Scale-up of a mixer-settler extractor using a unit operations approach
The results of scale-up studies on a continuous, multistage horizontal mixer-settler extractor are presented. The chemical and mechanical system involves the separation of lanthanum from a mixture of rare earth chlorides using di(2-ethylhexyl) phosphoric acid as the solvent and dilute HCl as a scrub solution in a bench scale extractor. Each stage has a hold-up of 2.6 l. A single stage unit is utilized for scale-up studies. Results are obtained on four sizes of geometrically similar units, the largest being six times the volume of the original bench size. A unit operations technique is chosen so that mixing and settling can be examined independently. Variables examined include type of continuous phase, flow rate of inlet streams, and power input to the mixer. Inlet flow-rate ratios are kept constant for all tests. Two potential methods of unbaffled pump-mixer scale-up are explored; the maintenance of constant impeller tip speed and constant power input. For the settler, the previously successful method of basing design on constant flow-rate per unit cross-sectional area is used.
- Research Organization:
- Ames Lab., IA
- OSTI ID:
- 7345569
- Journal Information:
- Trans. Soc. Min. Eng. AIME; (United States), Journal Name: Trans. Soc. Min. Eng. AIME; (United States) Vol. 260:1; ISSN TMENA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400105* -- Separation Procedures
CHLORIDES
CHLORINE COMPOUNDS
EFFICIENCY
ELEMENTS
ESTERS
EXTRACTION APPARATUSES
FLUID FLOW
HALIDES
HALOGEN COMPOUNDS
HDEHP
HYDROCHLORIC ACID
HYDROGEN COMPOUNDS
INORGANIC ACIDS
LANTHANUM
LIQUID FLOW
METALS
MIXER-SETTLERS
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHORIC ACID ESTERS
RARE EARTH COMPOUNDS
RARE EARTHS
SCALING LAWS
SEPARATION PROCESSES