Recovery of precious metals by an electrochemical deposition method

J. Paul Chen*, L. L. Lim

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

65 Scopus citations

Abstract

Conversion of soluble precious metals into a solid form for further reuse was studied by using an electrochemical deposition approach. It was found that the metal recovery followed a first-order reaction kinetics. The distance between the electrodes had no much impact on the recovery, while higher mixing led to faster kinetics. The presence of humic acid (HA) with lower concentration (<20 mg l-1) did not have impact on the recovery. When its concentration was increased to 50 mg l-1, it decreased the metal reduction. Presence of ethylene diamine tetraacetic acid (EDTA) and ionic strength slightly reduced the copper recovery rate. Around 50% removal of for HA and EDTA was achieved. In the competing environment, metal recovery was in the following order: silver > lead > copper. X-ray photoelectron spectroscopic and scanning electronic microscopic analysis of the reduced metals demonstrated that the depositions were composed of mainly elemental metals together with their oxides which were due to the oxidation.

Original languageEnglish
Pages (from-to)1384-1392
Number of pages9
JournalChemosphere
Volume60
Issue number10
DOIs
StatePublished - Sep 2005
Externally publishedYes

Keywords

  • EDTA
  • Electrochemical deposition
  • Humic acid
  • Ionic strength
  • Metal recovery

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