases It needs hot water to dissolve, and when n is greater than 3, it needs steam above 4 atmospheres to dissolve. The larger the modulus of sodium silicate, the more Si content, the viscosity of sodium silicate increases, it is easy to decompose and harden, and the cohesive force increases, and the degree of polymerization of sodium silicate with different modulus is different, resulting in the silicon in its hydrolyzate. There are also major differences in the acid components.

According to some embodiments of the present invention, preferably, the modulus n of Na ₂ O·nSiO ₂ in the water glass is 2-3, preferably 2.4-2.8; High-quality granulated materials while reducing economic costs. Preferably, the concentration of Na ₂ O·nSiO ₂ in the water glass is 40-49wt%, preferably 45-48wt%.

According to some embodiments of the present invention, the amount of water glass has a direct impact on the strength of the granulated material, and as the amount of water glass increases, the compressive strength of the granulated material also increases. Preferably, in step (2), based on Na ₂ O·nSiO ₂ , the water glass is used in an amount of 1-3.5 wt%, preferably 2-3 wt%, of the glass batch.

According to some embodiments of the present invention, the primary mixing and the secondary mixing can be performed in a mixer, and multiple nozzles can be used for spraying at the same time. Grade mix and grade mix are sufficient.

According to some embodiments of the present invention, in step (3), the secondary mixture is divided into a first part and a second part, and the first part is subjected to primary granulation to obtain granulated material I; The second part is subjected to secondary granulation to obtain granulated material II; the average particle size of the granulated material I is larger than the average particle size of the granulated material II. Although the granulated material can improve the heat conduction of the batch material compared with the traditional batch material, the granulated material with a single particle size produces a large number of voids and gas inclusions in the accumulation, which is not conducive to the improvement of heat conduction. The invention adopts parallel rolling granulation to produce two kinds of granulated materials with different particle sizes on-line, which is beneficial to form effective particle dense packing and gradation, and improve the heat transfer efficiency of batch materials.

According to some embodiments of the present invention, preferably, the first part is 60-65wt% of the secondary mixture; the second part is 35-40wt% of the secondary mixture. Adopting the above-mentioned preferred embodiment is beneficial to achieve a better particle grading effect.

According to some embodiments of the present invention, the primary granulation and the secondary granulation can be carried out in a roller press granulator, and the ratio of the two granulated materials obtained can be adjusted by controlling the inlet of the roller press granulator. It can be realized by adding the amount of secondary mixed material; further, it can be controlled by the electromagnetic valve position opening of the secondary mixed batch material storage silo discharge pipe or the electronic weighing system.

According to some embodiments of the present invention, preferably, in step (3), the average particle diameter of the granulated material I is 20-30mm, preferably 22-27mm.

According to some embodiments of the present invention, preferably, in step (3), the average particle diameter of the granulated material II is 5-15 mm, preferably 8-13 mm.

Adopting the above-mentioned preferred embodiment is conducive to the formation of better particle gradation.

Fig. 1 is a schematic diagram of a granulation system and a granulation method adopted in a specific embodiment of the present invention. specifically:

(1) Perform primary mixing of the glass batch material in a primary mixer, and spray the glass batch material with water at the same time, the spraying rate is 700-1000g/min, and the diameter of the sprayed droplet is not greater than 0.01mm, with Obtain a primary mixture with a water content not higher than 3wt% and a material temperature not lower than 40°C;

(2) In the secondary mixer, the primary mixture is carried out secondary mixing, and water glass is used to spray the primary mixture at the same time, the spraying rate is 500-800g/min, and the diameter of the sprayed droplets is not greater than 0.01mm to obtain a secondary mixture with a water content not higher than 6wt% and a material temperature not lower than 35°C;

(3) Divide the secondary mixture into the first part and the second part through the electromagnetic valve position opening of the feeding chute of the batch material storage bin, and carry out the primary granulation of the first part in the primary granulator granules to obtain granulated material I; the second part is subjected to secondary granulation in a secondary granulator to obtain granulated material II; the average particle diameter of the granulated material I is larger than that of the granulated material II the average particle size.

