Title:
METHOD FOR RECOVERING PRECIOUS METAL FROM PRECIOUS METAL-CONTAINING WASTE CATALYST
Document Type and Number:
WIPO Patent Application WO/2021/212936
Kind Code:
A1
Abstract:
The present invention relates to a method for recovering a precious metal from a precious metal-containing waste catalyst, comprising the following steps: (i) at least partially dissolving a precious metal-containing waste catalyst in an alkaline aqueous solution; (ii) filtering to obtain a precious metal-containing filtrate and a precious metal; (iii) treating the filtrate by means of a reducing agent; and (iv) separating the precious metal from the treated filtrate, wherein step (iii) is carried out for 2-4 hours at a pressure of 8-12 bar and a temperature of 190-210 °C. The method of the present invention has a simple process and a high recovery rate, and the separated filtrate contains 1 ppm by weight or less of a precious metal.
Inventors:
ZHANG BIN (CN)
CHEN CHEN (CN)
CHEN CHEN (CN)
Application Number:
PCT/CN2021/073038
Publication Date:
October 28, 2021
Filing Date:
January 21, 2021
Export Citation:
Assignee:
HERAEUS PRECIOUS METAL TECH CHINA CO LTD (CN)
International Classes:
C22B11/00; C22B7/00
Foreign References:
| CN111411240A | 2020-07-14 | |||
| CN103194606A | 2013-07-10 | |||
| CN1769504A | 2006-05-10 | |||
| US20190284660A1 | 2019-09-19 | |||
| CN101074458A | 2007-11-21 | |||
| CN102676836A | 2012-09-19 | |||
| CN108707751A | 2018-10-26 |
Attorney, Agent or Firm:
ZHONGZI LAW OFFICE (CN)
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