Preparation method of high-purity magnesium fluoride

A pure magnesium fluoride and magnesium oxide technology, applied in magnesium fluoride, magnesium halide, silicon oxide and other directions, can solve the problem of high production cost, achieve good economic value and social value, reduce production cost, and be easy to popularize and apply.

Inactive Publication Date: 2008-03-05
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional production method of magnesium fluoride is produced by the reaction of hydrofluoric

Method used

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  • Preparation method of high-purity magnesium fluoride

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Embodiment 1

[0018] The preparation method of high-purity magnesium fluoride of the present invention, with fluosilicic acid and magnesium oxide as raw material, specifically comprises the following steps:

[0019] (1) reacting a fluorosilicate solution with a concentration of 15% and magnesium oxide solid for 40 minutes, filtering to obtain a magnesium fluorosilicate solution, concentrating and crystallizing to obtain magnesium fluorosilicate hexahydrate;

[0020] (2) decomposing magnesium fluorosilicate hexahydrate at a temperature of 200° C. for 4 hours to generate solid magnesium fluoride and silicon tetrafluoride gas and water vapor;

[0021] (3) Absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 15% fluorosilicic acid solution, return it to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

Embodiment 2

[0023] The preparation method of high-purity magnesium fluoride of the present invention, with fluosilicic acid and magnesium oxide as raw material, specifically comprises the following steps:

[0024] (1) react 25% fluosilicic acid solution and 30% magnesium oxide slurry for 30 minutes, filter to obtain magnesium fluosilicate solution, concentrate and crystallize to obtain magnesium fluosilicate hexahydrate;

[0025] (2) Decompose magnesium fluorosilicate hexahydrate at a temperature of 300° C. for 3 hours to generate solid magnesium fluoride and silicon tetrafluoride gas and water vapor;

[0026] (3) Absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 25% fluorosilicic acid solution, return it to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

Embodiment 3

[0028] The preparation method of high-purity magnesium fluoride of the present invention, with fluosilicic acid and magnesium oxide as raw material, specifically comprises the following steps:

[0029] (1) Reacting a 35% fluosilicic acid solution and a 20% magnesium oxide slurry for 20 minutes, filtering to obtain a magnesium fluosilicate solution, concentrating and crystallizing to obtain magnesium fluosilicate hexahydrate;

[0030] (2) Decompose magnesium fluorosilicate hexahydrate at a temperature of 400° C. for 2 hours to generate solid magnesium fluoride and silicon tetrafluoride gas and water vapor;

[0031] (3) Absorb and hydrolyze silicon tetrafluoride gas and water vapor with water, filter to obtain 35% fluorosilicic acid solution, return it to make magnesium fluorosilicate, wash and dry the silicon dioxide solid to obtain white carbon black.

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Abstract

The present invention relates to process of preparing high purity magnesium fluoride with fluorosilicic acid and magnesia as material. The process includes the following steps: 1. reacting fluorosilicic acid solution and magnesia for 10-60 min, filtering to obtain solid magnesium fluorosilicate solution, and concentrating to obtain crystal magnesium fluorosilicate hexahydrate; 2. decomposing magnesium fluorosilicate at 100-500 deg.c for 1-5 hr to produce solid magnesium fluoride product, silicon tetrafluoride gas and water vapor; and 3. absorbing silicon tetrafluoride gas and water vapor with water and hydrolyzing, filtering to obtain fluorosilicic acid solution to be returned to the step 1 and solid silica, and washing and drying silica to obtain carbon white. The process utilizes fluorosilicic acid as one side product of phosphate fertilizer production as one main material, and has low cost and environment friendship.

Description

technical field [0001] The invention relates to a method for preparing high-purity magnesium fluoride, in particular to a method for preparing high-purity magnesium fluoride by using fluosilicic acid and magnesium oxide as raw materials. Background technique [0002] Magnesium fluoride is mainly used for smelting metal aluminum, flux for manufacturing ceramics and glass, coatings for lenses and filters in optical instruments, fluorescent materials for cathode ray screens, antireflective agents and soldering agents for optical lenses, and titanium pigments paints, etc. The traditional production method of magnesium fluoride is the reaction between hydrofluoric acid and magnesium oxide. Hydrofluoric acid is used as raw material, and the production cost is high. Contents of the invention [0003] The purpose of the invention is to provide a method for preparing high-purity magnesium fluoride, so as to greatly reduce the production cost and turn waste into wealth. [0004] I...

Claims

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Application Information

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IPC IPC(8): C01F5/28C01B33/113
Inventor 李世江侯红军杨华春皇甫根利闫春生贾雪枫范晓磊
Owner DO FLUORIDE CHEM CO LTD
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