A method for preparing metallic magnesium from carbide slag and serpentine

By using carbide slag and serpentine as raw materials, and combining vacuum silicothermic reduction and step-heating process, the problems of resource dependence and environmental pollution in traditional methods of preparing metallic magnesium have been solved, and efficient, low-cost and high-purity metallic magnesium preparation has been achieved.

CN122105149APending Publication Date: 2026-05-29SHANDONG JIANZHU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG JIANZHU UNIV
Filing Date
2026-02-25
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The existing technology for preparing metallic magnesium using dolomite as raw material has problems such as high raw material cost, unsustainable resources, large carbon dioxide emissions during calcination, and energy waste caused by repeated heating and cooling of materials. In addition, the calcium carbide slag is not effectively utilized, resulting in environmental pollution.

Method used

Using carbide slag and serpentine as raw materials, a vacuum silicothermic reduction method is employed, combined with segmented temperature control and stepped heating processes. By optimizing the raw material ratio and pretreatment, the resource utilization of carbide slag is achieved, reducing raw material costs and improving reduction reaction efficiency and product purity.

Benefits of technology

This technology enables the efficient and low-cost preparation of metallic magnesium, reducing raw material costs by 20%-40%, improving reduction reaction efficiency, achieving product purity of over 99%, reducing carbon dioxide emissions, simplifying the process, and lowering equipment investment.

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Abstract

The application discloses a method for preparing metal magnesium by taking carbide slag and serpentine as raw materials, and relates to the technical field of metal smelting. The method comprises the following steps: raw material pretreatment, ingredient mixing, pressing into a group, vacuum reduction, condensation collection and the like. The carbide slag, the serpentine and ferrosilicon are ground into powder; the powder is mixed in proportion and pressed into a group; under vacuum conditions, the temperature is first raised to the decomposition temperature of the carbide slag and the serpentine for decomposition, and after complete decomposition, the temperature is continuously raised to the reduction temperature for magnesium production reaction, and after magnesium vapor condensation, metal magnesium product is obtained. The method uses industrial waste carbide slag and cheap mineral serpentine to replace traditional dolomite raw materials, completes decomposition and reduction in a single reactor, solves the problems of high raw material cost, high carbon dioxide emission and heat energy waste, realizes efficient and green preparation of metal magnesium, and the metal magnesium recovery rate reaches more than 85%, the purity is more than 99%, and the raw material cost is reduced by 20%-40%.
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