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Method for producing potassium fluoride

A production method, potassium fluoride technology, applied in the direction of alkali metal fluoride, etc., can solve the problem of high cost

Inactive Publication Date: 2008-03-05
DO FLUORIDE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its traditional production method is to make hydrofluoric acid as raw material and react with potassium hydroxide, and hydrofluoric acid is used as raw material, and the cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The method for producing Potassium Fluoride of the present invention, is raw material with fluosilicic acid and Potassium Chloride, comprises the following steps:

[0019] (1) React 15% fluosilicic acid solution with potassium chloride solid for 30 minutes, filter to obtain potassium fluosilicate solid, and the liquid is waste hydrochloric acid; (2) put potassium fluosilicate at a temperature of 350°C, Decompose for 4 hours to generate potassium fluoride solid product and silicon tetrafluoride gas; (3) absorb and hydrolyze the obtained silicon tetrafluoride gas with water, filter to obtain a concentration of 15% fluosilicic acid solution and return to make fluosilicic acid Potassium, the resulting silica solids were washed and dried to obtain white carbon black.

Embodiment 2

[0021] The method for producing Potassium Fluoride of the present invention, is raw material with fluosilicic acid and Potassium Chloride, comprises the following steps:

[0022] (1) react 25% fluorosilicic acid solution with 30% potassium chloride solution for 30 minutes, filter to obtain potassium fluorosilicate solid, and the liquid is waste hydrochloric acid; (2) prepare the fluorosilicic acid Potassium decomposes at a temperature of 450° C. for 3 hours to generate potassium fluoride solid product and silicon tetrafluoride gas; (3) absorb and hydrolyze silicon tetrafluoride gas with water, and return the obtained 25% fluosilicic acid solution by filtration Potassium fluorosilicate is removed, the silica solid is washed and dried to obtain white carbon black.

Embodiment 3

[0024] The method for producing Potassium Fluoride of the present invention, is raw material with fluosilicic acid and Potassium Chloride, comprises the following steps:

[0025] (1) react 35% fluosilicic acid solution with 20% potassium chloride solution for 30 minutes, filter to obtain potassium fluosilicate solid, and the liquid is waste hydrochloric acid; (2) put potassium fluosilicate at 750°C Decompose for 2 hours to generate potassium fluoride solid product and silicon tetrafluoride gas; (3) absorb silicon tetrafluoride gas with water and hydrolyze, filter to obtain 35% fluosilicic acid solution and return to make potassium fluosilicate, silicon dioxide The solid was washed and dried to obtain white carbon black.

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PUM

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Abstract

The present invention relates to process of producing potassium fluoride with fluorosilicic acid and potassium chloride as material. The process includes the following steps: 1. reacting fluorosilicic acid solution and potassium chloride for 10-60 min, filtering to obtain solid potassium fluorosilicate and waste hydrochloric acid solution; 2. decomposing potassium fluorosilicate at 300-800 deg.c for 1-5 hr to produce solid potassium fluoride product and silicon tetrafluoride gas; and 3. absorbing silicon tetrafluoride gas with water and hydrolyzing, filtering to obtain fluorosilicic acid solution to be returned to the step 1 and solid silica, and washing and drying silica to obtain carbon white. The process utilizes fluorosilicic acid as one side product of phosphate fertilizer production as one main material, and has low cost and environment friendship.

Description

technical field [0001] The invention relates to a production method of potassium fluoride, in particular to a method for producing potassium fluoride by using fluosilicic acid and potassium chloride as raw materials. Background technique [0002] Potassium fluoride is mainly used as a flux in various alloys and metal welding groups; it is widely used as a fluorinating agent in the formation of organic compounds; it is used in the production of sodium fluoroacetate and fluoroacetamide pesticides in pesticides; it is used in medicine to make fluorine Pacic acid; in addition, it can be used as an absorbent (absorbing HF and moisture), as well as a raw material for making potassium bifluoride, and can also be used for glass carving and food preservation. Its traditional production method is that hydrofluoric acid is used as raw material to react with potassium hydroxide, and hydrofluoric acid is used as raw material, and the cost is relatively high. Contents of the invention ...

Claims

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Application Information

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IPC IPC(8): C01D3/02
Inventor 李世江侯红军杨华春皇甫根利刘海霞张良张金保
Owner DO FLUORIDE CHEM CO LTD
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