Gold recovery from secondary waste of PCBs by electro-Cl2 leaching in brine solution and solvo-chemical separation with tri-butyl phosphate
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ilyas, Sadia | - |
dc.contributor.author | Srivastava, Rajiv Ranjan | - |
dc.contributor.author | Kim, Hyunjung | - |
dc.date.accessioned | 2023-09-04T07:12:59Z | - |
dc.date.available | 2023-09-04T07:12:59Z | - |
dc.date.created | 2023-07-21 | - |
dc.date.issued | 2021-05 | - |
dc.identifier.issn | 0959-6526 | - |
dc.identifier.uri | https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189687 | - |
dc.description.abstract | In the present study, sustainable recycling of gold from the secondary stream of waste printed circuit boards using brine leaching with electro-Cl-2 and solvo-chemical strategies was investigated. More than 99% of gold was leached in 2.0 mol.L-1 NaCl solution at pH, 1.0; electro-Cl-2 rate, 0.62 mmol min(-1); temperature, 50 degrees C; and time, 75 min. The kinetic data best fitted to the logarithmic model, while activation energy (16.3 kJ mol(-1)) indicated an intermediate-controlled leaching process. Results corroborated with the solution chemistry and reaction thermodynamics of the AueNaCl-(electro)Cl-2 system could reveal the stepwise reaction mechanism. In-situ generated Cl-2(g) first dissolved in a brine solution that forming Cl-2(aq), which subsequently converted to NaClO and diffused on gold particles to liberate the gold-chloro complex. Gold from the brine leach liquor was quantitatively separated using 0.5 mol.L-1 TBP at pH((eq)) = 0.5 and O:A = 1:1. The formation of ([HAuCl4 center dot 2TBP center dot H2O) over bar complex through the ion-pair solvation into the organic phase was supported by advanced spectral analysis. Finally, a highpurity gold with >99% efficiency was stripped by contacting the Au-loaded organic phase with 0.2 mol.L-1 thiosulfate solution; however, using the same concentration of thiourea yielded only a 94% efficacy. This study successfully eliminates the use of highly toxic lixiviants (like aqua-regia and cyanide) in gold metallurgy along with the regeneration and reusable benefits of the organic solvent (TBP). | - |
dc.language | 영어 | - |
dc.language.iso | en | - |
dc.publisher | ELSEVIER SCI LTD | - |
dc.title | Gold recovery from secondary waste of PCBs by electro-Cl2 leaching in brine solution and solvo-chemical separation with tri-butyl phosphate | - |
dc.type | Article | - |
dc.contributor.affiliatedAuthor | Kim, Hyunjung | - |
dc.identifier.doi | 10.1016/j.jclepro.2021.126389 | - |
dc.identifier.scopusid | 2-s2.0-85101134856 | - |
dc.identifier.wosid | 000638002600012 | - |
dc.identifier.bibliographicCitation | JOURNAL OF CLEANER PRODUCTION, v.295 | - |
dc.relation.isPartOf | JOURNAL OF CLEANER PRODUCTION | - |
dc.citation.title | JOURNAL OF CLEANER PRODUCTION | - |
dc.citation.volume | 295 | - |
dc.type.rims | ART | - |
dc.type.docType | 정기학술지(Article(Perspective Article포함)) | - |
dc.description.journalClass | 1 | - |
dc.description.isOpenAccess | N | - |
dc.description.journalRegisteredClass | scie | - |
dc.description.journalRegisteredClass | scopus | - |
dc.relation.journalResearchArea | Science & Technology - Other Topics | - |
dc.relation.journalResearchArea | Engineering | - |
dc.relation.journalResearchArea | Environmental Sciences & Ecology | - |
dc.relation.journalWebOfScienceCategory | Green & Sustainable Science & Technology | - |
dc.relation.journalWebOfScienceCategory | Engineering, Environmental | - |
dc.relation.journalWebOfScienceCategory | Environmental Sciences | - |
dc.subject.keywordAuthor | Electronic waste | - |
dc.subject.keywordAuthor | Gold recycling | - |
dc.subject.keywordAuthor | Electro-Cl-2 leaching | - |
dc.subject.keywordAuthor | Dissolution kinetics | - |
dc.subject.keywordAuthor | Ion-pair solvation | - |
dc.identifier.url | https://www.sciencedirect.com/science/article/pii/S0959652621006090?via%3Dihub | - |
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.
222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, Korea+82-2-2220-1365
COPYRIGHT © 2021 HANYANG UNIVERSITY.
Certain data included herein are derived from the © Web of Science of Clarivate Analytics. All rights reserved.
You may not copy or re-distribute this material in whole or in part without the prior written consent of Clarivate Analytics.