Method for preparing aluminium-silicon alloy and aluminium fluoride through reducing silicon tetrafluoride by utilizing aluminium

A silicon tetrafluoride and silicon alloy technology, applied in the field of materials, can solve problems such as complexity, high energy consumption, and long aluminum-silicon alloy process flow, and achieve the effects of small environmental load, high environmental benefits, and avoiding high energy consumption

Inactive Publication Date: 2012-04-04
YUNNAN CHEM RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 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 26kg of dry industrial silicon tetrafluoride gas is slowly introduced into the graphite crucible to react with molten aluminum, the temperature is kept at 700°C, and the reaction is carried out for 30 minutes to obtain 28kg of aluminum fluoride solid and 100kg of molten aluminum-silicon alloy, wherein the silicon content is 7%. Finally, the solid aluminum fluoride and the molten aluminum-silicon alloy are separated by means of overflow.

Embodiment 2

[0026] 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 46.4kg of dry industrial silicon tetrafluoride gas is slowly passed into the graphite crucible to react with the molten aluminum. The temperature is kept at 800°C for 20 minutes to obtain 50kg of aluminum fluoride solid and 100kg of molten aluminum-silicon alloy. 12.5%. Finally, the solid aluminum fluoride and the molten aluminum-silicon alloy are separated by means of overflow.

Embodiment 3

[0028] 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 55.7kg of dry industrial silicon tetrafluoride gas is slowly introduced into the graphite crucible to react with the molten aluminum. The temperature is kept at 900°C for 15 minutes to obtain 60kg of aluminum fluoride solid and 100kg of molten aluminum-silicon alloy. 15%. Finally, the solid aluminum fluoride and the molten aluminum-silicon alloy are separated by means of overflow.

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Abstract

The invention provides a method for preparing aluminium-silicon alloy and aluminium fluoride through reducing silicon tetrafluoride by utilizing aluminium, relates to the technical field of materials, in particular to a method for preparing aluminium-silicon alloy and aluminium fluoride through reacting silicon tetrafluoride with aluminium. The method comprises the following steps: a, melting 100-110kg of industrial aluminium powder in a graphite crucible and maintaining the temperature at 800-900 DEG C; b, introducing 20-100kg of industrial silicon tetrafluoride gas into the graphite crucible at a speed of 3-5kg/min so as to react with molten aluminium, thus obtaining soild aluminium fluoride and molten aluminium-silicon alloy; and c, separating the obtained solid aluminium fluoride from the molten aluminium-silicon alloy. By utilizing the method provided by the invention, the problems such as the three wastes, high energy consumption and the like existing in a traditional process route can be solved, the environment load is smaller, and the environmental benefits are higher.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a method for preparing aluminum-silicon alloy and aluminum fluoride by reacting silicon tetrafluoride 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 ...

Claims

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Application Information

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IPC IPC(8): C22C1/00C22C21/02C01F7/50
Inventor 梁雪松肖勇吴立群
Owner YUNNAN CHEM RES INST
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