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Method for preparing magnesium metal and by-product by vacuum carbothermic reduction with serpentine minerals

A technology of serpentine and metal magnesium, which is applied in the field of reduction and preparation of metal magnesium, and achieves the effects of good crystallization, reduced pollution and easy recovery.

Inactive Publication Date: 2009-10-21
北京华夏建龙矿业科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Through the above background technology, it can be found that no matter the reducing agent is ferrosilicon, aluminum, silicon-aluminum alloy, carbon or carbide, the raw material is magnesium oxide and its mineral dolomite and magnesite, and another kind of magnesium Magnesium silicate mineral with huge reserves - serpentine is used to produce metal magnesium by direct thermal reduction method, but no relevant research has been carried out, and it is currently in a blank state in China

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  • Method for preparing magnesium metal and by-product by vacuum carbothermic reduction with serpentine minerals

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Embodiment 1

[0026] Embodiment 1 prepares the method for metallic magnesium and by-products with serpentine ore vacuum carbothermal reduction

[0027] Serpentine is a natural magnesium-containing silicate mineral. It is a metamorphic rock of olivine. It is a 1:1 type layered silicate mineral composed of silicon-oxygen tetrahedral wafers and magnesium hydroxide octahedral wafers. According to the shape of its internal structural layer, it is divided into lizardite, antigorite and fiber serpentine. Its theoretical composition is MgO43.0%, SiO 2 44.1%, H 2 O12.9%, but the composition and proportion of the actual minerals will be different, often containing Fe, Ni, Mn, Al and other mixed elements. The purpose of the test is to reduce the magnesium silicate minerals in serpentine to metal magnesium by thermal reduction of carbon (coke, coke coal, petroleum coke or graphite powder, etc.), and at the same time reduce the SiO in serpentine 3 2- Reduction to gaseous SiO, SiO reacts with CO or C...

Embodiment 2

[0048] Embodiment 2 Catalyst calcium fluoride addition is on the influence of magnesium recovery rate

[0049] The role of the catalyst calcium fluoride is mainly to destroy the structure of the serpentine crystal, and the amount of its addition plays an important role in the recovery rate of magnesium in the serpentine ore. Using the same preparation process as in Example 1, the effect of the added calcium fluoride on the recovery of magnesium was investigated by adjusting the proportion of the added calcium fluoride in the mixed raw material. The results are shown in Table 5. It can be seen that when the amount of calcium fluoride added is 1%, the recovery rate is 68.60%, which can be used in industrial production; when the amount of calcium fluoride is added at 1% to 4%, the recovery rate of magnesium increases significantly with the increase of calcium fluoride; At that time, the recovery rate of magnesium has tended to be stable, about 95-96%. It can be seen that when th...

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Abstract

The invention discloses a method for preparing a magnesium metal and a by-product by vacuum carbothermic reduction with serpentine minerals. The method comprises the following steps: using serpentine mineral powder as a raw material; adding a carbonaceous reducing agent which is 1 to 2 times of the theoretical quantity of carbon required for completely reducing magnesium silicate in the serpentine; adding a catalyst, and mixing the materials evenly to obtain a mixed raw material; pressing the mixed raw material into spherical or blocky ball agglomerations and drying the ball agglomerations; putting the dried ball agglomerations into a vacuum furnace, controlling the vacuum degree in the furnace to between 10 and 500 Pa, raising the temperature to between 500 and 700 DEG C, and keeping the temperature for 20 to 60 minutes to remove crystal water and clinker the materials; keeping the vacuum degree in the furnace, raising the temperature to between 1,200 and 1,500 DEG C, and reducing the magnesium silicate and oxides of metallic iron and nickel at a constant temperature for 30 to 60 minutes; and condensing magnesium vapor obtained from the reduction on a magnesium condenser into crystallized magnesium, recycling the metallic iron and the metallic nickel in the slag through magnetic separation, and preparing the slag after the magnetic separation into industrial silicon carbide through decarburization and purification.

Description

technical field [0001] The invention relates to a method for reducing and preparing magnesium metal, and in particular provides a method for preparing magnesium metal by reducing serpentine minerals with carbon in a vacuum, and by-producting silicon carbide, nickel metal and iron, belonging to the technical field of vacuum metallurgy . Background technique [0002] Magnesium is one of the most abundant light metals on earth. As a light metal material, the development and utilization of magnesium is far less mature than steel, copper, aluminum and other metals, and its potential has not been fully tapped. At present, the application of magnesium is mainly concentrated in the three major fields of aluminum alloy production, die-casting production, and steelmaking desulfurization, and it is also used in rare earth alloys, metal reduction and other fields. Magnesium alloy has light specific gravity, high specific strength and specific stiffness, good thermal and electrical con...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B26/22C22B7/04C22B23/00B03C1/00C01B31/36
CPCY02P10/20
Inventor 苑占永李启轩钟少燕刘忠信徐海涛张浩
Owner 北京华夏建龙矿业科技有限公司
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