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Method for preparing potassium fluoride with white carbon black as co-product by using fluorosilicic acid as raw material

A technology of potassium fluorosilicate and potassium fluoride, which is applied in the field of preparation of potassium fluoride and co-production of white carbon black, can solve the problems of high cost, achieve low production cost, avoid the impact of output and quality, and achieve the effect of clean production

Inactive Publication Date: 2019-11-29
内蒙古星汉新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of preparing white carbon black is to use sodium silicate, silicon tetrachloride, and ethyl orthosilicate as the silicon source. Except for sodium silicate, other costs are very high

Method used

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  • Method for preparing potassium fluoride with white carbon black as co-product by using fluorosilicic acid as raw material
  • Method for preparing potassium fluoride with white carbon black as co-product by using fluorosilicic acid as raw material

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Embodiment Construction

[0023] In the following, the technical solutions in the embodiments of the present invention are clearly and completely described. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0024] A method for preparing potassium fluoride co-production white carbon black with fluosilicic acid as raw material, the method comprises the following steps:

[0025] S1 dissolving and filtering potassium chloride to obtain a potassium chloride solution;

[0026] S2 Inject the potassium chloride solution obtained in S1 into a fluorosilicic acid solution with a mass concentration of 30% to 40% for reaction. The pH at the end of the reaction is 5 to 6. After the reaction is completed, stir for 25 to 35 minu...

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Abstract

The invention relates to a method for preparing potassium fluoride with white carbon black as co-product by using fluorosilicic acid as a raw material. The method comprises the following steps: S1 dissolving potassium chloride and filtering to obtain potassium chloride solution; S2, injecting the potassium chloride solution obtained by S1 into the fluorosilicic acid solution for reaction, and after the reaction is completed, stirring, filtering and washing to obtain the potassium fluorosilicate filter cake; S3, adding water in proportion to the potassium fluosilicate filter cake obtained in the step S2 and stirring into a paste to obtain potassium fluosilicate slurry, and then injecting potassium hydroxide solution into the slurry to carry out reaction; S4, after the reaction is completed,filtering the mixed slurry obtained in the step S3 to obtain a silica filter cake and a filtrate containing potassium fluoride. The invention uses fluorosilicic acid as a raw material to prepare potassium fluoride with white carbon black as co-product, and the by-product potassium chloride and by-product silicofluoric acid from hydrofluoric acid industry are used as main raw materials to preparehigh purity potassium fluoride with high added value white carbon black as co-product. Compared with the raw materials in the neutralization method in which potassium hydroxide and hydrofluoric acid are reacted are used for the longest time at present, the production cost of the method is low.

Description

technical field [0001] The invention belongs to the technical field of fluorine chemical industry, and in particular relates to a method for preparing potassium fluoride and co-producing white carbon black by using fluosilicic acid as a raw material. Background technique [0002] Potassium fluoride is white monoclinic crystal or crystalline powder, salty, easy to absorb moisture, soluble in water, insoluble in ethanol, its aqueous solution is alkaline, can corrode glass and porcelain, relative density is 2.454, melting point is 858°C; available Used in glass engraving, food preservation, electroplating, welding flux, insecticide, catalyst, absorbent (absorbing HF and moisture), used as analytical reagent, complex forming agent, and raw material for preparing potassium bifluoride; [0003] White carbon black is the general term for white powdery X-ray amorphous silicic acid and silicate products, mainly refers to precipitated silica, fumed silica and ultrafine silica gel, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02C01B33/12
CPCC01B33/12C01D3/02C01P2006/12C01P2006/80
Inventor 胡明辉胡作军
Owner 内蒙古星汉新材料有限公司
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