Method for recovering bismuth from secondary zinc oxide slag

The invention relates to a method for receiving zinc and indium, and further recovering bismuth from secondary zinc oxide slag. Under sulfuric acid leaching condition, the lead skim are filtered and recovered after sedimentation; bismuth, indium and zinc are dissolved in the solution, and then oxalate, sodium phosphate and caustic soda in certain quantity are added to the solution to further purify bismuth, indium and zinc while controlling the pH value within certain range, the filter residue after separation is added with hydrochloric acid for redissolving to have replacement reaction by an iron plate, so as to dissolve out bismuth and indium spongy simple substance, the sediment is performed with secondary acid solution, filtering and scrubbing to obtain bismuth, the bismuth is added to concentrated nitric acid for reaction, and then the bismuth subnitrate end product after crystallization and drying.