Method for recovering thallium metal in lead-zinc smelting waste acid wastewater

The invention relates to the technical field of lead and zinc smelting, and aims to provide a method for recovering thallium metal in lead and zinc smelting waste acid wastewater, which comprises the following steps: adjusting waste acid wastewater, adding lime milk and a biological agent for reaction, treating to obtain zinc slag, performing secondary thickening and vulcanization reaction on supernate to obtain underflow and supernate, and recycling thallium metal from the underflow and the supernate. Filtering the supernatant to obtain thallium sulfide slag, and returning the filtrate to an ore dressing system for reuse; concentrating the underflow generated by the primary thickening and the secondary thickening to obtain supernate, returning the supernate to the regulating tank for reuse, carrying out filter pressing on the underflow to obtain sludge, and returning the filtrate to the concentration tank; according to the method, the technological process is practical and reliable, operation is easy and saf