Principles and operation of an air operated mixer‐settler

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Abstract
A mixer‐settler for continuous countercurrent solvent extraction is described in which the mixing and pumping of the liquid phases are achieved by air streams.The operating principles of this mixer‐settler are presented in theory and confirmed by experiment. Measurements include interface heights, capacity, air requirements and entrainment of aqueous phase in the solvent under various operating conditions.The main advantages claimed for this unit are.1) Mechanical simplicity and consequent freedom from maintenance.2) Pumps and interface controllers are not required between individual stages.3) Compactness for a given separation.4) Low energy requirements.

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