Title:
SILVER RECOVERY METHOD
Document Type and Number:
Japanese Patent JP2020132957
Kind Code:
A
Abstract:
To provide a method of efficiently recovering silver by separating lead and tin, from a raw material including silver and also lead, tin, bismuth, antimony and the like.SOLUTION: There is provided the silver recovery method for recovering silver by separating impurities such as lead and tin, from a raw material including chlorides of silver, lead, bismuth, antimony, and tin. The silver recovery method includes: a carbonation step of carbonating the raw material to convert lead chloride included in the raw material to lead carbonate; a nitric acid exudation step of adding nitric acid to a carbonated raw material to exude selectively lead carbonate, and performing solid-liquid separation; a hydrochloric acid exudation step of adding hydrochloric acid to a nitric acid exudation sullage to exude bismuth, and antimony, and performing solid-liquid separation; a silver reduction step of adding sulfuric acid to a hydrochloric exudation sullage, and further adding an iron powder to reduce the silver chloride of the hydrochloric exudation sullage to be crude silver; and an oxidation purification step of adding a soda-silicate slug to an iron reduction sullage, oxidation-melting, and making the slug absorb tin and impurities to separate and recover crude silver.SELECTED DRAWING: Figure 1
Inventors:
SATO RYOSUKE
NABEI ATSUHIRO
RINAT MIRVARIEV
NABEI ATSUHIRO
RINAT MIRVARIEV
Application Number:
JP2019028906A
Publication Date:
August 31, 2020
Filing Date:
February 20, 2019
Export Citation:
Assignee:
MITSUBISHI MATERIALS CORP
International Classes:
C22B11/02; C22B3/06; C22B3/08; C22B3/10; C22B3/44; C22B7/00; C22B9/02; C22B9/10
Domestic Patent References:
| JP2001316736A | 2001-11-16 | |||
| JP2000109939A | 2000-04-18 | |||
| JPS452834B1 |
Attorney, Agent or Firm:
Hiroshi Chiba