CN115231803B - Granulating method of glass batch - Google Patents
Granulating method of glass batch Download PDFInfo
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- CN115231803B CN115231803B CN202210853356.4A CN202210853356A CN115231803B CN 115231803 B CN115231803 B CN 115231803B CN 202210853356 A CN202210853356 A CN 202210853356A CN 115231803 B CN115231803 B CN 115231803B
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- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B1/00—Preparing the batches
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention relates to the field of glass manufacturing, and discloses a granulating method of a glass batch. The method comprises the following steps: spraying water to the glass batch under primary mixing, wherein the spraying rate is 700-1000g/min, the diameter of sprayed liquid drops is not more than 0.01mm, then spraying the obtained primary mixed material with water content not more than 3wt% and material temperature not less than 40 ℃ to the water glass under secondary mixing, wherein the spraying rate is 500-800g/min, the diameter of sprayed liquid drops is not more than 0.01mm, and then dividing the obtained secondary mixed material with water content not more than 6wt% and material temperature not less than 35 ℃ into a first part and a second part for primary granulation and secondary granulation respectively to obtain a granulated material I and a granulated material II; the average particle size of the granulating material I is larger than that of the granulating material II. The method can solve the layering and scattering phenomena in the conveying process of the glass batch and relieve the segregation of the raw material composition.
Description
Technical Field
The invention relates to the technical field of glass manufacturing, in particular to a granulating method of glass batch.
Background
In the production and preparation process of glass batch, generally, the mineral raw materials, the chemical raw materials and the auxiliary raw materials with a certain granularity range are weighed according to a proportion, uniformly mixed in a mixer to form the batch, and then the batch is conveyed, fed and melted in a kiln.
For a long time, due to the melting temperature and specific gravity of the raw materials, the granularity of the raw materials is limited and regulated in a relatively narrow granularity range, for example, quartz sand can only be used with granularity of 100-600 mu m, and about 20% of the granularity of the quartz sand in the processing process is smaller than 100 mu m, so that only a small amount of the granularity is applied and a large amount of the granularity is discarded in a tailing pond, thereby forming great waste.
In addition, in order to increase the melting rate of the raw materials, refractory materials are required to be introduced in the form of fine powder and ultrafine powder as raw materials, so that uneven mixing of the batch materials is easy to cause, and layering and segregation of the raw materials are caused in the conveying process, so that the uniformity of the batch materials is influenced; and when the fine powder and the ultrafine powder are melted in the flame furnace, the fine powder and the ultrafine powder are easy to fly in the feed inlet and the front part of the melting tank, enter the regenerator and easily block the channel, not only waste raw materials are caused, but also environmental pollution is easy to be generated in smoke, and the fine powder and the ultrafine powder in the traditional batch are also easy to cause silicosis occupational diseases of operators in the melting furnace site and the batch workshop.
CN102320715a discloses a glass batch presintering treatment process and its equipment, the treatment process is to mix 0.5-3wt% of binder and 6-8wt% of water into glass batch, mix them uniformly, press them into spherical granules of 3-25mm, add the spherical granules into rotary heating furnace, presintere at 1020-1250 deg.c for 0.5-2h, and add the sintered and densified spherical granules into glass melting furnace from outlet of rotary heating furnace. The treatment process is carried out by transferring carbonate decomposition in the glass batch outside the glass melting furnace, so that although the gas content in the glass batch is reduced, the heat transfer is improved, the time for clarifying and homogenizing the glass is shortened, the energy consumption is reduced, the melting amount can be increased by 20-30% under the condition that the scale of the existing melting furnace is not enlarged, but the clarifying agent is decomposed in the premelting process at an excessively high temperature, the gas content of the batch is lower, the stirring effect on glass liquid is weakened, and the uniformity of the glass is reduced.
