Abstract:Analysis of nickel production technologies in China was carried out to find out problems and put forward the according improvements. Based on nickel refining technology of insoluble anode electrodeposition, sulfur was selectively precipitated with pressure leaching from atmospheric pressure leaching slag by adding calcining. The copper leaching residue was reduction smelted in electric furnace. The copper-nickel matte was paragraphing leached with recurrent liquid and anode solution from nickel electrowinning and copper electrowinning. In this way, the internal contradiction and defect in the existing process were eliminated. The new process adapts more to composition fluctuation of raw materials. The valuable metals are concentrated by stage and the recovery rates are improved.