CN114262233A - Novel glass melting furnace tank bottom large brick and preparation process thereof - Google Patents
Novel glass melting furnace tank bottom large brick and preparation process thereof Download PDFInfo
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Abstract
The invention belongs to the technical field of refractory material preparation, and particularly relates to a novel large brick at the bottom of a glass melting furnace tank and a preparation process thereof. The novel large brick at the bottom of the glass melting furnace pool consists of a synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement and micro-silica powder, wherein the mass sum of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement is 100 percent, wherein the synthetic material accounts for 50-60 percent, the flint clay accounts for 10-20 percent, the refractory clay accounts for 10-15 percent, the mullite fine powder accounts for 5-10 percent and the high-alumina cement accounts for 1-5 percent; the mass of the micro silicon powder accounts for 1-5% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement. The novel large brick at the bottom of the glass melting furnace tank has excellent high-temperature mechanical bearing capacity, good stability of a brick body at high temperature and good durability, and can meet the requirement of the 10-15 year kiln period.
Description
Technical Field
The invention belongs to the technical field of refractory material preparation, and particularly relates to a novel large brick at the bottom of a glass melting furnace tank and a preparation process thereof.
Background
The float plate glass industry is an important component of the building material industry in China. In recent years, with the leap development of glass production technology, the realization of the targets of float industrial production value increase, energy conservation, emission reduction and the like in China is promoted by the initial results of measures such as industrial structure adjustment, resource integration, autonomous innovation of production industrial technology and the like. The glass melting furnace is used as core thermal equipment for glass production, and is continuously developed in the direction of higher efficiency and lower energy consumption, and the melting furnace is required to improve combustion intensity, strengthen heat radiation, enhance heat efficiency, reduce heat loss and reduce environmental pollution, so that a refractory material for building the melting furnace needs to bear higher temperature, sharper temperature change, stronger chemical corrosion, severe stress damage and higher heat preservation requirements.
The glass melting furnace is a thermal equipment for melting glass, which is formed by scientifically preparing various refractory materials without reaction. As the physical, chemical and mechanical conditions of each part are different, the parts require the performance of the refractory material for the glass melting furnace to be suitable for the parts, and the refractory material does not generate adverse effect on various adjacent refractory materials of other types under the controllable high-temperature environment so as to ensure that the melting furnace has long service life. With the increasing application of various special glasses in daily life, glass manufacturers require newly-built glass melting furnaces to have higher melting temperature and larger daily melting amount.
As the daily melting amount of glass is increased to more than 1200 tons, the clay bricks at the bottom of the existing melting furnace are not enough to have enough supporting capacity of a melting furnace main body, and meanwhile, the risk that molten glass penetrates through the upper isolation bricks is increased due to the increase of the temperature of the melting furnace, so that the pool bottom supporting bricks are required to have certain capacity of resisting molten glass erosion.
Disclosure of Invention
The purpose of the invention is: provides a novel large brick at the bottom of a glass melting furnace. The novel large brick at the bottom of the glass melting furnace has excellent high-temperature mechanical bearing capacity, good brick stability and long durability; the invention also provides a preparation method thereof.
The novel large brick at the bottom of the glass melting furnace pool consists of a synthetic material, flint clay, fire clay, mullite fine powder, high-alumina cement and micro-silica powder, wherein the mass sum of the synthetic material, the flint clay, the fire clay, the mullite fine powder and the high-alumina cement is 100 percent, wherein the synthetic material accounts for 50-60 percent, the flint clay accounts for 10-20 percent, the fire clay accounts for 10-15 percent, the mullite fine powder accounts for 5-10 percent, and the high-alumina cement accounts for 1-5 percent; the mass of the micro silicon powder accounts for 1-5% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
Wherein: the refractoriness of the refractory clay is 1750 ℃, and the refractory clay comprises the following chemical compositions: al (Al)2O3 35-45％、SiO2 50-60％、Fe2O3 1.2-1.5％、K2O+Na2O 1-2.5％、CaO 0.5-1.5％。
The granularity of the mullite fine powder is 200-75 um.
The high alumina cement is marked as CA50-A900 or CA 50-A700.
The chemical composition of the micro silicon powder is as follows: SiO 22 75-98％、Al2O3 0.8-1.2％、Fe2O3 0.6-1.2％、MgO 0.6-0.8％、CaO 0.2-0.4％、Na21.1 to 1.5 percent of O; the granularity is 0.1-0.3 um.
