Abstract: Potassium feldspar from Song County，Luoyang was decomposed in rotary kiln at a low temperature.The leaching solution which was used as raw material to get potassium fluosilicate had been achieved by leaching the decomposition residue with water.The optimized conditions of reaction were as follows: reaction temperature was 60 ℃，the amount of fluorosilicic acid was 120% of the theoretical amount，the hydrogen ion concentration of leaching solution was 2.0 mol/L，and the reaction time was 10 min.Under those conditions，the recovery of potassium can be up to more than 96%，and the purity of K2SiF6 product reached 98%，reaching the standard requirements of related chemical enterprises.

Key words: potassium feldspar, extraction of potassium, fluosilicic acid, potassium fluosilicate