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Method for reducing calcined magnesite by using calcium carbide under normal pressure

A technology for calcining magnesite and calcium carbide, which is applied in the field of calcium carbide reducing calcined magnesite at atmospheric pressure, which can solve the problems of long production cycle, discontinuous, low magnesium output, etc., and achieve cost saving, low price and easy availability Effect

Active Publication Date: 2011-03-16
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems of discontinuity, long production cycle and low magnesium output in the current silicothermal magnesium smelting process, the present invention seeks a new magnesium smelting method and process in order to achieve continuous production process, shorten reduction period, and increase magnesium yield as well as targets such as yield, raw material saving and slag reduction

Method used

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  • Method for reducing calcined magnesite by using calcium carbide under normal pressure

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Embodiment 1

[0022] figure 1 It is a process flow chart of a method for reducing calcined magnesite with calcium carbide atmospheric pressure of the present invention, as figure 1 Shown: Calcined magnesite (magnesite content above 99%) is prepared with calcium carbide and silicon dioxide in molar equivalents of 1:1:0.75, and calcium fluoride, a catalyst accounting for 8% of the total material amount, is added and then mixed uniform. Under the pressure of 30MPa, it is pressed into a material ball with a diameter of 3cm. Before putting in the material ball, the air in the reaction system is exhausted, and then a certain amount of inert gas is introduced to keep the system at normal pressure. The induced draft fan condenses the generated magnesium vapor into crystalline magnesium on the condenser at 200-550°C. After 6 hours of reaction, continuous slagging and feeding are carried out, and the crystalline magnesium is taken out.

Embodiment 2

[0024] Calcined magnesite (magnesia content over 99%) is prepared with calcium carbide and silicon dioxide in a molar equivalent ratio of 1:1.2:0.8, and calcium fluoride, a catalyst accounting for 9% of the total material amount, is added and mixed evenly. Under the pressure of 35MPa, it is pressed into a material ball with a diameter of 3cm. Before putting in the material ball, the air in the reaction system is exhausted, and then a certain amount of inert gas is introduced to keep the system at normal pressure. The temperature is raised to the reaction temperature of 1200 ° C. The induced draft fan condenses the generated magnesium vapor into crystalline magnesium on the condenser at 200-550°C. After 7 hours of reaction, continuous slagging and feeding are carried out, and the crystalline magnesium is taken out.

Embodiment 3

[0026] Calcined magnesite (magnesia content above 99%) is prepared with calcium carbide and silicon dioxide in a molar equivalent ratio of 1:1.5:1, and calcium fluoride, a catalyst accounting for 10% of the total material amount, is added and mixed evenly. Under the pressure of 45MPa, it is pressed into a material ball with a diameter of 3cm. Before putting in the material ball, the air in the reaction system is exhausted, and then a certain amount of inert gas is introduced to keep the system at normal pressure. The temperature is raised to a reaction temperature of 1250 ° C. The induced draft fan condenses the generated magnesium vapor into crystalline magnesium on the condenser at 200-550°C. After 8 hours of reaction, continuous slagging and feeding are carried out, and the crystalline magnesium is taken out.

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Abstract

The invention relates to a method for reducing calcined magnesite by using calcium carbide under normal pressure, which belongs to the field of nonferrous metal metallurgy. The method is characterized in that: the calcium carbide serving as a reducing agent, silicon dioxide serving as an additive, and the calcined magnesite (MgO) serving as a raw material are reacted in the presence of a small amount of calcium fluoride serving as a catalyst so as to produce magnesium vapor. The average grain size of reactants is about 100 meshes; and the actual ratio of the calcium carbide to the silicon dioxide to the magnesium oxide is (1-1.5):(0.75-1):1, and the calcium fluoride is 7 to 10 percent based on the total weight of the reactants. Material pellets with the diameter of about 3cm are prepared under the briquetting pressure of 30 to 50MPa and fed into a reactor; a reaction system does not contact air, and the inside of the reaction system is maintained in a normal pressure state; reaction is performed at the temperature of between 1,150 and 1,250 DEG C for 6 to 8 hours; and the magnesium vapor is finally introduced into a condenser so as to form crystal magnesium by condensation. A continuous reaction can be realized by the method and the process, so that production cost is greatly lowered, and the production cycle is shortened.

Description

technical field [0001] The invention relates to a method and a process for reducing calcined magnesite with calcium carbide at normal pressure, and in particular provides a method and process for preparing metal magnesium by reducing magnesium oxide with calcium carbide as a reducing agent under normal pressure. technical background [0002] Magnesium is a lively metal with light weight, ductility, and good electromagnetic shielding properties. The application of magnesium is mainly concentrated in the three major fields of alloy production, die-casting production, and steelmaking desulfurization, and it is also used in rare earth alloys, metal reduction and other fields. Due to the light weight of magnesium (specific gravity 1.74), magnesium alloys have obvious advantages in specific gravity, good mechanical properties and processing properties, unique electromagnetic shielding ability and reproducibility, and are known as "green" environmental protection materials, and mag...

Claims

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Application Information

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IPC IPC(8): C22B26/22C22B5/06
Inventor 夏德宏舒斌李一帆
Owner UNIV OF SCI & TECH BEIJING
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