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Method for preparing magnesium

A technology of metal magnesium and magnesium vapor, applied in the field of metallurgy, can solve problems such as difficult to achieve continuous production, serious environmental pollution, and difficult to use reducing slag

Active Publication Date: 2014-11-26
SHENWU TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages are: the chlorine gas released from the anode will seriously pollute the environment, and the equipment investment is large and the energy consumption is high
[0007] The problems in the traditional method of preparing magnesium metal are that the production cycle can reach up to 12 hours, the pressure of the pressure ball is high, the consumption cost of the reduction tank is high, and the recovery rate of metal magnesium is low, which is only about 65% on average, which is 15% lower than that of the world's advanced technology. ~20%, high energy consumption, poor economic benefits, serious environmental pollution, difficult to use reducing slag, and difficult to achieve continuous production, etc.

Method used

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  • Method for preparing magnesium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] The dolomite is crushed to an average particle size of not more than 25mm, and calcined in a rotary kiln at a temperature of 1250°C; the “calcined white” cooled to room temperature and the reducing agent ferrosilicon are prepared according to Si(Fe):MgO=2.2 (mole Ratio) batching, and then add 2% fluorite of the total of the two mixtures, after mixing, send it into the ball mill for grinding until the average particle size is 0.2mm, when the pressure of the ball press is 10MPa, the mixture Press into elliptical pellets; control the strong reducing atmosphere in the rotary hearth furnace. In the rotary hearth furnace, the pellets are reduced through the feeding area, preheating area, heating area, high temperature area, control area, and discharge area with the rotation of the rotary hearth furnace. The reduction time is 4 hours. The metal magnesium produced during the reduction process The steam crystallizes on the condenser on the top of the furnace, and the temperature...

Embodiment 2

[0090]The dolomite is crushed to an average particle size of not more than 35mm, and calcined in a rotary kiln at a temperature of 1200°C; the "calcined white" cooled to room temperature and the reducing agent ferrosilicon are prepared according to Si(Fe):MgO=2.8 (mole Ratio) ingredients, and then add the total 3% fluorite of the two mixtures, after mixing, send them into the ball mill for grinding until the average particle size is below 1mm, and press the mixture when the pressure of the ball press is 10MPa Form elliptical pellets; control the strong reducing atmosphere in the rotary hearth furnace. In the hearth furnace, the pellets are reduced through the feeding area, preheating area, heating area, high temperature area, control area, and discharge area with the rotation of the rotary hearth furnace. The reduction time is 1h. The metal magnesium vapor generated during the reduction process Crystallize on the condenser on the top of the furnace. The temperature of the cond...

Embodiment 3

[0092] The dolomite is crushed to an average particle size of not more than 35mm, and calcined in a rotary kiln at a temperature of 1200°C; the "calcined white" cooled to room temperature and the reducing agent ferrosilicon are prepared according to Si(Fe):MgO=2.5 (mole Ratio) batching, and then add 3% fluorite of the total of the two mixtures, after mixing, send them into the ball mill for grinding to an average particle size below 0.5mm, and mix the mixture when the pressure of the ball press is 10MPa Press into elliptical pellets; control the strong reducing atmosphere in the rotary hearth furnace, the maximum reduction temperature of the rotary hearth furnace is 1220°C, and the pressure in the furnace is between 13 and 15Pa. In the rotary hearth furnace, the pellets go through the feeding area, preheating area, heating area, high temperature area, control area, and discharge area successively with the rotation of the rotary hearth furnace for reduction. The reduction time i...

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Abstract

The invention discloses a method for preparing magnesium. The method comprises the following steps: calcining dolomite in a rotary kiln to obtain calcined dolomite and tail gas; mixing the calcined dolomite with ferrosilicon and fluorite to obtain a mixture; performing ball-milling on the mixture to obtain a granular mixture; briquetting the granular mixture to obtain pelletized materials; arranging the pelletized materials into a feeding region in a rotary hearth furnace, gradually heating the pelletized materials in the feeding region in a preheating region and a heating region, and performing reduction reaction on the pelletized materials in a high-temperature region to obtain magnesium steam, flue gas and furnace slag; condensing the magnesium steam to obtain magnesium. The method disclosed by the embodiment of the invention is simple in process and low in energy consumption; the reduction reaction is carried out by adopting the rotary hearth furnace, so that magnesium can be continuously produced, the yield is increased, and efficient production of magnesium can be carried out.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular, the invention relates to a method for preparing metallic magnesium. Background technique [0002] As a new type of application material, magnesium and magnesium alloys have been widely used in many aspects of military and civilian fields in recent years; magnesium alloys, as the lightest structural materials, can meet the increasingly stringent energy-saving and exhaust emission requirements of the transportation industry. [0003] my country is one of the countries with the most abundant magnesium resources in the world. Magnesite resources are of all types and widely distributed. The total reserves account for 22.5% of the world, ranking first in the world: the reserves of magnesite rank first in the world, and the proven reserves of magnesite 3.4 billion tons, accounting for 28.3% of the world's total reserves of magnesite; my country is rich in magnesium-containing dolomite, with prove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22
Inventor 吴道洪刘占华曹志成薛逊
Owner SHENWU TECH GRP CO LTD
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