Method for smelting magnesium by decomposition in vacuum through microwaves

A microwave vacuum and metal magnesium technology, which is applied in the field of microwave preparation of crude metal magnesium and microwave vacuum decomposition and smelting of metal magnesium, can solve the problems of high cost, poor environmental protection, high energy consumption, etc., and achieve the effect of increasing yield

Inactive Publication Date: 2013-01-09
ADVANCED TECHNOLOGY & MATERIALS CO LTD +1
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Problems solved by technology

[0017] The purpose of the present invention is to provide a method for smelting metal magnesium by microwave vacuum decomposition, which solves the problems of poor environmental protection, high energy consumption and high cost in the current metal magnesium smelting, and realizes high efficiency, low energy consumption and low emission of the magnesium smelting process

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  • Method for smelting magnesium by decomposition in vacuum through microwaves

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Embodiment Construction

[0048] The raw materials used in the examples include magnesia, lime, dolomite, and ferrosilicon. The mass content of MgO in magnesia is 92%, the mass content of CaO in lime is 85%, the ferrosilicon is 75% ferrosilicon, the mass content of CaO in dolomite is 28.2%, and the mass content of MgO is 19.4%. The main reactor is a 10kg class microwave vacuum furnace equipped with a magnesium vapor condensing system. First, crush magnesia, lime, and ferrosilicon respectively, then mix them evenly according to the ratio in Table 2, press the balls, put a certain amount of balls into a microwave vacuum furnace, and evacuate to the required vacuum degree (see Table 2), and then Heating to the required temperature, keeping it warm for a certain period of time, analyzing the grade of magnesium metal and the amount of residual MgO in the pellet sample after power off, and calculating the decomposition rate of MgO, the results are shown in Table 2. In the test, dolomite was also calcined in...

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Abstract

The invention relates to a method for smelting magnesium by decomposition in vacuum through microwaves, and belongs to the field of magnesium smelting. The method comprises the following steps: firstly, crushing raw materials of magnesia, lime and ferrosilicon, then evenly mixing the crushed materials according to the proportions, pressing into balls, carrying out microwave-heating in a microwavevacuum reactor to resolve the magnesia into gaseous magnesium, and condensing to obtain crude magnesium. The invention is characterized in that the technical parameters are as follows: the reaction temperature in the microwave vacuum reactor is 1250-1450 DEG C, and the vacuum degree is 20-1000 Pa; the proportion of the lime to the magnesia is 0.5:1-1.5:1, and the proportion of ferrosilicon to themagnesia is 0.44-0.65:1; and the heating time is 1-5 hours. Compared with the prior Pidgeon process for smelting magnesium, the invention has the characteristics of high efficiency, low energy consumption, low pollution, low production cost, low fixed investment and the like.

Description

technical field [0001] The invention belongs to the field of metal magnesium smelting, and in particular provides a method for smelting metal magnesium by microwave vacuum decomposition, which is suitable for preparing crude metal magnesium by using the microwave method. Background technique [0002] my country's magnesium industry has developed rapidly in recent years. In 2007, the global output of primary magnesium was 773,000 tons. In 2008, China's primary magnesium production accounted for 85% of the world's total primary magnesium production, and my country's dolomite reserves exceeded 7 billion tons. After decades of development, China's magnesium resource advantages have transformed into industrial advantages. Since 1992, my country has changed from a magnesium importer to an important magnesium exporter in the world. In response to global climate change and energy conservation and emission reduction, magnesium smelting technology has attracted worldwide attention. ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B26/22
Inventor 赵沛刘光火郭培民刘沈杰庞建明
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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