CN101913752A discloses an on-line thermal preparation method of glass batch, which comprises adding binder and water into batch, stirring, mixing, and pressing to obtain a product with density of 1.9-2.5t/m 3 The block materials with the size of 300 multiplied by 10 to 600 multiplied by 30mm are preheated at the temperature of 700-1000 ℃, the block materials are crushed in a hot state and then are conveyed and scattered in a feeding pool, the granulating materials prepared by the method have large block size, the time for transferring heat to the inside is increased, the advantage of large heat conductivity coefficient of the granulating materials is lost, the specification and the shape of the granulating materials are uniform, and the preparation difficulty is large.
Disclosure of Invention
The invention aims to solve the problem of segregation of raw material composition caused by segregation and scattering of glass batch in the prior art, and provides a granulating method of the glass batch, which can solve the layering and scattering phenomena in the conveying process of the glass batch and relieve the segregation of the raw material composition.
In order to achieve the above object, the present invention provides a method for granulating a glass batch, comprising the steps of:
(1) Spraying the glass batch with water at a spraying rate of 700-1000g/min under primary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain primary mixture with water content not more than 3wt% and material temperature not less than 40 ℃;
(2) Spraying the primary mixture with water glass at a spraying rate of 500-800g/min under secondary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain a secondary mixture with water content not higher than 6wt% and material temperature not lower than 35 ℃;
(3) Dividing the secondary mixture into a first part and a second part, and carrying out 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 granulating material I is larger than that of the granulating material II.
Through the technical scheme, the granulating method provided by the invention has the following advantages:
the glass batch is sprayed by adopting a secondary mixing mode, and the water glass are sequentially used to prepare two granulated materials with different particle sizes by matching with a grading granulating technology, so that effective particle grading is formed, on-line granulation is realized, layering and scattering phenomena in the conveying process of the glass batch are solved, the environment of an operation site is improved, the waste of raw materials is reduced, the raw material addition amount of fine powder (20-100 micrometers) and superfine powder (less than 20 micrometers) can reach 10-30wt%, and the application of the fine powder and the superfine powder is expanded.
In addition, the granulating method provided by the invention also relieves the segregation of raw material composition, the heat conductivity of the granulated material after entering the kiln is high, the solid phase reaction speed and the formation of glass are improved, the scattered powder in the kiln is reduced, the alkali vapor concentration on the top surface of the siliceous arch is reduced, the corrosion speed of the siliceous arch is reduced under the action of high temperature, the arch drip calculus and the stripe defect generated by the melting of the calculus are effectively reduced, the product quality is improved, and the service life of the kiln is prolonged. The granulating method provided by the invention can realize 3-15 ℃ reduction of the melting temperature, and the comprehensive energy saving is 0.9-4%, and the melting rate is increased by 2-5%. Compared with an ungranulated glass batch, the granulating method provided by the application can reduce the emission of smoke dust particles by 30-50mg/m 3 The environmental protection treatment pressure is reduced.
Drawings
FIG. 1 is a schematic diagram of a granulation system and granulation process employed in one embodiment of the present invention.
Detailed Description
The endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and are understood to encompass values approaching those ranges or values. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the present invention, the terms "first", "second", "I", "II" are used merely to distinguish materials used in different steps or different stages or operations performed, and do not limit specific materials or operations.
The invention provides a granulating method of a glass batch, which comprises the following steps:
(1) Spraying the glass batch with water at a spraying rate of 700-1000g/min under primary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain primary mixture with water content not more than 3wt% and material temperature not less than 40 ℃;
(2) Spraying the primary mixture with water glass at a spraying rate of 500-800g/min under secondary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain a secondary mixture with water content not higher than 6wt% and material temperature not lower than 35 ℃;
(3) Dividing the secondary mixture into a first part and a second part, and carrying out 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 granulating material I is larger than that of the granulating material II.
