Treatment method for tin smelting acidic wastewater and intermediate slag

The invention discloses a tin smelting waste acid sewage and intermediate slag treatment method which comprises the following specific steps: (1) adding limestone into tin smelting waste acid sewage to adjust the pH value to 10-11, and carrying out solid-liquid separation to obtain first arsenic-containing gypsum slag and first filtrate; and (2) carrying out oxidation reaction on the first filtrate, adding ferric salt, carrying out stirring reaction, carrying out solid-liquid separation to obtain second arsenic-containing gypsum slag and second filtrate, and discharging or recycling the second filtrate, and (3) uniformly mixing the first arsenic-containing gypsum slag, the second arsenic-containing gypsum slag and pyrite, and feeding the mixture into a fuming furnace for treatment. The method provided by the invention not only can realize stable up-to-standard discharge or cyclic utilization of the acidic wastewater, but also can realize harmless utilization of the intermediate slag. 本发明公开了一种锡冶炼污酸污水及中间渣的处理方法，