The synthetic material consists of 50-55% of bauxite, 40-45% of synthetic mullite and 5% of a bonding agent in percentage by mass; the binding agent is one of lignin or cyclodextrin.
The preparation method of the synthetic material comprises the following steps: adding water into bauxite, synthetic mullite and a binding agent, mixing and molding by a wet method, extruding the mixture into a shaped block with a wavy groove on the upper surface, drying the shaped block into grey white at room temperature, drying the grey white at 40-80 ℃ for 48-72 hours in a drying chamber, calcining the grey white at 1400-1420 ℃ for 72-74 hours after kiln loading, firing the grey white, and finally crushing the grey white into particles with the particle size of 3-5mm to prepare the synthetic material.
Wherein:
the mass of the added water accounts for 4-9% of the sum of the mass of the bauxite, the synthetic mullite and the bonding agent.
The size of the sizing block is 200x110x60 mm.
The invention relates to a preparation process of a novel glass melting furnace tank bottom big brick, which comprises the following steps:
(1) preparing a blank body: completely mixing the synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement, micro silicon powder and water, pouring the mixture into a mold, and performing high-frequency vibration molding to obtain a blank;
(2) demolding and drying: the blank body is communicated with the die to be kept stand for 72 hours, and then is demoulded to carry out natural maintenance;
(3) putting the well-maintained blank into a drying chamber with the temperature of 55-85 ℃ for fully drying for 72-96 hours;
(4) high-temperature calcination: placing the blank dried in the step (3) into a high-temperature kiln, continuously heating to 500-50 ℃ within 72-100h, keeping the temperature constant for 22-24h, heating to 1000-1050 ℃ within 65-95h, keeping the temperature constant for 40-55h, heating to 1400-1420 ℃ within 48-55h, keeping the temperature constant for 20-40h, heating to 1480-1500 ℃ within 15-24h, keeping the temperature constant for 10-15h, finally performing step cooling annealing to 510-100 ℃ within 44-72 h at the speed of 10-22 ℃/h, cooling to room temperature after opening the kiln, and finishing the calcination;
(5) polishing: cutting the glass melting furnace into proper sizes according to the design requirements of the melting furnace, and smoothly polishing six surfaces of the glass melting furnace to prepare the heavy load-bearing brick for the bottom of the glass melting furnace.
Wherein:
the mass of the added water in the step (1) accounts for 5-10% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder, the high-alumina cement and the micro-silica powder.
The frequency of the high-frequency vibration in the step (1) is 100-105 times/min, and the time is 30-40 min.
And (3) naturally curing for 24-48h at 15-30 ℃ in the step (2).
The calcination of the synthetic material can ensure that the small-sized brick can be fully sintered and vitrified, and plays a great role in the formation of mullite phase and the volume stability after vitrification. If the raw materials are directly added into the large brick material, the size of the large brick blank reaches the large size of 950x650x350mm, and the ideal mullite state cannot be completely reached even after long-time co-firing, so the primary calcination of the synthetic material is to meet the requirements of the bottom of the tank furnace on temperature, bearing, high-temperature stability and certain degree of molten glass corrosion resistance.
And (4) high-temperature calcination, wherein the free water molecules in the brick body are continuously discharged by preheating the front section at low temperature, a glass phase is separated out in the middle-temperature rising calcination process, the movement track of particles is stabilized by high-temperature sintering so as to be fully combined, and stress and shearing force are eliminated by stepped temperature reduction annealing so as to avoid explosion.
The novel large brick at the bottom of the glass melting furnace tank has the advantages that the working surface can isolate the erosion of molten glass to a certain extent, the large brick has enough supporting strength, is suitable for large melting furnaces with daily melting amount exceeding 1200T, meanwhile, the melting temperature of the melting furnace is obviously improved, the heat efficiency and the temperature controllability are easy, glass manufacturers are helped to improve the glass quality, the yield is increased and stabilized, and the production cost is saved.
Compared with the prior art, the invention has the following beneficial effects:
(1) the novel large brick at the bottom of the glass melting furnace pool is scientifically prepared from high-quality raw materials, uniform mullite is formed at the grain junction during firing, and the large brick is difficult to be used from SiO2The composition is eroded at high positions (due to mullite of the particles)The non-uniformity can cause the thickness of the local mullite to be different, thereby causing SiO at the part with thin thickness2The content is high. ) Has certain glass liquid erosion resistance, and the used synthetic material units are uniformly mixed, so that the crystallization development is good.
