Abstract:The effect of fluorine on copper smelting system and the situation of sulphuric acid system in Guixi Smelter were briefly described. The practical application of fluoride removal technology in Guixi Smelter is introduced, the sodium silicate defluorination process which is used in the acid purification process has achieved a certain effect on the reduction of fluorine in the gas phase, aluminum sulfate defluorination process is used in wastewater process optimizes wastewater emission index. The relative control optimization of defluorination process is introduced.