Technology for simultaneously preparing metallic magnesium and calcium carbide through carbothermal method

A technology of metal magnesium and carbothermal method, applied in the direction of carbide, calcium carbide, etc., can solve problems such as waste of the environment and pollution, achieve the effects of reducing raw material costs, solving environmental pollution problems, and improving the utilization rate of raw materials and equipment

Active Publication Date: 2017-08-22
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation of metallic magnesium mostly adopts the Pidgeon method, which uses a silicon reducing agent to reduce the MgO in the calcined white to metallic magnesium, and the CaO in the calcined white enters the slag phase and is wasted and causes environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In this embodiment, calcined white powder is used to configure mixed raw materials, including 25 parts of magnesium oxide powder, 37 parts of calcium oxide powder, hydration activity of calcined white powder is 28%, 35 parts of graphite, and 3 parts of CaF 2 For fluorite powder with a content of 98%, the above ingredients are sent to a ball mill with a sieve for mixing, grinding and sieving. The fineness distribution of the mixed material after grinding and sieving is: -100 mesh to -150 mesh is 80%, -150 mesh to -150 mesh -250 mesh is 20%. The screened two fineness powders are evenly mixed, and sent to the high-pressure roller press ball machine by the conveyor for compression molding. The pellet forming pressure is 150kg / cm 2 Left and right, the shape of the pellets is walnut or ellipsoid, with a diameter of about 20mm and a thickness of about 14mm, and then the pellets are dried at a temperature of 500°C for 1 hour.

[0030] The prepared pellets have an average densi...

Embodiment 2

[0039] The reaction material in this embodiment is a mixed raw material of calcined white, calcium oxide, graphite and calcium fluoride, and the mass ratio is 100:58:90:5, wherein the hydration activity of calcined white powder is 34%, and that of calcium oxide powder is The hydration activity is 31%, and the above-mentioned powder is sent to a ball mill with a sieve for mixing, grinding and sieving. The fineness distribution of the mixed material after grinding and sieving is: -100 mesh to -150 mesh is 70%, -150 mesh ~-250 mesh is 30%. The screened two fineness powders are evenly mixed, and sent to the high-pressure roller ball press by the conveyor for compression molding. The pellet molding pressure is 145kg / cm 2 Left and right, the shape of the pellets is walnut-shaped and ellipsoidal, with a diameter of about 18mm and a thickness of about 15mm, and then the pellets are dried at a temperature of 550°C for 1.1 hours.

[0040] The prepared pellets have an average density of...

Embodiment 3

[0043]The reaction material in this embodiment is a mixed raw material of calcined white, quicklime, magnesium oxide, coke and calcium fluoride, with a total weight of 15g and a mass ratio of 60:35:16:86:8, wherein the hydration activity of calcined white powder is 34%, the hydration activity of the contained calcium oxide powder is 28%, the above powder is sent to a ball mill with a sieve for mixing, grinding and sieving, and the fineness distribution of the mixed material after grinding and sieving is: -100 mesh~ -150 mesh was 64%, and -150 mesh to -250 mesh was 36%. After the screened powders of two finenesses are evenly mixed, they are sent by the conveyor to a high-pressure roller ball press for compaction, and the pellet forming pressure is 158kg / cm 2 Left and right, the shape of the pellets is walnut and ellipsoid, with a diameter of about 17mm and a thickness of about 15mm, and then the pellets are dried at a temperature of 520°C for 1.2 hours.

[0044] The prepared p...

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Abstract

The invention discloses a technology for simultaneously preparing metallic magnesium and calcium carbide through a carbothermal method and belongs to the field of metallic magnesium smelting. The technology comprises the preparation steps that firstly, a magnesium oxide, a calcium oxide, a carbonaceous reducing agent and a fluorite catalyst are prepared according to the weight ratio of components; secondly, the prepared materials are mixed uniformly and then placed into a ball grinding mill with a screen to be ground and screened, and materials with different finenesses are obtained; thirdly, the screened materials are mixed uniformly and then sent into a high-pressure double-roller ball press machine to be pressed into balls and dried; and fourthly, the balls are placed into a vacuum reactor, the vacuum reactor is vacuumized, and metallic magnesium steam and the calcium carbide are produced under a certain pressure and a certain pressure. By utilizing the magnesium oxide and the calcium oxide, the magnesium and the calcium carbide can be produced simultaneously, energy sources are saved, environmental pollution is reduced, and the raw material utilization rate is increased greatly.

Description

technical field [0001] The invention relates to the technical field of metal magnesium smelting, and more specifically relates to a process for simultaneously preparing metal magnesium and calcium carbide by a carbothermal method. Background technique [0002] In the traditional thermal magnesium smelting process, the primary magnesium produced by the Pidgeon method accounts for more than 95% of the total output, and it is the most widely used metal magnesium smelting process. It is produced by reducing calcined dolomite with ferrosilicon under high temperature and high vacuum conditions. Magnesium Vapor. However, the existing Pidgeon method magnesium smelting enterprises have problems such as serious environmental pollution, high production cost, high labor intensity, high energy consumption, and low production efficiency. Therefore, it is necessary to research and improve the traditional silicon thermal magnesium smelting technology to solve these problems. The carbother...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22C22B1/24C22B5/10C01B32/942
CPCC22B1/2406C22B5/10C22B26/22
Inventor 楚化强张超顾明言
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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