The grade batch obtained by mixing granulated material I and granulated material II can be sent to the kiln for melting.

According to a particularly preferred embodiment of the present invention, the granulation method of the glass batch comprises the following steps:

(1-1) Perform primary mixing of the glass batch materials in a primary mixer, the stirring speed of the primary mixing is 10-20 rpm; at the same time, the glass batch materials are sprayed with water, and the spraying rate is 700-1000g/min, the diameter of the sprayed droplets is not greater than 0.01mm, and the primary mixture with a material temperature of not lower than 40°C is obtained; wherein, the amount of the water is 2-3wt% of the glass batch; The uniformity of the primary mixture is 95-98%;

(2-1) The primary mixture is subjected to secondary mixing in a secondary mixer, and the stirring speed of the secondary mixing is 10-20 rpm; while using water glass to mix the primary mixture Spraying, the spraying rate is 500-800g/min, the diameter of the sprayed droplets is not more than 0.01mm, and the secondary mixture with a material temperature of not lower than 35°C is obtained; wherein, the _Na2O · _nSiO2 in the water glass The modulus n is 2.4-2.8; in the water glass, the concentration of Na ₂ O·nSiO ₂ is 45-48wt%; calculated as Na ₂ O·nSiO ₂ , the amount of the water glass is 1% of the glass batch 2-3wt%; the granulation strength of the secondary mixture is 1.3-1.6MPa;

(3-1) The secondary mixture is divided into a first part and a second part by the electromagnetic valve position opening of the material storage silo discharging chute, and the first part is 60- 65wt%; the second part is 35-40wt% of the secondary mixture; the first part is carried out primary granulation in a primary granulator to obtain granulated material I; the second A part is subjected to secondary granulation in a secondary granulator to obtain granulated material II; the average particle size of the granulated material I is 22-27 mm; the average particle size of the granulated material II is 8-13 mm.

In the present invention, the water content of the mixture is the ratio of the quality of water in the mixture to the quality of the dry matter in the mixture, such as the water content of the secondary mixture=the total mass of water/(glass batch and _Na2 O·nSiO ₂ total mass), wherein the total mass of water is the sum of the quality of water in the step (1) and the water in the water glass.

The present invention will be described in detail below by way of examples.

In the following examples and comparative examples, unless otherwise specified, the raw materials used are commercially available.

Among them, the chemical composition of the glass batch is calculated as oxides: 58wt% SiO ₂ , 20wt% Al ₂ O ₃ , 10.5wt% Na ₂ O, 1.5wt% K ₂ O, 4.5wt% Li ₂ O, 3.2wt% MgO and 2.3wt% ZrO ₂ ; in the glass batch material, the content of particles with an average particle size not higher than 100 microns is 20 wt % of the glass batch material; the average particle size is 20-100 micron fine powder and the average particle size The mass ratio of ultrafine powder less than 20 microns is 6:1.

The modulus n of Na ₂ O·nSiO ₂ in the water glass is 2.5, and the concentration of Na ₂ O·nSiO ₂ in the water glass is 45 wt%.

In the following examples and comparative examples, the test method of each parameter is as follows:

Average particle size: 20 groups of random samples are taken, the particle size is measured with a steel ruler, and the average value is taken;

The uniformity adopts the conductivity method. The specific test method is: take 100g of the mixed material and put it in an oven at 105°C to dry to constant weight. After cooling, divide it into 10 groups, each group is 5g, and put 5g of the cooled mixed material in a beaker. Add 200mL of pure water, let it stand for 5 minutes, stir it in a 40rpm magnetic stirrer for 5 minutes, take it out and let it stand for 5 minutes, use a conductivity tester to test it, record the conductivity of each group of mixed materials, and compare the measured conductivity Calculate the standard deviation and calculate the uniformity; wherein, the calculation formula of the uniformity is: uniformity=(1-standard deviation)×100%;

Granulation strength: measured by a digital display particle strength meter;

The formula for calculating the melting rate is as follows: τ=Q/S (Q: daily melting amount; S: melting area).

