CN115321970A - Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method thereof - Google Patents
Andalusite-hercynite composite brick for zinc volatilization rotary kiln and preparation method thereof Download PDFInfo
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- CN115321970A CN115321970A CN202211051645.9A CN202211051645A CN115321970A CN 115321970 A CN115321970 A CN 115321970A CN 202211051645 A CN202211051645 A CN 202211051645A CN 115321970 A CN115321970 A CN 115321970A
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- hercynite
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- 239000011449 brick Substances 0.000 title claims abstract description 95
- 229910001691 hercynite Inorganic materials 0.000 title claims abstract description 88
- 239000002131 composite material Substances 0.000 title claims abstract description 54
- 239000011701 zinc Substances 0.000 title claims abstract description 43
- 229910052725 zinc Inorganic materials 0.000 title claims abstract description 43
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 229910052849 andalusite Inorganic materials 0.000 claims abstract description 60
- 239000002245 particle Substances 0.000 claims abstract description 39
- 239000000843 powder Substances 0.000 claims abstract description 37
- 238000002156 mixing Methods 0.000 claims abstract description 28
- 238000001035 drying Methods 0.000 claims abstract description 23
- 238000005245 sintering Methods 0.000 claims abstract description 21
- RGPUVZXXZFNFBF-UHFFFAOYSA-K diphosphonooxyalumanyl dihydrogen phosphate Chemical compound [Al+3].OP(O)([O-])=O.OP(O)([O-])=O.OP(O)([O-])=O RGPUVZXXZFNFBF-UHFFFAOYSA-K 0.000 claims abstract description 20
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 18
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 18
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims abstract description 17
- 238000000465 moulding Methods 0.000 claims abstract description 17
- 239000011230 binding agent Substances 0.000 claims abstract description 10
- 238000000227 grinding Methods 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims description 35
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 13
- 239000000203 mixture Substances 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 7
- 238000003801 milling Methods 0.000 claims description 6
- 229910010413 TiO 2 Inorganic materials 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 238000004321 preservation Methods 0.000 claims description 5
- 239000007767 bonding agent Substances 0.000 claims description 3
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 2
- 229910052593 corundum Inorganic materials 0.000 abstract description 7
- 239000010431 corundum Substances 0.000 abstract description 7
- 230000035939 shock Effects 0.000 description 16
- 239000000126 substance Substances 0.000 description 12
- 230000008859 change Effects 0.000 description 8
- 230000007797 corrosion Effects 0.000 description 8
- 238000005260 corrosion Methods 0.000 description 8
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 7
- 230000003628 erosive effect Effects 0.000 description 7
- 229910052804 chromium Inorganic materials 0.000 description 6
- 239000011651 chromium Substances 0.000 description 6
- 239000011819 refractory material Substances 0.000 description 6
- 239000002893 slag Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 5
- 239000011734 sodium Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000001514 detection method Methods 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 4
- 238000004880 explosion Methods 0.000 description 4
- 230000036571 hydration Effects 0.000 description 4
- 238000006703 hydration reaction Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000002920 hazardous waste Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003303 reheating Methods 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 2
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 2
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- -1 magnesium-aluminum-chromium Chemical compound 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 229910052700 potassium Inorganic materials 0.000 description 2
- 239000011591 potassium Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012797 qualification Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 229910052604 silicate mineral Inorganic materials 0.000 description 1
- 229910052596 spinel Inorganic materials 0.000 description 1
- 239000011029 spinel Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000008646 thermal stress Effects 0.000 description 1
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- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
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Abstract
The invention discloses an andalusite-hercynite composite brick for a zinc volatilization rotary kiln and a preparation method thereof. The composite brick is prepared from andalusite with the granularity of 5-3 mm, andalusite with the granularity of 3-1 mm, andalusite with the granularity of 1-0 mm, andalusite with the granularity of less than 0.088mm, electrically fused hercynite with the granularity of 5-0 mm, electrically fused hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 The fine powder and kaolin fine powder with the particle size less than 0.044 mm. Mixing the prepared aggregates, adding a binding agent aluminum dihydrogen phosphate solution, mixing and grinding, adding fine powder, and continuously mixing and grinding to obtain a mixed material; molding the mixed material into a green brick; and sequentially drying and sintering the green brick at high temperature to obtain the andalusite-hercynite composite brick. The product obtained by the invention is used for zincThe high-temperature zone of the volatilization rotary kiln can replace the pollution and high-price magnesia-alumina-chrome bricks and chrome-corundum bricks.
