SCALE-UP OF MIXER-SETTLERS
1959; American Institute of Chemical Engineers; Linguagem: Inglês
ISSN
0360-7275
AutoresA.D. Ryon, F.L. Daley, R.S. Lowrie,
Tópico(s)Radioactive element chemistry and processing
ResumoThe rate of uranium extraction in the Dapex process is proportional to the cube root of power input for both batch and continuous flow if the extraction in the mixer only is measured. Mixers can be scaled-up by geometric similitude at constant power input per unit mixer volume, demonstrated in 6-, 12-, 20-, and 36-in. diam. mixers, representing a volumetric scale-up ratio of 200 to 1. The flow capacity of settlers is characterized by a band of dispersion at the interface, the thickness of which is a measure of the approach to flooding. Settlers can be scaled-up based on flow rate per unit cross-sectional area, demonstrated in settlers 6 in. to 16 ft. diam., representing an area scaleup ratio of 1000 to 1. Control of mixing to form water-inoil dispersions is recommended to minimize solvent entrainment and emulsions with solutions containing colloidal material which stabilize oil-in-water emulsions. (auth)
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