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Method for preparing nonferrous metal by micro mist thermal recovery

A technology for non-ferrous metals and micropowders, applied in the field of thermal reduction to prepare non-ferrous metals, can solve the problems that the reaction is not easy to proceed, not easy to complete, and the reactant particles are coarse, and achieve the effects of increasing the contact probability, improving the channel, and improving the specific surface area.

Inactive Publication Date: 2010-02-10
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problem that in the existing thermal reduction method for preparing non-ferrous metals, the reactant particles are coarse, the reaction is not easy to carry out, and it is not easy to carry out the problem thoroughly, and provides a new method that can significantly improve the reaction efficiency and reduction rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) prepare materials, reactant is: calcined dolomite, carbon powder and fluorite of MgO content 40%, batching mass ratio is: MgO: C: CaF 2 =100:54:16;

[0015] (2) All the reactants are made into fine powder respectively. In the powder particle size distribution, those with a diameter of 10-10000nm account for 90wt%, those with a diameter less than 10nm account for 2wt%, and those with a diameter greater than 10000nm account for 8wt%. Mix all reactant powders evenly;

[0016] (3) The reactant powder is compressed into blocks;

[0017] (4) Put the reactant block into a vacuum reduction tank, heat to 1400±50°C, and reduce for 1 hour at a vacuum degree of 20-200Pa; collect the metal vapor generated by the reduction and condense it into condensed metal magnesium.

Embodiment 2

[0019] (1) prepare materials, reactant is: calcined dolomite, carbon powder and fluorite of MgO content 40%, batching mass ratio is: MgO: C: CaF 2 =100:54:16;

[0020] (2) All the reactants are mixed and made into fine powder under the protection of argon. In the powder particle size distribution, those with a diameter of 10-10000nm account for 95wt%, those with a diameter less than 10nm account for 3wt%, and those with a diameter greater than 10000nm account for 2wt%;

[0021] (3) The reactant powder is compressed into blocks;

[0022] (4) Put the reactant block into a vacuum reduction tank, heat to 1400±50°C, and reduce for 1 hour at a vacuum degree of 20-200Pa; collect the metal vapor generated by the reduction and condense it into condensed metal magnesium.

Embodiment 3

[0024] (1) prepare materials, reactant is: Lithium oxide, aluminum, batching mass ratio is: Li 2 O:Al=100:80;

[0025] (2) Mix all the reactants and make fine powder in vacuum, and the particle size distribution of the powder is all 10-10000nm;

[0026] (3) The reactant powder is compressed into blocks;

[0027] (4) Put the reactant block into a vacuum reduction tank, heat to 1000±50°C, and reduce for 5 hours under a vacuum degree of 0.1-10Pa; collect the metal vapor generated by the reduction and condense it into condensed metal lithium.

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Abstract

A method for preparing nonferrous metal by micro mist thermal recovery belongs to the metallurgy field. The process steps are as follows: reactant is prepared according to chemometry of reduction reaction; solid reactant is processed into powder and homogenous mixing is carried out; and reduction material is made into blocks by pressing and then placed into a reducing furnace for carrying out vacuum reduction reaction, so as to obtain metal; wherein reactant material powder with the diameter of 10-10000nm accounts for 90-100wt% of the total reactant material in the grain distribution of the reactant material powder. The invention is a metal preparation method with high resource and energy utilization and can be applicable to preparation of nonferrous metal such as magnesium, calcium, strontium, lithium and the like.

Description

technical field [0001] The invention relates to a method for preparing nonferrous metals by thermal reduction, which belongs to the field of metal smelting. Background technique [0002] The preparation of metals by thermal reduction refers to the method of reducing metal oxides in a hot state with a reducing agent to obtain elemental metals (alloys). It is one of the main methods of metal smelting and is widely used in the industrial production of non-ferrous metals such as magnesium, calcium, strontium and lithium. [0003] In the existing thermal reduction technology for preparing non-ferrous metals, the general process is: prepare the reactants according to the stoichiometry of the reduction reaction; powder the solid reactants and mix them uniformly; press the reduced powder into blocks and put them in the reduction furnace for thermal reduction React to get metal. The reactants in the metal prepared by thermal reduction (the oxide of the metal to be reduced or its pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B5/02
Inventor 谢卫东魏国兵彭晓东汤燕
Owner CHONGQING UNIV
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