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

A technology of rare earth waste and metal magnesium, which is applied in the field of metal magnesium smelting, can solve problems such as enlargement and excessive fluorine content in magnesium slag, and achieve the effects of simple process, reduced pollution and improved strength in the later stage

Active Publication Date: 2012-12-19
BEIFANG UNIV OF NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Experimental program
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Effect test

Embodiment 1

[0012] Embodiment 1: A method for smelting metal magnesium using rare earth waste as a mineralizer, the method is: firstly, in the process of mixing and grinding the raw materials for metal magnesium production, adding dried cerium oxide polishing liquid recovery to replace fluorite As a new mineralizer, it is mixed with ferrosilicon and calcined white, pressed into pellets by a hydraulic press with a pressure of 15 tons, and then placed in a reduction tank at a temperature of 1150-1250°C and a vacuum degree of 7-20 Pa. In the process of reducing magnesium oxide, the added new mineralizer reacts with the reactants to promote the formation of magnesium vapor. The temperature in the reduction furnace is 1200°C, and the reduction tank is kept warm for 7.5 hours in the furnace. Under the suction of the vacuum system, the magnesium vapor condenses into crude magnesium at the cooling end of the reduction tank.

[0013] The magnesium refining raw materials are raw materials from a ce...

Embodiment 2

[0015] Embodiment 2: A method for smelting metal magnesium using rare earth waste as a mineralizer, the method is: firstly, in the process of mixing and grinding raw materials for metal magnesium production, adding dried cerium oxide polishing liquid recovery to replace fluorite As a new mineralizer, it is mixed with ferrosilicon and calcined white, pressed into pellets by a hydraulic press with a pressure of 15 tons, and then placed in a reduction tank at a temperature of 1150-1250°C and a vacuum degree of 7-20 Pa. Medium reduction, in the process of reducing magnesium oxide, the added new mineralizer reacts with the reactant, which promotes the formation of magnesium vapor, and the reduction tank is kept at 1200°C for 7.5 hours. Under the suction of the vacuum system, the magnesium The vapor condenses into crude magnesium at the cool end of the reduction tank.

[0016] The magnesium smelting raw materials are raw materials from a magnesium factory in Fugu, calcined dolomite ...

Embodiment 3

[0018] Embodiment 3: A method for smelting metal magnesium using rare earth waste as a mineralizer, the method is: firstly, in the process of mixing and grinding raw materials for metal magnesium production, adding dried cerium oxide polishing liquid recovery to replace fluorite As a new mineralizer, it is mixed with ferrosilicon and calcined white, pressed into pellets by a hydraulic press with a pressure of 15 tons, and then placed in a reduction tank at a temperature of 1150-1250°C and a vacuum degree of 7-20 Pa. Medium reduction, in the process of reducing magnesium oxide, the added new mineralizer reacts with the reactant, which promotes the formation of magnesium vapor, and the reduction tank is kept at 1200°C for 7.5 hours. Under the suction of the vacuum system, the magnesium The vapor condenses into crude magnesium at the cool end of the reduction tank.

[0019] The magnesium refining raw materials are raw materials from a certain magnesium factory in Fugu, calcined d...

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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...

Claims

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Application Information

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IPC IPC(8): C22B26/22C22B5/16C22B5/04
Inventor 吴澜尔韩凤兰杨奇星陈宇红郭生伟杜春陆有军
Owner BEIFANG UNIV OF NATITIES
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