Leaching stripping factor

Generally, the solids are not stracturally homogeneous, but the solid and liquid nevertheless wiU be called phases and leaching will be treated as a two-phase, mass transfer process. The solid consists of a matrix of insoluble solids, the marc, and the occluded solution. It may also contain undissolved solute and a nonextractable secondaiy phase, for example, coffee oil in water-soaked coffee grounds. This secondary phase is treated as part of the marc. Dimensionless parameters that can affect solute transfer include the solute equilibrium distribution coefficients, m and M the Fick number, r the stripping factor, a the Biot number, Bi and the Peclet number, Pe. These parameters are defined more precisely in the Notation section. 

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