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Method for preparing potassium fluoride based on hydrogen fluoride workshop tail gas absorption liquid

A workshop tail gas and tail gas absorption technology, applied in the direction of alkali metal fluoride, etc., can solve the problem of low market value of fluosilicic acid, achieve the effect of increasing profit value, reducing reaction unit, and improving reaction efficiency

Pending Publication Date: 2022-01-14
CHIZHOU TINCI HIGH TECH MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the treatment method of tail gas absorption liquid is: directly sell fluosilicic acid at a low price, but the market value of fluosilicic acid is low, and it cannot bring higher value benefits to the enterprise

Method used

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  • Method for preparing potassium fluoride based on hydrogen fluoride workshop tail gas absorption liquid
  • Method for preparing potassium fluoride based on hydrogen fluoride workshop tail gas absorption liquid
  • Method for preparing potassium fluoride based on hydrogen fluoride workshop tail gas absorption liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In this example, the "one-pot method" was used to react the hydrogen fluoride plant tail gas absorption liquid containing hydrogen fluoride and fluosilicic acid with potassium hydroxide, heat up to 90°C for hydrolysis, filter and separate silica, and dry the filtrate to obtain potassium fluoride. The principle is:

[0027] HF+KOH=KF+H2O

[0028] H2SiF6+2KOH=K2SiF6+2H2O

[0029] K2SiF6+4KOH=6KF+SiO2+2H2O

[0030] In the hydrogen fluoride plant tail gas absorption liquid corresponding to this embodiment, the hydrogen fluoride content is 20%, the fluosilicic acid content is 30%, and the potassium hydroxide participating in the reaction is 85% analytically pure.

[0031] The specific small test operation is:

[0032] Configure 1000ml of 55% potassium hydroxide solution, weigh 15.72g of 55% KOH solution in a 1000ml polytetrafluoroethylene reaction bottle, turn on magnetic stirring, add 6.8g of tail gas absorbing solution dropwise under stirring conditions, within the set ...

Embodiment 2

[0043] In order to apply the above small test results to actual production, this embodiment provides a reaction tank for preparing potassium fluoride based on the exhaust gas absorption liquid of the hydrogen fluoride workshop.

[0044] Such as figure 1 As shown, it is a schematic diagram of the overall structure of the reaction tank, including a tank body 100, the top of the tank body 100 has a liquid inlet 110, and the liquid inlet 110 is used to deliver exhaust gas absorption liquid to the inside of the tank body 100, and the bottom of the tank body 100 has Liquid return port 120. The liquid return port 120 is used to recover the tail gas absorption liquid at the bottom of the tank body 100 that has not participated in the reaction and pump it into the liquid inlet port 110 again through the circulation pump to participate in the reaction.

[0045] see figure 2 , the top of the tank body 100 is provided with a liquid distributor 210 communicating with the liquid inlet 110...

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Abstract

The invention discloses a method for preparing potassium fluoride based on hydrogen fluoride workshop tail gas absorption liquid, which comprises the following steps of: quantitatively introducing tail gas absorption liquid into a potassium hydroxide solution, heating to react for more than 1 hour, cooling, separating out silicon dioxide, and drying filtrate to obtain potassium fluoride. According to the method, the reaction temperature is controlled to be 90 DEG C, the reaction time is controlled to be 2 h, the fluorine / potassium molar ratio is controlled to be 1: 1 to 1: 1.01, potassium fluoride with the purity reaching 99.6% can be prepared through the hydrogen fluoride workshop tail gas absorption liquid, the reaction conversion rate in the preparation process nearly reaches 100%, and therefore the profit value of a hydrogen fluoride production line is increased; and secondly, a reaction tank correspondingly arranged aiming at the method can reduce the reaction unit and realize synchronous reaction control, so that the reaction efficiency is favorably improved.

Description

technical field [0001] The invention belongs to the technical field of tail gas treatment, in particular to a method for preparing potassium fluoride based on a hydrogen fluoride workshop tail gas absorption liquid. Background technique [0002] The exhaust gas absorption liquid of the hydrogen fluoride workshop mainly contains hydrogen fluoride and fluosilicic acid. At present, the treatment method of tail gas absorbing liquid is: direct sale of fluosilicic acid at a low price, but the market value of fluosilicic acid is low, and it cannot bring higher value benefits to the enterprise. In order to increase the profit value of the hydrogen fluoride plant tail gas absorption liquid treatment, the company improved the existing hydrogen fluoride plant tail gas absorption liquid treatment process, and proposed a method for preparing potassium fluoride based on the hydrogen fluoride plant tail gas absorption liquid. The fluorine content in the tail gas absorption liquid is relati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/02
CPCC01D3/02
Inventor 郭冬冬王龙安星辰高飞
Owner CHIZHOU TINCI HIGH TECH MATERIALS CO LTD