Method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals

A method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals, wherein the method comprises the following steps:

• performing pretreatment and subjecting oxidative acid leaching;
• specifically, washing the pretreated leaching residue with water and subsequently sending it for oxidative acid leaching;
• and the oxidative acid leaching adopts a two-stage countercurrent method, and the operation steps are as follows:
• A1 first-stage leaching:
• continuously introducing air during the leaching process, adding water and stirring, maintaining a liquid-to-solid ratio (3-4):
• 1 and a temperature of 70-80° C., adding 60-70 g/L sulfuric acid, and reacting for 2-4 h;
• subsequently extracting In from the leachate using tributyl phosphate;
• then extracting Cu from the raffinate;
• and finally preparing basic zinc carbonate from the raffinate;
• and
• A2 second-stage leaching:
• continuously introducing air during the leaching process, adding water and stirring, maintaining a liquid-to-solid ratio of (3-4):
• 1 and a temperature of 70-80° C., adding 120-130 g/L sulfuric acid, 10-15 g/L sodium chloride, and 0.02-0.3 g/L metal leaching synergist, reacting for 2-4 h, returning the second-stage leachate to the first-stage leaching process, and recycling for reuse;
• subsequently, neutralizing and hydrolyzing the leachate to separate Bi;
• finally reducing and smelting the leaching residue to recover Pb;
• the preparation method of the metal leaching synergist is as follows:
• according to parts by weight, stirring 5-10 parts of 1,3,5-triazine-2,4,6 (1H,3H,5H)-trithione, trisodium salt, 0.07-0.2 part of 5,10,15,20-tetrakis(4-vinylphenyl) porphyrin, 0.6-2.5 parts of acrylo polysilsesquioxane cage mixture, 120-160 parts of toluene, and 0.5-2.5 parts of photoinitiator, reacting for 50-100 minutes under the irradiation of 365 nm ultraviolet light, and then removing the toluene via reduced pressure distillation after the reaction is finished, to obtain the metal leaching synergist.