Mass Transfer
Stage efficiency in a leaching process depends on the

Time of contact between the solid and the solution
Rate of diffusion of the solute through the solid and into the liquid
Vapour pressure of the solution
Both A & B

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Mass Transfer
Bollman extractor

Is a centrifugal extractor
Is used for extraction of oil from oilseed
Is a static bed leaching equipment
Employs only counter-current extraction

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