CN115231803A - Granulation method of glass batch - Google Patents

Abstract

The invention relates to the field of glass manufacturing, and discloses a granulation method of a glass batch. The method comprises the following steps: under the first-stage mixing, spraying the glass batch with water at a spraying speed of 700-1000g/min and with a spray droplet diameter of not more than 0.01mm, then under the second-stage mixing, spraying the obtained first-stage mixture with a water content of not more than 3wt% and a material temperature of not less than 40 ℃ with water glass at a spraying speed of 500-800g/min and with a spray droplet diameter of not more than 0.01mm, and then dividing the obtained second-stage mixture with a water content of not more than 6wt% and a material temperature of not less than 35 ℃ into a first part and a second part to respectively carry out first-stage granulation and second-stage granulation to obtain a granulated material I and a granulated material II; the average particle size of the granulated material I is larger than the average particle size of the granulated material II. The method can solve the layering and flying phenomena in the glass batch conveying process and relieve the segregation of the 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 for glass batch materials.

Background technique

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

In addition, sometimes in order to increase the melting rate of raw materials, it is necessary to introduce refractory substances in the form of fine powder and ultra-fine powder as raw materials, so it is easy to cause uneven mixing of ingredients and lead to stratification and segregation of raw materials during the transportation process, which affects the The uniformity of the batching material; and when the fine powder and ultra-fine 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 generated in the flue gas Environmental pollution, fine powder and ultra-fine powder in traditional batching materials are also likely to cause silicosis occupational diseases for operators at the furnace site and batching workshop.

CN102320715A discloses a glass batch pre-firing treatment process and its equipment. In the treatment process, 0.5-3wt% of a binder and 6-8wt% of water are mixed into the glass batch, mixed and pressed into a 3-25mm size The spherical pellets are added to the rotary heating furnace, pre-fired at 1020-1250 ° C for 0.5-2h, and the sintered and compacted 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 amount can be increased by 20-30% without expanding the scale of the current furnace. However, in the process of pre-melting at an excessively high temperature, the clarifying agent will decompose, and the gas content of the batch will be low, weakening the The agitation of the glass liquid reduces the uniformity of the glass.

CN101913752A discloses a method for on-line thermal preparation of glass batch materials. In the method, the batch materials are added with a binder and water to be stirred and mixed uniformly, 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 ℃, and the bulk material is crushed in the 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 it takes to transfer to the interior loses the advantage of the large thermal conductivity of the granulated material, and the specification and shape of the granulated material are uniform, making it difficult to prepare.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the problems of the segregation of raw materials caused by the segregation and scattering of glass batch materials in the prior art, and provide a granulation method of glass batch materials, which can solve the delamination in the process of glass batch material transportation. and scattering phenomenon, and alleviate the segregation of raw material composition.

In order to achieve the above purpose, the present invention provides a method for granulating glass batch materials, which comprises the following steps:

(1) Under the first-level mixing, the glass batch is sprayed with water, the spray rate is 700-1000g/min, and the diameter of the spray droplets is not more than 0.01mm, so that the water content is not higher than 3wt% and the material temperature is not higher than 0.01mm. Primary mix below 40℃;

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

(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 granulation Compound II; the average particle size of the pelletized material I is larger than the average particle size of the pelletized material II.

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

Using two-stage mixing method, the glass batch materials are sprayed with water and water glass in turn, 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. , solves the phenomenon of delamination and scattering during the conveying process of glass batch materials, improves the environment of the job site, and reduces the waste of raw materials. The amount can reach 10-30wt%, expanding the application of fine powder and ultra-fine powder.

In addition, the granulation method provided by the invention also alleviates the segregation of the raw material composition, the granulated material after entering the kiln has high thermal conductivity, the solid phase reaction speed and the formation of glass are improved, the powder scattered in the kiln is reduced, and the siliceous material is reduced. The concentration of alkali vapor on the top surface decreases. Under the action of high temperature, the erosion rate of the siliceous dome is slowed down, which effectively reduces the drop stone and the streak defect caused by the melting of the stone, improves the product quality, and prolongs the furnace life. service life. The granulation method provided by the invention can realize that the melting temperature is lowered by 3-15° C., the comprehensive energy saving is 0.9-4%, and the melting rate is increased by 2-5%. And compared with ungranulated glass batch materials, the granulation method provided by the present application can reduce the emission of flue gas dust particles by 30-50 mg/m ³ , and reduce 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

The endpoints of ranges and any values disclosed herein are not limited to the precise ranges or values, which are to be understood to encompass values proximate to those ranges or values. For ranges of values, the endpoints of each range, the endpoints of each range and the individual point values, and the individual point values can be combined with each other to yield one or more new ranges of values that Ranges should be considered as specifically disclosed herein.

