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Preparation method of potassium fluoride

A technology of potassium fluoride and fluorosilicic acid, applied in directions such as alkali metal fluorides, can solve problems such as high production cost, reduce raw material cost and processing cost, and be beneficial to large-scale production and application.

Inactive Publication Date: 2018-05-01
JIANGXI QUCHENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Based on this, the purpose of the present invention is to solve the problem that in the prior art, when preparing potassium fluoride, anhydrous hydrogen fluoride is usually selected as the production raw material and the production cost is very high.

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  • Preparation method of potassium fluoride
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  • Preparation method of potassium fluoride

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preparation example Construction

[0028] In order to solve this problem, the present invention proposes a kind of preparation method of Potassium Fluoride, wherein, the step of this preparation method is as follows:

[0029] (1) First, add a fluorosilicic acid solution with a mass fraction of 20% to 36% in a reaction kettle, start the mixer and stir evenly, then add potassium fluorosilicate solution into the reaction kettle, and continue stirring until the reaction kettle The solution in is homogeneous. Wherein, the equivalent ratio of the added potassium fluorosilicate solution to the fluorosilicate solution ranges from 1:5 to 3:5.

[0030] After adding the above-mentioned potassium fluorosilicate solution, a potassium hydroxide solution with a mass fraction of 48% was added into the reaction kettle at a uniform speed. Wherein, the equivalent ratio of the added potassium hydroxide solution to the added fluosilicic acid solution ranges from 1:1 to 21:1. The main purpose of adding potassium hydroxide solution...

Embodiment 1

[0050] 1. Add 35% fluorosilicic acid (wherein the fluorosilicic acid is a by-product of the anhydrous hydrogen fluoride production line) into the reactor, and then start the mixer for stirring. After stirring evenly, continue to add potassium fluorosilicate into the reaction kettle, and continue stirring until the mixed solution in the reaction kettle is uniform. In this embodiment, the equivalent ratio between potassium fluorosilicate and fluorosilicic acid is 5:1.

[0051] 2. Add potassium hydroxide solution with a mass fraction of 48% into the above-mentioned reaction kettle at a uniform speed, and continue stirring until the reaction is complete, and the pH value at the end of the reaction is 7.5-8. After the reaction in the reaction kettle is complete, the reaction liquid in the reaction kettle is subjected to solid-liquid separation, wherein the obtained solid is subjected to beating and cleaning treatment to obtain high-purity silica, and the high-purity silica can be o...

Embodiment 2

[0056] 1. Add fluorosilicic acid with a mass fraction of 20% (wherein the fluorosilicic acid is a by-product on the anhydrous hydrogen fluoride production line) into the reaction kettle, and then start the mixer for stirring operation. After stirring evenly, continue to add potassium fluorosilicate with a mass fraction of 48% into the reactor, and continue stirring until the mixed solution in the reactor is uniform. In this embodiment, the equivalent ratio between potassium fluorosilicate and fluorosilicic acid is 3:1.

[0057] 2. Add potassium hydroxide solution with a mass fraction of 48% into the above-mentioned reaction kettle at a uniform speed, and continue to stir until the reaction is complete, and the pH value at the end of the reaction is 8 to 8.5. After the reaction in the reaction kettle is complete, the reaction liquid in the reaction kettle is subjected to solid-liquid separation, wherein the obtained solid is subjected to beating and cleaning treatment to obtain...

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Abstract

The invention relates to a preparation method of potassium fluoride. The method comprises: adding fluorosilicic acid and potassium fluosilicate into a reaction kettle, after starting to stir, continuously adding potassium hydroxide solution, and regulating a pH (power of hydrogen) value of mixed solution in the reaction kettle into a first preset pH value; after completing the reaction, carrying out solid-liquid separation, adding a first supernatant obtained by solid-liquid separation into a refining kettle, then adding sulfuric acid solution into the refining kettle and carrying out stirring; after continuously adding barium hydroxide octahydrate into the refining kettle and carrying out stirring, transferring liquid obtained by solid-liquid separation into a transfer groove, adding potassium carbonate to carry out stirring, and after completing the reaction, transferring second supernatant into a concentration kettle; after regulating a pH value of mother solution of the potassium fluoride in the concentration kettle by utilizing hydrofluoric acid, carrying out spray-drying on the mother solution of the potassium fluoride to obtain anhydrous potassium fluoride. According to thepreparation method of the potassium fluoride, which is disclosed by the invention, raw material cost and machining cost can be reduced; the preparation method of the potassium fluoride is beneficial to large-scale production application.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a preparation method of potassium fluoride. Background technique [0002] In the field of chemicals, salt is a very common chemical. Salts play a very important role in both industrial production and scientific inquiry in the laboratory. As one of the more common salts, potassium salt plays an important role in actual industrial production and scientific research. [0003] Among them, potassium fluoride is a relatively common potassium salt, which can also be called potassium fluoride salt. Its corresponding chemical formula is KF and its molecular weight is 58.10. It is white monoclinic crystal or crystalline powder under normal conditions, tastes salty, and is easy to absorb moisture. Meanwhile, potassium fluoride is extremely soluble in water and insoluble in ethanol. Its aqueous solution is alkaline and can corrode glass and porcelain, with a relative density...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02
CPCC01D3/02C01P2006/12C01P2006/80C01P2006/82
Inventor 张军航
Owner JIANGXI QUCHENG CHEM
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