In the existing glass batch preparation method, the requirement on the granularity of raw materials is severe, and in order to solve the problems of melting and clarifying of sub-batch, ultrafine mineral raw materials are often adopted, but the novel problems of batch segregation and scattering are brought, so that the segregation of raw material composition is caused, and meanwhile, the environmental pollution is generated. In addition, the existing raw material mixing process is generally one-time diffusion flow type mixing, and the formed loose multi-raw material mixture is easy to layer and fly in the conveying process, and flies after entering a kiln, so that the operation environment is poor, the service life of the kiln is influenced, the glass quality is influenced, and the fine materials and the superfine materials cannot be effectively utilized.
The granulating method provided by the invention adopts a two-stage mixing mode to spray the glass batch sequentially by using water and water glass, and prepares two granulated materials with different particle sizes by matching with a grading granulating technology, so that effective particle grading is formed, on-line granulation is realized, layering and scattering phenomena in the conveying process of the glass batch are solved, segregation of raw material composition is relieved, the environment of an operation site is improved, the waste of raw materials is reduced, the raw material addition amount of fine powder (20-100 micrometers) and superfine powder (less than 20 micrometers) can reach 10-30 weight percent, and the application of the fine powder and superfine powder is expanded.
According to some embodiments of the invention, in step (1), the glass batch is sprayed with water at a rate of 700-1000g/min with a diameter of the sprayed droplets of not more than 0.01mm under primary mixing to obtain a primary mix having a water content of not more than 3wt% and a batch temperature of not less than 40 ℃. The water plays a role of a wetting agent, and is sprayed on the surface of the glass batch in a mist form during mixing, so that the viscosity of the water is extremely low and the surface tension is small. In addition, the water facilitates heat transfer of the glass batch materials in the melting furnace, promoting melting and fining thereof.
According to some embodiments of the invention, in order to prevent the glass batch material from being excessively large (30-100 mm in diameter) and consuming much heat when melted, it is preferable that the water is used in an amount of 2-3wt% of the glass batch material.
According to some embodiments of the invention, preferably, the primary mixing is carried out at a stirring speed of 10-20 revolutions per minute; and/or the uniformity of the primary mix is not less than 94%, preferably 95-98%. The adoption of the preferable embodiment is beneficial to obtaining the batch with good uniformity and is beneficial to improving the melting quality.
According to some embodiments of the present invention, in the step (1), the glass batch may be a glass batch conventionally used in the art, and there is no particular limitation thereto, so long as the objective of the present invention can be achieved to some extent by incorporating the granulation method of the present invention.
According to some embodiments of the invention, preferably, the glass batch has an average particle size of no more than 600 microns; more preferably, the content of particles having an average particle diameter of not more than 100 μm in the glass batch is 10 to 30wt% of the glass batch; further preferably, in the glass batch, the mass ratio of the fine powder with the average particle diameter of 20-100 micrometers to the superfine powder with the average particle diameter of less than 20 micrometers is 5-7:1. the granulating method provided by the invention is beneficial to solving layering and scattering phenomena in the glass batch conveying process, reduces waste of raw materials and expands the application of fine powder and superfine powder.
According to some embodiments of the invention, in step (2), the primary mix is sprayed with water glass at a rate of 500-800g/min with a diameter of the sprayed droplets of not more than 0.01mm under secondary mixing to obtain a secondary mix having a water content of not more than 6wt% and a mix temperature of not less than 35 ℃. The steps are beneficial to promoting the mixing uniformity of the binder and the primary mixture and obtaining the mixture meeting the granulating requirement. If water glass is directly added in the granulating process of the batch, the viscosity of the water glass is unfavorable for the diffusion and flow of raw materials, and the uniformity of the batch is poor.
According to some embodiments of the invention, preferably, the secondary mixing is carried out at a stirring speed of 10-20 revolutions per minute. The adoption of the preferred embodiment is beneficial to obtaining the batch with better uniformity.
