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Production method for high-purity magnesium fluoride crystal

A pure magnesium fluoride and production method technology, applied in the direction of magnesium fluoride, magnesium halide, etc., can solve the problems of low recycling efficiency and high environmental pressure, achieve good economic benefits, reduce environmental pressure, and reduce production costs.

Inactive Publication Date: 2012-09-19
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Fluorosilicic acid is a by-product of anhydrous hydrofluoric acid and phosphate fertilizer industry. At present, the utilization of fluorine in fluosilicic acid is still in the production of low value-added sodium fluosilicate and other fluorides, and a large amount of waste liquid is also produced by-product. , resulting in low recycling benefits and high pressure on environmental protection

Method used

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  • Production method for high-purity magnesium fluoride crystal

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Effect test

Embodiment 1

[0016] The production method of the high-purity magnesium fluoride crystal of the present embodiment comprises the following steps:

[0017] (1) Mix industrial-grade magnesium carbonate with water, stir, and prepare a suspension of magnesium carbonate with a concentration of 10% by weight, and introduce CO into the suspension of magnesium carbonate 2 gas, CO 2 The partial pressure of the gas is 0.2 atmospheric pressure, the carbonization reaction is carried out for 40 hours, and the reaction temperature is controlled to be 30° C., and then the reaction solution A is obtained. The reaction solution A is a mixed solution of magnesium carbonate and magnesium bicarbonate, and is set aside;

[0018] (2) Take fluosilicic acid, a by-product of the phosphate fertilizer industry, and ammonolyze it to obtain an ammonium fluoride solution with a concentration of 50% by weight;

[0019] (3) Mix the reaction solution A obtained in step (1) with the ammonium fluoride solution obtained in s...

Embodiment 2

[0022] The production method of the high-purity magnesium fluoride crystal of the present embodiment comprises the following steps:

[0023] (1) Mix high-purity magnesium carbonate with water, stir, and prepare a suspension of magnesium carbonate with a concentration of 1% by weight, and pass CO into the suspension of magnesium carbonate 2 gas, CO 2 The partial pressure of the gas is 10 atmospheres, the carbonization reaction is carried out for 2 hours, and the reaction temperature is controlled to be 1° C., and then the reaction solution A is obtained. The reaction solution A is a mixed solution of magnesium carbonate and magnesium bicarbonate, and is set aside;

[0024] (2) Take fluosilicic acid, a by-product in the production process of anhydrous hydrofluoric acid, and ammonolyze it to obtain an ammonium bifluoride solution with a concentration of 5% by weight;

[0025] (3) Mix the reaction solution A obtained in step (1) with the ammonium bifluoride solution obtained in s...

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Abstract

The invention discloses a production method for a high-purity magnesium fluoride crystal. The production method for the high-purity magnesium fluoride crystal comprises the following steps: (1) mixing and stirring magnesium carbonate and water to prepare magnesium carbonate suspension, introducing CO2 gas into the magnesium carbonate suspension and performing carbonization to obtain reaction liquid A; (2) performing ammonolysis on fluosilicic acid to prepare ammonium fluoride solution or ammonium hydrogen fluoride solution; (3) mixing the reaction liquid A and the ammonium fluoride solution or ammonium hydrogen fluoride solution, reacting to obtain high-purity magnesium fluoride slurry, collecting the CO2 gas generated in the reaction process and returning the CO2 gas for carbonization reaction, and collecting ammonia generated in the reaction process for use; and (4) filtering the high-purity magnesium fluoride slurry, returning the filtrate for preparation of the magnesium carbonate suspension, and washing, drying and sintering the filer cake which is high-purity magnesium fluoride ointment to obtain the high-purity magnesium fluoride crystal. The production method for the high-purity magnesium fluoride crystal has good economic, social and environmental-protection benefits and is suitable for popularization and application.

Description

technical field [0001] The invention relates to the technical field of magnesium fluoride production, in particular to a production method of high-purity magnesium fluoride crystals. Background technique [0002] Magnesium fluoride is an important inorganic chemical raw material, which is widely used in the fields of hot-pressed crystal, vacuum coating and preparation of optical glass. Most of the currently produced magnesium fluoride is colloidal precipitation, which condenses into hard lumps that are difficult to use directly during the drying process, and must be crushed and sieved before use. However, fluoride is highly corrosive to most materials, so it is difficult to select materials for crushing equipment. If the materials are not selected properly, it will cause pollution to magnesium fluoride products and affect their quality. Therefore, it is imperative to directly produce powdery or crystalline magnesium fluoride. [0003] At present, the main sources of fluor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F5/28
Inventor 侯红军杨华春薛旭金于贺华张辉常运昌王建萍马小芬孙新建张凯
Owner DO FLUORIDE CHEM CO LTD
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