(2) The novel large brick at the bottom of the glass melting furnace tank has excellent high-temperature mechanical bearing capacity, good stability of a brick body at high temperature and good durability, and can meet the requirement of the 10-15 year kiln period.
(3) The novel large brick at the bottom of the glass melting furnace tank has the advantages of reasonable raw material proportion, easily obtained raw material components, convenience for industrial production, popularization and application, adaptation to industrial requirements, excellent high-temperature bearing property and certain glass liquid erosion resistance.
(4) The novel large brick at the bottom of the glass melting furnace provided by the invention is Al2O3Content is more than or equal to 40 percent, Fe2O3The content of the (B) is less than or equal to 1.5 percent, and the volume density is more than or equal to 2.25g/cm3The apparent porosity is less than or equal to 20 percent, the re-burning line change of X2H at 1400 ℃ is between-0.4 percent and positive 0.1 percent, and the heat conductivity coefficient at 1000 ℃ is less than or equal to 1.2W/m.k.
(5) According to the preparation method of the novel large brick at the bottom of the glass melting furnace tank, the large brick formed by high-frequency vibration keeps consistent in overall compactness and uniformity, the basic particles fully discharge surface air and are fully fused with the combined fine powder under high-frequency motion, the supporting force and stability of the brick body at high temperature are greatly improved under the condition of high-temperature continuous sintering, and the preparation method is particularly suitable for the requirements of large glass melting furnaces.
(6) According to the preparation method of the novel large brick at the bottom of the glass melting furnace tank, the raw materials are fully vitrified through staged constant-temperature calcination, the particles are tightly combined, the phenomenon of falling particles and cracking cannot occur in the subsequent cutting and processing process, and the internal stress and the shearing force of the brick body are released in stages in the staged constant-temperature process, so that cracks and edge cracking caused by stress and expansion at high temperature in the using process are avoided; various large-size and special-shaped bricks can be customized and produced according to design requirements.
Detailed Description
The present invention is further described below with reference to examples.
Example 1
The novel large brick at the bottom of the glass melting furnace in the embodiment 1 is composed of a synthetic material, flint clay, chamotte, mullite fine powder, high alumina cement and silica fume, wherein the sum of the mass of the synthetic material, the flint clay, the chamotte, the mullite fine powder and the high alumina cement is 100%, and the synthetic material is 60%, the flint clay 10%, the chamotte 15%, the mullite fine powder 10% and the high alumina cement 5%; the mass of the micro silicon powder accounts for 3 percent of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
Wherein: the refractoriness of the refractory clay is 1750 ℃, and the refractory clay comprises the following chemical compositions: al (Al)2O3 39％、SiO256％、Fe2O3 1.2％、K2O+Na2O 1.7％、CaO 0.7％。
The granularity of the mullite fine powder is 75 um.
The high alumina cement is marked as CA 50-A900.
The chemical composition of the micro silicon powder is as follows: SiO 22 96％、Al2O3 1.1％、Fe2O3 0.6％、MgO 0.7％、CaO 0.3％、Na21.3 percent of O; the particle size is 0.3 um.
The synthetic material consists of 55% of bauxite, 40% of synthetic mullite and 5% of a bonding agent in percentage by mass; the binding agent is lignin.
The preparation method of the synthetic material comprises the following steps: adding water into bauxite, synthetic mullite and a binding agent, mixing and molding by a wet method, extruding the mixture into a shaped block with a wavy groove on the upper surface, drying the shaped block into grey white at room temperature, drying the grey white in a drying chamber at 60 ℃ for 60 hours, placing the grey white in a kiln, calcining the grey white at 1400 ℃ for 72 hours, and finally crushing the grey white into 3mm particles to obtain the synthetic material.
Wherein:
the mass of the added water accounts for 7 percent of the sum of the mass of the bauxite, the mass of the synthetic mullite and the mass of the bonding agent.
The size of the sizing block is 200x110x60 mm.