In the present invention, the terms "first", "second", "primary", "secondary", "I", and "II" are only used to distinguish the materials used or performed in different steps or different stages. The operation does not limit the specific material or operation.

The invention provides a kind of granulation method of glass batch material, and the method comprises the following steps:

(1) Under the first-level mixing, the glass batch is sprayed with water, the spray rate is 700-1000g/min, and the diameter of the spray droplets is not more than 0.01mm, so that the water content is not higher than 3wt% and the material temperature is not higher than 0.01mm. Primary mix below 40℃;

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

(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 granulation Compound II; the average particle size of the pelletized material I is larger than the average particle size of the pelletized 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 melting and clarification of sub batch materials, ultra-fine mineral raw materials are often used, but it brings new problems of batch material segregation and scattering, It leads to the segregation of raw material composition and also produces environmental pollution. In addition, the existing mixing process of raw materials is generally one-time diffusion flow mixing, and the loose multi-raw material mixture formed is easy to layer and fly during the conveying process, and fly after entering the kiln, resulting in poor working environment and affecting the life of the kiln. , Affect the quality of glass, can not effectively use fine and ultra-fine materials.

In the granulation method provided by the present invention, by adopting a two-stage mixing method, water and water glass are used to spray the glass batch material in turn, and two kinds of granulated materials with different particle sizes are produced with the gradation and granulation technology to form effective particles. Grading, realizes online granulation, solves the phenomenon of layering and scattering in the process of glass batch transportation, 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 powders (less than 20 microns) can be added in an amount of up to 10-30wt%, expanding the application of fine powders and superfine powders.

According to some embodiments of the present invention, in step (1), under the first-level mixing, the glass batch is sprayed with water, the spraying rate is 700-1000 g/min, and the diameter of the sprayed droplets is not greater than 0.01 mm, so as to obtain A primary mixture with a water content not higher than 3wt% and a 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 material in the form of a mist while mixing. The viscosity of the water is extremely small and the surface tension is small. The characteristics combined with the specific spraying method of the present invention make it easy to wet and diffuse among the raw material particles, lock the relative movement between the mixed fine powder, ultra-fine powder and larger particle size particles to a certain extent, and avoid unbalanced Segregation and stratification of batches caused by movement (such as belt conveyors), thereby improving the homogeneity of the primary mix. In addition, the water facilitates the heat transfer of the glass batch in the furnace, facilitating its melting and refining.

According to some embodiments of the present invention, in order to prevent the material ball of the glass batch material from being too large (30-100 mm in diameter) and consume a lot of heat during melting, preferably, the amount of water used 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 95-20 rpm. 98%. The use of the above-mentioned preferred embodiments is beneficial to obtain batch materials with good uniformity, and is beneficial to the improvement of melting quality.

According to some embodiments of the present invention, in step (1), the glass batch material can be a glass batch material conventionally used in the field, which is not particularly limited, as long as the granulation method of the present invention is combined to a certain extent To achieve 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 is not higher than 600 microns; more preferably, in the glass batch, the content of particles with an average particle size not higher than 100 microns 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 size of 20-100 microns and the ultrafine powder with an average particle size of less than 20 microns is 5- 7:1. The granulation method provided by the invention is beneficial to solve the phenomenon of layering and scattering in the conveying process of glass batch materials, reduces the waste of raw materials, and expands the application of fine powder and ultra-fine powder.

According to some embodiments of the present invention, in step (2), under secondary mixing, the primary mixture is sprayed with water glass, the spraying rate is 500-800 g/min, and the diameter of the sprayed droplets is not greater than 0.01 mm, to obtain a secondary mixture with a water content not higher than 6 wt% 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 that meets the granulation requirements. If water glass is directly added in the granulation process of the batch material, its viscosity is not conducive to the diffusion and flow between the raw materials, resulting in poor uniformity of the batch material.

