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Process for preparing anhydrous magnesium chloride by dewatering bischofite

An anhydrous magnesium chloride, bischite technology, applied in magnesium chloride, magnesium halide and other directions, can solve the problems of no process equipment discussion, no proposed implementation method, and many impurities in the product, and achieves simple structure, convenient operation, and reduced production. cost effect

Inactive Publication Date: 2007-04-11
TSINGHUA UNIV
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Problems solved by technology

The disadvantage of this method is that multi-step separation is required, the energy consumption is large, and the product has many impurities, which has an adverse effect on subsequent electrolysis.
Yet US3962408 does not propose exact realization method, does not carry out further discussion with regard to specific technological process and required equipment

Method used

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  • Process for preparing anhydrous magnesium chloride by dewatering bischofite
  • Process for preparing anhydrous magnesium chloride by dewatering bischofite
  • Process for preparing anhydrous magnesium chloride by dewatering bischofite

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preparation example Construction

[0030] 2) Preparation of aniline hydrochloride-magnesium chloride hexahydrate double salt: mix bischofite and aniline hydrochloride in a mol ratio of 1.1:1, in order to mix evenly for each material, add water with a molar ratio of 0.2 to 2 relative to aniline hydrochloride, Stir at 85°C and dissolve into a homogeneous phase.

[0031] 3) Drying and granulation of double salt: adopt the spray drying granulation method, send the double salt solution into the granulation nozzle, spray it into the high-temperature drying tower, control the temperature within the range of 100-130°C, and use the high-speed flow in the tower The hot air dries the double salt solution sprayed out of the granulation nozzle instantly to form particles of uniform size. The double salt particles with uniform size are collected by the principle of gravity, and cooled to form double salt particles suitable for fluidization without adsorbed water.

[0032] 4) Dehydration of double salt in a fluidized bed: Du...

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Abstract

The present invention relates to chemical and metallurgical technology, and is especially process of preparing anhydrous magnesium chloride through dewatering bischofite. The process includes the first reaction of aniline hydrochloride and bischofite to produce aniline hydrochloride-magnesium chloride hexahydrate complex salt, the subsequent spray drying and pelletizing the complex salt, and final eliminating crystallized water and aniline hydrochloride in a fluidized bed to obtain the anhydrous magnesium chloride product. The present invention has the advantages of low power consumption, simple technological process, easy industrial amplification, environment friendship, stable product quality, etc.

Description

field of invention [0001] The invention belongs to the technical field of preparation of chemical and metallurgical raw materials, in particular to a method for preparing anhydrous magnesium chloride through dehydration of bischofite by using amine hydrochloride and bischofite to form a double salt and then decomposing it. technical background [0002] Magnesium is an important non-ferrous metal, lighter than aluminum, and can form high-strength alloys with other metals, and has a wide range of applications. Magnesium smelting methods include silicothermal method and electrolysis method. Due to the high energy consumption and poor environmental protection conditions of silicon thermal method, electrolysis method is a new production process, and its industrial application is gradually expanding. Electrolytic magnesium smelting requires high-purity anhydrous magnesium chloride as raw material. Anhydrous magnesium chloride is an important chemical and metallurgical raw material...

Claims

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Application Information

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IPC IPC(8): C01F5/34
Inventor 吴玉龙杨明德党杰胡湖生陈镇张建安
Owner TSINGHUA UNIV
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