According to some embodiments of the present invention, in the step (2), the water glass may ensure that the granulated material prepared from the glass batch is not broken during the transportation process, and may provide the obtained granulated material with a certain mechanical strength. Preferably, in step (2), the secondary mix has a granulating strength of 1-1.6MPa, preferably 1.3-1.6MPa. Conventional glass batch materials are barren materials, have no viscosity, are capable of promoting batch material powder bonding, do not cause Chemical Oxygen Demand (COD) and Redox value (Redox) changes, and do not generate bubble defects and color changes.
According to some embodiments of the invention, in step (2), water glass is used as a binder. The water glass is commonly called sodium silicate water solution, and the chemical formula of sodium silicate is Na 2 O·nSiO 2 Wherein the modulus n=sio 2 /Na 2 O (molar ratio), modulus n shows the composition of sodium silicate, an important parameter for sodium silicate, generally between 1.5 and 3.5, the greater the modulus of sodium silicate, the solid sodium silicate is more insoluble in water, n is 1, and can be dissolved in warm water at normal time, n can be dissolved in hot water when the solid sodium silicate is increased, and n can be dissolved in steam with more than 4 atmospheres when the solid sodium silicate is more than 3. The larger the modulus of sodium silicate is, the more Si content is, the viscosity of sodium silicate is increased, the decomposition hardening is easy, the binding force is increased, and the polymerization degree of sodium silicate with different modulus is different, so that the silicic acid components in the hydrolysis products are also greatly different.
According to some embodiments of the invention, preferably, na in the water glass 2 O·nSiO 2 The modulus n of (2) is 2 to 3, preferably 2.4 to 2.8; the adoption of the preferred embodiment is beneficial to reducing the economic cost while meeting the requirement of roll forming. Preferably, in the water glass, na 2 O·nSiO 2 The concentration of (2) is 40-49wt%, preferably 45-48wt%.
According to some embodiments of the invention, the amount of water glass has a direct effect on the strength of the pelletization material, and as the amount of water glass increases, the compressive strength of the pelletization material increases. Preferably, in step (2), na is used 2 O·nSiO 2 The water glass is used in an amount of 1 to 3.5wt%, preferably 2 to 3wt%, of the glass batch.
According to some embodiments of the present invention, the primary mixing and the secondary mixing may be performed in a mixer while spraying may be performed using a plurality of spray heads, which is not particularly limited as long as the primary mix and the secondary mix meeting the above-mentioned requirements can be obtained.
According to some embodiments of the invention, in step (3), the secondary mix is divided into a first part and a second part, the first part is subjected to primary granulation 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 granulating material I is larger than that of the granulating 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 single particle size generates a large amount of gaps in the stacking process, and is mixed with gas, thereby being unfavorable for improving the heat conduction. The invention adopts parallel rolling granulation to produce two granulates with different particle diameters on line, which is beneficial to forming effective close packing and grading of the particles and improving the heat transfer efficiency of the batch.
According to some embodiments of the invention, preferably, the first fraction is 60-65wt% of the secondary mix; the second part is 35-40wt% of the secondary mixture. The preferred embodiment is advantageous in achieving a better particle size distribution.
According to some embodiments of the invention, the primary granulation and the secondary granulation may be performed in a roll granulator, and the ratio of the two obtained granulates may be achieved by controlling the amount of the secondary mix at the inlet of the roll granulator; further, the electromagnetic valve opening of the secondary mixed batch storage bin blanking chute or the electronic weighing system can be controlled.
According to some embodiments of the invention, preferably, in step (3), the average particle size of the granulate I is 20-30mm, preferably 22-27mm.
According to some embodiments of the invention, preferably, in step (3), the average particle size of the granulate material II is 5-15mm, preferably 8-13mm.
The preferred embodiments described above are advantageous for forming a better grain size distribution.
