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Method for preparing metallic magnesium by carbothermic reduction and device thereof

A metal magnesium and carbothermal technology, applied in the field of carbothermal reduction to prepare metal magnesium, can solve the problems of high energy consumption and high cost, and achieve the effects of eliminating environmental pollution, easy preparation, and reducing production costs

Inactive Publication Date: 2010-03-31
何锡钧 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for preparing magnesium metal by carbothermal reduction and its device, so as to solve the problems of high cost and large energy consumption in the method for preparing magnesium metal by silicon thermal reduction in the prior art

Method used

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  • Method for preparing metallic magnesium by carbothermic reduction and device thereof
  • Method for preparing metallic magnesium by carbothermic reduction and device thereof
  • Method for preparing metallic magnesium by carbothermic reduction and device thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0164] The calcined dolomite 134.62kg, quartz stone 35.05kg and coke 17.66kg are crushed by the crushing device 1 to make the particle size between 100-200 mesh, preferably 150 mesh, and the crushed materials are mixed in the mixing device 2. Then, the mixture is compressed in the pressing device 3 to become a block, and the compressed mixture is transported to the reduction device 4 (Φ339, 3.25 meters long, 200-210kg) The reduction reaction is carried out, wherein the reduction reaction temperature is 1200° C., the vacuum degree is 10 Pa, and the reduction time is 12 hours. The crude magnesium produced by the reduction reaction is refined and cast to form a magnesium ingot, and the purity of the product is 99.90%. In addition, the carbon monoxide gas produced by the reduction reaction is extracted by the vacuum pump unit 5 and sent to the carbon monoxide compressor 6. After that, the compressed carbon monoxide gas is fed into the coal gas storage tank 7 and heats the reduction ...

Embodiment 2

[0166] 81.93kg of calcined dolomite, 20.86kg of calcined magnesite, 26.83kg of quartz stone and 15.43kg of coke are crushed by crushing device 1, so that the particle size is between 100-200 mesh, preferably 150 mesh. Mixing is carried out in the mixing device 2, and then the mixture is compressed in the pressing device 3 to become a block, and the compressed mixture is transported to the reduction device 4 (Φ325, 2.9 meters long, The charge amount is 145.05kg) for the reduction reaction, where the reduction reaction temperature is 1200°C, the vacuum degree is 10 Pa, and the reduction time is 12 hours. The crude magnesium produced by the reduction reaction is refined and cast to form magnesium ingots. The purity of the product is 99.90%. In addition, the carbon monoxide gas produced by the reduction reaction is extracted by the vacuum pump unit 5 and sent to the carbon monoxide compressor 6. After that, the compressed carbon monoxide gas is fed into the coal gas storage tank 7 ...

Embodiment 3

[0168] The calcined dolomite 112.96kg, the calcined magnesite 28.67kg, the quartz stone 21.38kg and the coke 21.38kg are crushed by the crushing device 1, so that the particle size is between 100-200 mesh, preferably 150 mesh. Mixing is carried out in the mixing device 2, and then the mixture is compressed in the pressing device 3 to become a block, and the compressed mixture is transported to the reduction device 4 (Φ339, 3.25 meters long, The charging amount is 200~210kg) to carry out the reduction reaction. The temperature of the reduction reaction is 1225℃, the vacuum degree is 10Pa, and the reduction time is 14 hours. The crude magnesium produced by the reduction reaction is refined and cast to form magnesium ingots. The purity of the product Is 99.90%. In addition, the carbon monoxide gas produced by the reduction reaction is extracted by the vacuum pump unit 5 and sent to the carbon monoxide compressor 6. After that, the compressed carbon monoxide gas is fed into the coa...

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Abstract

The invention discloses a method for preparing metallic magnesium by carbothermic reduction and a device thereof. The method comprises the following steps: crushing raw materials of calcined dolomite,quartzite and carbonaceous reducing agent and then mixing; pressing the above raw materials into bulk bodies; under a vacuum state, carrying out reduction reaction on the mixed material pressed intobulk bodies according to the chemical equation: 4CaO + 5MgO + 2SiO2 + 5C = 2(2CaO-SiO2)+ 5Mg + 5CO to prepare metallic magnesium, wherein, the raw materials are mixed according to the molar ratio of the reduction reaction, the carbonaceous reducing agent can be graphite, charcoal or coke, and the raw materials also can comprises calcined magnesite or magnesium oxide, at the moment, the calcined dolomite can be replaced by quick lime or calcined limestone. In the method, the CaSi2 production technology principle is introduced, carbonaceous reducing agent is utilized to replace FeSi, thereby greatly reducing production cost, reducing energy consumption, decreasing environmental pollution, and speeding up the preparation speed of metallic magnesium.

Description

Technical field [0001] The invention relates to a method and a device for preparing metallic magnesium, in particular to a method and a device for preparing metallic magnesium by carbothermal reduction. Background technique [0002] The production of magnesium metal in my country mainly adopts vacuum silicothermal reduction smelting process, which uses dolomite as raw material and ferrosilicon as reducing agent. For example, a Chinese patent (publication number: CN951004956) discloses an electric furnace hot charging silicothermal reduction vacuum smelting magnesium The new process uses dolomite as raw material and ferrosilicon as reducing agent to prepare metallic magnesium through silicothermal reduction reaction. However, the price of ferrosilicon (FeSi) as a reducing agent is increasing day by day, which makes the cost of preparing metallic magnesium also increase, which severely limits the use of metallic magnesium. In addition, the production of ferrosilicon raw materials a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22C22B5/10
Inventor 何锡钧张青松
Owner 何锡钧
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