Method for smelting magnesium metal with rare earth waste serving as mineralizing agent

Abstract

The invention relates to a method for smelting magnesium metal, in particular to a method for smelting magnesium metal with the rare earth waste serving as a mineralizing agent. According to the method, the fluorine-containing mineralizing agent fluorite is partially or completely replaced, the influence of the fluorine-containing matter to the environment is removed, and the powdering problem ofthe magnesium slag can be solved. The method comprises the following steps of: feeding parched cerium oxide polishing liquid recovery material to replace the fluorite to be served as a new mineralizing agent to uniformly mix with the silicon iron and the calcined dolomite during the mixing and fine grinding process of the production raw materials of the magnesium metal; pressing the mixture into ball through an oil press under pressure of 15 tons; and then reducing in a reducing tank at a high temperature under a vacuum condition; heating the reducing tank to reach to the temperature about 1200 DEG C, and keeping the temperature; and condensing the magnesium steam at the cooling end of the reducing tank to obtain the crude magnesium under the sucking force of a vacuum system. The method is simple in technology and low in cost, and adopts the rare earth waste to replace the fluorite to smelt the new mineralizing agent.

Description

technical field [0001] The present invention relates to a metal magnesium smelting method, in particular to a method that partially or completely replaces fluorine-containing mineralizer fluorite, eliminates the impact of fluorine-containing substances on the environment, and simultaneously solves the problem of powdering magnesium slag. A method for smelting metal magnesium with rare earth waste as a mineralizer. Background technique [0002] The process adopted by the vast majority of magnesium smelting enterprises in my country is the Pidgeon method. The Pidgeon method uses ferrosilicon to reduce magnesium oxide in dolomite, and fluorite is used as a mineralizer to promote the reduction reaction. Usually 1 ton of magnesium produced by Pidgeon method will produce 6-8 tons of reducing slag. Magnesium slag poses two major threats to the environment: 1) fine particles cause dust to fly, and the dust pollutes the environment; 2) fluoride in fluorite enters the slag after sme...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a method with simple process and low cost, and use rare earth waste instead of fluorite as a mineralizer for magnesium smelting, and fundamentally solve the problem that the fluorine content in magnesium slag exceeds the standard At the same time, it improves the volume stability of magnesium slag, eliminates dust pollution, improves the hydration activity of magnesium slag, and can increase the proportion of magnesium slag to prepare building materials. A method for smelting metal magnesium using rare earth waste as a mineralizer