FIG. 1 is a schematic diagram of a granulation system and granulation process employed in one embodiment of the present invention. Specifically:
(1) Carrying out primary mixing on the glass batch in a primary mixer, and simultaneously spraying the glass batch by using water at a spraying rate of 700-1000g/min, wherein the diameter of sprayed liquid drops is not more than 0.01mm so as to obtain a primary mixture with water content not higher than 3wt% and material temperature not lower than 40 ℃;
(2) Carrying out secondary mixing on the primary mixture in a secondary mixer, and simultaneously spraying the primary mixture by using water glass at a spraying rate of 500-800g/min, wherein the diameter of sprayed liquid drops is not more than 0.01mm so as to obtain a secondary mixture with water content not higher than 6wt% and material temperature not lower than 35 ℃;
(3) Dividing the secondary mixture into a first part and a second part through the electromagnetic valve opening of a feed chute of a batch storage bin, and carrying out primary granulation on the first part in a primary granulator to obtain a granulated material I; performing secondary granulation on the second part in a secondary granulator to obtain a granulating material II; the average particle size of the granulating material I is larger than that of the granulating material II.
The graded material obtained by mixing the granulating material I and the granulating material II can be sent to a kiln for melting.
According to a particularly preferred embodiment of the invention, the method for granulating glass batch comprises the following steps:
(1-1) primary mixing the glass batch materials in a primary mixer, wherein the stirring speed of the primary mixing is 10-20 revolutions per minute; meanwhile, water is used for spraying the glass batch, the spraying speed is 700-1000g/min, the diameter of sprayed liquid drops is not more than 0.01mm, and the primary mixed material with the material temperature not lower than 40 ℃ is obtained; wherein the water is used in an amount of 2-3wt% of the glass batch; the uniformity of the primary mixture is 95-98%;
(2-1) subjecting the primary mix to secondary mixing in a secondary mixer, the secondary mixing being carried out at a stirring speed of 10-20 revolutions per minute; simultaneously spraying the primary mixture by using water glass at a spraying rate of 500-800g/min, wherein the diameter of sprayed liquid drops is not more than 0.01mm, and obtaining a secondary mixture with a material temperature not lower than 35 ℃; wherein, na in the water glass 2 O·nSiO 2 The modulus n of (2) is 2.4-2.8; in the water glass, na 2 O·nSiO 2 The concentration of (2) is 45-48wt%; by Na 2 O·nSiO 2 The water glass is used in an amount of 2-3wt% of the glass batch; the granulating strength of the secondary mixture is 1.3-1.6MPa;
(3-1) dividing the secondary mixture into a first part and a second part by the electromagnetic valve position opening of a feed chute of a batch storage bin, wherein the first part is 60-65wt% of the secondary mixture; the second part is 35-40wt% of the secondary mixture; carrying out primary granulation on the first part in a primary granulator to obtain a granulating material I; performing secondary granulation on the second part in a secondary granulator to obtain a granulating material II; the average particle size of the granulating material I is 22-27mm; the average particle size of the granulating material II is 8-13mm.
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 dry matter in the mixture, for example, the water content of the secondary mixture=the total mass of water/(glass batch and Na) 2 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 by examples.
In the following examples and comparative examples, all the raw materials used were commercially available ones unless otherwise specified.
Wherein the chemical composition of the glass batch is as follows in terms of 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 The method comprises the steps of carrying out a first treatment on the surface of the The content of particles with the average particle diameter not higher than 100 micrometers in the glass batch is 20 weight percent of the glass batch; the mass ratio of the fine powder with the average particle size of 20-100 micrometers to the superfine powder with the average particle size of less than 20 micrometers is 6:1.
na in water glass 2 O·nSiO 2 The modulus n of (2.5), na in the water glass 2 O·nSiO 2 The concentration of (2) was 45wt%.
