CN115321970B - Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method of andalusite-hercynite composite brick - Google Patents

Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method of andalusite-hercynite composite brick Download PDF

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CN115321970B
CN115321970B CN202211051645.9A CN202211051645A CN115321970B CN 115321970 B CN115321970 B CN 115321970B CN 202211051645 A CN202211051645 A CN 202211051645A CN 115321970 B CN115321970 B CN 115321970B
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andalusite
granularity
hercynite
composite brick
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CN115321970A (en
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刘昭
毛恩亮
徐如林
翟耀杰
刘威
吕宝磊
周珍妮
任向阳
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Henan Ruitai Fireproof Material Technology Co ltd
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Abstract

The invention discloses a andalusite-hercynite composite brick for a zinc volatilization rotary kiln and a preparation method thereof. The composite brick is prepared from andalusite with raw material granularity of 5-3 mm, andalusite with granularity of 3-1 mm, andalusite with granularity of 1-0 mm, andalusite with granularity of less than 0.088mm, electric melting hercynite with granularity of 5-0 mm, electric melting hercynite with granularity of less than 0.088mm and alpha-Al with granularity of less than 0.044mm 2 O 3 The fine powder consists of fine powder of kaolin with the granularity smaller than 0.044 mm. Mixing the prepared aggregate, adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding, and then adding fine powder for continuous mixing and grinding to obtain a mixed material; forming the mixed material into a green brick; and (5) sequentially drying and sintering the green bricks at high temperature to obtain the andalusite-hercynite composite brick. The product obtained by the invention is used for a high-temperature zone of a zinc volatilizing rotary kiln, and can replace magnesia-alumina-chrome bricks and chrome corundum bricks which are polluted and have higher price.

Description

Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method of andalusite-hercynite composite brick
1. Technical field:
the invention relates to the field of refractory materials, in particular to a andalusite-hercynite composite brick for a zinc volatilization rotary kiln and a preparation method thereof.
2. The background technology is as follows:
andalusite is an island-shaped anhydrous silicate mineral, has the advantages of high mechanical strength, high temperature resistance, high thermal shock stability and the like, and is widely applied to the industry as a raw material of high-grade refractory materials. It is particularly notable that it is chemically stable and resistant to chemical attack.
The electrofusion hercynite is prepared by adopting high-quality alumina and iron-containing compounds through high-temperature refining, and also belongs to artificially synthesized spinel, and is environment-friendly and pollution-free. Has excellent thermal shock resistance and alkaline slag corrosion resistance, and can be compounded with a plurality of refractory raw materials to obtain better comprehensive performance.
α-Al 2 O 3 The high-temperature-resistant ceramic material has the advantages of uniform particle size distribution, high purity, high temperature-resistant inertia, good formability, stable crystalline phase, good dimensional stability and the like, is widely applied to reinforcing and toughening of refractory materials, and particularly has obvious creep resistance and wear resistance.
The kaolin is an advantageous mineral product in China, has excellent plasticity and sintering promotion property, is high in quality and low in cost, and accords with the development route of high-grade refractory materials with high production cost performance in China.
The invention adopts andalusite and electric melting hercynite as main raw materials and is prepared by high-temperature sintering, and impurity components such as TiO 2 、K 2 O、Na 2 O, caO, etc., the lower impurity content ensures excellent high temperature performance. The chromium-free raw material is adopted for synthesis, so that hazardous waste can be prevented from being generated in the later period, environmental pollution is prevented, and the social environment-friendly effect is remarkable.
In the zinc smelting industry in China, a zinc volatilization rotary kiln is the most important high-temperature equipment. The device reduces and gasifies zinc, and then condenses zinc steam to obtain metallic zinc. In the reaction process, the temperature of the high temperature zone in the kiln is 1000-1300 ℃ due to the oxidation of zinc steam and the combustion of the reducing agent. The high-temperature zone of the rotary kiln has intense and complex physicochemical reaction, and the thermal stress effect is obvious because of factors such as rotation of the rotary kiln, so that the service life of the region with the most serious erosion of the refractory material in the kiln is directly related to the service life of the whole kiln.
