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Preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by preparation method

A technology of metal magnesium and minerals, applied in the field of metal materials, can solve the problems of high energy consumption and low efficiency, and achieve the effects of low energy consumption, high efficiency and fast chlorination speed

Inactive Publication Date: 2012-07-18
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The purpose of the present invention is mainly to seek an energy-saving and efficient metal magnesium preparation method and equipment to solve the problems of large energy consumption and low efficiency in the existing methods

Method used

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  • Preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by preparation method
  • Preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by preparation method
  • Preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Embodiment 1: certain magnesite test ore sample chemical multi-element analysis result is as follows:

[0032] element MgO SiO 2 CaO Fe 2 o 3 Loss on ignition content 42.95 6.08 1.15 0.29 48.27

[0033] The ore sample was crushed to -2mm by a hammer crusher, and the ore sample was lightly burned in a fluidized bed at a controlled temperature of 900°C for 1 hour, and then ground to -100 mesh by a ball mill. Take 500 g of the lightly burned product, add 800 mL of 10% HCl to react for 25 minutes, and then filter. The filtrate is adjusted to pH 4.5 with freshly digested milk of lime and filtered to remove impurities to obtain a pure filtrate. Fresh milk of lime was added to the purified filtrate at a rate of 10 mL / min, and the amount added was C Ca 2+ : C Mg 2+ = 0.9, the temperature of the water bath was 80°C under the condition of stirring for 1 h, and aging for 2 h. Mg(OH) obtained by filtration after aging 2 With 1mol / mL MgCl ...

Embodiment 2

[0035] Embodiment 2: adopting Qinghai Province Chaerhan Salt Lake bicholorite as raw material, its composition is as follows:

[0036] element Mg Cl - Ca K Na content 11.5 35.08 0.032 0.094 0.079

[0037] Take 500 grams of bischofite and add a certain amount of water to prepare a solution containing about 100 g / L of magnesium ions, filter to remove insoluble impurities, then add a certain amount of ammonia water and 10% seed crystals, in a water bath at 80 °C Make it fully react to form magnesium hydroxide precipitate, separate the magnesium hydroxide by vacuum filtration, put it into the muffle furnace for calcination, the calcination temperature is 900°C, and calcine for 1 hour, the magnesium oxide content of the product obtained is greater than 99.28%.

[0038] Under the situation of not adding catalytic reaction intermediate, carry out following steps with embodiment 1, it finally obtains metal magnesium 18.68 grams, and purity is 99.56...

Embodiment 3

[0039] Embodiment 3: certain iron tailings composition is as follows:

[0040] Element Fe 2 o 3 MgO SiO 2 CaO Al 2 o 3 MnO K 2 o Na 2 o content% 28.36 31.28 35.63 4.68 1.22 0.36 0.28 0.32

[0041] Grind 500 grams of iron tailings through a corundum ball mill to -100 mesh, and use 20% sulfuric acid for acid leaching reaction. The reaction temperature is 90 ° C, and the reaction time is 2 hours. After the reaction is completed, filter to obtain a crude magnesium sulfate solution. Add a certain concentration of sodium hydroxide to the solution and pass through chlorine gas to remove impurities in the form of precipitation to obtain a pure magnesium sulfate solution, and then use ammonium bicarbonate as a precipitant at a reaction temperature of 60 ° C to obtain Magnesium carbonate was precipitated, and after separation by suction filtration, the filter cake was calcined at 900°C for 2 hours to obtain magnesium oxide with a purit...

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Abstract

The invention belongs to the field of metal material, and relates to a preparation method of metal magnesium by magnesium-containing mineral and equipment adopted by the preparation method. The method comprises the following steps of: converting useful components in magnesium-containing mineral into high-activity magnesium oxide, and under the effects of high temperature and a catalytic midbody, enabling the high-activity magnesium oxide to have chlorination reaction with chlorine and carbon monoxide, so that molten magnesium chloride anhydrous is generated; and mixing the molten magnesium chloride anhydrous with the other molten inorganic salt according to a certain proportion to be taken as electrolyte, and leading the electrolyte into a multi-polarity electrolytic cell to electrolyze, so that the metal magnesium is prepared. The technology adopts the fluidzed chlorination bed and the multi-polarity electrolytic cell of the novel equipment, and adds the midbody of catalytic reaction in the process of chlorination, so that the preparation method is more high-efficiency and energy-saving compared with the conventional method. The waste gas and the waste residue generated in the whole process are treated to be reused, so that the preparation method and the equipment are environment-friendly.

Description

technical field [0001] The invention particularly relates to a method and equipment for preparing metal magnesium from magnesium-containing minerals, belonging to the field of metal materials. Background technique [0002] Magnesium has the advantages of abundant reserves, light weight, high specific strength and specific stiffness of magnesium alloy, excellent thermal and electrical conductivity, good damping and shock absorption and electromagnetic shielding performance, easy processing and molding, and easy recycling of waste materials. "Time Metal" is displayed in the metallurgical industry and has become a leader in non-ferrous metals, which are widely used in aerospace, military, transportation and other fields. [0003] my country is a famous "magnesium country" in the world. At present, magnesium-containing mineral resources with industrial application value mainly include magnesite, dolomite, bischofite, carnallite and magnesium-containing tailings, etc., which can...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C3/04
Inventor 冯雅丽李浩然王维大
Owner UNIV OF SCI & TECH BEIJING
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