Magnesium metal smelting method and device employing plasma torch heating technology

Abstract

The invention relates to a magnesium metal smelting method and a device employing a plasma torch heating technology. The method comprises the steps that: 1, an inert gas shielded automatic charging system adds prepared raw materials for smelting magnesium metal into a plasma magnesium metal smelting furnace, 2, the raw materials perform continuous silicothermic reduction reaction in the smelting furnace to produce magnesium metal steam and reducing slag, a plasma torch provides a heat source for the reduction reaction, and 3, the magnesium metal steam from the smelting furnace enters a condenser to be condensed into crystal magnesium, the reducing slag is discharged by an inert gas shielded automatic deslagging system, the crystal magnesium can be refined continuously to form a magnesium ingot, and the reducing slag serves as a raw material of cement or is processed for recovery. The method and the device overcome the disadvantages of indirect heating and discontinuous production of a reduction pot, poor mass transfer and heat transmission during reduction, low heat efficiency and low production efficiency in the traditional magnesium smelting technology, a direct heating mode and continuous production are adopted, and the method and the device have a good energy-saving effect and a positive significance for environmental protection.

Description

technical field [0001] The present invention relates to the technical field of metal magnesium smelting, more specifically to a metal magnesium smelting method and device using advanced plasma torch heating technology, the method and device have energy-saving effects, can improve production efficiency and have positive significance for environmental protection of. Background technique [0002] my country has abundant magnesium-containing raw materials dolomite and magnesite. With the expansion of the application range of magnesium metal and magnesium alloys in the world, my country's magnesium industry has developed strongly in the past 20 years, basically controlling the global supply of primary magnesium. At the same time, the smelting of metal magnesium in my country is almost always carried out by a silicon thermal reduction process called "Pidgeon method". Although this process and equipment have the characteristics of low investment and simple process control, there ...

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Problems solved by technology

Although this process and equipment have the characteristics of low investment and simple process control, there are many problems such as low energy utilization rate and production efficiency, pollution to the environment, high labor intensity, and poor working conditions.

[0003] Over the years, my country's metal magnesium industry has adopted many technological transformation measures, such as regenerative furnaces, gas heating and waste heat utilization, etc. Although some effects have been achieved, they have not fundamentally changed the indirect heating of the reduction tank, poor mass and heat transfer, and discontinuous The disadvantages of production

At the same time, it has not changed the cumbersome process of grinding and pressing balls for raw materials. "Forged white" raw materials are easy to absorb moisture, reduce utilization, increase consumption, and cause dust pollution problems. The overall automation level has not been improved.

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