Method for preparing potassium fluoride by using potassium alkali and potassium fluosilicate

Abstract

The invention discloses a process method for preparing white carbon black and potassium fluoride by replacing potassium fluosilicate with potassium alkali. Potassium fluosilicate reacts with strong potassium hydroxide to obtain white carbon black, after mother liquor is concentrated and cleaned, solid and liquid are separated, potassium fluoride is obtained, the mother liquor returns to a potassium fluosilicate reaction tank to participate in the reaction, potassium fluoride is subjected to spray drying at 550 DEG C, anhydrous potassium fluoride with the mass fraction larger than 98.5% is obtained, and waste heat is used for concentration and crystallization.

Description

technical field

[0001] The invention relates to a method for preparing potassium fluoride by using potassium alkali and potassium fluorosilicate, and belongs to the field of chemical, chemical and fine chemicals. Background technique

[0002] Fluosilicic acid is a low-value by-product in the production process of wet phosphate fertilizer. It has few uses and will have a serious impact on environmental protection. The development and utilization of fluosilicic acid urgently needs to be solved. Silica and ammonium fluoride are produced by ammoniation of fluorosilicate. As a reinforcing material with superior performance, silica has a broad market and good development prospects in the processing and application of polymer materials; ammonium fluoride It can be used as a raw material to produce anhydrous hydrofluoric acid, and many fluorides can be derived. This route is a more effective way for the comprehensive utilization of fluosilicic acid. The production of white carbon b...

Examples

Embodiment 1

[0022] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 550 degrees Celsius to obtain 98.5% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

Embodiment 2

[0024] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 600 degrees Celsius to obtain 98.7% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

Embodiment 3

[0026] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 500 degrees Celsius to obtain 98.6% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

technical field

[0001] The invention relates to a method for preparing potassium fluoride by using potassium alkali and potassium fluorosilicate, and belongs to the field of chemical, chemical and fine chemicals. Background technique

[0002] Fluosilicic acid is a low-value by-product in the production process of wet phosphate fertilizer. It has few uses and will have a serious impact on environmental protection. The development and utilization of fluosilicic acid urgently needs to be solved. Silica and ammonium fluoride are produced by ammoniation of fluorosilicate. As a reinforcing material with superior performance, silica has a broad market and good development prospects in the processing and application of polymer materials; ammonium fluoride It can be used as a raw material to produce anhydrous hydrofluoric acid, and many fluorides can be derived. This route is a more effective way for the comprehensive utilization of fluosilicic acid. The production of white carbon b...

Examples

Embodiment 1

[0022] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 550 degrees Celsius to obtain 98.5% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

Embodiment 2

[0024] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 600 degrees Celsius to obtain 98.7% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

Embodiment 3

[0026] 200kg of 48% potash and 150kg of potassium fluorosilicate are mixed in the reaction tank. After the complete reaction and precipitation, the silicon dioxide is filtered with a plate filter, the mother liquor is concentrated and crystallized, and the solid is separated by a plate filter. The solid is potassium fluoride. The mother liquor returns to the reaction tank and fluorine participates in the reaction. The solid potassium fluoride was dried by spray drying at 500 degrees Celsius to obtain 98.6% anhydrous potassium fluoride. The waste heat tail gas is returned to concentrate and crystallize the mother liquor.

Images