A kind of coarse grain strontium fluoride and its preparation method

A technology of coarse-grained, strontium fluoride, applied in the direction of calcium/strontium/barium fluoride, calcium/strontium/barium halide, etc., can solve the problem of fine particles, etc. Efficient effect

Active Publication Date: 2017-01-25
SICHUAN HUANAN INORGANIC SALTS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this particle size is still considered too fine in use, so new synthesis conditions are needed to generate larger strontium fluoride crystals

Method used

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  • A kind of coarse grain strontium fluoride and its preparation method
  • A kind of coarse grain strontium fluoride and its preparation method
  • A kind of coarse grain strontium fluoride and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: Add 21 liters of 10% strontium chloride solution in the synthesis reactor with stirring. 1.6 kg of 40% hydrofluoric acid solution was gradually added under stirring, and the addition was completed within 2 hours. After the feeding is completed, stop stirring, insert the air guide tube, and pass through the air guide tube into ammonia gas diluted 12 times with air. Pass ammonia until the pH value of the feed liquid reaches 7.8. The whole ventilation time is 4h. The consumption of ammonia is 0.8 kilogram. After the ammonia passing is completed, the material is moved to the suction filter tank for suction filtration, and washed with pure water until the chlorine radicals meet the requirements. Take out the wet product of strontium fluoride and dry it at 110~120℃ for 3h. Then heat up to 180-190°C and dry for 1 hour to obtain 1.85 kg of finished product. Content 99.9%.

[0027] The above products were tested figure 2 ,Compared figure 2 and figure 1 I...

Embodiment 2

[0028] Embodiment 2: Add 21 liters of 10% strontium chloride solution in a synthetic reactor with stirring. 2.0 kg of 32% hydrofluoric acid solution was gradually added under stirring, and the addition was completed within 3 hours. After the feeding was completed, the stirring was stopped, an air guide tube was inserted, and ammonia gas diluted 8 times with air was introduced through the air guide tube. Pass ammonia until the pH value of the feed liquid reaches 7.6. The whole ventilation time is 3h. The consumption of ammonia is 0.86 kilograms. After the ammonia passing is completed, the material is moved to the suction filter tank for suction filtration, and washed with pure water until the chlorine radicals meet the requirements. Take out the wet product of strontium fluoride and dry it at 120~130℃ for 2.5h. Then heat up to 190-200°C and dry for 1 hour to obtain 1.80 kg of finished product. The content is 99.8%.

[0029] The above products were tested image 3 ,Compar...

Embodiment 3

[0030] Embodiment 3: Add 30 liters of 8% strontium chloride solution in the reaction synthesizer with stirring, gradually add 45% hydrofluoric acid solution under stirring, strontium in the strontium chloride solution and hydrofluoric acid in the hydrofluoric acid solution The ratio of the amount of acid to substance is 1:2.2-2.5, and the hydrofluoric acid solution is added in 1.5 hours. After the addition is completed, the diluted ammonia gas with a concentration of 20% ammonia is introduced until the pH is 8.0, and the aeration time is 2 hours. After the ammonia passing is completed, the material is transplanted into the suction filter tank for suction filtration and washed with pure water, and the wet product of strontium fluoride is taken out and dried at 130-140°C for 2 hours, and then heated to 200-220°C for 0.75 hours to obtain the product , The particle size inspection of the product shows that more than 70% of the products have a particle size between 50 and 150 μm.

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Abstract

The invention relates to the field of chemical industry, particularly a coarse grain strontium fluoride and a preparation method therefor. The preparation method comprises the steps of: performing a reaction on a strontium chloride solution and a hydrofluoric acid solution to obtain strontium fluoride; then using ammonia gas as a precipitator to slowly precipitate the strontium fluoride; utilizing a property that strontium fluoride dissolves in hydrochloric acid in an initial stage of synthesizing strontium fluoride, dissolving the strontium fluoride in hydrochloric acid rather than arising precipitation immediately; and then stepwise neutralizing acid therein by diluted ammonia to precipitate strontium fluoride stepwise and uniformly, thus growing the grains to obtain a large-grain crystal product, and the grain size of over 70% of prepared strontium fluoride particles can reach 50-150[mu]m,. The preparation method is simple, easy to operate, short in production period and high in production efficiency.

Description

technical field [0001] The invention relates to the field of chemical industry, in particular to a coarse-grain strontium fluoride and a preparation method thereof. Background technique [0002] Strontium fluoride, molecular formula: SrF 2 , Density 4.24g / cm 3 , Melting point 1473°C, boiling point 2489°C. Soluble in hot hydrochloric acid, slightly soluble in water, insoluble in hydrofluoric acid solution and alcohol. It is mainly used in the manufacture of optical glass, advanced electronic components, etc. It is also used in pharmaceuticals and other fluoride substitutes. It is an important raw material for manufacturing high-quality optical glass and laser single crystal. Because it is often necessary to feed materials at high temperature during use, serious dust will be generated, causing large material losses and serious environmental pollution. Therefore, users often ask for coarse particle products with a particle size of 50 μm or more. [0003] Most of the exist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/22
CPCC01F11/22C01P2004/51C01P2004/60C01P2004/61C01P2004/62C01P2006/80
Inventor 沈连芳李永富
Owner SICHUAN HUANAN INORGANIC SALTS CO LTD
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