Comparative example 1

(1) Mix the glass batch materials in a mixer, the stirring speed of mixing is 18 rev/min, add water and water glass while mixing, the consumption of water is 3wt% of the glass batch materials, take _Na2O ·nSiO ₂ meter, the consumption of water glass is 2wt% of glass batch, obtains the mixture that water content is 5wt% and material temperature is 40 ℃; The uniformity of this mixture is 92%, and granulation strength is 1.4MPa;

(2) the mixture is sent to the granulator for granulation, and the granulated material with an average particle diameter of 18mm is obtained;

(3) Send the granulated material to the kiln for melting, and the melting temperature is 1630°C.

The energy consumption of glass melting is 17000kJ/kg, the daily output of glass furnace is 90 tons, the melting rate is 0.6%, and the emission of flue gas and dust particles is 95mg/m ³ .

Comparative example 2

(1) prepare compound according to the step (1) of comparative example 1;

(2) The mixture is divided into the first part and the second part by the electromagnetic valve position opening of the material storage bin lowering chute, the first part is 60wt% of the mixture, and the second part is 40wt% of the mixture; The first part is sent to the primary granulator to carry out primary granulation to obtain the granulated material I with an average particle diameter of 25 mm; the second part is carried out to secondary granulation in the secondary granulator to obtain an average particle diameter of 25 mm. 12mm granulated material II;

(3) The grading obtained by mixing the granulated material I and the granulated material II is sent to a kiln for melting, and the melting temperature is 1626° C., and a product with the same quality level as that of Comparative Example 1 can be obtained.

Compared with comparative example 1, the energy consumption of glass melting is 1% energy saving, the daily output of glass furnace is 90.5 tons, the melting rate is increased by 0.5% compared with comparative example 1, and the emission of flue gas and dust particles is reduced by 0.6mg/ ^m3 .

Comparative example 3

(1) The glass batch material is mixed in the first-level mixer, the stirring speed of the first-level mixing is 18 rpm, and the glass batch material is sprayed with water at a spray rate of 2000g/min, and the spray droplets The diameter of the glass is 0.01mm, and the amount of water is 3wt% of the glass batch to obtain a primary mixture with a water content of 3wt% and a material temperature of 45°C; the uniformity of the primary mixture is 93.5%, and there are lumps ;

(2) In the secondary mixer, the primary mixture is carried out to secondary mixing, and the stirring speed of the secondary mixing is 18 revs/min, while water glass is used to spray the primary mixture, and the spray rate is 700g/min, The diameter of the spray droplet is 0.01mm, in Na ₂ O · nSiO ₂ Calculated, the consumption of water glass is 2wt% of glass batch material, obtains the secondary mixture that water content is 5wt% and material temperature is 40 ℃; The granulation strength of the grade mixture is 1.45MPa;

(3) According to the step (2) of comparative example 2, the secondary mixture is granulated to obtain granulated material I and granulated material II;

(4) The grading obtained by mixing the granulated material I and the granulated material II is sent to a kiln for melting, and the melting temperature is 1625° C., and a product with the same quality level as Comparative Example 1 can be obtained.

The energy consumption of glass melting is 1% less than that in Comparative Example 1, the daily output of the glass furnace is 90.5 tons, the melting rate is increased by 0.5% compared with Comparative Example 1, and the emission of flue gas and dust particles is reduced by 2 mg/m ³ .

Examples 1-4 are used to illustrate the granulation method of the glass batch material provided by the present invention.

Example 1

(1) prepare the primary mixture according to the step (1) of comparative example 3, the difference is that the spray rate is 800g/min, and all the other are the same as the step (1) of comparative example 3 to obtain the primary mixture; The uniformity of grade mixture is 96.7%;

(2) prepare secondary mixture according to the step (2) of comparative example 3; the granulation strength of this secondary mixture is 1.46MPa;

(3) According to the step (3) of comparative example 3, the secondary mixture is granulated to obtain granulated material I and granulated material II;

(4) The grading obtained by mixing the granulated material I and the granulated material II was sent to a kiln for melting. The melting temperature was 1615° C., and a product with the same quality level as Comparative Example 1 could be obtained.