Description
1. The technical field is as follows:
the invention relates to the field of refractory materials, in particular to an andalusite-hercynite composite brick for a zinc volatilization rotary kiln and a preparation method thereof.
2. Background art:
andalusite is an island-shaped anhydrous silicate mineral, has excellent performances of high mechanical strength, high temperature resistance, strong thermal shock stability and the like, is used as a high-grade refractory material raw material, and has wide application in the industry. Particularly, the chemical stability and chemical resistance are high.
The fused hercynite is prepared by high-temperature refining of high-quality alumina and iron-containing compounds, 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 product has the advantages of uniform particle size distribution, high purity, high temperature resistance, inertia, good formability, stable crystal phase, good size stability and the like, is widely applied to reinforcement and toughening of refractory materials, and particularly has remarkable improvement on creep resistance and wear resistance of the refractory materials.
The kaolin is a dominant mineral product in China, has excellent plasticity and sintering promotion property, is high in quality and low in price, and accords with the development route of producing high-grade refractory materials with high cost performance in China.
The andalusite and the electric smelting hercynite selected by the invention are used as main raw materials and are sintered at high temperature to prepare the high-temperature-resistant material, and impurity components such as TiO 2 、K 2 O、Na 2 O, caO and the like, and the lower impurity content ensures excellent high temperature performance. The chromium-free raw material is adopted for synthesis, so that hazardous waste generated in the later period can be prevented, the environmental pollution is prevented, and the social environmental protection effect is obvious.
In the zinc smelting industry of China, a zinc volatilization rotary kiln is the most important high-temperature equipment. The equipment reduces and gasifies zinc and then condenses zinc vapor 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 physicochemical reaction of the high-temperature zone of the rotary kiln is violent and complex, and the action of thermal stress is obvious due to factors such as the rotation of the rotary kiln, so that the service life of the refractory material in the most serious area of the kiln is directly related to the service life of the whole kiln.
Under comprehensive working conditions, the high-temperature zone brick of the zinc volatilization rotary kiln needs to have good thermal shock resistance and strength so as to ensure the structural integrity of the high-temperature zone brick under the action of thermal shock. Meanwhile, the material should have strong chemical corrosion resistance, so that the material is not damaged by chemical corrosion in the reduction reaction process, 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, strong erosion resistance and the like, and are used up to now. But the problem of chromium pollution can not be thoroughly solved all the time, the used waste bricks can only be piled in circles for a long time and become dangerous waste, and the environmental protection pressure is very large; meanwhile, the chromium corundum bricks have poor thermal shock stability, the bricks can be extruded and bounced when the kiln is opened and the temperature rises slightly, so that the method is very dangerous, and particularly the service cycle of a newly-built kiln is difficult to guarantee; the linear change rate of the magnesia-alumina-chrome brick is large, the phenomenon of head explosion in the temperature rise process is very serious, and in addition, the magnesia-alumina-chrome brick is easy to hydrate and has high difficulty in storage and kiln drying, thereby restricting the operation safety and prolonging the service life.
3. The invention content is as follows:
the technical problem to be solved by the invention is as follows: according to the defects of the high-temperature zone brick used by the conventional zinc volatilization rotary kiln, the invention provides an 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 scouring 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 volatilization rotary kiln, has small thermal expansion of a drying kiln, stable kiln frame, no extrusion and collapse of bricks or 'explosion heads', has high safety performance, and can replace the magnesium-aluminum-chromium bricks (easy to hydrate) and chromium-corundum bricks which have pollution and higher price.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides an andalusite-hercynite composite brick for a zinc volatilization rotary kiln, which comprises the following raw materials in percentage by weight: 25 to 45 percent of andalusite with the granularity of 5 to 3mm, 15 to 35 percent of andalusite with the granularity of 3 to 1mm, 10 to 20 percent of andalusite with the granularity of 1 to 0mm, 10 to 20 percent of andalusite with the granularity of less than 0.088mm, 3 to 15 percent of fused hercynite with the granularity of 5 to 0mm, 3 to 15 percent of fused hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 1 to 4 percent of micro powder and 1 to 2 percent of kaolin fine powder with the granularity less than 0.044 mm; in addition, a bonding agent aluminum dihydrogen phosphate solution accounting for 2-5 percent of the total weight of the raw materials is added.
