公开(公告)号：US11566333B2

公开(公告)日：2023-01-31

申请号：US16647530

申请日：2018-07-13

Applicant: INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES

Inventor： Hui Zhang ,  Xulong Dong ,  Tao Qi

IPC: H01M10/38 ,  C25C1/20 ,  C22B3/04 ,  C22B3/06 ,  C25C7/02 ,  C25C7/04

Abstract: A method for cleanly extracting metallic silver includes: mixing an acidic solution containing Ce4+ and NO3− with a silver-containing material for leaching; after the leaching is completed, carrying out a solid-liquid separation to obtain a leaching solution containing Ce3+ and Ag+; and electrolyzing the leaching solution, wherein an oxidation reaction of Ce3+ occurs at an anode to realize a regeneration of Ce4+ and an electrolytic reduction occurs at a cathode to reduce Ag+ to obtain the metallic silver. Ce4+ is used as a leaching agent and an intermediate oxidant to implement a cyclic operation of solution leaching and electrolytic regeneration on the silver-containing material. Almost no NOx and waste liquid are caused by the extraction process, and the invention is clean and environmentally friendly.

公开(公告)号：US11384443B2

公开(公告)日：2022-07-12

申请号：US16652991

申请日：2018-09-03

Applicant: INSTITUTE OF PROCESS ENGINEERING, CHINESE ACADEMY OF SCIENCES

Inventor： Hui Zhang ,  Tao Qi

IPC: C25C1/20 ,  C25C7/02 ,  C25C7/04

Abstract: A method for producing metallic silver by electro-deposition, including electrolyzing an electrolyte solution containing Ce(NO3)3 in an anode zone and an electrolyte solution containing AgNO3 in a cathode zone by using an electrolytic cell with a specific diaphragm, wherein the electrolyte solution in the anode zone is not allowed to enter the cathode zone. After the electrolyzing is complete, the metallic silver with a high purity is obtained at the cathode, and a Ce4+-containing solution is obtained in the anode zone.