The high-temperature belt brick of the zinc volatilization rotary kiln needs to have good thermal shock resistance and strength under the comprehensive working condition so as to ensure the structural integrity under the thermal shock effect. Meanwhile, the material has strong chemical resistance, so that the material is not damaged by chemical corrosion in the process of reducing reaction of the raw material, and the service time is ensured.
In the current application, magnesia-alumina-chrome bricks and chrome corundum bricks are mainly adopted. The two products have the advantages of excellent high-temperature performance, good anti-scouring erosion performance and the like, and the products are used up to now. However, the problem of chromium pollution is not thoroughly solved, the used waste bricks can only be piled up for a long time and become dangerous waste, and the environmental protection pressure is very high; meanwhile, the thermal shock stability of the chrome corundum brick is poor, the brick can be bounced by slight fluctuation of kiln opening temperature rise, the danger is very high, and the service cycle of a newly built kiln is difficult to ensure; the magnesia-alumina-chrome brick has large linear change rate, extremely serious bursting head phenomenon in the heating process, easy hydration, high storage and kiln drying difficulty and limited operation safety and service life extension.
3. The invention comprises the following steps:
the invention aims to solve the technical problems that: according to the defects of the high-temperature belt brick used in the current zinc volatilization rotary kiln, the invention provides a andalusite-hercynite composite brick for the zinc volatilization rotary kiln and a preparation method thereof. The andalusite-hercynite composite brick prepared by the technical scheme of the invention has the characteristics of excellent high-temperature physical and chemical stability, high thermal shock stability, excellent erosion and washing resistance, small linear change rate, no hydration, convenient manufacture, high qualification rate and the like, can be used for a high-temperature zone of a zinc volatilizing rotary kiln, has small thermal expansion of a kiln, stable kiln frame, can not collapse bricks or 'bursting heads', has high safety performance, and can replace magnesia-alumina chrome bricks (easy hydration) and chrome corundum bricks which are polluted and have high price.
In order to solve the problems, the invention adopts the following technical scheme:
the invention provides a andalusite-hercynite composite brick for a zinc volatilizing rotary kiln, which comprises the following raw materials in percentage by weight: 25-45% of andalusite with granularity of 5-3 mm, 15-35% of andalusite with granularity of 3-1 mm, 10-20% of andalusite with granularity of 1-0 mm, 10-20% of andalusite with granularity of less than 0.088mm, 3-15% of electric smelting iron-aluminum spinel with granularity of 5-0 mm, 3-15% of electric smelting iron-aluminum spinel with granularity of less than 0.088mm, and alpha-Al with granularity of less than 0.044mm 2 O 3 1 to 4 percent of micropowder and 1 to 2 percent of kaolin fine powder with granularity smaller than 0.044 mm; in addition, the binding agent aluminum dihydrogen phosphate solution accounting for 2 to 5 percent of the total weight of the raw materials is addedAnd (3) liquid.
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the main component of andalusite and the weight percentage of the andalusite are Al 2 O 3 ≥58％、TiO 2 ≤0.35％、K 2 O+Na 2 O is less than or equal to 0.5 percent (the andalusite adopts high-grade raw materials with low titanium and low potassium and sodium).
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the main component of the electric smelting hercynite and the weight percentage content of the electric smelting hercynite are Fe 2 O 3 ≥40％、Al 2 O 3 ≥40％。
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the alpha-Al 2 O 3 Al in the micropowder 2 O 3 The weight percentage content is more than or equal to 99 percent.