In the following examples and comparative examples, the test methods for each parameter were as follows:
average particle diameter: randomly sampling 20 groups, measuring the particle size by using a steel plate ruler, and taking an average value;
the uniformity adopts a conductivity method, and the specific test method comprises the following steps: drying 100g of mixed materials in a 105 ℃ oven until the weight is constant, cooling, dividing into 10 groups of 5g each, placing 5g of cooled mixed materials in a beaker, adding 200mL of pure water, standing for 5min, stirring in a magnetic stirrer at 40rpm for 5min, taking out and standing for 5min, respectively detecting by using a conductivity tester, recording the conductivity of each group of mixed materials, obtaining standard deviation of the detected conductivity, and calculating uniformity; wherein, the calculation formula of uniformity is: uniformity= (1-standard deviation) ×100%;
granulating strength: measuring by using a digital display particle intensity meter;
the melting rate is calculated as follows: τ=q/S (Q: daily melt amount; S: melt area).
Comparative example 1
(1) Mixing glass batch in a mixer at a stirring speed of 18 rpm, adding water and water glass while mixing, wherein the water content is 3wt% of the glass batch, and Na is used as the water 2 O·nSiO 2 The water glass is 2wt% of the glass batch, and a mixture with water content of 5wt% and material temperature of 40 ℃ is obtained; the uniformity of the mixture is 92%, and the granulating strength is 1.4MPa;
(2) Delivering the mixture into a granulator for granulation to obtain a granulating material with the average particle size of 18 mm;
(3) The granulated material was fed to a kiln for melting at 1630 ℃.
The energy consumption of glass melting is 17000kJ/kg, the daily output of a glass kiln is 90 tons, the melting rate is 0.6%, and the discharge amount of smoke dust particles is 95mg/m 3 。
Comparative example 2
(1) Preparing a mixture according to step (1) of comparative example 1;
(2) Dividing the mixture into a first part and a second part by the electromagnetic valve opening of the feed chute of the batch storage bin, wherein the first part is 60wt% of the mixture, and the second part is 40wt% of the mixture; the first part is sent to a primary granulator for primary granulation to obtain a granulated material I with an average particle size of 25 mm; performing secondary granulation on the second part in a secondary granulator to obtain a granulated material II with the average particle size of 12 mm;
(3) The grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1626 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
The energy consumption for glass melting is 1% compared with that in comparative example 1, the daily output of the glass kiln is 90.5 ton, the melting rate is increased by 0.5% compared with that in comparative example 1, and the discharge amount of smoke dust particles is reduced by 0.6mg/m 3 。
Comparative example 3
(1) Carrying out primary mixing on the glass batch in a primary mixer, wherein the stirring speed of the primary mixing is 18 revolutions per minute, meanwhile, water is used for spraying the glass batch, the spraying speed is 2000g/min, the diameter of sprayed liquid drops is 0.01mm, the water consumption is 3wt% of the glass batch, and the primary mixture with the water content of 3wt% and the material temperature of 45 ℃ is obtained; the uniformity of the primary mixture is 93.5%, and the primary mixture has lumps;
(2) Mixing the primary mixture in a secondary mixer at stirring speed of 18 rpm, spraying the primary mixture with water glass at spraying rate of 700g/min, spraying droplets with diameter of 0.01mm, and mixing with Na 2 O·nSiO 2 Calculating, wherein the consumption of the water glass is 2wt% of the glass batch, and a secondary mixture with water content of 5wt% and material temperature of 40 ℃ is obtained; the granulating strength of the secondary mixture is 1.45MPa;
(3) Granulating the secondary mixture according to the step (2) of the comparative example 2 to obtain a granulated material I and a granulated material II;
(4) The grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1625 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
The energy consumption for glass melting is 1% compared with that in comparative example 1, the daily output of the glass kiln is 90.5 tons, the melting rate is increased by 0.5% compared with that in comparative example 1, and the discharge amount of smoke dust particles is reduced by 2mg/m 3 。
Examples 1-4 illustrate the method of granulating glass batch materials provided by the present invention.