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the andalusite mainly comprises 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).
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, the electric melting hercynite comprises the main component and the weight percentage of 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 micro powder 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 kaolin mainly comprises SiO in percentage by weight 2 ≥40％、Al 2 O 3 ≥38％。
According to the andalusite-hercynite composite brick for the zinc volatilization rotary kiln and the preparation method of the aluminum dihydrogen phosphate solutionThe specific gravity 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:
a. blending the raw materials according to the raw material proportion of the andalusite-hercynite composite brick;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and carrying out mixed milling for 3-8 min; then adding the prepared fine powder and continuously 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 fused hercynite with the granularity of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with the particle size of less than 0.044 mm;
c. c, molding the mixed material obtained in the step b under the pressure of 250-300 Mpa, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 105-140 ℃ for 24-72 h; drying and then feeding the mixture 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 andalusite-hercynite composite brick is obtained after sintering.
The invention has the following positive beneficial effects:
1. in the technical scheme of the invention, the adopted andalusite raw material has the performances of high strength, high temperature resistance, strong thermal shock stability, strong chemical stability and chemical erosion resistance and the like. Therefore, the andalusite raw material is used as the aggregate in the product formula, so that the service life of the product under the harsh working condition of the zinc volatilization kiln can be ensured, the phenomena of easy hydration of magnesium, aluminum and chromium and brick explosion during the kiln drying of the chromium corundum brick in the prior art are particularly avoided, and the quality and safety accidents are avoided.
2. In the technical scheme of the invention, the adopted electric melting hercynite has the properties of large volume density, small apparent porosity, large intercrystalline interlacing force and the like, and the introduction of the electric melting hercynite into the raw material proportion can greatly improve the high-temperature performance and the volume stability of the product and simultaneously improve the thermal shock stability and the erosion resistance and permeability of the product.
3. In the technical scheme of the invention, the andalusite and the electric smelting hercynite are selected as main raw materials and are prepared by high-temperature sintering, and impurity components such as TiO 2 、K 2 O、NaO 2 And the content of CaO and the like is extremely low, and the excellent high-temperature performance is ensured due to the lower impurity content. The adoption of the chromium-free raw material synthesis can prevent hazardous waste from being generated in the later period and prevent environmental pollution. Therefore, the social environmental protection effect is obvious.
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 stability and chemical erosion resistance and the like, and is listed as follows, and the detailed description is shown in table 1.
TABLE 1 relevant Performance test data for the product andalusite-hercynite composite brick prepared by the present invention
| Bulk Density (g/cm) 3 ) | 2.90 |
| Apparent porosity (%) | 16.8 |
| Percent change in line after reheating/6 hours at 1450 ℃ (%) | -0.08 |
| Compressive strength/MPa | 96 |
| Normal temperature rupture strength/MPa | 13.5 |
| Refractoriness under load (T) 0.6 ℃) | ≥1700 |
| Thermal shock stability/1100 deg.C water cooling (second time) | ≥30 |
| Zinc slag corrosion resistance in reducing atmosphere | Is excellent in |
In summary, the following steps: the method adopts andalusite with strong chemical stability as a main raw material, introduces fused hercynite and adds alpha-Al 2 O 3 Micropowder and fine kaolin powder. By optimizing the components, the chemical erosion resistance and permeability, the thermal shock stability and the strength of the product are improved. The andalusite-hercynite composite brick prepared by the invention 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 magnesium, aluminum and chromium and brick explosion during a kiln drying period of a chromium corundum brick, and avoids the occurrence of quality and safety accidents; meanwhile, the brick can replace a magnesium-aluminum-chromium brick and a chromium-corundum brick which are polluted and have higher price, can prevent hazardous waste generated in the later period and environmental pollution, has remarkable social and environmental protection effects and has profound significance.
4. The specific implementation mode is as follows:
the present invention is further described in detail with reference to the following specific examples, which are not intended to limit the scope of the present invention.
