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A new technology created to significantly improve the recovery of copper from solvent extraction organics.


  • Acid sulfate copper leach process liquors

  • Use a soluble pH modifier that produces no precipitate in mixers

  • Indirectly uses the cheapest alkali – limestone


  • Neutralise acid generated in the extraction mixer-settlers to drive higher copper extraction

  • Higher reagent loading

  • No complex pH control necessary

  • Easily incorporated in a “standard” Cu-SX flowsheet

  • Simple retrofit to an existing plant

Final raffinate concentration reduced from approx. 420 ppm Cu to <50 ppm Cu with the addition of pH modifier.


Patent lodged Application# PCT/AU2014/001024


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