Solvent Extraction
also known as SX · liquid-liquid extraction · LLE
Solvent extraction (SX) contacts an aqueous metal-bearing solution with an immiscible organic phase containing an extractant. The extractant selectively binds the target metal ion and carries it into the organic phase; the loaded organic is then stripped to release a purified, concentrated metal solution. Selectivity comes from extractant chemistry rather than physical size, so SX separates elements that filtration or precipitation cannot.
Why it matters in practice
SX is normally the step that sets final product purity, and its organic inventory is the largest single consumable cost in the circuit. Contactor selection and O/A ratio control therefore dominate both quality and operating cost.
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Equipment referenced in this entry
Related terms
Reference entry GL-SOLVENT-EXTRACTION. Definitions on this page describe engineering practice in hydrometallurgical process design; they are not a substitute for test work on your own material.