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Author:

Ding, Yunji (Ding, Yunji.) | Zhang, Shengen (Zhang, Shengen.) | Liu, Bo (Liu, Bo.) (Scholars:刘博) | Li, Bin (Li, Bin.)

Indexed by:

EI Scopus SCIE

Abstract:

Electronic waste (e-waste) is one of the fastest growing and most valuable waste. In industry, the final disposal of e-waste is usually through copper smelting and followed by electro-refining. Compared to the conventional copper anode slime, the anode slime from e-waste smelting is much more valuable and complicated. The major components are gold, silver, tin, lead and antimony. In this paper, an integrated process has been put forward to recycle these metals. To decrease the dissolution of impurities and enhance gold recovery rate, NaClO3-NaCl-H2SO4 solution was chosen as leaching agent for gold recovery. The concentration of Cl- and H+ can be controlled by the leaching system. After selective extraction of gold and silver, the residue mainly consists of PbSO4, SnO2 and Sb2O5. Then PbSO4 was dissolved and removed in HCl-NaCl-CaCl2 solution at 95 degrees C. SnO2 and Sb2O5 were transformed into soluble materials via alkali smelting with NaOH. The Na2SnO3 was recovered by washing, evaporation and crystallization. The insoluble matter, mainly containing NaSbO3, was leached by the HCl-NaCl solution, followed by hydrolysis and aging. The results showed that, under the optimum conditions, the direct recovery ratio of Au, Pb, Sn, and Sb was 98.1%, 99.1%, 92.3% and 97.1%, respectively. Moreover, the wastewater was reused as much as possible. This integrated process is highly efficient and environmental conservation. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword:

Integrated process Alkali smelting E-waste Copper anode slime Selective leaching

Author Community:

  • [ 1 ] [Ding, Yunji]Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
  • [ 2 ] [Zhang, Shengen]Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
  • [ 3 ] [Liu, Bo]Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China
  • [ 4 ] [Li, Bin]Beijing Univ Technol, Inst Recycling Econ, Beijing 100124, Peoples R China

Reprint Author's Address:

  • 刘博

    [Zhang, Shengen]Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China;;[Liu, Bo]Univ Sci & Technol Beijing, Inst Adv Mat & Technol, Beijing 100083, Peoples R China

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Source :

JOURNAL OF CLEANER PRODUCTION

ISSN: 0959-6526

Year: 2017

Volume: 165

Page: 48-56

1 1 . 1 0 0

JCR@2022

ESI Discipline: ENGINEERING;

ESI HC Threshold:165

CAS Journal Grade:2

Cited Count:

WoS CC Cited Count: 45

SCOPUS Cited Count: 43

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 9

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