A method for the preparation of potassium fluoride with potassium fluorosilicate

The present invention relates to a method for the preparation of potassium fluoride, potassium fluorosilicate, the method steps of: potassium silicofluoride aqueous ammonia was added to the slurry reaction mixture obtained after the slurry; mixing the slurry allowed to settle and was filtered to give the filtrate the filter cake; cake was dried silica preparation; the filtrate was cooled, crystallized, and separated by filtration and dried to obtain a mixed crystal; calcining the mixed crystal product were obtained potassium fluoride and ammonium fluoride products. In the present invention, potassium fluosilicate and ammonia as raw materials, not only the cost but also can effectively solve the exploitation of crude potassium fluosilicate and environmental problems, while the preparation of potassium fluoride and ammonium bifluoride prepared silica, high utilization of raw materials; the heating ammonium fluoride easily decomposed, and the decomposition product of ammonium bifluoride easy sublimation, and potassium fluoride, the high thermal stability characteristic, effective separation achieved using potassium, nitrogen calcination method.