Large ore deposits for the extractionExtraction of copperCopper to support the green energy transitionEnergy transition are becoming increasingly scarce, and small deposits at remote locations will be required to close the gap. However, the capital cost for conventional solvent extractionSolvent extraction-electrowinningElectrowinning (SX-EW) is generally prohibitive to the economic recoveryRecovery of copperCopper from small and remote deposits. The infrastructure and power required for copper electrowinningCopper electrowinning are major cost contributors which adversely affect the feasibility of copperCopper cathodeCathode production. ElectrowinningElectrowinning (EW) plant and power costs can typically only be justified over an extended life of mineLife of mine associated with large ore bodies. The production of copperCopper sulphate as the pentahydrate (CuSO4·5H2O) is a viable alternative which reduces capital and operating costsOperating Cost by eliminating EW, thus enabling the economic processingProcessing of small and remote deposits. CopperCopper is recovered from the pregnant leach solution (PLSPregnant Leach Solution (PLS)) by means of a modified solvent extractionSolvent extraction (SX) circuit, where copperCopper saturation is achieved chemically in the strippingStripping stages to precipitate copperCopper sulphate. The copperCopper sulphate is recovered from the strip solution by means of centrifuging, which produces a baggable dry product ready for transport. The large energy requirements associated with conventional evaporative or coolingCooling crystallisation, and product drying, are therefore also eliminated. The electricity supplySupply to support either electrowinningElectrowinning or conventional crystallisationCrystallisation would typically not be available at remote locations, increasing the benefit of the low power consumption of the copperCopper sulphate process. A modularModular copperCopper sulphate production plant that is easily transported, assembled and disassembled provides the flexibility to relocate multiple times once a deposit is depleted. The ability to move the equipmentEquipment modules allows the capital cost of the plant to be amortised over multiple small miningMining sites, thus enabling the economic recoveryRecovery of copperCopper from small deposits. The capital and operating costOperating Cost benefits of such a modularModular copperCopper sulphate production plant are evaluated, and a case is presented for the use of this approach to recover copperCopper from small and remote ore deposits.

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Economic Recovery of Copper from Small and Remote Deposits by Transportable Copper Sulphate Production Modules

  • Michelle Weldhagen,
  • Sergio Burelli

摘要

Large ore deposits for the extractionExtraction of copperCopper to support the green energy transitionEnergy transition are becoming increasingly scarce, and small deposits at remote locations will be required to close the gap. However, the capital cost for conventional solvent extractionSolvent extraction-electrowinningElectrowinning (SX-EW) is generally prohibitive to the economic recoveryRecovery of copperCopper from small and remote deposits. The infrastructure and power required for copper electrowinningCopper electrowinning are major cost contributors which adversely affect the feasibility of copperCopper cathodeCathode production. ElectrowinningElectrowinning (EW) plant and power costs can typically only be justified over an extended life of mineLife of mine associated with large ore bodies. The production of copperCopper sulphate as the pentahydrate (CuSO4·5H2O) is a viable alternative which reduces capital and operating costsOperating Cost by eliminating EW, thus enabling the economic processingProcessing of small and remote deposits. CopperCopper is recovered from the pregnant leach solution (PLSPregnant Leach Solution (PLS)) by means of a modified solvent extractionSolvent extraction (SX) circuit, where copperCopper saturation is achieved chemically in the strippingStripping stages to precipitate copperCopper sulphate. The copperCopper sulphate is recovered from the strip solution by means of centrifuging, which produces a baggable dry product ready for transport. The large energy requirements associated with conventional evaporative or coolingCooling crystallisation, and product drying, are therefore also eliminated. The electricity supplySupply to support either electrowinningElectrowinning or conventional crystallisationCrystallisation would typically not be available at remote locations, increasing the benefit of the low power consumption of the copperCopper sulphate process. A modularModular copperCopper sulphate production plant that is easily transported, assembled and disassembled provides the flexibility to relocate multiple times once a deposit is depleted. The ability to move the equipmentEquipment modules allows the capital cost of the plant to be amortised over multiple small miningMining sites, thus enabling the economic recoveryRecovery of copperCopper from small deposits. The capital and operating costOperating Cost benefits of such a modularModular copperCopper sulphate production plant are evaluated, and a case is presented for the use of this approach to recover copperCopper from small and remote ore deposits.