Method for preparing anhydrous magnesium chloride by utilizing magnesium oxide

A technology of anhydrous magnesium chloride and magnesium oxide, which is applied in the direction of magnesium chloride, magnesium halide, etc., can solve the problems of low utilization rate of gas chlorination agent, low utilization rate of gas chlorination agent, and difficult uniform dispersion of gas, so as to reduce environmental protection investment The effect of cost reduction, shortened production process, and easy operation and control

Active Publication Date: 2012-06-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using gas chlorinating agent (HCl or Cl 2 ) In the melt, the preparation containing anhydrous magnesium chloride melt mainly has the following problems: a) the gas chlorination agent utilization rate is not high, because the gas is difficult to realize uniform dispersion in the melt, and needs to keep enough chlorine in the whole melt Magnesium oxide can be converted into magnesium chloride only when the gas concentration is reduced, especially when the magnesium oxide content in the melt is low, the gas chlorination agent utilization rate is very low; b) the recycling of the hydrochloric hydrogen gas obtained during dehydration requires a complex drying system, and this System cost and operating cost are high

Method used

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  • Method for preparing anhydrous magnesium chloride by utilizing magnesium oxide
  • Method for preparing anhydrous magnesium chloride by utilizing magnesium oxide

Examples

Experimental program
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Effect test

Embodiment 1

[0064] Mix 3.50g of magnesium oxide and 14.10g of ammonium chloride and add them into a 50ml crucible. Then, 16.00g of sodium chloride was covered on the mixture of magnesium oxide and ammonium chloride, and the crucible was covered with a lid and then kept at 410°C for 1.5 hours, and then at 700°C for 0.5 hours to obtain a layered layer. The upper layer is sodium chloride and the lower layer is anhydrous magnesium chloride. In this embodiment, based on the addition of 1.00 parts by weight of magnesium oxide, the addition of ammonium chloride is 4.03 parts by weight, and the addition of sodium chloride is 4.57 parts by weight.

[0065] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result is as follows:

[0066] Carry out XRD phase analysis on the sample composition, the composition is anhydrous MgCl 2 ,Such as figure 1 shown.

[0067] Titrate the magnesium ions and chloride ions in the sample, and the result is ...

Embodiment 2

[0070] Mix 3.50g of magnesium oxide and 28.80g of ammonium chloride and add them into a 50ml crucible. Then, 10.00 g of alumina was covered on the mixture of magnesia and ammonium chloride, and the crucible was covered and kept at a temperature of 410° C. for 1.5 hours, and then at 700° C. for 0.3 hours. In this way, the upper layer of alumina and the lower layer of anhydrous magnesium chloride with obvious layering are obtained. In this embodiment, based on 1.00 parts by weight of magnesium oxide, 8.23 ​​parts by weight of ammonium chloride and 2.86 parts by weight of alumina are added.

[0071] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result is as follows:

[0072] Carry out XRD phase analysis on the sample composition, the composition is anhydrous MgCl 2 .

[0073] Titrate the magnesium ions and chloride ions in the sample, and the result is Cl - :Mg 2+ =1.999: 1, the calculated weight of anhydrous magn...

Embodiment 3

[0076] Mix 3.50g of magnesium oxide and 23.50g of ammonium chloride and add them into a 50ml crucible. Then, the crucible was kept covered at a temperature of 410°C for 1.5 hours, and then kept at 700°C for 0.3 hours. In this way, anhydrous magnesium chloride is obtained. In this embodiment, the amount of ammonium chloride added is 6.71 parts by weight based on the amount of magnesium oxide added as 1.00 parts by weight.

[0077] The obtained anhydrous magnesium chloride was characterized according to the above measurement method. The result is as follows:

[0078] Carry out XRD phase analysis on the sample composition, the composition is anhydrous MgCl 2 .

[0079] Titrate the magnesium ions and chloride ions in the sample, and the result is Cl - : Mg 2+ =1.98:1, the calculated weight of anhydrous magnesium chloride is 99.68% of the total mass of the sample; the precipitate after water dissolution in the sample is titrated, and the weight of magnesium oxide is 0.44% of ...

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Abstract

The invention relates to a method for preparing anhydrous magnesium chloride by utilizing magnesium oxide. The method comprises the following steps of: (1) mixing magnesium oxide and ammonium chloride uniformly to obtain a mixture of the magnesium oxide and the ammonium chloride; and (2) placing a covering above the mixture, heating and reacting to obtain the anhydrous magnesium chloride. In the anhydrous magnesium chloride prepared by the method, the content of the magnesium oxide is within 0.5 weight percent, so the anhydrous magnesium chloride can be used for producing magnesium by an electrolytic process directly. By the method for preparing the anhydrous magnesium chloride, the production process of the anhydrous magnesium chloride can be shortened, the production efficiency can be improved, the production cost can be reduced, and the environment-friendly investment cost can be reduced.

Description

technical field [0001] The present invention relates to a preparation method of anhydrous magnesium chloride, specifically, the present invention relates to a method of utilizing magnesium oxide to prepare anhydrous magnesium chloride, and the anhydrous magnesium chloride prepared by the method can be directly used as a raw material for producing metal magnesium by electrolysis . Background technique [0002] The key link in the production of metal magnesium by electrolytic magnesium chloride is the preparation of anhydrous magnesium chloride. The method for preparing anhydrous magnesium chloride has: [0003] (1) Magnesium oxide chlorination to prepare anhydrous magnesium chloride method (IG Farben method), which is to react agglomerates of magnesium oxide and reducing agent carbon with chlorine gas in an electric heating shaft furnace (about 800 ° C) to prepare molten anhydrous magnesium chloride , its disadvantages are low production efficiency, low utilization rate of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/32
Inventor 卢旭晨张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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