Preparation method of anhydrous potassium fluoride

A technology of potassium fluoride and barium hydroxide octahydrate, applied in chemical instruments and methods, inorganic chemistry, alkali metal fluorides, etc., can solve the problems of low production efficiency and high production cost, reduce raw material costs, and improve economic benefits. Effect

Inactive Publication Date: 2018-05-15
JIANGXI QUCHENG CHEM
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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 u

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  • Preparation method of anhydrous potassium fluoride

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[0023] In order to facilitate the understanding of the present invention, the present invention will be described more fully below with reference to the associated drawings. Several embodiments of the invention are shown in the drawings. However, the present invention can be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be thorough and complete.

[0024] It should be noted that when an element is referred to as being “fixed on” another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and similar expressions are used herein for purposes of illustration only.

[0025] Unless otherwise def...

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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 ...

Claims

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Application Information

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IPC IPC(8): C01D3/02C01F11/46C01B33/12
CPCC01B33/12C01D3/02C01F11/462
Inventor 张军航
Owner JIANGXI QUCHENG CHEM
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