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Method for preparing magnesium and calcium through carbon thermal reduction

A carbothermal and reducing agent technology, applied in the field of metal smelting, can solve the problems of impure reaction products, high cost of reaction materials, low utilization rate of reaction materials, etc., to achieve the effect of improving utilization rate and reducing cost

Inactive Publication Date: 2013-07-17
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims at the problems of high cost of reaction materials, impurity of reaction products and low utilization rate of reaction raw materials existing in the existing thermal reduction technology, and provides a new method capable of saving costs and realizing separate preparation and collection of products

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] (1) Prepare the reaction material. The reaction material is composed of calcined dolomite with an MgO content of 40%, elemental carbon and calcium fluoride. The mass ratio of the ingredients is: calcined white: C:CaF2=100:54:10;

[0017] (2) Crush all the reaction materials until the particle diameter is less than 0.10mm, and mix them evenly;

[0018] (3) Press the pulverized and uniformly mixed raw materials into pellets;

[0019] (4) Put the pellets into the reduction tank, heat up and vacuumize, at T / P 0.0395 =1307, keep for 1 hour to collect magnesium vapor, after the magnesium vapor is collected, the T / P 0.0370 =1483, kept for 0.5 hour to collect calcium vapor, condensed to obtain condensed metal magnesium and calcium respectively;

Embodiment 2

[0021] (1) Prepare the reaction material. The reaction material is composed of calcined dolomite with an MgO content of 40%, coal or coke and calcium fluoride. The mass ratio of the ingredients is: calcined white: C=100:60;

[0022] (2) Crush all the reaction materials until the particle diameter is less than 0.10mm, and mix them evenly;

[0023] (3) Press the pulverized and uniformly mixed raw materials into pellets;

[0024] (4) Put the pellets into the reduction tank, heat up and vacuumize, at T / P 0.0395 =1324, keep for 1 hour to collect magnesium vapor, after the magnesium vapor is collected, the T / P 0.0370 =1488, kept for 0.5 hour to collect calcium vapor, condensed to obtain condensed metal magnesium and calcium respectively.

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PUM

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Abstract

The invention discloses a method for preparing magnesium and calcium through carbon thermal reduction, and belongs to the field of metal smelting. The method comprises the processes of calculating calcining dolomite, a reducing agent, an additive and other reaction materials, milling and uniformly mixing reactant, pressing the reactant powder into blocks and putting into a reducing tank; carrying out a thermal reduction reaction on the reactant in the tank under an absolute pressure P of 1-20Pa and at a temperature T of 1300-2000K; and respectively collecting reduced metal steam, and condensing to obtain condensed magnesium and calcium. The method disclosed by the invention is short in manufacturing process and low in residue, and is a metal preparation method which is high in resource and energy utilization rate.

Description

technical field [0001] The invention relates to a method for preparing magnesium and calcium by carbothermal reduction, which belongs to the field of metal smelting. Background technique [0002] Magnesium is one of the lightest structural metal materials, which has the advantages of high specific strength and specific stiffness, good damping and machinability, and easy recycling. It has important and extensive applications in materials, machinery, vehicles, 3C, aerospace, national defense and other fields. [0003] Calcium can be used as a deoxidizer, dehydrating agent, reducing agent, desulfurizing agent, decarburizing agent, getter, and has important applications in the fields of materials, metallurgy, chemical industry, and electronics. [0004] The general process of the existing thermal reduction preparation technology is: (1) calcining ore containing metal elements to obtain metal oxides, (2) refining metal oxides, reducing agents, and additives into powders; (3) mea...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B26/20
Inventor 谢卫东马欣潘佳魏国兵彭晓东汪浩张玺胡发平
Owner CHONGQING UNIV
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