Abstract: In order to provide a basis for the development and utilization of a low-grade K-feldspar ore in Fujian,, the beneficiation tests on this ore was carried out. The results showed that with sulfuric acid as modifier, dodecylamine+diesel as collector of floating mica, hydrofluoric acid and dodecylamine as activator and collector of floating K-feldspar separately, K-feldspar concentrate with K₂O content of 9.84% and recovery of 82.82% and quartz concentrate with SiO₂ content of 98.80% and recovery of 26.07% were obtained through the flow-sheet of high intensity magnetic separation for iron removal-desliming-flotation for mica removal-flotation separation of K-feldspar and quartz. K-feldspar concentrate can meet the requirement of A-level K-feldspar raw materials for the ceramic industry, and quartz concentrates comes in line with the requirements of low-grade quartz sand for the glass industry. 

Key words: K-feldspar, High intensity magnetic separation, Desliming, Flotation