Abstract:With the strengthening of national environmental protection policy and people's awareness of environmental protection,copper smelting industry actively responds to and supports the ecological civilization construction of “Lucid waters and lush mountains are invaluable assets", and vigorously develops green circular economy. Theoretical and experimental studies on the recycling of gypsum,a by-product of copper smelting and acid making process, are carried out. The feasibility and advantages of replacing quick lime powder with gypsum high temperature decomposition as slag flux for flash converting furnace were studied. The solutions to the possible problems were put forward, and the implementation scheme was put forward. The application prospect was prospected.