The preparation process of the novel glass melting furnace tank bottom big brick in the embodiment 1 comprises the following steps:
(1) preparing a blank body: completely mixing the synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement, micro silicon powder and water, pouring the mixture into a mold, and performing high-frequency vibration molding to obtain a blank;
(2) demolding and drying: the blank body is communicated with the die to be kept stand for 72 hours, and then is demoulded to carry out natural maintenance;
(3) putting the well-maintained blank into a drying chamber with the temperature of 70 ℃ for fully drying for 85 hours;
(4) high-temperature calcination: putting the dried green body obtained in the step (3) into a high-temperature kiln, continuously heating to 520 ℃ within 85h, keeping the temperature for 24h, heating to 1020 ℃ within 80h, keeping the temperature for 48h, heating to 1400 ℃ within 55h, keeping the temperature for 30h, heating to 1480 ℃ within 18h, keeping the temperature for 12h, finally carrying out step cooling annealing to 350 ℃ within 60 h at the speed of 19 ℃/h, opening the kiln, cooling to room temperature, and finishing calcination;
(5) polishing: cutting the glass melting furnace into proper sizes according to the design requirements of the melting furnace, and smoothly polishing six surfaces of the glass melting furnace to prepare the heavy load-bearing brick for the bottom of the glass melting furnace.
Wherein:
the mass of the added water in the step (1) accounts for 5% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder, the high-alumina cement and the micro-silica powder.
The frequency of the high-frequency vibration in the step (1) is 105 times/minute, and the time is 30 min.
And (3) naturally curing for 48 hours at the temperature of 30 ℃ in the step (2).
Example 2
The novel large brick at the bottom of the glass melting furnace pool in the embodiment 2 is composed of a synthetic material, flint clay, chamotte, mullite fine powder, high alumina cement and silica fume, wherein the sum of the mass of the synthetic material, the flint clay, the chamotte, the mullite fine powder and the high alumina cement is 100%, wherein the synthetic material is 50%, the flint clay is 20%, the chamotte is 15%, the mullite fine powder is 10% and the high alumina cement is 5%; the mass of the micro silicon powder accounts for 3 percent of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
Wherein: the refractoriness of the refractory clay is 1750 ℃, and the refractory clay comprises the following chemical compositions: al (Al)2O3 39％、SiO256％、Fe2O3 1.2％、K2O+Na2O 1.7％、CaO 0.7％。
The granularity of the mullite fine powder is 180 um.
The high alumina cement is marked as CA 50-A900.
The chemical composition of the micro silicon powder is as follows: SiO 22 96％、Al2O3 1.1％、Fe2O3 0.6％、MgO 0.7％、CaO 0.3％、Na21.3 percent of O; the particle size is 0.2 um.
The synthetic material consists of 50 percent of bauxite, 45 percent of synthetic mullite and 5 percent of bonding agent in percentage by mass; the binding agent is lignin.
The preparation method of the synthetic material comprises the following steps: adding water into bauxite, synthetic mullite and a binding agent, mixing and molding by a wet method, extruding the mixture into a shaped block with a wavy groove on the upper surface, drying the shaped block into grey white at room temperature, drying the grey white at 80 ℃ for 48 hours in a drying chamber, placing the grey white in a kiln, calcining the grey white at 1410 ℃ for 72 hours, firing the grey white, and finally crushing the grey white into 5mm particles to obtain the synthetic material.
Wherein:
the mass of the added water accounts for 9 percent of the sum of the mass of the bauxite, the mass of the synthetic mullite and the mass of the bonding agent.
The size of the sizing block is 200x110x60 mm.
The preparation process of the novel glass melting furnace tank bottom large brick in the embodiment 2 comprises the following steps:
(1) preparing a blank body: completely mixing the synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement, micro silicon powder and water, pouring the mixture into a mold, and performing high-frequency vibration molding to obtain a blank;
(2) demolding and drying: the blank body is communicated with the die to be kept stand for 72 hours, and then is demoulded to carry out natural maintenance;
(3) putting the well-maintained blank into a drying chamber with the temperature of 85 ℃ for fully drying for 72 hours;
(4) high-temperature calcination: putting the dried blank in the step (3) into a high-temperature kiln, continuously heating to 500 ℃ within 72 hours, keeping the temperature for 24 hours, heating to 1050 ℃ within 68 hours, keeping the temperature for 40 hours, heating to 1420 ℃ within 48 hours, keeping the temperature for 20 hours, heating to 1500 ℃ within 15 hours, keeping the temperature for 10 hours, finally, carrying out step cooling annealing to 350 ℃ within 72 hours at the speed of 16 ℃/h, opening the kiln, cooling to room temperature, and finishing the calcination;
(5) polishing: cutting the glass melting furnace into proper sizes according to the design requirements of the melting furnace, and smoothly polishing six surfaces of the glass melting furnace to prepare the heavy load-bearing brick for the bottom of the glass melting furnace.
