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
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 language | English |
|---|---|
| Pages (from-to) | 113-125 |
| Journal | Colloids and Surfaces |
| Volume | 32 |
| DOIs | |
| Publication status | Published - 1988 |
| MoE publication type | A1 Journal article-refereed |