Method for preparing magnesium with silica-alumina alloy as electronating agent
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A silicon-aluminum alloy and reducing agent technology, applied in the metallurgical field, can solve the problems of poor economic benefits, high pressure of agglomeration, and low recovery rate of metal magnesium, and achieve the effects of reducing equipment investment, increasing profits and reducing costs
Inactive Publication Date: 2005-02-23
郭清富
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[0004] The common problems in magnesium production by silicothermal method are: the reduction temperature is as high as 1180-1250°C, the production cycle is as long as 12 hours, and the pressure of pellet formation is high, generally 2000Kg / cm 2 , the recovery rate of metal magnesium is low, only about 65% on average, which is 15-20% lower than the world's advanced technology, high energy consumption, poor economic benefits, serious environmental pollution, and difficult to use reduction slag, etc.
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Embodiment 1
[0028] Ratio of charge: calcined dolomite 2100 kg, caustic magnesite 500 kg,
[0043] Implementation results: the output of magnesium is 710.6 kg, and the recovery rate of metal magnesium is 88.36%.
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Abstract
A method for preparing magnesium with silica-alumina alloy as reducing agent includes: using dolomite and magnesite as raw materials, silica-alumina alloy as reducing agent, reducing calcined dolomite, and producing magnesium. Its technological process is: raw material->calcined dolomite and caustic magnesite->furnish->briquetting->grinding powder->vacuum reducing->magnesium, casting and magnesium ingot. Its furnish is: calcined dolomite (24%Mg), caustic magnesite (50%Mg). Its silica-alumina alloy component and preparation are: calcined dolomite: caustic magnesite: silica-alumina= 3.8-4.0: 0.8-1.2:1-1.4. It achieves low cost and high profit.
Description
technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for preparing metal magnesium by using silicon-aluminum alloy as a reducing agent. Background technique [0002] Magnesium smelting by silicothermal method has become the main method for producing metal magnesium at present. This method uses dolomite as raw material and ferrosilicon alloy as reducing agent. Under high temperature and vacuum conditions, the calcined dolomite is reduced to generate metal magnesium. The reduction reaction is as follows: [0003] <chemistry num="003"> <chem file="200410020666_cml001.xml" / > < / chemistry> [0004] The common problems in magnesium production by silicothermal method are: the reduction temperature is as high as 1180-1250°C, the production cycle is as long as 12 hours, and the pressure of pellet formation is high, generally 2000Kg / cm 2 , the recovery rate of metal magnesium is low, only about 6...
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