Wherein:
the mass of the added water in the step (1) accounts for 7% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder, the high-alumina cement and the micro-silica powder.
The frequency of the high-frequency vibration in the step (1) is 105 times/minute, and the time is 35 min.
And (3) naturally curing for 48 hours at the temperature of 30 ℃ in the step (2).
Example 3
The novel large brick at the bottom of the glass melting furnace pool in the embodiment 3 is composed of a synthetic material, flint clay, chamotte, mullite fine powder, high alumina cement and silica fume, wherein the sum of the mass of the synthetic material, the flint clay, the chamotte, the mullite fine powder and the high alumina cement is 100%, wherein the synthetic material is 55%, the flint clay is 18%, the chamotte is 12%, the mullite fine powder is 10% and the high alumina cement is 5%; the mass of the micro silicon powder accounts for 3 percent of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
Wherein: the refractoriness of the refractory clay is 1750 ℃, and the refractory clay comprises the following chemical compositions: al (Al)2O3 39％、SiO256％、Fe2O3 1.2％、K2O+Na2O 1.7％、CaO 0.7％。
The granularity of the mullite fine powder is 120 um.
The high alumina cement is marked as CA 50-A700.
The chemical composition of the micro silicon powder is as follows: SiO 22 96％、Al2O3 1.1％、Fe2O3 0.6％、MgO 0.7％、CaO 0.3％、Na21.3 percent of O; the particle size is 0.1 um.
The synthetic material consists of 53 percent of bauxite, 42 percent of synthetic mullite and 5 percent of bonding agent in percentage by mass; the binding agent is lignin.
The preparation method of the synthetic material comprises the following steps: adding water into bauxite, synthetic mullite and a binding agent, mixing and molding by a wet method, extruding the mixture into a shaped block with a wavy groove on the upper surface, drying the shaped block into grey white at room temperature, drying the grey white at 70 ℃ for 72 hours in a drying chamber, placing the grey white in a kiln, calcining the grey white at 1420 ℃ for 74 hours, and finally crushing the grey white into 3mm particles to prepare the synthetic material.
Wherein:
the mass of the added water accounts for 4 percent of the sum of the mass of the bauxite, the mass of the synthetic mullite and the mass of the bonding agent.
The size of the sizing block is 200x110x60 mm.
The preparation process of the novel glass melting furnace tank bottom large brick in the embodiment 3 comprises the following steps:
(1) preparing a blank body: completely mixing the synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement, micro silicon powder and water, pouring the mixture into a mold, and performing high-frequency vibration molding to obtain a blank;
(2) demolding and drying: the blank body is communicated with the die to be kept stand for 72 hours, and then is demoulded to carry out natural maintenance;
(3) putting the well-maintained blank into a drying chamber with the temperature of 55 ℃ for fully drying for 96 hours;
(4) high-temperature calcination: putting the dried green body obtained in the step (3) into a high-temperature kiln, continuously heating to 520 ℃ within 100h, keeping the temperature for 22h, heating to 1050 ℃ within 95h, keeping the temperature for 55h, heating to 1420 ℃ within 50h, keeping the temperature for 40h, heating to 1480 ℃ within 24h, keeping the temperature for 15h, finally, carrying out step cooling annealing to 510 ℃ within 44 h at the speed of 22 ℃/h, opening the kiln, cooling to room temperature, and finishing calcining;
(5) polishing: cutting the glass melting furnace into proper sizes according to the design requirements of the melting furnace, and smoothly polishing six surfaces of the glass melting furnace to prepare the heavy load-bearing brick for the bottom of the glass melting furnace.
Wherein:
the mass of the added water in the step (1) accounts for 10% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder, the high-alumina cement and the micro-silica powder.
The frequency of the high-frequency vibration in the step (1) is 105 times/minute, and the time is 40 min.
And (3) naturally curing for 48 hours at the temperature of 30 ℃ in the step (2).