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

According to some embodiments of the present invention, in step (2), the water glass can ensure that the granulated material obtained from the glass batch material is not broken during the conveying process, and can make the obtained granulated material have a 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. The traditional glass batch materials are barren materials and have no viscosity. The water glass can promote the combination of batch materials and powder, and does not cause changes in chemical oxygen demand (COD) and redox value (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. Water glass is the common name of sodium silicate aqueous solution. The chemical formula of sodium silicate is Na ₂ O·nSiO ₂ , wherein the modulus n=SiO ₂ /Na ₂ O (molar ratio), and the modulus n shows the Composition is an important parameter of sodium silicate, generally between 1.5-3.5. The larger the modulus of sodium silicate, the more difficult it is for solid sodium silicate to dissolve in water. When n is 1, it can be dissolved in room temperature water. When n increases It needs hot water to dissolve, and when n is greater than 3, it needs steam of more than 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, which leads to the increase of silicon in the hydrolyzed product. There are also significant differences in acid composition.

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; the above preferred embodiments are beneficial to meet the requirements of roll forming the pelletized material while reducing the economic cost. Preferably, in the water glass, the concentration of Na ₂ O·nSiO ₂ is 40-49 wt %, preferably 45-48 wt %.

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

According to some embodiments of the present invention, the first-stage mixing and the second-stage mixing can be carried out in a mixer, and multiple nozzles can be used for spraying at the same time, which is not particularly limited, as long as a product that meets the above requirements can be obtained. Grade mixes and secondary mixes 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; In the second part, secondary granulation is performed 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 of a single particle size produces a large number of voids in the stacking, 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 diameters on-line, which is favorable for forming effective close-packing and grading of particles and improving the heat transfer efficiency of the batching materials.

According to some embodiments of the present invention, preferably, the first part is 60-65 wt % of the secondary mixture; the second part is 35-40 wt % of the secondary mixture. Adopting the above-mentioned preferred embodiment is beneficial to achieve 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 granulator, and the ratio of the two granulated materials obtained can be controlled by controlling the inlet of the roller granulator. The addition amount of the secondary mixture can be realized; further, it can be controlled by the opening of the solenoid valve position or the electronic weighing system of the discharging chute of the batching material storage bin of the secondary mixing.

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

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

The use of the above-mentioned preferred embodiments is beneficial 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) The glass batch is mixed in the first-stage mixer, and the glass batch is sprayed with water at the same time. Obtain a first-class mixture with a water content not higher than 3wt% and a material temperature not lower than 40°C;

(2) The first-stage mixture is mixed in the second-stage mixer, and the first-stage mixture is sprayed with water glass at the same time, and the spray rate is 500-800g/min, and the diameter of the sprayed droplets is not More 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) The secondary mixture is divided into a first part and a second part by the opening of the solenoid valve of the feeding chute of the batching silo, and the first part is first-stage granulator in the first-stage granulator. granulate 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 size of the granulated material I is larger than that of the granulated material II average particle size.

The grade ingredients obtained by mixing the granulated material I and the 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 material comprises the following steps:

(1-1) The glass batch is mixed in a first-stage mixer, and the stirring speed of the first-stage mixing is 10-20 rev/min; at the same time, the glass batch is sprayed with water, and the spray rate is It is 700-1000g/min, the diameter of sprayed droplets is not more than 0.01mm, and a first-class mixture with a material temperature of not less than 40 ° C is obtained; wherein, the amount of water used is 2-3wt% of the glass batch; The uniformity of the primary mixture is 95-98%;

(2-1) Perform secondary mixing of the primary mixture in a secondary mixer, and the stirring speed of the secondary mixing is 10-20 rpm; at the same time, use water glass to mix the primary mixture Carry out spraying, the spraying rate is 500-800g/min, the diameter of sprayed droplets is not more than 0.01mm, and a secondary mixture with a material temperature of not less than 35 ° C is obtained; wherein, the Na ₂ O·nSiO ₂ in the water glass is The modulus n is 2.4-2.8; in the water glass, the concentration of Na ₂ O·nSiO ₂ is 45-48 wt %; in terms of Na ₂ O·nSiO ₂ , the dosage of the water glass is the amount of the glass batch material. 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 opening of the solenoid valve of the feeding chute of the batching silo, and the first part is 60-60 mm of the secondary mixture. 65wt%; the second part is 35-40wt% of the secondary mixture; the first part is subjected to primary granulation in a primary granulator to obtain granulated material I; the second Part of the secondary granulation is carried out 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 mass of water in the mixture to the mass of the dry base material in the mixture, for example, the water content of the secondary mixture=the total mass of water/(glass batch and Na ₂ The total mass of O·nSiO ₂ ), wherein the total mass of water is the sum of the mass of water in step (1) and the mass of water in the water glass.

