Liquid-Liquid Extraction and Decantation: Ternary Phase Equilibria, Partition Coefficients, Mixer-Settlers, Centrifugal Extractors, and Coalescer Rag Layers

Deep End Era. Engineering with Sankalp · Oct 29, 2026 · 1h 11m

At a high-altitude copper solvent-extraction plant in the Atacama Desert, the organic-aqueous interface in the second extraction settler has swollen into a forty-centimetre-thick blanket of stable black crud. Loaded organic is carrying micro-droplets of high-chloride pregnant leach solution straight into the electrowinning tankhouse, pitting the stainless-steel cathodes. To understand why two immiscible liquids refuse to separate—and how engineers design ternary extraction cascades, mixer-settlers, agitated columns, Podbielniak centrifugal contactors, and coalescers—we build liquid-liquid…