Method for smelting magnesium by hot method

A technology of magnesium smelting and thermal method, applied in the field of thermal magnesium smelting, can solve the problems of industrial solid waste environmental pollution, low production efficiency, no use value, etc., and achieve the effects of reducing the amount of waste residue, improving production efficiency, and shortening reduction time.

Inactive Publication Date: 2009-12-09
登封电厂集团铝合金有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using this method to smelt magnesium, the reduction temperature is high, the energy consumption is large, and the production efficiency is low
In addition, for every ton of magnesium metal produced, 5.5-6 tons of industrial waste slag are produced at the same time. The main components of the slag are: CaO.SiO, MgO, SiFe, and ferrite (nCaO.mFe2O), aluminate (nCaO.mAL2O3, CaO.AL2O3.SiO2), etc., have no use value and cause industrial solid waste environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) Dolomite is calcined in a rotary kiln at 1150°C for 45 minutes, and then ground into a particle size of less than 100 mesh by a ball mill. The composition of dolomite is: loss on ignition 46.12%, MgO: 20.56%, CaO: 32.78%, and the rest are impurities ;

[0031] The industrial aluminum-silicon alloy is first crushed into 20mm particles by a jaw crusher, and then made into a fine powder with a particle size of less than 100 mesh by a Raymond machine. The weight percentage of the aluminum-silicon alloy is Al45.34%, Si52.46%, Fe1. 5% and other impurities;

[0032] (2) Get 4.68 tons of calcined dolomite (accounting for 85.2%), 0.81 tons of aluminum-silicon alloy fine powder (14.8%), after mixing, use a high-pressure ball press to make pellets with a pressure of 20MPa and then pack into a reduction tank. Carry out reduction at a reduction temperature of 1050° C. for 7 hours to obtain metallic magnesium.

[0033] Post-production statistics: 810Kg of alloy and 4680Kg of ca...

Embodiment 2

[0036] (1) Dolomite is calcined in a rotary kiln at 1180°C for 50 minutes, and then ground into a particle size of less than 100 mesh by a ball mill; the composition of dolomite is: loss on ignition 46.45%, MgO: 23.13%, CaO: 29.65%, and the rest are impurities ;

[0037] The aluminum-silicon alloy is first crushed into 20mm particles by a jaw crusher, and then made into a fine powder with a particle size of less than 100 mesh by a Raymond mill.

[0038] Among them, the weight percentage of aluminum-silicon alloy is Al49.15%, Si47.12, Fe3.2% and other impurities;

[0039] (2) Get 4.41 tons (83.52%) of calcined dolomite, 0.87 tons (16.48%) of aluminum-silicon alloy fine powder, and the mixed material is made into pellets with a high-pressure ball press through a pressure of 20MPa and then packed into a reduction tank. Reduction was carried out at a temperature of 1100°C for 8 hours to obtain metal magnesium.

[0040] The impurity percentage content in the obtained magnesium is...

Embodiment 3

[0042] (1) Dolomite and magnesite are respectively calcined in a rotary kiln at 1200°C for 55 minutes, and then ground into a particle size of less than 100 mesh by a ball mill; the composition of dolomite is: loss on ignition 46.89%, MgO: 19.97%, CaO: 32.23 %, the rest are impurities;

[0043] The composition of magnesite is: MgO: 45.2, CaO 2.9%, SiO 2 1.5%, loss on ignition 50.1%;

[0044] The aluminum-silicon alloy is first crushed into 20mm particles by a jaw crusher, and then made into a fine powder with a particle size of less than 100 mesh by a Raymond machine. The weight percentage of the aluminum-silicon alloy is Al44.34%, Si53.12%, Fe2.1 % and other impurities;

[0045] (2) Take 0.23 tons (6.82%) of magnesite, 2.54 tons (75.37%) of dolomite after calcining, and 0.6 tons (17.8%) of aluminum-silicon alloy. Put it into a reduction tank, and carry out reduction at a reduction temperature of 1160°C for 9 hours to obtain metal magnesium.

[0046] The impurity percentag...

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Abstract

The invention provides a method for smelting magnesium by a hot method. The method comprises the following steps that: (1) after dolomite and magnesite are calcined by a rotary kiln respectively at a temperature of between 1,150 and 1,200 DEG C, the dolomite and the magnesite are ground into powder with granularity less than 100 meshes, wherein the dolomite comprises the following chemical compositions in percentage by weight: 46 to 47 percent of ignition loss, 19 to 21 percent of MgO, 30 to 33 percent of CaO, and the balance of impurities; the magnesite comprises the following chemical compositions in percentage by weight: 45.2 to 47.2 percent of MgO, 0.2 to 3 percent of CaO, 0.2 to 2.0 percent of SiO2, 50.1 to 52.0 percent of ignition loss, and the balance of impurities; aluminum-silicon alloy is ground into fine powder with granularity less than 100 meshes, wherein the aluminum-silicon alloy comprises the following compositions in percentage by weight: 44 to 50 percent of Al, 45 to 55 percent of Si, and the balance of impurities; and (2) 83 to 86 percent of the calcined dolomite and 14 to 17 percent of the aluminum-silicon alloy fine powder are weighed according to weight percentage, and the mixed materials are made into pellets under the pressure of 20MPa, are filled into a reduction jar, and are reduced for 7 to 9 hours at a reducing temperature of between 1,050 and 1,160 DEG C to produce the magnesium. The method for smelting the magnesium by the hot method has low reduction temperature, small energy consumption and high production efficiency and is environment-friendly.

Description

technical field [0001] The invention relates to a metal production method, in particular to a method for smelting magnesium by thermal method. Background technique [0002] In today's industrial production, in addition to the electrolytic method of magnesium smelting, the thermal method of magnesium smelting mainly adopts the silicon thermal method, that is, calcined dolomite is used as raw material, ferrosilicon is used as reducing agent, and high temperature and high vacuum at a temperature of about 1200 ° C - 1260 ° C (1-13Pa) to carry out the reduction reaction to produce metal magnesium, which is the silicon thermal method of magnesium smelting. In the production of this method, about 1.2 tons of ferrosilicon (Si>75%) is needed to produce per ton of metal magnesium, the utilization rate of silicon in ferrosilicon is 65-70%, and the reduction efficiency of MgO is about 76%. Using this method to smelt magnesium has high reduction temperature, high energy consumption a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B26/22C22B5/04
Inventor 刘迎忠王峰康朝阳高国卿
Owner 登封电厂集团铝合金有限公司
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