Preparation of magnesium fluoride

A production method and technology of magnesium fluoride, applied in the directions of magnesium fluoride, magnesium halide, ammonium halide, etc., can solve the problems of high price of high-purity magnesium salt and high price of magnesium fluoride

Inactive Publication Date: 2009-03-04
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is an urgent need to find a new magnesium salt to solve the problem

Method used

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  • Preparation of magnesium fluoride

Examples

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Embodiment 1

[0020] The production method of magnesium fluoride of the present invention is to take ammonium fluoride, magnesium chloride as raw material, comprises the following steps:

[0021] (1) The ammonium fluoride solution with a concentration of 35% and the magnesium chloride solution with a concentration of 36% are added to the reactor at the same time in a molar ratio of 2:1, and the reaction generates magnesium fluoride slurry;

[0022] (2) Filter the obtained magnesium fluoride slurry to obtain magnesium fluoride ointment, wash it with hot water at 60°C, dry the magnesium fluoride ointment at 250°C for 2 hours after washing, and obtain magnesium fluoride finished product.

[0023] In addition, the filtered mother liquor in step (2) can be concentrated to obtain the ammonium chloride product.

[0024] The ammonium fluoride in this example is produced by the ammonolysis reaction of fluosilicic acid, a by-product of the phosphate fertilizer industry, and ammonia water.

Embodiment 2

[0026] The production method of magnesium fluoride of the present invention is to take ammonium fluoride, magnesium chloride as raw material, comprises the following steps:

[0027] (1) 40% ammonium fluoride solution and 30% magnesium chloride solution are added to the reaction kettle at the same time in a molar ratio of 2:1, and the reaction generates magnesium fluoride slurry;

[0028] (2) Filter the obtained magnesium fluoride slurry to obtain magnesium fluoride ointment, wash it with hot water at 60°C, and dry the magnesium fluoride ointment at 300°C for 1.5 hours after washing to obtain magnesium fluoride finished product.

[0029] In addition, the filtered mother liquor in step (2) can be concentrated to obtain the ammonium chloride product.

[0030] The ammonium fluoride in this example is produced by the ammonolysis reaction of fluosilicic acid, a by-product of the phosphate fertilizer industry, and ammonia water.

Embodiment 3

[0032] The production method of magnesium fluoride of the present invention is to take ammonium fluoride, magnesium chloride as raw material, comprises the following steps:

[0033] (1) 45% ammonium fluoride solution and 28% magnesium chloride solution are added to the reaction kettle at the same time in a molar ratio of 2:1, and the reaction generates magnesium fluoride slurry;

[0034] (2) Filter the obtained magnesium fluoride slurry to obtain magnesium fluoride ointment, wash it with hot water at 70°C, and dry the magnesium fluoride ointment at 400°C for 1 hour after washing to obtain magnesium fluoride finished product.

[0035] In addition, the filtered mother liquor in step (2) can be concentrated to obtain the ammonium chloride product.

[0036] The ammonium fluoride in this example is produced by the ammonolysis reaction of fluosilicic acid, a by-product of the phosphate fertilizer industry, and ammonia water.

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Abstract

The invention relates to a manufacturing method of magnesium fluoride, which takes ammonium fluoride and magnesium chloride as raw materials and comprises the steps as follows: (1) an ammonium fluoride solution whose concentration is 30 to 45 percent and a magnesium chloride solution whose concentration is 25 to 36 percent are added in a reaction kettle at the same time for reaction, and a magnesium fluoride ground-paste is generated; (2) the obtained magnesium fluoride ground-paste is filtered to prepare a magnesium fluoride paste which is cleaned by using hot water the temperature of which ranges from 60 to 70 DEG C; the magnesium fluoride paste is dried for 1 to 2 hours at the temperature ranging from 250 to 400 DEG C after washing, and the finished product of the magnesium fluoride is obtained. The manufacturing method adopts the ammonium fluoride instead of hydrofluoric acid, wherein, the ammonium fluoride can be obtained through the ammonolysis by adding ammonia water into fluosilicic acid that is a by-product in the phosphate fertilizer industry; the fluosilicic acid is the deleterious-waste which is the by-product during the phosphate fertilizer production process, has very little purpose, and badly influences the environmental protection; in the manufacturing method, the development and the utilization of the fluosilicic acid greatly relieve the environmental protection pressure of the phosphate fertilizer production and the influences on the surrounding environment; and the cost is lower and the material is easy to get because the fluosilicic acid is the by-product in a phosphate fertilizer factory, thereby lowering the manufacturing cost of the magnesium fluoride.

Description

technical field [0001] The invention relates to a production method of magnesium fluoride, in particular to a method for producing magnesium fluoride by using ammonium fluoride and magnesium chloride as raw materials. Background technique [0002] Magnesium fluoride is a colorless tetragonal crystal or powder, soluble in nitric acid, slightly soluble in dilute acid, hardly soluble in water and alcohol; it is mainly used as a flux in the manufacture of ceramics, glass, and smelting magnesium and aluminum metals; and Coating of lenses and filters in optical instruments; it can also be used as a fluorescent material for cathode ray screens, a refraction agent and soldering agent for optical lenses. [0003] The traditional production method of magnesium fluoride is to use different magnesium salts to react with hydrofluoric acid, mainly including magnesium carbonate method, magnesium oxide method, magnesium sulfate method, etc. The traditional method is to use hydrofluoric aci...

Claims

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Application Information

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IPC IPC(8): C01F5/28C01C1/16
Inventor 皇甫根利李世江侯红军杨华春闫春生贾雪峰范晓磊
Owner DO FLUORIDE CHEM CO LTD
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