Leaching cling

Solids feed preparation usually plays a crucial role in leaching processes. The use of line particles usually win spied up diffusive transfer of solutes from the solid to the extract. However, if too fine a size is used, extract may not be able to flow Ibrongh solid beds as rapidly as desired, flow pressure drop may be excessive and cause undesirable bed compaction, displacement instability will he enhanced, extract cling will increase, solid-liquid separation difficulty may increase, and excessive amocrats of intracellular colloidal material may be released. Therefore, the use of a compromise particle size is almost invariably desirable. Except for flaked oilseeds, where flake thicknesses of the order of 0.2 mat are necassery to obtain adequate oil release, particle diameters or thicknesses in the 2-5 mm range usually represent a good choioe for industrial scale extractions. 

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