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the main component of the kaolin and the weight percentage of the kaolin are SiO 2 ≥40％、Al 2 O 3 ≥38％。
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the specific gravity of the aluminum dihydrogen phosphate solution is 1.32-1.55 g/cm 3 。
In addition, the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln comprises the following steps of:
a. proportioning according to the proportion of the raw materials of the andalusite-hercynite composite brick;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 3-8 min; adding the prepared fine powder, and continuing mixing and grinding for 10-20 min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm and electric melting hercynite with the granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, electric melting hercynite with granularity less than 0.088mm, and electric melting hercynite with granularity less than 0.044mm alpha-Al 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixture obtained in the step b under the pressure of 250-300 Mpa, and controlling the volume density of the molded green brick to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 105-140 ℃ for 24-72 h; and (3) drying, then, feeding the dried product into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1400-1650 ℃, the heat preservation time is 8-12 h, and the product of andalusite-hercynite composite brick is obtained after sintering.
The invention has the positive beneficial effects that:
1. according to the technical scheme, the andalusite raw material has the properties of high strength, high temperature resistance, high thermal shock stability, high chemical resistance and the like. Therefore, andalusite raw materials are used as aggregate in the formula of the product, so that the service life of the material of the product under the severe working condition of a zinc volatilizing kiln can be ensured, the phenomena that the existing magnesia-alumina-chrome is easy to hydrate and the brick is fried during the baking of the chrome corundum brick are particularly avoided, and the quality and safety accidents are avoided.
2. In the technical scheme of the invention, the adopted electric melting iron aluminum spinel has the properties of large volume density, small apparent porosity, large intercrystalline interlacing force and the like, and the high-temperature performance and the volume stability of the product can be greatly improved by introducing the electric melting iron aluminum spinel into the raw material proportion of the invention, and meanwhile, the thermal shock stability and the erosion and penetration resistance of the product are improved.
3. In the technical proposal of the invention, the andalusite and the electric melting hercynite are selected as main raw materials to be sintered at high temperature, and the impurity components such as TiO 2 、K 2 O、NaO 2 The content of CaO and the like is extremely low, and the lower impurity content ensures excellent high-temperature performance. The chromium-free raw material is adopted for synthesis, so that hazardous waste in the later stage can be prevented, and environmental pollution is prevented. Therefore, the social environment-friendly effect is remarkable.
4. The andalusite-hercynite composite brick prepared by the technical scheme of the invention has the properties of high strength, high temperature resistance, strong thermal shock stability, strong chemical resistance and the like, and is listed as follows in table 1.
TABLE 1 data of the performance tests of the andalusite-hercynite composite bricks obtained by the preparation of the invention
Bulk Density (g/cm) 3 ) 2.90
Apparent porosity (%) 16.8
The temperature is kept for 6 hours (%) -0.08
Compressive Strength/MPa 96
Normal temperature flexural strength/MPa 13.5
Softening temperature under load (T) 0.6 ℃) ≥1700
Thermal shock stability/1100 ℃ water cooling (secondary) ≥30
Resistance to zinc slag erosion in reducing atmosphere Excellent in
To sum up: the invention adopts the red with strong chemical stabilityThe colpite is taken as a main raw material, and the electric melting iron aluminum spinel is simultaneously introduced, and the alpha-Al is added 2 O 3 Micropowder and kaolin fine powder. Through optimizing the components, the chemical erosion resistance, thermal shock stability and strength of the product are improved. The andalusite-hercynite composite brick prepared by the method has the characteristics of excellent high-temperature physical and chemical stability, high thermal shock stability, excellent erosion and scouring resistance, small linear change rate, no hydration, convenient manufacture, high qualification rate and the like, is used for a high-temperature zone of a zinc volatilization rotary kiln, avoids the phenomena of easy hydration of magnesia-alumina-chromite and brick explosion during the baking of the chrome corundum brick, and avoids quality and safety accidents; meanwhile, the composite material can replace magnesia-alumina-chrome bricks and chrome corundum bricks which are polluted and have high price, can prevent hazardous waste from being generated in the later period, prevent environmental pollution, has obvious social and environmental protection effects and has profound significance.
4. The specific embodiment is as follows:
the present invention will be described in further detail with reference to the following specific examples, but the scope of the technical solution of the present invention is not limited thereto.
