Method for reducing zinc content of purified copper slag in novel reagent purification process of zinc hydrometallurgy

The invention discloses a method for reducing zinc content in purified copper slag in a novel reagent purification process of zinc hydrometallurgy, and belongs to the technical field of zinc hydrometallurgy smelting. The method comprises the following steps: controlling factors such as primary and secondary replacement zinc powder purification tank temperature, reaction time and the like; controlling the reaction temperature of a first replacement tank, a second replacement tank and an acid dissolution tank of the cobalt removal purification of the sodium dimethyl dithiocarbamate reagent to be 88-90 DEG C, and controlling the concentration of the sodium dimethyl dithiocarbamate to be 15%; controlling the reaction temperature of the copper-cadmium slag leaching tank to be 88-90 DEG C, the reaction time is 6 h, controlling the PH value of the copper-cadmium slag leaching tank to be 3.0-3.5; controlling the reaction temperature of the copper slag pickling tank to be 80-85 DEG C, wherein the reaction time is 2.5