Example 1
(1) Preparing a first-stage mixture according to the step (1) of the comparative example 3, except that the spraying rate is 800g/min, and the rest is the same as the step (1) of the comparative example 3, to obtain the first-stage mixture; the uniformity of the primary mixture is 96.7%;
(2) Preparing a secondary mixture according to step (2) of comparative example 3; the granulating strength of the secondary mixture is 1.46MPa;
(3) Granulating the secondary mixture according to the step (3) of the comparative example 3 to obtain a granulated material I and a granulated material II;
(4) The grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1615 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
The energy consumption of glass melting is 3.4% compared with that of comparative example 1, the daily output of the glass kiln is 94 tons, the melting rate is increased by 4% compared with that of comparative example 1, and the discharge amount of smoke dust particles is reduced by 2mg/m 3 。
Example 2
(1) Carrying out primary mixing on the glass batch in a primary mixer, wherein the stirring speed of the primary mixing is 18 revolutions per minute, meanwhile, water is used for spraying the glass batch, the spraying speed is 950g/min, the diameter of sprayed liquid drops is 0.01mm, the water consumption is 3wt% of the glass batch, and the primary mixture with the water content of 3wt% and the material temperature of 40 ℃ is obtained; the uniformity of the primary mixture is 96.2%;
(2) Mixing the primary mixture in a secondary mixer at stirring speed of 18 rpm, spraying the primary mixture with water glass at a spraying rate of 720g/min, spraying droplets with diameter of 0.01mm, and mixing with Na 2 O·nSiO 2 Calculating, wherein the consumption of the water glass is 2wt% of that of the glass batch, and a secondary mixture with water content of 5wt% and material temperature of 35 ℃ is obtained; the granulating strength of the secondary mixture is 1.43MPa;
(3) Dividing the secondary mixture into a first part and a second part through the electromagnetic valve opening of the feed chute of the batch storage bin, wherein the first part is 65wt% of the secondary mixture, and the second part is 35wt% of the secondary mixture; the first part is sent to a primary granulator for primary granulation to obtain a granulating material I with the average particle size of 25.6 mm; carrying out secondary granulation on the second part in a secondary granulator to obtain a granulated material II with the average particle size of 9.8 mm;
(4) The grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1618 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
The energy consumption of glass melting is 2.7% compared with that of comparative example 1, the daily output of the glass kiln is 93 ton, the melting rate is increased by 3.3% compared with that of comparative example 1, and the discharge amount of smoke dust particles is reduced by 1.8mg/m 3 。
Example 3
The procedure of example 1 was followed except that in step (1), the amount of water used was 1% by weight of the glass batch to obtain a primary mix having a water content of 1% by weight; the uniformity of the primary mixture is 94%; the remainder were the same as in example 1; the grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1624 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
The energy consumption of glass melting is 1.4% compared with that of comparative example 1, the daily output of the glass kiln is 92 tons, the melting rate is increased by 2.2% compared with that of comparative example 1, and the discharge amount of smoke dust particles is reduced by 0.8mg/m 3 。
Example 4
The procedure of example 1 is followed, except that in step (2), na is used 2 O·nSiO 2 The water glass dosage is 1.2wt% of the glass batch, and a secondary mixture with water content of 4.4wt% is obtained; the granulating strength of the secondary mixture is 1.1MPa; the remainder were the same as in example 1; the grade ingredients obtained by mixing the granulating materials I and II are sent to a kiln for melting, and the melting temperature is 1627 ℃, so that the product with the same quality level as that of the comparative example 1 can be obtained.
Glass meltingThe energy consumption is 0.9% compared with that of comparative example 1, the daily output of the glass kiln is 92 tons, the melting rate is increased by 2.2% compared with that of comparative example 1, and the discharge amount of smoke dust particles is reduced by 0.8mg/m 3 。
The result shows that the granulating method provided by the invention is beneficial to solving layering and scattering phenomena in the conveying process of the glass batch, relieves segregation of raw material composition, ensures high heat conductivity of the granulated material after entering the kiln, improves solid-phase reaction speed and glass formation, reduces scattered powder in the kiln, effectively reduces arch drip stones and stripe defects generated by melting the stones, improves product quality and prolongs the service life of the kiln.