In the embodiment of the invention, the main component of the andalusite is Al in percentage by weight 2 O 3 ≥58％、TiO 2 ≤0.35％、K 2 O+Na 2 O is less than or equal to 0.5 percent (the andalusite adopts high-grade raw materials with low titanium and low potassium and sodium), and the main component and the weight percentage of the electric melting iron-aluminum spinel are Fe 2 O 3 ≥40％、Al 2 O 3 ≥40％，α-Al 2 O 3 Al in the micropowder 2 O 3 The weight percentage of the main component in the kaolin is more than or equal to 99 percent and the weight percentage of the main component in the kaolin is SiO 2 ≥40％、Al 2 O 3 More than or equal to 38 percent. The specific gravity of the aluminum dihydrogen phosphate solution is 1.32-1.55 g/cm 3 。
Example 1:
the andalusite-hercynite composite brick for the zinc volatilizing rotary kiln comprises the following raw materials in percentage by weight: andalusite with granularity of 5-3 mm, andalusite with granularity of 3-1 mm, andalusite with granularity of 1-0 mm, andalusite with granularity of 14% and andalusite with granularity of less than 0.088mm20 percent of electric melting hercynite with the granularity of 5-0 mm, 5 percent of electric melting hercynite with the granularity of less than 0.088mm, 3 percent of electric melting hercynite with the granularity of less than 0.044mm and alpha-Al 2 O 3 2% of micropowder and 1% of kaolin fine powder with the granularity smaller than 0.044 mm; in addition, a binder aluminum dihydrogen phosphate solution (the specific gravity of the aluminum dihydrogen phosphate solution is 1.45 g/cm) accounting for 3 percent of the total weight of the raw materials is added 3 )。
Example 2:
the andalusite-hercynite composite brick for the zinc volatilizing rotary kiln comprises the following raw materials in percentage by weight: 30% of andalusite with granularity of 5-3 mm, 20% of andalusite with granularity of 3-1 mm, 13% of andalusite with granularity of 1-0 mm, 20% of andalusite with granularity of less than 0.088mm, 4% of electric smelting iron-aluminum spinel with granularity of 5-0 mm, 7% of electric smelting iron-aluminum spinel with granularity of less than 0.088mm and alpha-Al with granularity of less than 0.044mm 2 O 3 4% of micropowder and 2% of kaolin fine powder with the granularity smaller than 0.044 mm; in addition, a binder aluminum dihydrogen phosphate solution (the specific gravity of the aluminum dihydrogen phosphate solution is 1.35 g/cm) accounting for 3.5 percent of the total weight of the raw materials is added 3 )。
Example 3:
the andalusite-hercynite composite brick for the zinc volatilizing rotary kiln comprises the following raw materials in percentage by weight: 28% of andalusite with granularity of 5-3 mm, 17% of andalusite with granularity of 3-1 mm, 20% of andalusite with granularity of 1-0 mm, 15% of andalusite with granularity of less than 0.088mm, 5% of electric smelting iron-aluminum spinel with granularity of 5-0 mm, 10% of electric smelting iron-aluminum spinel with granularity of less than 0.088mm and alpha-Al with granularity of less than 0.044mm 2 O 3 3% of micropowder and 2% of kaolin fine powder with the granularity smaller than 0.044 mm; in addition, a binder aluminum dihydrogen phosphate solution (the specific gravity of the aluminum dihydrogen phosphate solution is 1.32 g/cm) accounting for 4 percent of the total weight of the raw materials is added 3 )。
Example 4:
the andalusite-hercynite composite brick for the zinc volatilizing rotary kiln comprises the following raw materials in percentage by weight: granules and method for producing the same30% of andalusite with the degree of 5-3 mm, 17% of andalusite with the granularity of 3-1 mm, 20% of andalusite with the granularity of 1-0 mm, 18% of andalusite with the granularity of less than 0.088mm, 10% of electric melting hercynite with the granularity of 5-0 mm, 3% of electric melting hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 1% of micropowder and 1% of kaolin fine powder with the granularity smaller than 0.044 mm; in addition, a binder aluminum dihydrogen phosphate solution (the specific gravity of the aluminum dihydrogen phosphate solution is 1.52 g/cm) accounting for 3.0 percent of the total weight of the raw materials is added 3 )。
Example 5:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln disclosed by the embodiment of the invention comprises the following detailed steps of:
a. proportioning the raw materials of the andalusite-hercynite composite brick according to the proportion of the raw materials of the andalusite-hercynite composite brick in the embodiment 1;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 5min; adding the prepared fine powder, and continuously carrying out mixing grinding for 15min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm and electric melting hercynite with the granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, electric melting hercynite with granularity less than 0.088mm, alpha-Al with granularity less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixed material obtained in the step b under the pressure of 250Mpa by adopting a hydraulic brick press, and controlling the volume density of the molded green brick to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 120 ℃ for 24 hours; and (3) drying, and then sending the dried product into a high-temperature tunnel kiln for sintering at a sintering temperature of 1450 ℃ for 8 hours, thereby obtaining the andalusite-hercynite composite brick.
The data of the performance test on the product andalusite-hercynite composite brick prepared in this example are shown in table 2.
Table 2 data for testing the properties of the andalusite-hercynite composite bricks obtained in example 5
Bulk Density (g/cm) 3 ) 2.75
Apparent porosity (%) 18.3
The temperature is kept for 6 hours (%) -0.1
Compressive Strength/MPa 76
Normal temperature flexural strength/MPa 9.8
Softening temperature under load (T) 0.6 ℃) 1610
Thermal shock stability/1100 ℃ water cooling (secondary) ≥30
Resistance to zinc slag erosion in reducing atmosphere Excellent in
Example 6:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln disclosed by the embodiment 2 comprises the following detailed steps:
a. proportioning the raw materials of the andalusite-hercynite composite brick according to the proportion of the raw materials of the andalusite-hercynite composite brick in the embodiment 2;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 8min; adding the prepared fine powder, and continuously carrying out mixing grinding for 15min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm and electric melting hercynite with the granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, electric melting hercynite with granularity less than 0.088mm, alpha-Al with granularity less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixed material obtained in the step b under the pressure of 300Mpa by adopting a hydraulic brick press, wherein the volume density of the molded green brick is controlled between 2.8 and 3.0g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 120 ℃ for 36 hours; and (3) drying, and then sending the dried product into a high-temperature tunnel kiln for sintering at a sintering temperature of 1500 ℃, and preserving heat for 10 hours at the sintering temperature to obtain the andalusite-hercynite composite brick.
The data of the performance test on the product andalusite-hercynite composite brick prepared in this example are shown in Table 3.
Table 3 data for testing the properties of the andalusite-hercynite composite bricks obtained in example 6
Bulk Density (g/cm) 3 ) 2.78
Apparent porosity (%) 17.9
The temperature is kept for 6 hours (%) -0.1
Compressive Strength/MPa 81
Normal temperature flexural strength/MPa 10.3
Softening temperature under load (T) 0.6 ℃) 1632
Thermal shock stability/1100 ℃ water cooling (secondary) ≥30
Resistance to zinc slag erosion in reducing atmosphere Excellent in
Example 7:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln disclosed by the embodiment of the invention comprises the following detailed steps of:
a. proportioning the raw materials of the andalusite-hercynite composite brick according to the proportion of the raw materials of the andalusite-hercynite composite brick in the embodiment 3;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 6min; adding the prepared fine powder, and continuously carrying out mixing grinding for 18min to obtain a mixed material;
the aggregate is andalusite with granularity of 5-3 mm and andalusite with granularity of 3-1 mmAndalusite with granularity of 1-0 mm and electric smelting iron aluminum spinel with granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, electric melting hercynite with granularity less than 0.088mm, alpha-Al with granularity less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixed material obtained in the step b under the pressure of 290Mpa by adopting a hydraulic brick press, and controlling the volume density of the molded green brick to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 120 ℃ for 72 hours; and (3) drying, and then sending the dried product into a high-temperature tunnel kiln for sintering at a sintering temperature of 1600 ℃, and preserving heat for 12 hours at the sintering temperature to obtain the andalusite-hercynite composite brick.
