Title:
LOW-COST AND HIGH-EFFICIENCY METHOD FOR RECOVERING PRECIOUS METALS FROM CIRCUIT BOARD COMPONENTS
Document Type and Number:
WIPO Patent Application WO/2023/097924
Kind Code:
A1
Abstract:
A low-cost and high-efficiency method for recovering precious metals from circuit board components, which method belongs to the technical field of waste resource recovery. The method mainly solves the problem of selective recovery of precious metals from a chlorination leachate, utilizes the basic principle of a oxidation-reduction reaction, and is carried out by using a mixed solution of sulfuric acid and hydrogen peroxide and a mixed solution of hydrochloric acid, sodium chloride and sodium chlorate; in addition, ammonia water and formaldehyde are further used to reduce silver. On the basis of the characteristic that the redox potential of gold and palladium ions is higher among general metals, gold and palladium ions in the chlorination leachate are selectively reduced into simple substances by using a reducing agent having a low price and a moderate reducibility, and then the simple substances are separated by means of filtration, thereby achieving resource recovery, such that not only is the technological process of precious metal recovery greatly shortened, but the method also has good economic benefits and is beneficial for industrialization due to a low price of the reducing agent. Moreover, a large amount of tail liquid is prevented from being generated to pollute the environment during the recovery process.
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Inventors:
YU JIAMEI (CN)
GUO JIAQI (CN)
GUO JIAQI (CN)
Application Number:
PCT/CN2022/080536
Publication Date:
June 08, 2023
Filing Date:
March 14, 2022
Export Citation:
Assignee:
UNIV BEIJING TECHNOLOGY (CN)
International Classes:
C22B11/00; C22B3/08; C22B3/10; C22B3/26; C22B3/44; C22B7/00
Domestic Patent References:
| WO2019229632A1 | 2019-12-05 |
Foreign References:
| CN114134337A | 2022-03-04 | |||
| CN105755289A | 2016-07-13 | |||
| CN104532005A | 2015-04-22 | |||
| CN101928840A | 2010-12-29 | |||
| CN112695199A | 2021-04-23 | |||
| US4662938A | 1987-05-05 |
Attorney, Agent or Firm:
BEIJING SIHAI TIANDA INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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