The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, a number of simple variants of the technical solution of the invention are possible, including combinations of the individual technical features in any other suitable way, which simple variants and combinations should likewise be regarded as being disclosed by the invention, all falling within the scope of protection of the invention.
Claims (16)
1. A method of granulating a glass batch, the method comprising the steps of:
(1) Spraying the glass batch with water at a spraying rate of 700-1000g/min under primary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain primary mixture with water content not more than 3wt% and material temperature not less than 40 ℃;
(2) Spraying the primary mixture with water glass at a spraying rate of 500-800g/min under secondary mixing, wherein the diameter of sprayed liquid drops is not more than 0.01mm, so as to obtain a secondary mixture with water content not higher than 6wt% and material temperature not lower than 35 ℃;
(3) Dividing the secondary mixture into a first part and a second part, and carrying out 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 granulating material I is larger than that of the granulating material II;
wherein, in the step (3), the first part is 60-65wt% of the secondary mixture; the second part is 35-40wt% of the secondary mixture; the average grain diameter of the granulating material I is 20-30mm; the average particle size of the granulating material II is 5-15mm.
2. The granulation method as claimed in claim 1, wherein in the step (1), the stirring speed of the primary mixing is 10 to 20 rpm; and/or, the uniformity of the primary mixture is not lower than 94%.
3. The granulation process according to claim 2, characterized in that in step (1), the homogeneity of the primary mix is between 95 and 98%.
4. A pelletization process according to any one of claims 1 to 3, characterized in that in step (1), the water is used in an amount of 2 to 3% by weight of the glass batch.
5. A pelletising method according to any one of claims 1 to 3, characterised in that in step (1) the glass batch has an average particle size of not more than 600 μm.
6. A granulating method according to any one of claims 1 to 3, wherein in step (1), the content of particles having an average particle diameter of not more than 100 μm in the glass batch is 10 to 30% by weight of the glass batch.
7. A granulating method according to any one of claims 1 to 3, wherein in step (1), the mass ratio of fine powder having an average particle diameter of 20 to 100 μm to ultrafine powder having an average particle diameter of less than 20 μm in the glass batch is 5 to 7:1.
8. a granulation process according to any one of claims 1 to 3, characterized in that in step (2), the stirring speed of the secondary mixing is 10-20 revolutions per minute; and/or the granulating strength of the secondary mixture is 1-1.6 MPa.
9. The granulation method according to claim 8, wherein in the step (2), the granulation strength of the secondary mix is 1.3 to 1.6MPa.
10. A granulation process according to any one of claims 1 to 3, characterized in that Na in the water glass 2 O·nSiO 2 Modulus of (2)n2-3; and/or, in the water glass, na 2 O·nSiO 2 The concentration of (2) is 40-49wt%.
11. Granulation process according to claim 10, characterized in that Na in the water glass 2 O·nSiO 2 Modulus of (2)n2.4-2.8.
12. Granulation process according to claim 10, characterized in that in the water glass Na 2 O·nSiO 2 The concentration of (2) is 45-48wt%.
13. A granulation process according to any one of claims 1 to 3, characterized in that in step (2) Na is used 2 O·nSiO 2 The water glass is used in an amount of 1 to 3.5wt% of the glass batch.
14. The granulation method as claimed in claim 13, wherein in step (2), na is used as Na 2 O·nSiO 2 The water glass is used in an amount of 2-3wt% of the glass batch.
15. A granulation process according to any one of claims 1 to 3, characterized in that in step (3), the average particle size of the granulate I is 22-27mm.
16. A granulation process according to any one of claims 1 to 3, characterized in that in step (3), the average particle size of the granulate material II is 8 to 13mm.
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