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Method for preparing thermocompressed polycrystalline magnesium fluoride powder

A crystalline magnesium fluoride and powder technology, which is applied in the field of hot-pressed polycrystalline magnesium fluoride powder preparation, can solve the problems of very high quality requirements of basic magnesium carbonate, environmental pollution, mother liquor not being closed-circuited, etc. Significant environmental benefits, significant economic benefits, and low prices

Active Publication Date: 2010-06-09
BAIYIN ZHONGTIAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method has very high requirements on the quality of basic magnesium carbonate, and the aqueous solution of hydrofluoric acid is used for synthesis, which is very easy to introduce new impurities. After the synthesis of magnesium fluoride, the excess hydrofluoric acid needs to be neutralized with ammonia, and the mother liquor is not processed. Closed loop, serious environmental pollution

Method used

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  • Method for preparing thermocompressed polycrystalline magnesium fluoride powder

Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of hot-pressed polycrystalline magnesium fluoride powder comprises the following steps:

[0017] (1) Purify raw materials

[0018] Weigh 150g of industrial grade MgSO 4 ·7H 2 O is mixed with the magnesium sulfate solution that mass percent concentration is 35%, adjusts the pH value to 9, then adds 10g weight percent concentration and is 40% hydrogen peroxide, stirs 0.5 hour, obtains the purified magnesium sulfate solution through filtration; Take 64g industrial Grade sodium carbonate is mixed with the sodium carbonate solution that mass percent concentration is 10%, adds the magnesium sulfate solution of 15g purification wherein, stirs 2 hours, goes out heavy metal impurity wherein by reaction co-precipitation, obtains the sodium carbonate solution of purification through filtration;

[0019] (2) prepare basic magnesium carbonate

[0020] Heat the purified magnesium sulfate solution and the purified sodium carbonate solution to 50°C respectivel...

Embodiment 2

[0024] The preparation method of hot-pressed polycrystalline magnesium fluoride powder comprises the following steps:

[0025] (1) Purify raw materials

[0026] Weigh 200g of industrial grade MgSO 4 ·7H 2 O is mixed with the magnesium sulfate solution that mass percent concentration is 10%, adjusts pH value to 8, then adds 20g weight percent concentration and is 55% hydrogen peroxide, stirs 1 hour, obtains purified magnesium sulfate solution through filtration; Weigh 85g industrial Grade sodium carbonate is mixed with the sodium carbonate solution that mass percent concentration is 30%, adds the magnesium sulfate solution of 6g purification wherein, stirs 1 hour, goes out heavy metal impurity wherein by reaction coprecipitation, obtains the sodium carbonate solution of purification through filtration;

[0027] (2) prepare basic magnesium carbonate

[0028] Heat the purified magnesium sulfate solution and the purified sodium carbonate solution to 70°C respectively, then slow...

Embodiment 3

[0032] The preparation method of hot-pressed polycrystalline magnesium fluoride powder comprises the following steps:

[0033] (1) Purify raw materials

[0034] Weigh 246g of industrial grade MgSO 4 ·7H 2 O is mixed with the magnesium sulfate solution that weight percent concentration is 20%, adjusts the pH value to 8, then adds 60g weight percent concentration and is 30% hydrogen peroxide, stirs 1 hour, obtains purified magnesium sulfate solution through filtration; Weigh 100g industrial Grade sodium carbonate is mixed with the sodium carbonate solution that weight percent concentration is 5%, adds the magnesium sulfate solution of 20g purification wherein, stirs 2 hours, goes out wherein heavy metal impurity by reaction coprecipitation, obtains the sodium carbonate solution of purification through filtration;

[0035] (2) prepare basic magnesium carbonate

[0036] Heat the purified magnesium sulfate solution and the purified sodium carbonate solution to 30°C respectively,...

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Abstract

The invention discloses a method for preparing thermocompressed polycrystalline magnesium fluoride powder. The method comprises the steps of: taking industrial grade magnesium sulfate and industrial grade sodium carbonate as initial raw materials, preparing basic magnesium carbonate by purifying the raw materials, carbonating the basic magnesium carbonate, and finally, performing a reaction of the carbonated basic magnesium carbonate and anhydrous hydrofluoric acid to obtain the thermocompressed polycrystalline magnesium fluoride powder. The method takes the industrial grade magnesium sulfate and the industrial grade sodium carbonate as the raw materials to synthesize the basic magnesium carbonate, and has the advantages of cheap raw materials, low production cost, and remarkable economic benefit; the magnesium fluoride powder prepared by the reaction of the basic magnesium carbonate and the anhydrous hydrofluoric acid has high purity and uniform particle size; the utilization rate of fluorine and magnesium are high and can reach over 98 percent; the method has no discharge of three wastes during preparation, makes all mother solutions entirely in closed circulation, and has remarkable environmental protection benefit; the method has the advantages of less investment, simple equipment, and easy operation; and an infrared optical element obtained by thermocompressing the magnesium fluoride powder prepared by the preparation method has high transmittance on infrared bands, and particularly the transmittance on infrared bands with wavelengths of between 1 and 7mu m reaches 95 percent.

Description

technical field [0001] The invention belongs to the field of inorganic fine chemicals, and in particular relates to a preparation method of hot-pressed polycrystalline magnesium fluoride powder. Background technique [0002] Hot-pressed polycrystalline magnesium fluoride is processed by high-purity magnesium fluoride powder with uniform particle distribution and appropriate particle size through high-temperature and high-pressure processing. It has good polarization and infrared transmission properties, and is a good infrared optical material. , especially in the 1-7μm infrared band, the transmittance is over 90%. It has many characteristics such as high mechanical strength, strong thermal shock resistance, chemical corrosion resistance and isotropy, and can be widely used in infrared fairings, infrared windows of precision guided missiles, and civilian infrared detectors. Due to its special properties and performance, magnesium fluoride powder has strict requirements on tr...

Claims

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Application Information

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IPC IPC(8): C01F5/28
Inventor 李凌云李云峰罗成果刘海霞李洁孙永明薛峰峰吴海峰
Owner BAIYIN ZHONGTIAN CHEM
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