Method for preparing anhydrous magnesium chloride

A technology of anhydrous magnesium chloride and magnesium chloride, which is applied in the direction of magnesium chloride and magnesium halide, can solve the problems of cumbersome operation, high cost, and long time consumption, and achieve the effect of simple process, low equipment requirements, and low cost

Active Publication Date: 2014-07-16
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the disadvantages of preparing anhydrous magnesium chloride in the prior art su

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  • Method for preparing anhydrous magnesium chloride

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preparation example Construction

[0024] see figure 1 , figure 1 The step flowchart 100 of the preparation method of the anhydrous magnesium chloride provided for the embodiment of the present invention, from figure 1 Visible in, the preparation method of anhydrous magnesium chloride comprises the steps:

[0025] Step S110: dehydrating bischofolite to form magnesium chloride tetrahydrate;

[0026] Specifically, bischofite is placed in a multi-chamber fluidized bed, and fluidized at a temperature of 75 to 85°C for 20 to 30 minutes to remove the adsorbed water on its surface;

[0027] Then fluidize the bischofite treated in the above steps at a temperature of 105-115° C. for 20-30 minutes to remove crystal water to obtain the magnesium chloride tetrahydrate.

[0028] Preferably, bischofite is Yantian bischofite. It can be understood that the present invention uses bischofite as a raw material, fully utilizes the rich salt lake brine resources in western my country, and has low cost.

[0029] Step S120: dehy...

Embodiment 1

[0040] Put Yantian bischofolite in a multi-chamber fluidized bed, first fluidize it at 75-85°C for 20 minutes to remove its surface adsorption water, then heat it at 105-115°C for 20 minutes to remove two crystal waters, and become Magnesium chloride tetrahydrate;

[0041] The above-mentioned magnesium chloride tetrahydrate was heated at 180°C for 30 minutes to remove two crystal waters to obtain magnesium chloride dihydrate; wherein, the magnesium oxide content in the magnesium chloride dihydrate was 0.2%, and the water content was 27%;

[0042] Put 2 kg of the above-mentioned magnesium chloride dihydrate into a dehydration reactor, and melt for 30 minutes under the conditions of a temperature of 700° C. and a vacuum of 50 mmHg to obtain a melt;

[0043] The above-mentioned molten matter is kept warm and clarified in the dehydration reactor for 40 minutes, and then the supernatant is poured out;

[0044] The clear liquid is naturally cooled to obtain flaky anhydrous magnesiu...

Embodiment 2

[0046] Put Yantian bischofolite into a multi-chamber fluidized bed, first fluidize it at 75-85°C for 25 minutes to remove its surface adsorption water, then fluidize it at 105-115°C for 25 minutes to remove two crystal waters, and become Magnesium chloride tetrahydrate;

[0047] The above-mentioned magnesium chloride tetrahydrate was fluidized at 180° C. for 35 minutes to remove two crystal waters to obtain magnesium chloride dihydrate; wherein, the magnesium oxide content in the magnesium chloride dihydrate was 0.3%, and the water content was 26%;

[0048] Put 2 kg of the above-mentioned magnesium chloride dihydrate into a dehydration reactor, and melt for 35 minutes under the conditions of a temperature of 720° C. and a vacuum of 60 mmHg to obtain a melt;

[0049] The above-mentioned molten matter is kept warm and clarified in the dehydration reactor for 45 minutes, and then the supernatant is poured out;

[0050] The clear liquid is naturally cooled to obtain flaky anhydro...

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Abstract

The invention provides a method for preparing anhydrous magnesium chloride. The method comprises steps of dehydrating bischofite so as to form magnesium chloride tetrahydrate, then dehydrating magnesium chloride tetrahydrate so as to obtain magnesium chloride dihydrate, fusing magnesium chloride dihydrate so as to obtain melt, keeping the melt warm and clarifying the melt so as to obtain supernatant liquid, and cooling the supernatant liquid so as to obtain anhydrous magnesium chloride. The method is simple, has low requirements on equipment, and is easy for industrial production.

Description

【Technical field】 [0001] The invention relates to a preparation method of a magnesium compound, in particular to a preparation method of anhydrous magnesium chloride. 【Background technique】 [0002] Anhydrous magnesium chloride is the raw material for electrolytic metal magnesium, and also an important raw material for preparing catalysts and pharmaceutical intermediates. At present, the methods for producing anhydrous magnesium chloride mainly include: using magnesite as raw material to calcine magnesite at high temperature to obtain anhydrous magnesium chloride through chlorination; using hydrated magnesium chloride, carnallite, and brine as raw materials for dehydration Preparation of anhydrous magnesium chloride. However, the above method has problems such as long process flow, low raw material utilization rate, high production cost, and environmental pollution; in addition, the main equipment for producing anhydrous magnesium chloride is a fluidized bed, and the main d...

Claims

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Application Information

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IPC IPC(8): C01F5/34
Inventor 都永生孙庆国马培华褚敏雄火焱李明珍王世栋韩继龙
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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