The energy consumption of glass melting is 3.4% lower than that in Comparative Example 1. The daily output of the glass furnace is 94 tons ^.

Example 2

(1) The glass batch material is mixed in the first-level mixer, and the stirring speed of the first-level mixing is 18 rpm. At the same time, the glass batch material is sprayed with water, and the spray rate is 950g/min. The diameter of the glass is 0.01mm, and the amount of water is 3wt% of the glass batch, so as to obtain a primary mixture with a water content of 3wt% and a material temperature of 40°C; the uniformity of the primary mixture is 96.2%;

(2) In the secondary mixer, the primary mixture is carried out to secondary mixing, and the stirring speed of the secondary mixing is 18 revs/min, while water glass is used to spray the primary mixture, and the spray rate is 720g/min, The diameter of the spray droplet is 0.01mm, in Na ₂ O · nSiO ₂ Calculated, the consumption of water glass is 2wt% of glass batch material, obtains the secondary mixture that water content is 5wt% and material temperature is 35 ℃; The granulation strength of the grade mixture is 1.43MPa;

(3) The secondary mixture is divided into the first part and the second part through the opening of the electromagnetic valve position of the discharge chute of the batch material storage bin, the first part is 65wt% of the secondary mixture, and the second part is the secondary mixture 35wt% of the material; the first part is sent to the primary granulator for primary granulation to obtain a granulated material I with an average particle diameter of 25.6mm; the second part is carried out for secondary granulation in the secondary granulator Granules, obtaining the granulated material II with an average particle diameter of 9.8 mm;

(4) The grading obtained by mixing the granulated material I and the granulated material II is sent to a kiln for melting, and the melting temperature is 1618° C., and a product with the same quality level as that of Comparative Example 1 can be obtained.

Compared with comparative example 1, the energy consumption of glass melting is 2.7% less than that of comparative example 1. The daily output of glass furnace is 93 tons ^. .

Example 3

According to the method of embodiment 1, the difference is that in the step (1), the consumption of water is 1wt% of the glass batch, and the primary mixture obtained with a water content of 1wt%; the uniformity of the primary mixture is 94 %; the rest are the same as in Example 1; the grading obtained by mixing the granulated material I and the granulated material II is sent to the kiln for melting, and the melting temperature is 1624 ° C, and the same quality level as that of Comparative Example 1 can be obtained. product.

The energy consumption of glass melting is 1.4% less than that in Comparative Example 1, the daily output of glass furnace is 92 tons, the melting rate is increased by 2.2% compared with Comparative Example 1, and the emission of flue gas and dust particles is reduced by 0.8mg/ ^m3 .

Example 4

According to the method of Example 1, the difference is that in step (2), in Na ₂ O nSiO ₂ , the consumption of water glass is 1.2wt% of the glass batch, so that the water content is 4.4wt% for secondary mixing material; the granulation strength of the secondary mixture is 1.1MPa; all the other are the same as in Example 1; the grading batch obtained by mixing the granulated material I and the granulated material II is sent to the kiln for melting, and the melting temperature is 1627 ℃, the product with the same quality level as Comparative Example 1 can be obtained.

The energy consumption of glass melting is 0.9% less than that in Comparative Example 1, the daily output of glass furnace is 92 tons, the melting rate is increased by 2.2% compared with Comparative Example 1, and the emission of flue gas dust particles is reduced by 0.8mg/ ^m3 .

It can be seen from the above results that adopting the granulation method provided by the present invention is beneficial to solve the stratification and scattering phenomenon in the conveying process of glass batch materials, alleviate the segregation of raw material composition, and the thermal conductivity of the granulated material after entering the kiln is high. The speed of solid-phase reaction and the formation of glass are improved, the powder scattered in the kiln is reduced, and the streak defects caused by the melting of the stone and the stone are effectively reduced, the product quality is improved, and the service life of the kiln is extended.

