Chris Akop
Copper-gold-pyrite ore types (with elevated pyrite content) are typically found in complex ore bodies which require a sequential flotation method to recover two products (copper - gold and pyrite - gold). Operating plants such as Telfer, Ok Tedi, and Batu Hijau use a lime circuit with selective collectors for efficient recovery. This work sought a simpler flotation circuit with lower operating and capital costs for treatment of such ores. After characterizing the ore, the objective was to apply bulk rougher flotation of both copper minerals and pyrite for the copper-gold-pyrite ore at natural pH, eliminating the need for lime or other pyrite depressants. The resulting sulphide concentrate was separated by depressing the pyrite to produce two products (copper and pyrite concentrates, both having significant amounts of gold). A comparison with a sequential circuit highlighted similar losses of chalcopyrite and pyrite in the tailing (less than 6%). In cleaning, the effective pH for pyrite depression was about 11.8. The copper recovery reached 70% with a grade of 20% copper.
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