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A method for producing high-purity magnesium chloride by utilizing magnesium halide crystals

A technology of anhydrous magnesium chloride and halogen crystals, which is applied in the direction of magnesium chloride and magnesium halide, can solve the problems of reducing current efficiency, increasing production costs, and corroding electrodes, and achieves the effect of inhibiting hydrolysis

Active Publication Date: 2016-06-29
格尔木同兴盐化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the process of electrolytic magnesium smelting, the presence of magnesium oxide will corrode the electrodes, reduce the current efficiency in the electrolytic process, and thus significantly increase the production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0020] Low hydrated ammonium carnallite MgCl 2 ·NH 4 Cl nH 2 Preparation of O(n ≤ 1.0)

[0021] 30 grams of halogen crystal (MgCl 2 content of about 46%) was dissolved in 100 grams of water, and filtered to remove insoluble impurities to obtain MgCl 2 solution.

[0022] with MgCl 2 :NH 4 Add NH to the solution with a Cl molar ratio of 1:1.1 4 Cl, after fully stirring and dissolving, adjust the pH value of the solution to 6.0; under the condition of keeping stirring, heat the solution to 80°C to evaporate and crystallize for 1 hour, then place it in an ice-water bath to cool and crystallize for 4 hours, filter and dry to obtain ammonium light Halite MgCl 2 ·NH 4 Cl 6H 2 O; subsequently, ammonium carnallite was heated at 160 °C for 5 hours to obtain the low-hydrate ammonium carnallite MgCl 2 ·NH 4 Cl nH 2 O(n≤1.0).

[0023] Hexaammine Magnesium Chloride MgCl 2 6NH 3 preparation of

[0024] Dissolve low hydrated ammonium carnallite in metha...

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PUM

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Abstract

The invention discloses a method for preparing ultra-high-purity anhydrous magnesium chloride from magnesium chloride hexahydrate, which comprises the following steps: preparing a MgCl2 solution from magnesium chloride hexahydrate, preparing partially hydrated ammonium carnallite from the MgCl2 solution, reacting in a hexamethylentetramine-containing and ammonia-saturated methanol solution system to prepare magnesium chloride hexaammonate, and calcining to generate the anhydrous magnesium chloride. In the method, the addition of hexamethylentetramine can effectively inhibit hydrolysis of MgCl2, thus in turn avoiding formation of MgO in the final product. The purity of the finally obtained anhydrous magnesium chloride can be up to 99.9% or above, and the magnesium oxide content is no more than 0.03%.

Description

technical field [0001] The invention belongs to the technical field of inorganic salt purification, and in particular relates to a method for preparing ultra-high-purity anhydrous magnesium chloride by utilizing halogen crystals. Background technique [0002] As a light non-ferrous metal material, magnesium has a wide range of applications. At present, the methods for producing metal magnesium mainly include thermal reduction method and electrolysis method. Among them, the thermal reduction method has high energy consumption, backward technology and poor production conditions; while the electrolytic method has advanced technology and low energy consumption, which is a very promising magnesium smelting method. The key to electrolytic magnesium smelting is to prepare high-purity anhydrous magnesium chloride in advance, while reducing the content of magnesium oxide as much as possible. During the electrolytic magnesium smelting process, the presence of magnesium oxide will co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F5/30
CPCC01F5/30C01P2006/80
Inventor 陈福顺
Owner 格尔木同兴盐化有限公司