The data of the performance test on the product andalusite-hercynite composite brick prepared in this example are shown in Table 4.
Table 4 data for testing the properties of the andalusite-hercynite composite bricks obtained in example 7
Bulk Density (g/cm) 3 ) 2.85
Apparent porosity (%) 17.5
The temperature is kept for 6 hours (%) -0.09
Compressive Strength/MPa 85
Normal temperature resistanceFlexural Strength/MPa 11.6
Softening temperature under load (T) 0.6 ℃) 1650
Thermal shock stability/1100 ℃ water cooling (secondary) ≥30
Resistance to zinc slag erosion in reducing atmosphere Excellent in
Example 8:
the method for preparing the andalusite-hercynite composite brick for the zinc volatilization rotary kiln disclosed by the embodiment 4 comprises the following detailed steps:
a. proportioning the raw materials of the andalusite-hercynite composite brick according to the proportion of the raw materials of the andalusite-hercynite composite brick in the embodiment 4;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 5min; adding the prepared fine powder, and continuously carrying out mixing grinding for 15min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm and electric melting hercynite with the granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, electric melting hercynite with granularity less than 0.088mm, alpha-Al with granularity less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixed material obtained in the step b under the pressure of 300Mpa by adopting a hydraulic brick press, wherein the volume density of the molded green brick is controlled between 2.8 and 3.0g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 120 ℃ for 48 hours; and (3) drying, and then sending the dried product into a high-temperature tunnel kiln for sintering at a sintering temperature of 1650 ℃ and preserving heat for 10 hours at the sintering temperature to obtain the andalusite-hercynite composite brick.
The data of the performance test on the product andalusite-hercynite composite brick prepared in this example are shown in Table 5.
TABLE 5 data for testing the properties of the resulting fuchsin-hercynite composite bricks prepared in this example
Bulk Density (g/cm) 3 ) 2.90
Apparent porosity (%) 16.8
The temperature is kept for 6 hours (%) -0.08
Compressive Strength/MPa 96
Normal temperature flexural strength/MPa 13.5
Softening temperature under load (T) 0.6 ℃) ≥1700
Thermal shock stability/1100 ℃ water cooling (secondary) ≥30
Resistance to zinc slag erosion in reducing atmosphere Excellent in
。

Claims (4)

1. The andalusite-hercynite composite brick for the zinc volatilizing rotary kiln is characterized by comprising the following raw materials in percentage by weight: 25-45% of andalusite with granularity of 5-3 mm, 15-35% of andalusite with granularity of 3-1 mm, 10-20% of andalusite with granularity of 1-0 mm, 10-20% of andalusite with granularity of less than 0.088mm, 3-15% of electric smelting iron-aluminum spinel with granularity of 5-0 mm, 3-15% of electric smelting iron-aluminum spinel with granularity of less than 0.088mm, and alpha-Al with granularity of less than 0.044mm 2 O 3 1 to 4 percent of micropowder and 1 to 2 percent of kaolin fine powder with granularity smaller than 0.044 mm; in addition, adding a binding agent aluminum dihydrogen phosphate solution accounting for 2-5 percent of the total weight of the raw materials;
the andalusite comprises the main components in percentage by weight of Al 2 O 3 ≥58%、TiO 2 ≤0.35%、K 2 O+Na 2 O is less than or equal to 0.5 percent; the main component of the electric melting iron aluminum spinel is Fe in percentage by weight 2 O 3 ≥40%、 Al 2 O 3 ≥40%；
The andalusite-hercynite composite brick for the zinc volatilization rotary kiln is prepared by the following method:
a. proportioning according to the proportion of the raw materials of the andalusite-hercynite composite brick;
b. mixing the prepared aggregate, adding the mixture into a wet mill, and adding a binding agent aluminum dihydrogen phosphate solution for mixing and grinding for 3-8 min; adding the prepared fine powder, and continuing mixing and grinding for 10-20 min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm and electric melting hercynite with the granularity of 5-0 mm; the fine powder is andalusite with granularity less than 0.088mm, and electric melting hercynite with granularity less than 0.088mmalpha-Al with a degree of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. molding the mixture obtained in the step b under the pressure of 250-300 MPa, and controlling the volume density of the molded green brick to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln with the temperature of 105-140 ℃ for 24-72 h; and (3) drying, then, feeding the dried product into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1400-1650 ℃, the heat preservation time is 8-12 h, and the product of andalusite-hercynite composite brick is obtained after sintering.
2. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln according to claim 1, wherein: the alpha-Al 2 O 3 Al in the micropowder 2 O 3 The weight percentage content is more than or equal to 99 percent.
3. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln according to claim 1, wherein: the main component of the kaolin is SiO in weight percentage 2 ≥40%、Al 2 O 3 ≥38%。
4. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln according to claim 1, wherein: the specific gravity of the aluminum dihydrogen phosphate solution is 1.32-1.55 g/cm 3 。
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* Cited by examiner, † Cited by third party
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JPH061675A (en) * 1992-06-19 1994-01-11 Oomura Taika Kk Manufacture of insulating fire-resisting sintered compact
CN102101779A (en) * 2010-12-10 2011-06-22 河南瑞泰耐火材料科技有限公司 Pleonaste-hercynite bricks and preparation method thereof
CN106145976A (en) * 2016-07-04 2016-11-23 瑞泰科技股份有限公司 Cement kiln andalusite mullite silicon carbide brick and preparation method thereof
CN106495719A (en) * 2016-11-07 2017-03-15 马鞍山钢铁股份有限公司 A kind of preparation method of coke dry quenching furnace chute bracket pillar brick
CN108017398A (en) * 2016-10-28 2018-05-11 河南智联寰宇知识产权运营有限公司 Refractory brick containing metakaolin and preparation method thereof
CN112341177A (en) * 2020-09-28 2021-02-09 山东耐材集团鲁耐窑业有限公司 Corrosion-resistant compact lattice brick for upper part of coke oven regenerator and preparation method thereof
CN114057498A (en) * 2021-11-24 2022-02-18 北京金隅通达耐火技术有限公司 Anti-erosion zirconium-containing andalusite brick and preparation method thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH061675A (en) * 1992-06-19 1994-01-11 Oomura Taika Kk Manufacture of insulating fire-resisting sintered compact
CN102101779A (en) * 2010-12-10 2011-06-22 河南瑞泰耐火材料科技有限公司 Pleonaste-hercynite bricks and preparation method thereof
CN106145976A (en) * 2016-07-04 2016-11-23 瑞泰科技股份有限公司 Cement kiln andalusite mullite silicon carbide brick and preparation method thereof
CN108017398A (en) * 2016-10-28 2018-05-11 河南智联寰宇知识产权运营有限公司 Refractory brick containing metakaolin and preparation method thereof
CN106495719A (en) * 2016-11-07 2017-03-15 马鞍山钢铁股份有限公司 A kind of preparation method of coke dry quenching furnace chute bracket pillar brick
CN112341177A (en) * 2020-09-28 2021-02-09 山东耐材集团鲁耐窑业有限公司 Corrosion-resistant compact lattice brick for upper part of coke oven regenerator and preparation method thereof
CN114057498A (en) * 2021-11-24 2022-02-18 北京金隅通达耐火技术有限公司 Anti-erosion zirconium-containing andalusite brick and preparation method thereof

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Denomination of invention: A composite brick of andalusite iron aluminum spinel for zinc volatilization rotary kiln and its preparation method

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