US 12,215,406 B1
Method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals
Junfeng Zhang, Yantai (CN); Lei Wang, Yantai (CN); Changqing Chu, Yantai (CN); Chenglin Li, Yantai (CN); Huinan Zhang, Yantai (CN); Minglei Shan, Yantai (CN); Junqing Zhao, Yantai (CN); Yandong Zhang, Yantai (CN); Feng Zhang, Yantai (CN); Guotao Yang, Yantai (CN); and Yuling Niu, Yantai (CN)
Assigned to SHANDONG HUMON SMELTING CO., LTD., Yantai (CN)
Filed by SHANDONG HUMON SMELTING CO., LTD., Yantai (CN)
Filed on Aug. 8, 2024, as Appl. No. 18/798,726.
Int. Cl. C22B 15/00 (2006.01); C22B 3/00 (2006.01); C22B 3/12 (2006.01); C22B 3/22 (2006.01); C22B 13/02 (2006.01); C22B 30/06 (2006.01); C22B 58/00 (2006.01)
CPC C22B 15/008 (2013.01) [C22B 3/12 (2013.01); C22B 3/22 (2013.01); C22B 13/02 (2013.01); C22B 13/04 (2013.01); C22B 15/0086 (2013.01); C22B 19/24 (2013.01); C22B 30/06 (2013.01); C22B 58/00 (2013.01)] 5 Claims
 
1. 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.