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Method of producing metal magnesium by bischofite drying calicing to make magnesium oxide to vacuum thermo reduction

A technology of magnesium oxide and metal magnesium, applied in the field of vacuum metallurgy, can solve the problems of high energy consumption, high production cost and low recovery rate of Pidgeon process

Inactive Publication Date: 2005-05-25
青海中信国安科技发展有限公司
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  • Summary
  • Abstract
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Problems solved by technology

At present, there is no breakthrough in the technical bottleneck of dehydration of electrolytic raw materials in China, and the Pidgeon method has problems such as high energy consumption and low recovery rate (the recovery rate is not higher than 66%), resulting in relatively high production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Said magnesium refining process flow of the present invention can be implemented with following:

[0011] (1) Raw material preparation: the bischofite used is cleaned of impurities, spray-dried at 150-450°C, and then calcined at 550-1200°C to obtain magnesium oxide.

[0012] (2) Ingredients: add calcium compound with 1.3-1.7 times the mass of magnesium oxide to make artificial calcined white, add ferrosilicon or silicon-aluminum ratio of 0.7-1.0 to artificial calcined white as reducing agent, and use firefly Stone is used as a catalyst, and the catalyst ratio is fluorite to artificial calcined white: 0.1-0.3,

[0013] (3) Magnesium smelting: The material is mixed and pressed into a reduction tank, and then reduced for 6-10 hours at a vacuum of 1-20Pa and a temperature of 1150-1200°C to produce magnesium metal.

[0014] The particle size of above-mentioned magnesium refining raw material calcium compound, reducing agent ferrosilicon or silicon aluminum, and catalyst flu...

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Abstract

A process for preparing metal Mg from bischofite includes removing impurities, spray drying at 150-450 deg.C, calcining at 550-1200 deg.C to obtain MgO, proportionally adding calcium compound, ferrosilicon or silicoaluminium as reducer and fluorite as catalyst, mixing, sphericizing and vacuum reducing at 1150-1200 deg.C for 6-10 hr.

Description

1. Technical field: [0001] The invention relates to a new process technology for magnesium smelting by vacuum silicothermal method, which uses magnesium oxide obtained by drying and calcining bischofite as a raw material, and belongs to the technical field of vacuum metallurgy. 2. Background technology: [0002] At present, the relatively mature production processes in the world are divided into two categories: [0003] (1) Electrolysis with anhydrous magnesium chloride as raw material, including dehydration of magnesium chloride hexahydrate, high-temperature calcination of magnesite, and granular chlorination. The former is currently only produced in a few countries such as Norway and Israel, and Minhe Magnesium Factory uses the latter for production; [0004] (2) Electrolysis with anhydrous carnallite as raw material, mainly produced in Russia, and part of the process of Minhe Magnesium Factory in my country uses metal magnesium; [0005] (3) Vacuum silicothermal method, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/04C22B26/22
Inventor 杨建元马振兴
Owner 青海中信国安科技发展有限公司
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