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A kind of method of vacuum microwave smelting magnesium

A vacuum microwave and magnesium smelting technology, applied in the field of magnesium smelting technology, can solve the problems of slow temperature rise of raw materials, increased energy consumption, poor heating effect, etc., and achieve the effects of full utilization of resources, energy saving and emission reduction of resources, and improvement of service life

Active Publication Date: 2018-08-31
深圳市中启新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The effect of the above-mentioned magnesium smelting method is not good when it is actually applied. The main reason is that during magnesium smelting, due to the poor microwave absorbing performance of raw materials such as dolomite, although ferrosilicon has good microwave absorbing performance, because ferrosilicon occupies the raw material The proportion of the total amount is small, so if microwaves are directly used to heat the raw materials, the temperature of the raw materials will rise slowly and the heating effect will be poor.
In addition, the calcination and reduction of the above-mentioned magnesium smelting method are discontinuous in the process of smelting raw magnesium, which will also lead to an increase in energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] A method for vacuum microwave smelting magnesium, comprising the following steps:

[0043] 1) Preparation of pellets: use dolomite as the ore raw material, ferrosilicon as the reducing agent, fluorite as the mineralizer, and semi-coke as the auxiliary heating material; respectively crush and grind the dolomite, ferrosilicon, and fluorite. The particle size is less than 100 mesh, and then dolomite, ferrosilicon, and fluorite are mixed according to the weight ratio of 100: (10-13): (2-3) to obtain the first mixture; at the same time, the semi-coke is crushed, ground, and ground After the particle size is less than 60 meshes, the semi-coke and the first mixture are mixed according to the weight ratio of 30:100 to obtain the second mixture, and the second mixture is extruded into pellets to obtain pellets;

[0044] 2) Pre-evacuation: put the pellets into a smelting furnace with a microwave heater, and the smelting furnace is connected to a jet pump vacuum system; start the ...

Embodiment 2

[0048] A method for vacuum microwave smelting magnesium, comprising the following steps:

[0049] 1) Preparation of pellets: Dolomite is used as the ore raw material, ferrosilicon is used as the reducing agent, fluorite is the mineralizer, and silicon carbide is used as the auxiliary heating material; the dolomite, ferrosilicon, and fluorite are respectively crushed and ground, and after grinding The particle size is less than 200 mesh, and then dolomite, ferrosilicon, and fluorite are mixed according to the weight ratio of 100: (10-13): (2-3) to obtain the first mixture; at the same time, the silicon carbide is crushed, ground, and ground After the particle size is less than 150 mesh, the silicon carbide and the first mixture are mixed according to the weight ratio of 20:100 to obtain the second mixture, and the second mixture is extruded into pellets to obtain pellets;

[0050] 2) Pre-evacuation: put the pellets into a smelting furnace with a microwave heater, and the smelti...

Embodiment 3

[0054] A method for vacuum microwave smelting magnesium, comprising the following steps:

[0055] 1) Preparation of pellets: use dolomite as the ore raw material, coke as the reducing agent, fluorite as the mineralizer, and coke as the auxiliary heating material; respectively crush and grind the dolomite, coke, and fluorite, and the particle size after grinding is less than 200 mesh, then mix dolomite and fluorite in a weight ratio of 100:2 to obtain the first mixture; then mix coke and the first mixture in a weight ratio of 45:100 to obtain the second mixture, and the second The mixture is extruded into pellets to obtain pellets;

[0056] 2) Pre-evacuation: put the pellets into a smelting furnace with a microwave heater, and the smelting furnace is connected to a jet pump vacuum system; start the vacuum pump for pre-evacuation;

[0057] 3) Calcination: When the pre-evacuation of the smelting furnace reaches an absolute pressure below 500Pa, turn on the microwave heater for m...

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PUM

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Abstract

The invention discloses a vacuum microwave magnesium smelting method. The method comprises the following steps that (1) ore containing magnesium carbonate, reducing agents and mineralizing agents are mixed and then are mixed with auxiliary heating materials, extrusion pelletizing is conducted, and pellets are obtained; (2) the pellets are put into a smelting furnace, and pre-vacuum-pumping is conducted; (3) after the pre-vacuum-pumping value of the smelting furnace is lower than the predetermined absolute pressure value, microwave heating calcining is conducted; and (4) after calcining is completed, the vacuum degree and microwave heating temperature are controlled, so that substances in the pellets have a reduction reaction, magnesium steam generated in the reaction process is collected through condensation, and magnesium metal is obtained. Microwave heating is adopted in the calcining and reduction processes, the needed time is obviously shortened, energy consumption is greatly reduced, and the energy efficiency is improved; at the same time, the reducing agents, the auxiliary heating materials and a crucible are not prone to having an oxidation reaction through the pre-vacuum-pumping of the smelting furnace and control over the vacuum degree during calcining, the microwave heating performance is ensured, the reduction process can be conducted smoothly, and the service life of the crucible can also be prolonged.

Description

technical field [0001] The invention relates to a magnesium smelting process, in particular to a vacuum microwave smelting magnesium method. Background technique [0002] Magnesium is a light metal with excellent comprehensive properties, light specific gravity, high specific strength, high specific stiffness, good electromagnetic shielding, strong vibration resistance, good cutting and forming performance, and easy recycling. Widely used in high-speed rail, automobiles, motorcycles, 3C products, hand tools, aerospace and defense industries and other fields. [0003] At present, the smelting of primary magnesium generally adopts the Pidgeon process. Dolomite is calcined to obtain calcined white. The calcined white is ground and pelletized together with the reducing agent ferrosilicon and the mineralizing agent fluorite, and then sent to the reduction tank for solid phase reduction reaction. Most of the Pidgeon method uses coal gas, blue charcoal gas, etc. as fuel to heat t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/22
CPCC22B26/22
Inventor 黄奕闽李杰
Owner 深圳市中启新材料有限公司