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A kind of fluorite-based castable for aluminum industry and preparation method thereof

An industrial and castable technology, which is applied in the field of fluorite-based castables for aluminum industry and its preparation, can solve the problems of reduced service life of refractory materials, discount of anti-sticking aluminum effect, etc., and achieves extended service life, reduced porosity, excellent Effect of anti-corrosion characteristics of molten aluminum slag

Active Publication Date: 2022-07-22
ZHENJIANG SINO FOUNDRY REFRACTORY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional refractory materials for melting aluminum introduce 1.5-5% fluorite as an anti-aluminum penetration agent, but because some fluorite is easy to dissipate due to decomposition at high temperature, the anti-sticking aluminum effect of the material is greatly reduced, which leads to the use of refractory materials. The service life is greatly reduced, but the present invention uses fluorite aggregate and fluorite fine powder as the main raw materials, and adds aluminum hydroxide, which solves the problem of partial fluorite decomposition and dissipation at high temperature, so that the refractory material still has the Very good anti-stick aluminum properties

Method used

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  • A kind of fluorite-based castable for aluminum industry and preparation method thereof
  • A kind of fluorite-based castable for aluminum industry and preparation method thereof

Examples

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Effect test

Embodiment 1

[0030] Embodiment 1: A kind of fluorite-based castable for aluminum industry and preparation method thereof

[0031] A fluorite-based castable for aluminum industry, calculated by weight percentage, comprising the following components: 71% fluorite, high-purity and low-sodium α-Al 2 O 3 Micronized powder 9%, aluminate cement 8%, SiC / Si 3 N 4 11%, water reducing agent 0.3%, explosion-proof fiber 0.1% and Al(OH) 3 0.6%.

[0032] Its preparation method comprises the following operation steps:

[0033] S1, sieve the fluorite to obtain fine fluorite with a particle size of 0.045 mm to 1 mm and a coarse fluorite with a particle size of 1 to 5 mm;

[0034] S2, the fluorite fine material, Al 2 O 3 , CaO, aluminate cement, SiC / Si 3 N 4 , water reducer and Al(OH) 3 Add to the mixer for premixing for 5min;

[0035] S3. Put the pre-mixed material in step S2, the explosion-proof fiber and the fluorite coarse material into a forced mixer for 10 minutes.

Embodiment 2

[0036] Example 2: A fluorite-based castable for aluminum industry, calculated by weight percentage, including the following components: 73% fluorite, high-purity and low-sodium α-Al 2 O 3 Micro powder 8%, aluminate cement 7%, SiC / Si 3 N 4 10%, water reducing agent 0.3%, explosion-proof fiber 0.1%, Al(OH) 3 0.8% and sodium aluminate 0.8%.

[0037] Its preparation method comprises the following operation steps:

[0038] S1, sieve the fluorite to obtain fine fluorite with a particle size of 0.045 mm to 1 mm and a coarse fluorite with a particle size of 1 to 5 mm;

[0039] S2, the fluorite fine material, Al 2 O 3 , CaO, aluminate cement, SiC / Si 3 N 4 , water reducer and Al(OH) 3 Add to the mixer for premixing for 5min;

[0040] S3. Put the pre-mixed material in step S2, the explosion-proof fiber and the fluorite coarse material into a forced mixer for 10 minutes.

Embodiment 3

[0041] Example 3: A fluorite-based castable for aluminum industry, calculated by weight percentage, including the following components: 78% fluorite, high-purity and low-sodium α-Al 2 O 3 Micro powder 7%, aluminate cement 5%, SiC / Si 3 N 4 9%, water reducing agent 0.3%, explosion-proof fiber 0.1%, Al(OH) 3 0.6%.

[0042] Its preparation method comprises the following operation steps:

[0043] S1, sieve the fluorite to obtain fine fluorite with a particle size of 0.045 mm to 1 mm and a coarse fluorite with a particle size of 1 to 5 mm;

[0044] S2, the SiC / Si 3 N 4 and Al 2 O 3 As for the uniform ball milling in the star ball mill to obtain SiC / Si 3 N 4 and Al 2 O 3 The mixture is taken out and dried with fluorite fines, CaO, aluminate cement, water reducer and Al(OH) 3 Add to the mixer for premixing for 5min;

[0045] S3. Put the pre-mixed material in step S2, the explosion-proof fiber and the fluorite coarse material into a forced mixer for 10 minutes.

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Abstract

The invention belongs to the technical field of aluminum industry smelting, and more particularly relates to a fluorite-based castable for the aluminum industry and a preparation method thereof. The technical points are as follows: Calculated by weight percentage, it includes the following components: Fluorite: 65%~75%, Al 2 O 3 : 8%~12%, CaO: 3%~6%, Aluminate cement: 5%~8%, SiC / Si 3 N 4 : 7%~10%, Al(OH) 3 : 0.5~0.8%, water reducing agent 0.1~0.3% and explosion-proof fiber 0.06~0.1%. The invention uses fluorite aggregate and fine powder as main raw materials, solves the problem of partial fluorite decomposing and dissipating at high temperature, so that the refractory material still has excellent anti-sticking aluminum properties when it contacts with molten aluminum.

Description

technical field [0001] The invention belongs to the technical field of aluminum industry smelting, and in particular relates to a fluorite-based castable for the aluminum industry and a preparation method thereof. Background technique [0002] Unshaped refractory materials used in traditional aluminum melting furnaces are easily wetted by molten aluminum and pollute the molten aluminum, and during the operation of the furnace, molten aluminum will penetrate into the cracks in the furnace lining and affect the safety of the furnace; Although the temperature of aluminum alloying is only 700 to 900 °C, the magnesium, zinc and lithium in aluminum and its aluminum alloys are very active, and they are easily reacted with elements such as silicon, potassium and sodium in the refractory material and are polluted by the refractory material. ; And the fluidity of metal aluminum melt is excellent, the viscosity of aluminum melt at 750 ° C is only 0.104Pa s, which is quite close to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/66C04B35/553C04B35/622
CPCC04B35/66C04B35/553C04B35/622C04B2235/3217C04B2235/3208C04B2235/3222C04B2235/3826C04B2235/3873C04B2235/3218C04B2235/5208C04B2235/9676C04B2235/96
Inventor 刘小团何胜平
Owner ZHENJIANG SINO FOUNDRY REFRACTORY
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