Mass Transfer
Stage efficiency in a leaching process depends on the

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

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Mass Transfer
Channelling is most severe

At very high liquid flow rate
In towers packed with stacked packing
In dumped packing of regular units
In towers packed randomly with crushed solids

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