Method of preparing aluminum-silicon alloy and cryolite from sodium fluorosilicate

A technology of sodium fluorosilicate and silicon alloy, which is applied in the field of preparing aluminum-silicon alloy and cryolite, can solve the problems of long process flow, high energy consumption and complexity of aluminum-silicon alloy, and achieves low environmental load and high environmental benefit. , the effect of efficient use

Active Publication Date: 2012-06-13
YUNNAN CHEM RES INST
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  • Abstract
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Problems solved by technology

The production of pure aluminum requires high-grade bauxite. The static guarantee period of bauxite in my country is only more than ten years, and the production process of aluminum-silicon alloy by this method is long and complicated, and the energy consumption is high.

Method used

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  • Method of preparing aluminum-silicon alloy and cryolite from sodium fluorosilicate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] First put 102kg of industrial aluminum powder in a graphite crucible, then put the graphite crucible into a closed reaction kettle to heat to melt the industrial aluminum powder, and keep the temperature between 800°C and 900°C. Then, 47kg of industrial sodium fluorosilicate and 21kg of previously dried and mixed sodium fluoride powder were slowly blown into a graphite crucible under the protection of dry argon to react with molten aluminum. The temperature was kept at 700°C for 30 minutes to obtain 70kg of cryolite. Solid and 100kg molten aluminum-silicon alloy with a silicon content of 7%. Finally, the cryolite solid and the molten aluminum-silicon alloy are separated by means of overflow.

Embodiment 2

[0030] First put 103.6kg of industrial aluminum powder in a graphite crucible, then put the graphite crucible into a closed reaction kettle to heat to melt the industrial aluminum powder, and keep the temperature between 800°C and 900°C. Then 84.1kg of industrial sodium fluorosilicate and 37.6kg of previously dried and mixed sodium fluoride powder were slowly blown into a graphite crucible under the protection of dry argon to react with molten aluminum. The temperature was kept at 800°C for 20 minutes to obtain 125kg Cryolite solid and 100kg molten aluminum-silicon alloy with a silicon content of 12.5%. Finally, the cryolite solid and the molten aluminum-silicon alloy are separated by means of overflow.

Embodiment 3

[0032] First put 104.3kg of industrial aluminum powder in a graphite crucible, then put the graphite crucible into a closed reaction kettle to heat to melt the industrial aluminum powder, and keep the temperature between 800°C and 900°C. Then 100.8kg of industrial sodium fluorosilicate and 45kg of previously dried and mixed sodium fluoride powder were slowly blown into a graphite crucible under the protection of dry argon to react with molten aluminum. The temperature was kept at 900°C for 15 minutes to obtain 150kg of ice crystals. Stone solid and 100kg molten aluminum-silicon alloy, wherein the silicon content is 15%. Finally, the cryolite solid and the molten aluminum-silicon alloy are separated by means of overflow.

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Abstract

The invention relates to the technical field of materials and especially to a method of preparing aluminum-silicon alloy and cryolite through reaction between sodium fluorosilicate and aluminum. The method comprises the following steps: a, fusing 100 to 110 kg of industrial aluminum powder in a graphite crucible and maintaining the graphite crucible at a temperature of 800 to 900 DEG C; b, blowing 40 to 200 kg of industrial sodium fluorosilicate and sodium fluoride powder into the graphite crucible under the protection of a dry argon atmosphere at a speed of 3-5 kg / min for reaction with molten aluminum so as to obtain cryolite solid and molten aluminum-silicon alloy; c, separating the obtained cryolite solid from the molten aluminum-silicon alloy. The method provided in the invention enables the problems of three wastes, high energy consumption and the like appearing in traditional processes to be avoided and has small environmental load and high environmental benefits.

Description

technical field [0001] The invention relates to the technical field of materials, in particular to a method for preparing aluminum-silicon alloy and cryolite by reacting sodium fluorosilicate and aluminum. Background technique [0002] Aluminum-silicon alloy is a strong composite deoxidizer, which can improve the utilization rate of deoxidizer when replacing pure aluminum in the steelmaking process, and can purify molten steel and improve steel quality. Steel ingots deoxidized with aluminum are generally called stabilized steels. Since aluminum will be oxidized to alumina after deoxidation, alumina can refine austenite grains, so steel deoxidized by aluminum has better comprehensive mechanical properties. Aluminum-silicon alloy has low density, low coefficient of thermal expansion, good casting performance and anti-wear performance. The alloy castings cast with it have high impact resistance and good high-pressure compactness, which can greatly increase the service life. Al...

Claims

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Application Information

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IPC IPC(8): C22C1/02C22C21/02C22B5/04C01F7/54
Inventor 梁雪松肖勇吴立群
Owner YUNNAN CHEM RES INST
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