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

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

Among them, the chemical composition of the glass batch in terms of oxides is: 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 20wt% of the glass batch material; fine powder with an average particle size of 20-100 microns and an average particle size The mass ratio of ultrafine powder smaller 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 were randomly sampled, the particle size was measured with a steel ruler, and the average value was taken;

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

Granulation strength: measured by digital particle strength meter;

The calculation formula of 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 mixing speed is 18 rev/min, add water and water glass while mixing, and the amount of water is 3wt% of the glass batch materials, with Na ₂ O·nSiO ₂ , the dosage of water glass is 2wt% of the glass batch, to obtain a mixture with a water content of 5wt% and a material temperature of 40°C; the uniformity of the mixture is 92%, and the granulation strength is 1.4MPa;

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

(3) The granulated material is sent 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 the glass furnace is 90 tons, the melting rate is 0.6%, and the emission of flue gas dust particles is 95 mg/m ³ .

Comparative Example 2

(1) prepare mixture according to step (1) of Comparative Example 1;

(2) Divide the mixture into a first part and a second part through the opening of the solenoid valve of the feeding chute of the batching silo, 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 for primary granulation to obtain a granulated material I with an average particle size of 25 mm; the second part is subjected to secondary granulation in the secondary granulator to obtain an average particle size of 12mm granulated material II;

(3) The grade ingredients obtained by mixing the granulated material I and the granulated material II are sent to the kiln for melting, and the melting temperature is 1626 ° C, and the product of the same quality level as the comparative example 1 can be obtained.

Compared with the comparative example 1, the energy consumption of glass melting can save 1%, the daily output of the glass furnace is 90.5 tons, the melting rate is increased by 0.5% compared with the comparative example 1, and the emission of flue gas dust particles is reduced by 0.6mg/m ³ .

Comparative Example 3

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

(2) Carry out secondary mixing of the primary mixture in the secondary mixer, the stirring speed of the secondary mixing is 18 rpm, and simultaneously use water glass to spray the primary mixture, and the spray rate is 700 g/min, The diameter of the sprayed droplets is 0.01 mm, and the amount of water glass is 2 wt % of the glass batch in terms of Na ₂ O nSiO ₂ to obtain a secondary mixture with a water content of 5 wt % and a material temperature of 40 ° C; 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 the granulated material I and the granulated material II;

(4) The grade ingredients obtained by mixing the granulated material I and the granulated material II are sent to the kiln for melting, and the melting temperature is 1625 ° C, and the product of the same quality level as the comparative example 1 can be obtained.

Compared with Comparative Example 1, the energy consumption of glass melting can save 1%, and the daily output of the glass furnace is 90.5 tons. Compared with Comparative Example 1, the melting rate is increased by 0.5%, 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 provided by the present invention.

Example 1

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

(2) According to the step (2) of Comparative Example 3, the secondary mixture was prepared; the granulation strength of the secondary mixture was 1.46MPa;

(3) according to the step (3) of Comparative Example 3, the secondary mixture is granulated to obtain the granulated material I and the granulated material II;

(4) The grade ingredients obtained by mixing the granulated material I and the granulated material II are sent to the kiln for melting, and the melting temperature is 1615 ° C, and the product of the same quality level as the comparative example 1 can be obtained.

Compared with Comparative Example 1, the energy consumption of glass melting can save 3.4%, the daily output of the glass furnace is 94 tons, the melting rate is increased by 4% compared with Comparative Example 1, and the emission of flue gas and dust particles is reduced by 2 mg/m ³ .

Example 2

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

(2) The primary mixture is mixed in the secondary mixer, the stirring speed of the secondary mixing is 18 rpm, and the primary mixture is sprayed with water glass, and the spray rate is 720 g/min, The diameter of the sprayed droplet is 0.01mm, and the amount of water glass is 2wt% of the glass batch in terms of Na ₂ O nSiO ₂ to obtain a secondary mixture with a water content of 5wt% and a material temperature of 35°C; The granulation strength of the grade mixture is 1.43MPa;

(3) The secondary mixture is divided into the first part and the second part by the opening of the solenoid valve of the feeding chute of the batching silo, 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 size of 25.6mm; the second part is subjected to secondary granulation in the secondary granulator granules to obtain granulated material II with an average particle diameter of 9.8 mm;

(4) The grade ingredients obtained by mixing the granulated material I and the granulated material II are sent to the kiln for melting, and the melting temperature is 1618 ° C, and the product of the same quality level as the comparative example 1 can be obtained.

