FTIR study of thionocarbamate adsorption on sulfide minerals

Jaakko Leppinen, C. Basilio, R.-H. Yoon

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)

Abstract

The adsorption of O-isopropyl-N-ethylthionocarbamate (IPETC) and O-isobutyl-N-ethoxy-carbonylthionocarbamate (IBECTC) on chalcocite, chalcopyrite and pyrite has been studied insitu by FTIR spectroscopy using the ATR technique. Thionocarbamates adsorb most strongly on chalcocite at pH 4–10, while on chalcopyrite and pyrite, adsorption continues to increase with decreasing pH.
Except at very low pH values, adsorption on chalcocite is 3–20 times higher than on chalcopyrite and pyrite. IPETC chemisorbs on chalcocite through sulfur below pH 6 and through both sulfur and oxygen above pH 6. IBECTC also chemisorbs through sulfur, but its bonding is weaker because of the adjacent C () group. Unlike IPETC, IBECTC forms physisorbed multilayers at higher concentrations.
Pyrite produces large amounts of sulfate-like oxidation products which, contrary to the case when using xanthates, are not displaced by the adsorption of thionocarbamates
Original languageEnglish
Pages (from-to)113-125
JournalColloids and Surfaces
Volume32
DOIs
Publication statusPublished - 1988
MoE publication typeA1 Journal article-refereed

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