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A method for preparing potassium fluoride with potassium fluorosilicate

A technology of potassium fluorosilicate and potassium fluoride, which is applied in the field of inorganic chemical production, can solve the problems of few utilization routes of crude potassium fluorosilicate, large environmental impact, environmental pollution, etc., so as to solve the problems of development, utilization and environmental protection, and reduce impurities. , the effect of reducing production costs

Active Publication Date: 2017-03-01
KINGENTA NORSTERRA CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The by-product crude potassium fluorosilicate in the process of defluorination and purification of wet-process phosphoric acid has low purity and contains soluble phosphorus, and its direct discharge will pollute the environment
At present, the by-product crude potassium fluorosilicate in the process of defluorination and purification of wet-process phosphoric acid has few utilization methods and has a great impact on the environment.

Method used

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  • A method for preparing potassium fluoride with potassium fluorosilicate

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Effect test

Embodiment 1

[0036] A method for preparing potassium fluoride with potassium fluorosilicate, the method may further comprise the steps:

[0037] (1) The crude potassium fluorosilicate is washed with hot water (60°C) to neutrality, and prepared into a potassium fluorosilicate slurry with a concentration of 30% by mass, and 2000 kg of potassium fluorosilicate slurry is slowly added to the In an ammonia solution with a concentration of 25% by mass, the molar ratio of potassium fluorosilicate to ammonia is 1:7.0, the temperature is 60°C, and the reaction is performed for 1 hour to obtain potassium fluoride solution, ammonium fluoride solution and silicon dioxide solid. mixed slurry;

[0038](2) Let the mixed slurry settle for 2 hours, and then filter to obtain a filter cake of solid silica and a filtrate containing potassium fluoride and ammonium fluoride; The effluent is neutral, and the specific surface area is 177m3 after drying. 2 261 kilograms of finished white carbon black of / g;

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Embodiment 2

[0041] A method for preparing potassium fluoride with potassium fluorosilicate, the method may further comprise the steps:

[0042] (1) The crude potassium fluorosilicate is washed with hot water (70°C) to neutrality, and prepared into a potassium fluorosilicate slurry with a concentration of 20% by mass. Take 2000 kg of potassium fluorosilicate slurry and slowly add it to the In an ammonia solution with a concentration of 10% by mass, the molar ratio of potassium fluorosilicate to ammonia is 1:8.0, and the temperature is 70°C for 0.5 hours to obtain a mixture containing potassium fluoride solution, ammonium fluoride solution and silica solid. slurry;

[0043] (2) Settling the mixed slurry for 3 hours, filtering to obtain a filter cake of solid silica and a filtrate containing a mixed solution of potassium fluoride and ammonium fluoride; the filter cake was washed 3 times with water until it was washed out The liquid is neutral, and the specific surface area is 200m2 after dr...

Embodiment 3

[0046] A method for preparing potassium fluoride with potassium fluorosilicate, the method may further comprise the steps:

[0047] (1) The crude potassium fluorosilicate is washed with hot water (60°C) to neutrality, and prepared into a potassium fluorosilicate slurry with a concentration of 50% by mass. Take 2000 kg of potassium fluorosilicate slurry and slowly add it to the In an ammonia solution with a concentration of 20% by mass, the molar ratio of potassium fluorosilicate to ammonia is 1:9.0, and the temperature is 65°C for 2 hours to obtain a mixture containing potassium fluoride solution, ammonium fluoride solution and silica solid. slurry;

[0048] (2) Settling the mixed slurry for 4 hours, filtering to obtain a filter cake of solid silica and a filtrate containing a mixed solution of potassium fluoride and ammonium fluoride; the filter cake was washed 4 times with water until it was washed out The liquid is neutral, and the specific surface area after drying is 131...

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Abstract

The invention relates to a method for preparing potassium fluoride by utilizing potassium fluosilicate. The method comprises the following steps: adding a potassium fluosilicate slurry into ammonia water and reacting to obtain a mixing slurry; standing, subsiding and filtering the mixing slurry to obtain a filtrate and a filter cake; drying the filter cake and preparing white carbon black; cooling, crystallizing, filtering, separating and drying the filtrate to obtain a mixing crystal; calcining the mixing crystal, thereby respectively obtaining a potassium fluoride product and an ammonium hydrogen fluoride product. According to the method, the potassium aluminosilicate and the ammonia water are used as raw materials, so that the cost is low; and the problems of the development utilization and the environmental friendliness of crude potassium fluosilicate are solved effectively. When the potassium fluoride is prepared, the white carbon black and the ammonium hydrogen fluoride are prepared at the same time, so that the utilization rate of the raw materials is high. Based on the characteristics that the ammonium fluoride is easily decomposed when being heated, the ammonium hydrogen fluoride as a decomposition product is easily sublimated and the heat stability of the potassium fluoride is high, the potassium element and the nitrogen element are separated effectively by utilizing a calcination method.

Description

technical field [0001] The invention relates to a method for preparing potassium fluoride with potassium fluorosilicate, in particular to a method for producing potassium fluoride by using crude potassium fluorosilicate, a by-product of defluorination and purification of wet-process phosphoric acid, as a raw material and co-producing white carbon black and hydrogen fluoride The ammonium method belongs to the technical field of inorganic chemical production. Background technique [0002] Potassium fluoride is an important inorganic compound, which is widely used in glass engraving, food antiseptic, electroplating and preparation of potassium hydrogen fluoride, etc.; in the field of welding, it is mainly used as a flux for various alloys or metal welding, and in the field of organic compound generation. As a fluorinating agent, it can also be used as an absorbent for absorbing hydrogen fluoride and water. In the field of pesticides, it is used to produce sodium fluoroacetate a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D3/02
Inventor 高建仁胡兆平邢士玉徐文凤李秀芹胡善明
Owner KINGENTA NORSTERRA CHEM CO LTD
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