Title:
METHOD FOR PURIFICATION AND NICKEL, COBALT, AND GERMANIUM REMOVAL OF AQUEOUS ZINC SULFATE SOLUTION
Document Type and Number:
WIPO Patent Application WO/2021/147816
Kind Code:
A1
Abstract:
A method for purification of an aqueous zinc sulfate solution. Copper and cadmium are removed from a neutral leaching solution by using a zinc powder, a zinc powder and a copper-antimony activator are added at a temperature of 80-95°C for purification and removal of cobalt, nickel, and germanium, and a copper-antimony activator, a zinc powder, and a small amount of sulfuric acid or waste electrolytic solution are added according to the concentration of cobalt in a solution. For a solution after first-stage copper and cobalt removal, which contains 2-120 mg/l of cobalt, 0.02-0.3 mg/l of germanium, and 0.02-4 mg/l of nickel, and 5-120 mg/l of cadmium, a purification effect in which the purified solution contains less than 0.1 mg/l of cobalt, less than 0.02 mg/l of germanium, and less than 0.1 mg/l of nickel can be achieved after 90-150 minutes; deep purification of a solution can be achieved using a variety of different zinc powders; the present invention is suitable for purification systems of zinc electrolysis plants.
Inventors:
ZHANG XU (CN)
GENG HUI (CN)
DUAN ZHIYONG (CN)
ZHANG YUNPENG (CN)
SHENG QINGFENG (CN)
CUI PENG (CN)
GENG HUI (CN)
DUAN ZHIYONG (CN)
ZHANG YUNPENG (CN)
SHENG QINGFENG (CN)
CUI PENG (CN)
Application Number:
PCT/CN2021/072496
Publication Date:
July 29, 2021
Filing Date:
January 18, 2021
Export Citation:
Assignee:
KUNMING HANCHUANG SCIENCE AND TECH CO LTD (CN)
International Classes:
C22B19/20; C22B3/00; C22B3/44; C22B19/00; C25C1/00; C25C1/16
Foreign References:
| CN111254292A | 2020-06-09 | |||
| CN111172408A | 2020-05-19 | |||
| CN103966443A | 2014-08-06 | |||
| CN101988155A | 2011-03-23 | |||
| CN106086440A | 2016-11-09 | |||
| SU727709A1 | 1980-04-20 | |||
| GB1055759A | 1967-01-18 |
Attorney, Agent or Firm:
KUNMING JINWEI PATENT & TRADEMARK AGENT CO., LTD. (CN)
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