公开(公告)号：US20240191323A1

公开(公告)日：2024-06-13

申请号：US18210646

申请日：2023-06-15

申请人： Nanjing University

发明人： Zhan QU ,  Xianze WANG ,  Hongqiang REN ,  Jinfeng WANG ,  Junzhen LIU ,  Yusen CHEN

IPC分类号： C22B11/00 ,  B22F9/04 ,  B22F9/24 ,  C01G3/02 ,  C22B1/00 ,  C22B3/22 ,  C22B3/44 ,  C22B7/00

CPC分类号： C22B11/046 ,  B22F9/04 ,  B22F9/24 ,  C01G3/02 ,  C22B1/005 ,  C22B3/22 ,  C22B3/44 ,  C22B7/007 ,  B22F2301/255

摘要： A method for recycling silver from a waste IC chip include: heating to disassemble an IC chip, and crushing the IC chip into powders; adding the powders to a nitric acid solution, heating, centrifuging and collecting a first filtrate; adding soluble starch to the first filtrate, where a mass concentration ratio of the soluble starch to Fe in the first filtrate is 5.20-7.30; heating a resulting mixture to 130-175° C. for a first hydrothermal reaction, separating a precipitate from the first hydrothermal reaction and collecting a second filtrate; heating the second filtrate to 160-230° C. for a second hydrothermal reaction, separating a solid from the second hydrothermal reaction and collecting a third filtrate; drying, grinding, and sieving the solid to obtain silver powders; and adding alkali to the third filtrate to form a precipitate of Cu, and separating the precipitate to yield copper hydroxide.