Title:
Pb-free廃はんだからの有価金属の回収方法
Document Type and Number:
Japanese Patent JP5250683
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method of recovering tin or silver of high purity efficiently and economically at high yield from Pb-free waste solder.SOLUTION: The recovering method includes (1) a step of manufacturing an anode from Pb-free waste solder containing tin, silver or mixtures thereof, (2) a step of applying a current to the anode and the cathode which are manufactured from (1) in electrolysis solution containing chloride ion, (3) a step of forming anode slime in which the silver is concentrated on anode surface and electrodepositing the tin on the cathode in response to the reaction initiated by the applied current, and (4) a step of performing solid-liquid separation after dissolving chemically anode slime in which the silver is concentrated, manufacturing a rough silver anode with silver powder extracted from silver and filtrate as residue, and carrying out electrolytic refining of the silver in silver nitrate electrolysis solution.
Inventors:
Kim Min-Sook
Je-Chun
Kim Eun-Yoon
Je-Chun
Kim Eun-Yoon
Application Number:
JP2011227714A
Publication Date:
July 31, 2013
Filing Date:
October 17, 2011
Export Citation:
Assignee:
KOREA INSTITUTE OF GEOSCIENCE AND MINERAL RESOURCES
International Classes:
C25C1/20; C22B7/00; C22B11/00; C22B25/06; C25C1/00; C25C1/14
Domestic Patent References:
| JP2003268462A | ||||
| JP2000038692A | ||||
| JP61076695A | ||||
| JP2004315865A |
Foreign References:
| KR100981789B1 |
Attorney, Agent or Firm:
Masaki Hirota
Seiji Ozawa
Yusaku Tokai
Large High Toshiko
High Kazuya Tsu
Makoto Horiuchi
Seiji Ozawa
Yusaku Tokai
Large High Toshiko
High Kazuya Tsu
Makoto Horiuchi