Title:
RECOVERY METHOD OF SILVER FROM SILVER HALIDE-CONTAINING SCRAP RAW MATERIAL
Document Type and Number:
Japanese Patent JP2019157230
Kind Code:
A
Abstract:
To provide a method for efficiently recovering high-purity silver from a scrap raw material containing silver halide at a state of coexistence with many kinds of impurities.SOLUTION: There is provided a method for separating and recovering silver from a scrap raw material containing impurities such as alumina, silica, and iron in addition to silver halide, having a process for adjusting pH of a slurry manufactured by adding water to the scrap raw material with alkali hydroxide and reduction treating the silver halide under a condition with pH of 12 or more, a process for adding nitric acid to a solid component obtained by solid solution separation of the slurry after the reduction treatment to leach silver, a process for solid solution separating a nitric acid solution containing silver obtained by the exudation from the leach residue and then adding sodium chloride or hydrochloric acid to the nitric acid solution to generate silver chloride, and a process for adjusting pH of the slurry manufactured by adding water to the silver chloride with alkali hydroxide and reduction treating again under a condition of pH of 12 or more.SELECTED DRAWING: Figure 1
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Inventors:
SOHARA KEN
MAEBA KAZUYA
MAEBA KAZUYA
Application Number:
JP2018047659A
Publication Date:
September 19, 2019
Filing Date:
March 15, 2018
Export Citation:
Assignee:
OKUCHI DENSHI KK
International Classes:
C22B11/00; C01G5/02; C22B3/06; C22B3/44; C22B7/00
Attorney, Agent or Firm:
Noriyuki Tsujikawa