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Method for preparing magnesium chloride and application of magnesium chloride prepared through method

A technology of magnesium chloride and anhydrous magnesium chloride, applied in the preparation/separation of magnesium chloride and ammonia, chemical instruments and methods, etc., to achieve the effects of simple process, reduced environmental protection pressure, and easy operation

Active Publication Date: 2019-01-29
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And the preparation method provided by the invention prepares magnesium chloride by solid-solid phase reaction, overcomes the defect of waste of resources and environmental pollution caused by using a large amount of solvents in the existing preparation method of magnesium chloride

Method used

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  • Method for preparing magnesium chloride and application of magnesium chloride prepared through method
  • Method for preparing magnesium chloride and application of magnesium chloride prepared through method
  • Method for preparing magnesium chloride and application of magnesium chloride prepared through method

Examples

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Effect test

Embodiment 1

[0045] The present embodiment provides a kind of preparation method of magnesium chloride, and described preparation method comprises the steps:

[0046] (1) mix ammonium chloride and magnesium carbonate, obtain mixture, the mol ratio of described ammonium chloride and described magnesium carbonate is 2:1.2;

[0047] (2) Preheat the mixture obtained in step (1) to 150° C. in a muffle furnace at a heating rate of 5° C. / min, and keep it warm for 10 minutes;

[0048] (3) Heating the mixture obtained in step (2) to 320° C. at a heating rate of 5° C. / min in a muffle furnace to 320° C., and heat treatment for 90 minutes to obtain anhydrous magnesium chloride, ammonia and carbon dioxide;

[0049] (4) recrystallization step (3) gained anhydrous magnesium chloride, obtains magnesium chloride product.

[0050] The XRD spectrum pattern of the anhydrous magnesium chloride that prepares is as figure 1 shown.

Embodiment 2

[0052] The present embodiment provides a kind of preparation method of magnesium chloride, and described preparation method comprises the steps:

[0053] (1) mix ammonium chloride and magnesium carbonate, obtain mixture, the mol ratio of described ammonium chloride and described magnesium carbonate is 2:1;

[0054] (2) Preheat the mixture obtained in step (1) to 140° C. in a muffle furnace at a heating rate of 3° C. / min, and keep it warm for 5 minutes;

[0055] (3) Heating the mixture obtained in step (2) to 240° C. at a heating rate of 4° C. / min in a muffle furnace to 240° C., and heat treatment for 120 minutes to obtain anhydrous magnesium chloride, ammonia and carbon dioxide;

[0056] (4) recrystallization step (3) gained anhydrous magnesium chloride, obtains magnesium chloride product.

Embodiment 3

[0058] The present embodiment provides a kind of preparation method of magnesium chloride, and described preparation method comprises the steps:

[0059] (1) mix ammonium chloride and magnesium carbonate, obtain mixture, the mol ratio of described ammonium chloride and described magnesium carbonate is 2:1.3;

[0060] (2) heating the mixture obtained in step (1) to 350° C. in a muffle furnace at a heating rate of 6° C. / min, and heating for 60 minutes to obtain anhydrous magnesium chloride, ammonia and carbon dioxide;

[0061] (3) recrystallization step (2) gained anhydrous magnesium chloride, obtains magnesium chloride product.

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Abstract

The invention relates to a method for preparing magnesium chloride. The preparation method comprising the steps of: (1) mixing ammonium chloride with magnesium carbonate so as to obtain a mixture; and(2) heating the mixture obtained in the step (1) so as to obtain anhydrous magnesium chloride, wherein both the ammonium chloride and the magnesium carbonate are solid. The preparation method has a simple and easy process, ammonium chloride which is a by-product of a soda ash preparation method is adopted as a reactant, and the product is magnesium chloride which can be applied to antifreeze liquid, snow melting agents, magnesium fertilizer, magnesium potassium fertilizer or a raw material for magnesium preparation through a molten electrolysis method; and by-products ammonia and carbon dioxide can be applied to preparation of soda ash. Through combination of the method for preparing magnesium chloride with a process for producing soda ash, zero discharge can be achieved, the requirementsof energy conservation and environmental protection can be met, and the economic benefits of enterprises are improved.

Description

technical field [0001] The invention belongs to the field of inorganic chemical industry and relates to a preparation method of inorganic salts, in particular to a preparation method of magnesium chloride and the use of the magnesium chloride prepared therefrom. Background technique [0002] Metal magnesium will be applied in the three major fields of aluminum alloy production, die-casting production, and steelmaking desulfurization, as well as rare earth alloys and metal reduction. The economical and environmentally friendly method for producing metal magnesium is the anhydrous magnesium chloride molten electrolysis method. [0003] Magnesium chloride can usually be prepared from bischofite as a raw material. The principle is that magnesium chloride hexahydrate, the main component in bischofite, gradually loses crystal water and is transformed into anhydrous magnesium chloride. CN 106673029A discloses a method for producing high-purity anhydrous magnesium chloride by utiliz...

Claims

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Application Information

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IPC IPC(8): C01F5/30C09K3/18C25C3/04C01C1/02C01B32/50C05D5/00C05D1/00C01D7/16
CPCC01C1/026C01D7/16C01F5/30C01P2002/72C05D1/00C05D5/00C09K3/185C25C3/04C01B32/50Y02P20/10Y02P20/141Y02P20/50
Inventor 袁俊生李非王军郭小甫魏华春
Owner HEBEI UNIV OF TECH
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