Technology for preparing magnesium metal by magnesium oxide aluminothermic reduction method

A magnesia-alumina and reduction technology, which is applied in the field of magnesium-aluminothermic reduction of magnesium metal, can solve the problems of high energy consumption, poor environmental compatibility, etc. Effect

Inactive Publication Date: 2013-10-30
昊青薪材(北京)技术有限公司
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Problems solved by technology

Its purpose is to solve the two major problems of high energy consumption and poor environmental compatibility existing in the existing magnesium smelting process, seek a new magnesium smelting process, reduce the red

Method used

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  • Technology for preparing magnesium metal by magnesium oxide aluminothermic reduction method
  • Technology for preparing magnesium metal by magnesium oxide aluminothermic reduction method
  • Technology for preparing magnesium metal by magnesium oxide aluminothermic reduction method

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Embodiment Construction

[0033] Process flow of the present invention such as figure 2 shown. A process for preparing metallic magnesium by the aluminothermic reduction method of magnesia in the present invention adopts magnesia powder as raw material, aluminum powder as reducing agent, and then carries out batching. Aluminothermic reduction is a vacuum smelting process to generate coarse magnesium and spinel (MgAl 2 o 4 ).

[0034] Specifically, the technical process of the present invention is to mix the magnesium oxide powder with a particle size of 100 to 200 mesh and the aluminum powder with a particle size of 70 to 100 mesh in a molar ratio of 2: (1.0 to 1.2); Pressed into briquettes under the condition of 40 MPa. Put the pressed agglomerate into a reduction furnace, vacuumize to 1-13.3Pa, and react for 3-6 hours at 1050-1150°C. The reaction produces crude magnesium, and the by-product spinel powder can be used as products, and there is no waste residue discharge in the whole process. Its...

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Abstract

The invention relates to a method for preparing magnesium metal by taking magnesium oxide as a raw material and aluminum powder as a reducing agent through vacuum thermal reduction. The method for preparing magnesium metal comprises the following steps of: firstly, weighing and mixing magnesium oxide powder and aluminum powder according to the mole ratio of 2: (0.8-1.2); briquetting under the pressure of 20-35 MPa; putting into a reduction furnace; reducing under the conditions of the temperature of 1050-1150 DEG C and the vacuum degree of 1-13.3MPa for 3-6 hours. Compared with the pidgeon process, the total weight of the reduced and reacted materials in the prior art is reduced by above 50%; the energy consumption is reduced by about 54%; the CO2 tail gas emission is reduced by above 60%; a byproduct spinel powder body can be sold as a product, has no generated waste slag, and the whole process corresponds to the efficient and energy-saving requirements.

Description

technical field [0001] The invention relates to a process method for preparing metal magnesium by the aluminothermic reduction method of magnesium oxide. Background technique [0002] The Pidgeon method is almost always used in magnesium smelting in my country. In this process, calcined dolomite (commonly known as calcined white) and ferrosilicon are ground into powder and compacted in a certain ratio, and put into a retort made of heat-resistant alloy. The principle of magnesium smelting is to use silicon (75% Si-Fe alloy) as a reducing agent to react to produce metallic magnesium at a temperature of 1250°C and a vacuum of 1.3-13.3Pa. Its response is: [0003] 2(CaO·MgO)(solid)+Si(Fe)(solid)→2Mg↑(gas)+2CaO·SiO 2 (Solid)+Fe(Si)(Solid) [0004] The main problems of the Pidgeon method: (1) serious environmental pollution. The emission of dust and waste slag reaches 6.5-7.0t / ton of raw magnesium; from the mining of dolomite ore to the delivery of metal magnesium ingots, the...

Claims

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Application Information

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IPC IPC(8): C22B26/22C22B5/04
Inventor 姚文贵马鸿文姜晓谦
Owner 昊青薪材(北京)技术有限公司
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