Method for preparing potassium fluoride
At present, domestically produced potassium fluoride is commonly used as a metal fluoride salt. It can be said that without potassium fluoride, there is no booming Chinese fluorine chemical industry. Let's take a look at the preparation method of potassium fluoride together with the potassium fluoride manufacturer.
Preparation method of potassium fluoride:
Potassium fluoride complexes the raw material with hydrogen fluoride to form a complex salt of potassium fluoride and hydrogen fluoride, and simultaneously removes hydrogen chloride released during the complexation process;
Heating, the above complex salt is completely or partially decomposed, and the decomposed hydrogen fluoride and hydrogen chloride which may remain in the system are removed to obtain potassium fluoride.
The preparation method of the potassium fluoride further comprises preparing the potassium fluoride obtained by the heat decomposition treatment into an aqueous solution, adjusting the pH value thereof to 6-8, and then crystallization by concentration or spray drying to obtain a high-activity potassium fluoride finished product. Because potassium fluoride obtained by thermal decomposition may be complexed with a small amount of hydrogen fluoride due to low decomposition temperature or insufficient decomposition time, the pH of the aqueous solution prepared by dissolving potassium fluoride obtained after thermal decomposition may be Between 1 and 12, although it can be sold as a product, it tends to be slightly insufficient in reactivity, and the market price is low. Therefore, it is necessary to adjust the pH to a suitable range, and obtain a highly active potassium fluoride by a reasonable process. .
The preparation method of potassium fluoride further includes incinerating and drying the raw materials before the complexation with the hydrogen fluoride to remove the moisture in the raw materials and the organic waste that may be contained.
