L4 - Lecture 4 Leaching Leaching Definition: to dissolve...

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Unformatted text preview: Lecture 4 Leaching Leaching Definition: to dissolve soluble matter from its mixture with an insoluble solid by using a liquid solvent. Examples: Deinking of newsprint Oils from seeds Tea from leaves Equipment 1. Percolation through a Stationary Bed Load the solid into the tank Percolate solvent through tank Equipment 1. Percolation through a Stationary Bed When solute content in extract falls below some low limit, stop, down load the solid from tank. Should have several tanks (or a battery) Equipment 2. Moving Bed Extractor Beds are moved counter current to solvent Bollman Extractor: Buckets of solid that move Hildebrandt Extractor: Screw moves solids Equipment 3. Dispersed Solid Leaching A set of stirred tanks. Essential for impermeable solids 4 Fresh solvent 3 2 1 Fresh solvent Extract Extract Solid Solid Extracted Extracted solid solid L # Flow rate of underflow or the liquid retained in porous solids, mass/time (solid is not...
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L4 - Lecture 4 Leaching Leaching Definition: to dissolve...

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