Title:
METHOD FOR RECYCLING ACIDIC COPPER-CONTAINING AND AMMONIUM-CONTAINING WASTE ETCHING SOLUTION
Document Type and Number:
WIPO Patent Application WO/2023/165021
Kind Code:
A1
Abstract:
Disclosed is a method for recycling an acidic copper-containing and ammonium-containing waste etching solution, the method comprising the following steps: subjecting an acidic copper-containing and ammonium-containing waste etching solution to be treated to a nanofiltration treatment, and thereby obtaining a permeated liquid and a trapped liquid; mixing the trapped liquid with sulfuric acid, and subjecting same to an evaporation treatment to obtain an evaporated mother liquor; and electrolyzing the evaporated mother liquor to obtain elemental copper. In the method of the present application, valuable components in the waste etching solution are separated and recycled through successive nanofiltration, evaporation and electrolysis operations according to the composition characteristics of the waste etching solution, all the components are thoroughly separated and can be reused, and the obtained copper product has a high purity and a high utilization value; and the method is easy to operate, has a low cost, is suitable for the recovery processing of a waste solution having complex components, and has no secondary pollution.
Inventors:
CHEN QI (CN)
Application Number:
PCT/CN2022/092517
Publication Date:
September 07, 2023
Filing Date:
May 12, 2022
Export Citation:
Assignee:
WUXI ZHONGTIAN SOLID WASTE DISPOSAL CO LTD (CN)
International Classes:
C25C1/12; C23F1/18; C23F1/46
Foreign References:
| CN104773887A | 2015-07-15 | |||
| CN101024533A | 2007-08-29 | |||
| CN110697958A | 2020-01-17 | |||
| CN101792220A | 2010-08-04 | |||
| CN101215062A | 2008-07-09 | |||
| GB1426643A | 1976-03-03 |
Other References:
"Titanium Electrode Reaction Engineering", 30 April 2009, METALLURGICAL INDUSTRY PRESS, CN, ISBN: 978-7-5024-4873-8, article ZHANG, ZHAOXIAN ET AL.: "Passage; Titanium Electrode Reaction Engineering", pages: 191 - 194, XP009549362
Attorney, Agent or Firm:
BEYOND ATTORNEYS AT LAW (CN)
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