In the embodiment of the invention, the adopted andalusite comprises the main component and the weight percentage 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 andalusite adopts high-grade raw materials with low titanium and low potassium and sodium), and the main component and the weight percentage content of the electric melting hercynite are Fe 2 O 3 ≥40％、Al 2 O 3 ≥40％，α-Al 2 O 3 Al in micro powder 2 O 3 The weight percentage content is more than or equal to 99 percent, and the main component and the weight percentage content of the kaolin are SiO 2 ≥40％、Al 2 O 3 Not less than 38 percent. The specific gravity of the aluminum dihydrogen phosphate solution is 1.32 to 1.55g/cm 3 。
Example 1:
the andalusite-hercynite composite brick for the zinc volatilization rotary kiln comprises the following raw materials in percentage by weight: andalusite with the particle size of 5-3 mm 35 percent, andalusite with the particle size of 3-1 mm 20 percent, andalusite with the particle size of 1-0 mm 14 percent, andalusite with the particle size of less than 0.088mm 20 percent, fused hercynite with the particle size of 5-0 mm 5 percent, fused hercynite with the particle size of less than 0.088mm 3 percent and alpha-Al with the particle size of less than 0.044mm 2 O 3 2% of micro powder and 1% of kaolin fine powder with the particle size of less than 0.044 mm; in addition, a binder aluminum dihydrogen phosphate solution accounting for 3 percent of the total weight of the raw materials is added (the specific gravity of the aluminum dihydrogen phosphate solution is 1.45 g/cm) 3 )。
Example 2:
the andalusite-hercynite composite brick for the zinc volatilization rotary kiln comprises the following raw materials in percentage by weight: 30% of andalusite with the granularity of 5-3 mm, 20% of andalusite with the granularity of 3-1 mm, 13% of andalusite with the granularity of 1-0 mm, 20% of andalusite with the granularity of less than 0.088mm, 4% of electrically fused hercynite with the granularity of 5-0 mm, 7% of electrically fused hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 4% of micro powder and 2% of kaolin fine powder with the particle size of less 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 inventionThe andalusite-hercynite composite brick for the zinc volatilization rotary kiln comprises the following raw materials in percentage by weight: 28 percent of andalusite with the granularity of 5-3 mm, 17 percent of andalusite with the granularity of 3-1 mm, 20 percent of andalusite with the granularity of 1-0 mm, 15 percent of andalusite with the granularity of less than 0.088mm, 5 percent of fused hercynite with the granularity of 5-0 mm, 10 percent of fused hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 3 percent of micro powder and 2 percent of kaolin fine powder with the granularity less than 0.044 mm; in addition, a bonding agent aluminum dihydrogen phosphate solution accounting for 4 percent of the total weight of the raw materials is added (the specific gravity of the aluminum dihydrogen phosphate solution is 1.32 g/cm) 3 )。
Example 4:
the andalusite-hercynite composite brick for the zinc volatilization rotary kiln comprises the following raw materials in percentage by weight: 30 percent of andalusite with the granularity of 5-3 mm, 17 percent of andalusite with the granularity of 3-1 mm, 20 percent of andalusite with the granularity of 1-0 mm, 18 percent of andalusite with the granularity of less than 0.088mm, 10 percent of fused hercynite with the granularity of 5-0 mm, 3 percent of fused 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 micro powder and 1% of kaolin fine powder with the particle size of less 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) which accounts 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 in the embodiment 1 of the invention comprises the following detailed steps:
a. blending the raw materials according to the raw material proportioning proportion of the andalusite-hercynite composite brick in the embodiment 1;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and carrying out mixed milling for 5min; adding the prepared fine powder, and continuously mixing and grinding for 15min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm and the granularity of 3Andalusite with the grain size of 1-0 mm, andalusite with the grain size of 1-0 mm and fused hercynite with the grain size of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with the particle size of less than 0.044 mm;
c. c, molding the mixed material obtained in the step b under the pressure of 250Mpa of a hydraulic brick molding press, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 120 ℃ for 24 hours; drying and then feeding the brick into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1450 ℃, and the heat is preserved for 8 hours at the sintering temperature to obtain the andalusite-hercynite composite brick.
The relevant performance detection data of the andalusite-hercynite composite brick prepared by the embodiment are detailed in table 2.
