Preparation method of anhydrous potassium fluoride

Abstract

The invention provides a preparation method of anhydrous potassium fluoride. The preparation method comprises the following steps: enabling a fluosilicic acid crude solution and ammonia water to reactto form a reaction solution, performing solid-liquid separation for a primary reaction solution to form solid silicon dioxide and a secondary reaction solution, enabling the secondary reaction solution to react with barium hydroxide octahydrate to form a tertiary reaction solution, enabling the tertiary reaction solution to react with potassium hydroxide, introducing high-temperature steam, heating, stirring, obtaining potassium fluoride clear solution and ammonia gas, concentrating the potassium fluoride clear solution to form potassium fluoride mother solution, introducing the potassium fluoride mother solution into a spray drying tower, spray drying the potassium fluoride mother solution to form anhydrous potassium fluoride, wherein the fluosilicic acid crude solution is a byproduct onan anhydrous hydrogen fluoride production line and comprises the ingredients such as fluosilicic acid, little sulfuric acid and little hydrofluoric acid. The fluosilicic acid crude solution is used for substituting anhydrous hydrofluoric acid, so that not only can the raw material cost be decreased, but also the comprehensive utilization of the fluosilicic acid crude solution can be realized; andmeanwhile, while the anhydrous potassium fluoride is produced, the silicon dioxide and barium sulfate can be co-produced, and the economic benefit can be improved.

Description

technical field [0001] The invention relates to the application technical field of the preparation method of anhydrous potassium fluoride, in particular to a preparation method of anhydrous potassium fluoride. Background technique [0002] Potassium fluoride is a kind of salt, also known as potassium fluoride salt, which is white monoclinic crystal or crystalline powder, salty in taste, easy to absorb moisture, soluble in water but not in ethanol. Its aqueous solution is alkaline and can corrode glass and porcelain, so it can usually be used as a variety of glass etching, welding flux, wood preservatives, agricultural pesticides, pesticide intermediates, pharmaceutical industry raw materials and organic fluorinated raw materials. Construction, chemical industry, agriculture have an indispensable role. [0003] In the prior art, in the process of producing anhydrous potassium fluoride, high-purity hydrofluoric acid is often used as a raw material, and the production cost is ...

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Problems solved by technology

[0003] In the prior art, in the process of producing anhydrous potassium fluoride, high-purity hydrofluoric acid is often used as a raw material, and the production cost is relatively high, resulting in low production efficiency of the enterprise

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