Abstract:This paper introduces the basic principle of the flash furnace feeding system, analyses the causes of problems which occurred in flash furnace feeding system, and elaborates the corresponding technological improvement for the problems in the feeding system. Three sections of air chute and soot weightlessness system are added in the improved scheme. After the transformation, the copper content of flash furnace slag is reduced from 2.0% to 1.37%, and the incidence of SO3 is reduced from 1.84% to 0.82%, which improves the stability of the gravity loss system of flash furnace in the old smelting system, and improves the quality of matte.