Table 2 data of performance measurements relating to the andalusite-hercynite composite bricks prepared in example 5
| Bulk Density (g/cm) 3 ) | 2.75 |
| Apparent porosity (%) | 18.3 |
| Percent change in dead line/6 hours holding at 1450% | -0.1 |
| Compressive strength/MPa | 76 |
| At normal temperatureFlexural strength/MPa | 9.8 |
| Refractoriness under load (T) 0.6 ℃) | 1610 |
| Thermal shock stability/1100 ℃ Water Cooling (second) | ≥30 |
| Zinc slag corrosion resistance in reducing atmosphere | Is excellent in |
Example 6:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln in the embodiment 2 of the invention comprises the following detailed steps:
a. blending the raw materials according to the raw material proportioning ratio of the andalusite-hercynite composite brick in the embodiment 2;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and carrying out mixed milling for 8min; adding the prepared fine powder, and continuously mixing and 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 fused hercynite with the granularity of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with particle size less than 0.044 mm;
c. c, molding the mixed material obtained in the step b by adopting a hydraulic brick molding press under the pressure of 300Mpa, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 120 ℃ for 36 hours; drying and then feeding the mixture into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1500 ℃, and the heat preservation is carried out for 10 hours at the sintering temperature, so as to obtain the andalusite-hercynite composite brick.
The relevant performance detection data of the product andalusite-hercynite composite brick prepared in this example are detailed in table 3.
Table 3 data of performance measurements relating to the andalusite-hercynite composite bricks prepared in example 6
| Bulk Density (g/cm) 3 ) | 2.78 |
| Apparent porosity (%) | 17.9 |
| Percent change in line after reheating/6 hours at 1450 ℃ (%) | -0.1 |
| Compressive strength/MPa | 81 |
| Normal temperature rupture strength/MPa | 10.3 |
| Refractoriness under load (T) 0.6 ℃) | 1632 |
| Thermal shock stability/1100 deg.C water cooling (second time) | ≥30 |
| Zinc slag corrosion resistance in reducing atmosphere | Is excellent in |
Example 7:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, disclosed by the embodiment 3 of the invention, comprises the following detailed steps:
a. blending the raw materials according to the raw material proportioning ratio of the andalusite-hercynite composite brick in the embodiment 3;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and mixing and milling for 6min; adding the prepared fine powder, and continuously mixing and grinding for 18min 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 fused hercynite with the granularity of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with the particle size of less than 0.044 mm;
c. c, molding the mixed material obtained in the step b by adopting a hydraulic brick molding press under the pressure of 290Mpa, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 120 ℃ for 72 hours; drying and then feeding the mixture into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1600 ℃, and the heat preservation is carried out for 12 hours at the sintering temperature, so as to obtain the andalusite-hercynite composite brick.
The relevant performance detection data of the andalusite-hercynite composite brick prepared by the embodiment are detailed in table 4.
Table 4 data of performance measurements on the product andalusite-hercynite composite bricks prepared in example 7
| Bulk Density (g/cm) 3 ) | 2.85 |
| Apparent porosity (%) | 17.5 |
| Percent change in line after reheating/6 hours at 1450 ℃ (%) | -0.09 |
| Compressive strength/MPa | 85 |
| Normal temperature rupture strength/MPa | 11.6 |
| Refractoriness under load (T) 0.6 ℃) | 1650 |
| Thermal shock stability/1100 ℃ Water Cooling (second) | ≥30 |
| Anti-zinc slag corrosion performance under reducing atmosphere | Is excellent in |
Example 8:
the preparation method of the andalusite-hercynite composite brick for the zinc volatilization rotary kiln, disclosed by the embodiment 4 of the invention, comprises the following detailed steps:
a. blending the raw materials according to the raw material proportioning ratio of the andalusite-hercynite composite brick in the embodiment 4;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and carrying out mixed milling for 5min; adding the prepared fine powder, and continuously mixing and 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 fused hercynite with the granularity of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with the particle size of less than 0.044 mm;
c. c, molding the mixed material obtained in the step b by adopting a hydraulic brick molding press under the pressure of 300Mpa, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 120 ℃ for 48 hours; drying and then feeding the mixture into a high-temperature tunnel kiln for sintering, wherein the sintering temperature is 1650 ℃, and the heat preservation is carried out for 10 hours at the sintering temperature, thus obtaining the andalusite-hercynite composite brick.
The relevant performance detection data of the andalusite-hercynite composite brick prepared by the embodiment are detailed in table 5.
