A pulp-chemical study of skarn ore feed blends at the Ok Tedi concentrator, Papua New Guinea
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Ok Tedi Mining Limited, Papua New Guinea
Ian Wark Research Institute
Publication date: 2001-01-01
Physicochem. Probl. Miner. Process. 2001;35(1):125–140
Parallel metallurgical and pulp chemical surveys have been performed at Ok Tedi Mining Ltd (Papua New Guinea) for skarn ore feed blends. Metallurgical results showed a variation in recovery at similar grade, suggesting uniform depression of activated minerals by a precipitate. Significant activation of pyrite was also indicated. This paper highlights results of pulp chemical surveys, which characterise the slurries in terms of oxygen demand (indicating sulfide reactivity) and pulp particle surface coatings. The surface analytical techniques of ethylene diamine tetra acetic acid (EDTA) extraction, X-ray photoelectron spectroscopy (XPS) and time of flight secondary ion mass spectrometry (ToF-SIMS) analyses were used to confirm Cu activation of pyrite, and the depression of chalcopyrite by hydroxy precipitates of Ca, Fe, Al and Si.