Title:
ALL-COMPONENT RAPID MICROWAVE DIGESTION AND NOBLE METAL ION LIQUID EXTRACTION METHOD FOR WASTE CIRCUIT BOARD
Document Type and Number:
WIPO Patent Application WO/2021/147342
Kind Code:
A1
Abstract:
An all-component rapid microwave digestion and noble metal ion liquid extraction method for a waste circuit board, belonging to the field of hydrometallurgy. As microwave can penetrate a leaching medium and directly heat a circuit board, microwave-assisted leaching can enhance mass transfer and heat transfer in a traditional leaching process, greatly reduce leaching time, and increase leaching efficiency. Before leaching, there is no need to crush a waste circuit board, saving energy and protecting the environment. A temperature rise process and a reaction time can be controlled in a reaction, and the whole process is conducted under a sealed condition, avoiding the loss of heat during a leaching process, providing a high leaching rate and high selectivity of valuable metal, achieving the efficient leaching of valuable metal. A noble metal leaching solution is extracted using an imidazole ionic liquid which has high selectivity for gold, avoiding co-extraction with ions such as nickel and copper. The extraction of a noble metal leaching solution by means of an ionic liquid is a clean and green recovery method, and the overall recovery rate of gold, nickel, and copper can reach more than 99%.
Inventors:
WU YUFENG (CN)
YAN JIEWEN (CN)
LI BIN (CN)
YAN JIEWEN (CN)
LI BIN (CN)
Application Number:
PCT/CN2020/114544
Publication Date:
July 29, 2021
Filing Date:
September 10, 2020
Export Citation:
Assignee:
UNIV BEIJING TECHNOLOGY (CN)
International Classes:
C22B7/00; C22B3/36; C22B11/00; C22B15/00; C22B23/00
Foreign References:
| CN111172400A | 2020-05-19 | |||
| CN109609767A | 2019-04-12 | |||
| CN106148704A | 2016-11-23 | |||
| CN110484724A | 2019-11-22 | |||
| CN104775034A | 2015-07-15 | |||
| CN1119554A | 1996-04-03 |
Other References:
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"Application and Research of Ionic Liquids", 31 October 2009, SHAANXI SCIENCE AND TECHNOLOGY PRESS, CN, ISBN: 7-5369-4681-3, article ZHANG, YA: "Passage; Application and Research of Ionic Liquids", pages: 1 - 4, XP009529400
MA, RONGJUN: "Passage; Extractive Metallurgy", EXTRACTIVE METALLURGY, 31 August 2009 (2009-08-31), CN, pages 700 - 708, XP009529401, ISBN: 978-7-5024-4875-2
MASILELA MTHOBISI, SEHLISELO NDLOVU: "Extraction of Ag and Au from Chloride Electronic Waste Leach Solutions Using Ionic Liquids", JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING, ELSEVIER BV, NL, vol. 7, no. 1, 27 November 2018 (2018-11-27), NL, XP055831204, ISSN: 2213-3437, DOI: 10.1016/j.jece.2018.11.054
KATSUTA SHOICHI, WATANABE YUTA, ARAKI YUSUKE, KUDO YOSHIHIRO: "Extraction of Gold(III) from Hydrochloric Acid into Various Ionic Liquids: Relationship between Extraction Efficiency and Aqueous Solubility of Ionic Liquids", ACS SUSTAINABLE CHEMISTRY & ENGINEERING, AMERICAN CHEMICAL SOCIETY, US, vol. 4, no. 2, 1 February 2016 (2016-02-01), US, pages 564 - 571, XP055831205, ISSN: 2168-0485, DOI: 10.1021/acssuschemeng.5b00976
LIU QING-SHAN, ZHAO LI-WEI: "Advances in Metal Ion Extraction with Ionic Liquids", JOURNAL OF SHENYANG AGRICULTURAL UNIVERSITY, vol. 49, no. 4, 1 January 2018 (2018-01-01), pages 498 - 512, XP055831320, ISSN: 1000-1700, DOI: 10.3969/j.issn.1000-1700.2018.04.017
"Principles of Chemical Engineering (Second Edition)", 31 August 2009, CHINA MEDICAL SCIENCE AND TECHNOLOGY PRESS, CN, ISBN: 978-7-5067-4257-3, article HE, ZHICHENG (ED.): "Passage, "Principles of Chemical Engineering (Second Edition)"", pages: 356 - 359, XP009529375
"Mass Spectrometry and its Coupling Techniques - Application in Health Inspection", 31 January 2015, SICHUAN UNIVERSITY PRESS, CN, ISBN: 978-7-5614-8242-1, article GAO, GE: "5. Determination of ten heavy metal elements in drinking water and food by ICP-MS", pages: 279 - 280, XP009529397
"Application and Research of Ionic Liquids", 31 October 2009, SHAANXI SCIENCE AND TECHNOLOGY PRESS, CN, ISBN: 7-5369-4681-3, article ZHANG, YA: "Passage; Application and Research of Ionic Liquids", pages: 1 - 4, XP009529400
MA, RONGJUN: "Passage; Extractive Metallurgy", EXTRACTIVE METALLURGY, 31 August 2009 (2009-08-31), CN, pages 700 - 708, XP009529401, ISBN: 978-7-5024-4875-2
Attorney, Agent or Firm:
BEIJING SIHAI TIANDA INTELLECTUAL PROPERTY AGENCY LTD. (CN)
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