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Method for directly preparing electrolyte melt containing anhydrous magnesium chloride by using magnesium oxide

A technology of anhydrous magnesium chloride and magnesium oxide, which is applied in the direction of magnesium chloride and magnesium halide, can solve the problems of low utilization rate of gas chlorinating agent, low utilization rate of gas chlorinating 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: 2014-12-24
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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0070] 21.0 g of magnesium oxide and 84.6 g of ammonium chloride were equally added to six 50 ml crucibles and uniformly mixed to obtain a mixture. Then, 97.8 g of potassium chloride was equally added to six 50 ml crucibles, and the temperature was raised to 780° C. to form a molten state, thereby obtaining a molten liquid. The melt was then slowly poured into a crucible containing a mixture of magnesia and ammonium chloride so that the melt completely covered the mixture. Put a lid on the crucible and let it stand at room temperature for 2-3 minutes, then put it into a furnace at 720° C. for 1.5 hours, and thus obtain 147.7 g of an electrolyte melt containing 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 potassium chloride is 4.66 parts by weight.

[0071] The resulting anhydrous magnesium chloride-containing electrolyte melt wa...

Embodiment 2

[0076] 21.0 g of magnesium oxide and 84.6 g of ammonium chloride were equally added to six 50 ml crucibles and uniformly mixed to obtain a mixture. Then, 76.8 g of sodium chloride was added to six 50 ml crucibles on average, and the temperature was raised to 810° C. to form a molten state, thereby obtaining a molten liquid. The melt was then slowly poured into a crucible containing a mixture of magnesia and ammonium chloride so that the melt completely covered the mixture. After the crucible was covered and allowed to stand at room temperature for 2-3 minutes, it was placed in a furnace at 720° C. for 1.5 hours, and 126.7 g of an electrolyte melt containing anhydrous magnesium chloride was obtained. 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 3.66 parts by weight.

[0077] The resulting anhydrous magnesium chloride-containing electrolyte ...

Embodiment 3

[0082] 21.0 g of magnesium oxide and 84.6 g of ammonium chloride were equally added to six 50 ml crucibles and uniformly mixed to obtain a mixture. Then, 167.4 g of potassium chloride and 131.4 g of sodium chloride were averagely added to six 50 ml crucibles, and the temperature was raised to 750° C. to form a molten state, thereby obtaining a molten liquid. The melt was then slowly poured into a crucible containing a mixture of magnesia and ammonium chloride so that the melt completely covered the mixture. Put a lid on the crucible and let it stand at room temperature for 2-3 minutes, then put it into a furnace at 720° C. for 1.5 hours, and thus obtain 348.7 g of an electrolyte melt containing anhydrous magnesium chloride. In this embodiment, based on the addition of magnesium oxide as 1.00 parts by weight, the addition of ammonium chloride is 4.03 parts by weight, the addition of potassium chloride is 7.97 parts by weight, and the addition of sodium chloride is 6.26 parts by...

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Abstract

The invention provides a method for directly preparing an electrolyte melt containing anhydrous magnesium chloride by using magnesium oxide. The method comprises the steps that: (a) magnesium oxide and ammonium chloride are uniformly mixed, such that a mixture of magnesium oxide and ammonium chloride is prepared; (b) a chloride raw material is heated to a molten state, such that a molten liquid is obtained, wherein the chloride raw material is selected from the following components: potassium chloride; sodium chloride; potassium chloride and sodium chloride; and potassium chloride, sodium chloride and calcium chloride; and (c) the mixture of magnesium oxide and ammonium chloride obtained in the step (a) and the molten liquid obtained in the step (b) are mixed; and the mixture is dehydrated, such that the electrolyte melt containing anhydrous magnesium chloride is prepared. According to the invention, the production process for producing metal magnesium with an electrolysis method is shortened, production efficiency is improved, production cost is reduced, and environment-protection input cost is reduced.

Description

technical field [0001] The invention relates to a method for preparing an electrolyte melt containing anhydrous magnesium chloride. The electrolyte melt containing anhydrous magnesium chloride prepared by the method can be directly used for producing metal magnesium by an electrolysis method. 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 chlorine gas and large investment in tail gas treatment, and there are chlorinated hydroca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/34C25C3/04
Inventor 卢旭晨张志敏
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI