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With the aim of improving recovery at Konkola concentrator on the Copperbelt Province of Zambia, controlled Potential Sulphidisation (CPSControlled Potential Sulphidisation (CPS)) was studied at laboratory and plant scale. Eh was varied at a range of −50 mV to −550 mV and intervals of −50 mV. Laboratory tests showed a significant increase of recovery for ASCu from 39% at −50 mV to 56% at −350 mV. Three distinct steps were apparent as the potential became more negative, these increasing recovery from −50 to −300 mV; plateau in narrow range of −300 to −350 mV; and sharp decline at potential more negative than −400 mV. The response of AICu followed a similar trend but peaked at less negative potentials. The effect of NaHS dosage on Eh was studied and the dosing of NaSHNaSH was between 121 and 261 g per tonne of ore for optimum Eh between −300 and −350 mV. A preliminary cost–benefit analysis at Cu metal price of US$5,880/tonne and taking into account other extra direct operating costs indicated that CPSControlled Potential Sulphidisation (CPS) has potential to earn additional revenue of approximately US$1.1 m per annum.

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Improving Copper Recovery by Froth Flotation at Konkola Concentrator Using Controlled Potential Sulphidisation (CPS)

  • 会议论文

  • 发表日期：

    2026年

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  • Henry Chilombo,
  • Wilfred Mulenga Mwenya,
  • Fredrick Chileshe,
  • Cornwell Tepa,
  • Yotamu Rainford Stephen Hara

摘要

With the aim of improving recovery at Konkola concentrator on the Copperbelt Province of Zambia, controlled Potential Sulphidisation (CPSControlled Potential Sulphidisation (CPS)) was studied at laboratory and plant scale. Eh was varied at a range of −50 mV to −550 mV and intervals of −50 mV. Laboratory tests showed a significant increase of recovery for ASCu from 39% at −50 mV to 56% at −350 mV. Three distinct steps were apparent as the potential became more negative, these increasing recovery from −50 to −300 mV; plateau in narrow range of −300 to −350 mV; and sharp decline at potential more negative than −400 mV. The response of AICu followed a similar trend but peaked at less negative potentials. The effect of NaHS dosage on Eh was studied and the dosing of NaSHNaSH was between 121 and 261 g per tonne of ore for optimum Eh between −300 and −350 mV. A preliminary cost–benefit analysis at Cu metal price of US$5,880/tonne and taking into account other extra direct operating costs indicated that CPSControlled Potential Sulphidisation (CPS) has potential to earn additional revenue of approximately US$1.1 m per annum.