TABLE 5 relevant Performance test data of the product andalusite-hercynite composite brick prepared in this example
| Bulk Density (g/cm) 3 ) | 2.90 |
| Apparent porosity (%) | 16.8 |
| Percent change in dead line/6 hours holding at 1450% | -0.08 |
| Compressive strength/MPa | 96 |
| Normal temperature rupture strength/MPa | 13.5 |
| Refractoriness under load (T) 0.6 ℃) | ≥1700 |
| Thermal shock stability/1100 ℃ Water Cooling (second) | ≥30 |
| Zinc slag corrosion resistance in reducing atmosphere | Is excellent in |
。
Claims (7)
1. The andalusite-hercynite composite brick for the zinc volatilization rotary kiln is characterized by comprising the following raw materials in percentage by weight: 25 to 45 percent of andalusite with the granularity of 5 to 3mm, 15 to 35 percent of andalusite with the granularity of 3 to 1mm, 10 to 20 percent of andalusite with the granularity of 1 to 0mm, 10 to 20 percent of andalusite with the granularity of less than 0.088mm, 3 to 15 percent of fused hercynite with the granularity of 5 to 0mm, 3 to 15 percent of fused hercynite with the granularity of less than 0.088mm and alpha-Al with the granularity of less than 0.044mm 2 O 3 1 to 4 percent of micro powder and 1 to 2 percent of kaolin fine powder with the granularity less than 0.044 mm; in addition, a bonding agent aluminum dihydrogen phosphate solution which accounts for 2 to 5 percent of the total weight of the raw materials is added.
2. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln as set forth in claim 1, wherein: the middle main part of andalusiteThe main components and the weight percentage of the components are Al 2 O 3 ≥58％、TiO 2 ≤0.35％、K 2 O+Na 2 O≤0.5％。
3. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln as set forth in claim 1, wherein: the electric melting hercynite comprises the main component and the weight percentage of Fe 2 O 3 ≥40％、Al 2 O 3 ≥40％。
4. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln as set forth in claim 1, wherein: the alpha-Al 2 O 3 Al in micro powder 2 O 3 The weight percentage content is more than or equal to 99 percent.
5. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln as set forth in claim 1, wherein: the kaolin comprises the main component and the weight percentage of SiO 2 ≥40％、Al 2 O 3 ≥38％。
6. The andalusite-hercynite composite brick for a zinc volatilization rotary kiln as set forth in claim 1, wherein: the specific gravity of the aluminum dihydrogen phosphate solution is 1.32-1.55 g/cm 3 。
7. A preparation method of andalusite-hercynite composite brick for a zinc volatilization rotary kiln is characterized by comprising the following steps:
a. blending the andalusite-hercynite composite brick according to the raw material proportioning ratio of the andalusite-hercynite composite brick of claim 1;
b. mixing the prepared aggregate, adding the mixture into a wet mill after mixing, adding a binding agent aluminum dihydrogen phosphate solution, and carrying out mixed milling for 3-8 min; then adding the prepared fine powder and continuously mixing and grinding for 10-20 min to obtain a mixed material;
the aggregate is andalusite with the granularity of 5-3 mm, and the granularity of 3EAndalusite with the particle size of 1mm, andalusite with the particle size of 1-0 mm and fused hercynite with the particle size of 5-0 mm; the fine powder is andalusite with a particle size of less than 0.088mm, electrically fused hercynite with a particle size of less than 0.088mm and alpha-Al with a particle size of less than 0.044mm 2 O 3 Micropowder and kaolin fine powder with the particle size of less than 0.044 mm;
c. c, molding the mixed material obtained in the step b under the pressure of 250-300 Mpa, and controlling the volume density of the green brick obtained by molding to be 2.8-3.0 g/cm 3 ；
d. Drying the obtained green bricks in a tunnel drying kiln at the temperature of 105-140 ℃ for 24-72 h; drying and then feeding the mixture 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 andalusite-hercynite composite brick is obtained after sintering.
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Denomination of invention: A composite brick of andalusite iron aluminum spinel for zinc volatilization rotary kiln and its preparation method Granted publication date: 20230822 Pledgee: Bank of Communications Ltd. Henan branch Pledgor: HENAN RUITAI FIREPROOF MATERIAL TECHNOLOGY CO.,LTD. Registration number: Y2024980022045 |
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