Compared with Comparative Example 1, the energy consumption of glass melting can save 2.7%, and the daily output of the glass furnace is 93 tons. Compared with Comparative Example 1, the melting rate is increased by 3.3%, and the emission of flue gas and dust particles is reduced by 1.8 mg/ ^m3 . .

Example 3

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

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

Example 4

According to the method of Example 1, the difference is that in step (2), in terms of Na ₂ O·nSiO ₂ , the amount of water glass is 1.2 wt % of the glass batch to obtain a secondary mixture with a water content of 4.4 wt % The granulation strength of the secondary mixed material is 1.1MPa; the rest are the same as in Example 1; the grade ingredients obtained by mixing the granulated material I and the granulated material II are sent to the kiln for melting, and the melting temperature is 1627 ℃, the 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 can save 0.9%, and the daily output of the glass furnace is 92 tons. Compared with Comparative Example 1, the melting rate is increased by 2.2%, and the emission of flue gas and dust particles is reduced by 0.8mg/ ^m3 . .

It can be seen from the above results that the use of the granulation method provided by the present invention is conducive to solving the phenomenon of layering and scattering during the conveying process of glass batch materials, relieving the segregation of the raw material composition, and 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, and the powder scattered in the kiln is reduced, which effectively reduces the drop stones and the streak defects caused by the melting of the stones, improves the product quality, and prolongs the service life of the kiln.

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

Claims (10)

1. A method of granulating a glass batch, the method comprising the steps of:

(1) Under the first-stage mixing, spraying the glass batch by using water, wherein the spraying speed is 700-1000g/min, and the diameter of a sprayed liquid drop is not more than 0.01mm, so as to obtain a first-stage mixture with the water content not higher than 3wt% and the material temperature not lower than 40 ℃;

(2) Under the condition of secondary mixing, spraying the primary mixture by using water glass, wherein the spraying speed is 500-800g/min, and the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain a secondary mixture with the water content not higher than 6wt% and the material temperature not lower than 35 ℃;

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

2. The granulation method according to claim 1, wherein in the step (1), the stirring speed of the primary mixing is 10 to 20 rpm; and/or the homogeneity of the first-grade mixture is not less than 94%, preferably 95-98%.

3. Granulation process according to claim 1 or 2, characterized in that in step (1) the water is used in an amount of 2-3% by weight of the glass batch.

4. A granulation process as claimed in any one of claims 1 to 3, wherein in step (1), the glass batch has an average particle size not higher than 600 μm;

preferably, the content of particles having an average particle size of not more than 100 μm in the glass batch is 10 to 30wt% of the glass batch;

more preferably, in the glass batch, the mass ratio of the fine powder with the average particle size of 20-100 microns to the ultrafine powder with the average particle size of less than 20 microns is 5-7:1.

5. the granulation method as claimed in any one of claims 1 to 3, wherein in the step (2), the stirring rotation speed of the secondary mixing is 10 to 20 revolutions per minute; and/or the granulation strength of the secondary mixture is 1-1.6MPa, preferably 1.3-1.6MPa.

6. Granulation process according to any of claims 1 to 3, characterized in that Na is contained in the water glass ₂ O·nSiO ₂ The modulus n of (A) is 2 to 3, preferably 2.4 to 2.8; and/or, in the water glass, na ₂ O·nSiO ₂ The concentration of (B) is 40 to 49wt%, preferably 45 to 48wt%.

7. Granulation process according to any of claims 1 to 3, characterized in that in step (2), na is used ₂ O·nSiO ₂ The amount of water glass used is 1 to 3.5wt%, preferably 2 to 3wt% of the glass batch.

8. Granulation process according to any of the claims 1 to 3, wherein in step (3) said first fraction is 60-65wt% of said secondary mix; the second part is 35-40wt% of the secondary mix.

9. Granulation process according to any one of the claims 1 to 3, wherein in step (3) the average particle size of the granulate I is between 20 and 30mm, preferably between 22 and 27mm.

10. Granulation process according to any of the claims 1 to 3, wherein in step (3) the granulated material II has an average particle size of 5 to 15mm, preferably 8 to 13mm.

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