Catalytic effect of silver on arsenic-containing copper sulfide dissolution in acidic solution

Hajime Miki, Akinobu Iguchi, Tsuyoshi Hirajima, Keiko Sasaki

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Catalytic effects of silver on the dissolution of arsenic-containing copper sulfides such as enargite in acidic media were investigated. Leaching experiments showed that silver increased the enargite dissolution rate, and that the dissolution behavior was potential-dependent. The addition of silver ions and silver sulfide greatly enhanced enargite dissolution. Such behavior can be explained based on the following reaction model: enargite dissolution is enhanced by silver as the silver ions remove the hydrogen sulfide produced during enargite reduction, giving the more amenable copper sulfide. Thermodynamic calculations suggested that the addition of silver ions and controlling the potential would maintain a high enargite dissolution rate. Leaching experiments were therefore performed with the addition of silver sulfide and potential control using an automatic titration apparatus. Experimental results showed that a combination of these two factors gave high enargite dissolution; i.e., 75% copper was dissolved in 24 h at 0.750-0.850 V vs. the standard hydrogen electrode at 303 K.

Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalHydrometallurgy
Volume162
DOIs
Publication statusPublished - Jun 1 2016

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Arsenic
Sulfides
Silver
Copper
Dissolution
Ions
Leaching
Hydrogen Sulfide
Titration
Hydrogen sulfide
Hydrogen
Experiments
Thermodynamics
Electrodes

All Science Journal Classification (ASJC) codes

  • Metals and Alloys
  • Industrial and Manufacturing Engineering
  • Materials Chemistry

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Catalytic effect of silver on arsenic-containing copper sulfide dissolution in acidic solution. / Miki, Hajime; Iguchi, Akinobu; Hirajima, Tsuyoshi; Sasaki, Keiko.

In: Hydrometallurgy, Vol. 162, 01.06.2016, p. 1-8.

Research output: Contribution to journalArticle

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