Comparative example 1
The glass-melting furnace bottom brick of comparative example 1 is the same as example 1, except that the synthetic material in the raw material of example 1 is replaced by bauxite, namely: the large brick at the bottom of the glass melting furnace tank in the comparative example 1 is composed of bauxite, flint clay, refractory clay, mullite fine powder, high alumina cement and silica fume, wherein the mass sum of the bauxite, the flint clay, the refractory clay, the mullite fine powder and the high alumina cement is 100%, wherein the bauxite accounts for 60%, the flint clay accounts for 10%, the refractory clay accounts for 15%, the mullite fine powder accounts for 10%, and the high alumina cement accounts for 5%; the mass of the micro silicon powder accounts for 3 percent of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
Comparative example 2
The preparation method of the large brick at the bottom of the glass melting furnace pool in the comparative example 2 is the same as that in the example 1, and the only difference is that the large brick at the bottom of the glass melting furnace pool in the comparative example 2 consists of flint clay, fire clay, mullite fine powder, high alumina cement and micro silica powder, the mass sum of the flint clay, the fire clay, the mullite fine powder and the high alumina cement is 100%, wherein the flint clay is 70%, the fire clay is 15%, the mullite fine powder is 10% and the high alumina cement is 5%; the mass of the micro silicon powder accounts for 3 percent of the sum of the mass of the flint clay, the mass of the chamotte, the mass of the mullite fine powder and the mass of the high-alumina cement.
The glass melting furnace bottom bricks prepared in examples 1 to 3 and comparative examples 1 to 2 were subjected to the performance test, and the results are shown in Table 1:
TABLE 1 results of performance test of large bricks at the bottom of glass melting furnace
The 1400 ℃ X2H reburning line of the large brick at the bottom of the glass melting furnace prepared in the comparative example 1 is changed to 0.8%, so that the large brick is seriously expanded after the synthetic material is replaced by bauxite, the corner of the brick is easy to crack, and the glass melting furnace is damaged under the more serious condition, so that the large brick cannot be used.
The volume density and the apparent porosity are measured by adopting a GB/T2997-2015 test method for densely setting the refractory product; the normal temperature compressive strength is measured by a test method of the normal temperature compressive strength of a GB/T5072-2008 refractory material.
Of course, the foregoing is only a preferred embodiment of the invention and should not be taken as limiting the scope of the embodiments of the invention. The present invention is not limited to the above examples, and equivalent changes and modifications made by those skilled in the art within the spirit and scope of the present invention should be construed as being included in the scope of the present invention.
Claims (10)
1. The utility model provides a novel big brick of glass melting furnace bottom of pool which characterized in that: the composite material consists of a synthetic material, flint clay, mullite fine powder, high alumina cement and micro silica powder, wherein the mass sum of the synthetic material, the flint clay, the mullite fine powder and the high alumina cement is 100 percent, wherein the synthetic material accounts for 50 to 60 percent, the flint clay accounts for 10 to 20 percent, the fire clay accounts for 10 to 15 percent, the mullite fine powder accounts for 5 to 10 percent, and the high alumina cement accounts for 1 to 5 percent; the mass of the micro silicon powder accounts for 1-5% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder and the high-alumina cement.
2. The novel glass-melting furnace tank bottom big brick as claimed in claim 1, characterized in that: the refractoriness of the refractory clay is 1750 ℃, and the refractory clay comprises the following chemical compositions: al (Al)2O3 35-45％、SiO2 50-60％、Fe2O3 1.2-1.5％、K2O+Na2O1-2.5％、CaO 0.5-1.5％。
3. The novel glass-melting furnace tank bottom big brick as claimed in claim 1, characterized in that: the granularity of the mullite fine powder is 200-75 um.
4. The novel glass-melting furnace tank bottom big brick as claimed in claim 1, characterized in that: the high alumina cement is marked as CA50-A900 or CA 50-A700.
5. The novel glass-melting furnace tank bottom big brick as claimed in claim 1, characterized in that: the chemical composition of the micro silicon powder is as follows: SiO 22 75-98％、Al2O3 0.8-1.2％、Fe2O3 0.6-1.2％、MgO 0.6-0.8％、CaO 0.2-0.4％、Na21.1 to 1.5 percent of O; the granularity is 0.1-0.3 um.
6. The novel glass-melting furnace tank bottom big brick as claimed in claim 1, characterized in that: the synthetic material consists of 50-55% of bauxite, 40-45% of synthetic mullite and 5% of a bonding agent in percentage by mass; the binding agent is one of lignin or cyclodextrin.
