Pregnant leach solution

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Pregnant leach solution or pregnant liquor solution (PLS) is acidic metal-laden water generated from stockpile leaching and heap leaching. Pregnant leach solution is used in the solvent extraction and electrowinning (SX/EW) process.^[1]^[2]

The portion of an original liquid that remains after other components have been dissolved by a solvent is called raffinate.

References

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^ http://www.rosemonteis.us/glossary/term/285^{[permanent dead link]}
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