The preferred embodiments of the present invention have been described in detail above, however, the present invention is not limited thereto. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, including the combination of various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the disclosed content of the present invention. All belong to the protection scope of the present invention.

Claims (16)

1. a granulation method of glass batch material, is characterized in that, the method comprises the steps: (1) Under primary mixing, the glass batch is sprayed with water at a spray rate of 700-1000g/min, and the diameter of the sprayed droplets is not greater than 0.01mm, so as to obtain a water content of not higher than 3wt% and a temperature of the material not higher than Primary mixture below 40°C; (2) Under the secondary mixing, the primary mixture is sprayed with water glass at a spraying rate of 500-800g/min, and the diameter of the sprayed droplets is not greater than 0.01mm to obtain a water content of not higher than 6wt%. And the secondary mixture whose material temperature is not lower than 35°C; (3) Dividing the secondary mixture into a first part and a second part, performing primary granulation on the first part to obtain granulated material I; performing secondary granulation on the second part to obtain granulated material I Chemical material II; the average particle diameter of the granulated material I is greater than the average particle diameter of the granulated material II; Wherein, in step (3), the first part is 60-65wt% of the secondary mixture; the second part is 35-40wt% of the secondary mixture; The average particle size is 20-30mm; the average particle size of the granulated material II is 5-15mm. 2. The granulation method according to claim 1, characterized in that, in step (1), the stirring speed of the primary mixing is 10-20 rpm; and/or, the primary mixing The uniformity is not less than 94%. 3. The granulation method according to claim 2, characterized in that, in step (1), the uniformity of the primary mixture is 95-98%. 4. The granulation method according to any one of claims 1-3, characterized in that, in step (1), the amount of the water used is 2-3wt% of the glass batch. 5. The granulation method according to any one of claims 1-3, characterized in that, in step (1), the average particle size of the glass batch is not higher than 600 microns. 6. The granulation method according to any one of claims 1-3, characterized in that, in step (1), in the glass batch, the content of particles with an average particle size not higher than 100 microns is 10-30wt% of the above glass batch. 7. The granulation method according to any one of claims 1-3, characterized in that, in step (1), in the glass batch, the fine powder with an average particle size of 20-100 microns and the average particle size The mass ratio of ultrafine powder with diameter less than 20 microns is 5-7:1. 8. The granulation method according to any one of claims 1-3, characterized in that, in step (2), the stirring speed of the secondary mixing is 10-20 rpm; and/or, the The granulation strength of the secondary mixture is 1-1.6 MPa. 9. The granulation method according to claim 8, characterized in that, in step (2), the granulation strength of the secondary mixture is 1.3-1.6 MPa. 10. according to the described granulation method in any one of claim 1-3, it is characterized in that, in described water glass Na ₂ O· n SiO The modulus n of SiO ₂ is 2-3; And/or, described In the water glass, the concentration of Na ₂ O· n SiO ₂ is 40-49wt%. 11. The granulation method according to claim 10, characterized in that the modulus n of Na ₂ O· n SiO ₂ in the water glass is 2.4-2.8. 12. The granulation method according to claim 10, characterized in that, in the water glass, the concentration of Na ₂ O· n SiO ₂ is 45-48wt%. 13. The granulation method according to any one of claims 1-3, characterized in that, in step (2), in terms of Na ₂ O· n SiO ₂ , the dosage of the water glass is 1-3.5wt% of the material. 14. The granulation method according to claim 13, characterized in that, in step (2), in terms of Na ₂ O· n SiO ₂ , the dosage of the water glass is 2-3wt% of the glass batch . 15. The granulation method according to any one of claims 1-3, characterized in that, in step (3), the average particle diameter of the granulated material I is 22-27mm. 16. The granulation method according to any one of claims 1-3, characterized in that, in step (3), the average particle diameter of the granulated material II is 8-13 mm.

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