7. The novel glass-melting furnace tank bottom big brick as claimed in any one of claims 1 or 6, characterized in that: the preparation method of the synthetic material comprises the following steps: adding water into bauxite, synthetic mullite and a binding agent, mixing and molding by a wet method, extruding the mixture into a shaped block with a wavy groove on the upper surface, drying the shaped block into grey white at room temperature, drying the grey white at 40-80 ℃ for 48-72 hours in a drying chamber, calcining the grey white at 1400-1420 ℃ for 72-74 hours after kiln loading, firing the grey white, and finally crushing the grey white into particles with the particle size of 3-5mm to prepare the synthetic material.
8. The new glass melter bottom brick as claimed in claim 7, wherein: the mass of the added water accounts for 4-9% of the sum of the mass of the bauxite, the synthetic mullite and the bonding agent.
9. The preparation process of the novel glass melting furnace tank bottom big brick as claimed in claim 1, which is characterized in that: the method comprises the following steps:
(1) preparing a blank body: completely mixing the synthetic material, flint clay, refractory clay, mullite fine powder, high-alumina cement, micro silicon powder and water, pouring the mixture into a mold, and performing high-frequency vibration molding to obtain a blank;
(2) demolding and drying: the blank body is communicated with the die to be kept stand for 72 hours, and then is demoulded to carry out natural maintenance;
(3) putting the well-maintained blank into a drying chamber with the temperature of 55-85 ℃ for fully drying for 72-96 hours;
(4) high-temperature calcination: placing the blank dried in the step (3) into a high-temperature kiln, continuously heating to 500-50 ℃ within 72-100h, keeping the temperature constant for 22-24h, heating to 1000-1050 ℃ within 65-95h, keeping the temperature constant for 40-55h, heating to 1400-1420 ℃ within 48-55h, keeping the temperature constant for 20-40h, heating to 1480-1500 ℃ within 15-24h, keeping the temperature constant for 10-15h, finally performing step cooling annealing to 510-100 ℃ within 44-72 h at the speed of 10-22 ℃/h, cooling to room temperature after opening the kiln, and finishing the calcination;
(5) polishing: cutting the glass melting furnace into proper sizes according to the design requirements of the melting furnace, and smoothly polishing six surfaces of the glass melting furnace to prepare the heavy load-bearing brick for the bottom of the glass melting furnace.
10. The process for preparing the novel glass melting furnace tank bottom big brick as claimed in claim 9, wherein the process comprises the following steps: the mass of the added water in the step (1) accounts for 5-10% of the sum of the mass of the synthetic material, the flint clay, the refractory clay, the mullite fine powder, the high-alumina cement and the micro-silica powder;
the frequency of the high-frequency vibration in the step (1) is 100-;
and (3) naturally curing for 24-48h at 15-30 ℃ in the step (2).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213951A (en) * | 2021-03-31 | 2021-08-06 | 江苏长城窑炉工程有限公司 | Fused quartz cover plate brick for material channel of glass kiln |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480416A (en) * | 2002-09-05 | 2004-03-10 | 吕志乾 | Bottom brick in tin pot |
| CN111440003A (en) * | 2020-04-07 | 2020-07-24 | 山东淄博沈淄耐火材料有限公司 | Bottom brick special for high-temperature section of tin bath of novel float glass kiln and preparation method thereof |
| CN113480301A (en) * | 2021-07-15 | 2021-10-08 | 山东淄博沈淄耐火材料有限公司 | Preparation method of large brick at bottom of high-temperature sillimanite pool of large float glass melting furnace |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1480416A (en) * | 2002-09-05 | 2004-03-10 | 吕志乾 | Bottom brick in tin pot |
| CN111440003A (en) * | 2020-04-07 | 2020-07-24 | 山东淄博沈淄耐火材料有限公司 | Bottom brick special for high-temperature section of tin bath of novel float glass kiln and preparation method thereof |
| CN113480301A (en) * | 2021-07-15 | 2021-10-08 | 山东淄博沈淄耐火材料有限公司 | Preparation method of large brick at bottom of high-temperature sillimanite pool of large float glass melting furnace |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113213951A (en) * | 2021-03-31 | 2021-08-06 | 江苏长城窑炉工程有限公司 | Fused quartz cover plate brick for material channel of glass kiln |
| CN113213951B (en) * | 2021-03-31 | 2023-08-01 | 江苏长城窑炉工程有限公司 | Glass kiln material channel fused quartz cover plate brick |
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