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Magnesium-smelting producing process and apparatus by internal heating method

A production process and magnesium smelting technology, applied in the field of internal thermal magnesium smelting production process and equipment, can solve the problems of high power consumption, low purity of magnesium produced, and limited use, and achieve high thermal efficiency, short reduction time, ferrosilicon The effect of high utilization

Inactive Publication Date: 2004-08-25
于洪喜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also many vacuum electric furnace magnesium smelting processes in the world. Due to the low purity of magnesium produced and high power consumption, not many of them are used.

Method used

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  • Magnesium-smelting producing process and apparatus by internal heating method
  • Magnesium-smelting producing process and apparatus by internal heating method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] The structure of the internal heating type magnesium smelting furnace according to the present invention will be described in detail below according to the accompanying drawings.

[0011] The shell 7 of the furnace body is built with refractory insulation bricks, and the furnace body is divided into three spaces with refractory bricks. The two spaces below are respectively the combustion chamber 22 and the flue 20, and one end of the flue is connected to the space in the furnace body above the combustion chamber. One end communicates with the outside of the furnace. A round hole with the same diameter as the magnesium reduction reactor is left on the partition 21 of the combustion chamber and the upper space. On the side of the combustion chamber, a hole is opened on the shell of the furnace body to connect with the combustion system 19. . The barrel 24 of the magnesium reduction reaction kettle 9 is made of high-temperature alloy steel, and the expansion joint 11 is we...

Embodiment 2

[0013] Take 10,000 kg of dolomite, break it into small pieces of 5-10 mm, put it into a special shaft kiln and calcinate at 1000-1100 ° C to obtain 5,400 kg of high-activity wrought white (CaO·MgO), and the calcined white is ground by a ball mill. (CaO MgO) plus ferrosilicon (75% Si) plus fluorite powder (95% CaF 2 ) mixed pellets, the pellet pressure is 1.5-2t / cm 2 , into a vacuum kettle, sent into the magnesium reduction reaction kettle of the internal heating type magnesium smelting furnace described in Example 1, at 1200 ° C, keep the vacuum tightness less than 13.33Pa, obtain metallic magnesium, add fluxing agent for refining, ingot casting, commercial magnesium. Reduction slag (2Ca.SiO 2 ) can be used as a by-product. After 4 hours of calcination, 99.98% and 800 kg of metallic magnesium can be obtained.

Embodiment 3

[0015] Get 5,400 kilograms of calcined white, make magnesium material pellets according to the procedure of Example 2, and send the pellets into the reduction reaction kettle of the internal heating type magnesium smelting furnace of Example 1, and perform reduction at 1190 ° C and a vacuum degree of 4.00 Pa Reaction still obtains 800 kilograms of metal magnesium, through a cycle of 4 hours.

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Abstract

The present invention relates to a magnesium-smelting process by using internal heating method and its equipment. It is characterized by that the pellet made up by using magnesium oxide and silicon iron can be placed in an internal vacuum magnesium reduction reaction kettle enveloped in refluxing hot air, and heated to 1180-1200 deg.c by means of radiation tubes which are passed through the reduction reaction kettle, arranged in the mode of concentric circles and communicated with combustion chamber, the degree of vacuum in the kettle is below 13.33 Pa, then the above-mentioned material can be reduced, and formed into metal magnesium. Its process is simple, and its equipment is reasonable and simple, its magnesium yield can be raised by 15-209%, and its purity can be up to 99.98%.

Description

technical field [0001] The invention relates to a production process and equipment for magnesium smelting by internal heat method using magnesium-containing ore as raw material, ferrosilicon as reducing agent and fuel as heating source. Background technique [0002] At present, thermal magnesium smelting at home and abroad uses the longest history of silicon thermal "Pidgeon" process to produce metal magnesium. Pidgeon uses the research results of Antipin and Arabyshev to reduce MgO with Si-Al as the reducing agent. . In Canada (pidgeon) for the first time, the industrialized production of magnesium metal was successfully studied, so it is called "Pidgeon" method. The essence of the process is to reduce calcined dolomite (wrought white) with ferrosilicon (75% Si) at 1200 ° C and vacuum pressure of 13.33 Pa (0.1 mm Hg), heating inside and outside the heat-resistant alloy steel horizontal tank Magnesium refining. Later, Pidgeon himself pointed out: "The best silithermal red...

Claims

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Application Information

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IPC IPC(8): C22B26/22
Inventor 于洪喜肖荣晖甘坤蒋继穆柯锐珍
Owner 于洪喜