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Basic Principles & Test Methods
0 GENERAL CONSIDERATIONS
In all of the operations and methods dealt with in this SPG, Suspensions Processing Guide, a degree of solid-liquid separation is affected by expelling liquid from a suspension of particles by mechanical means. The driving force is a pressure gradient developed in the fluid, often called the capillary pressure gradient. In general this may either be developed directly by the application of positive or negative pressure to a cake, as in pressure or vacuum filtration, or may result from the application of a body force to the particles (that is, a gravitational, centrifugal or electrical force) which cause them to migrate relative to the fluid. The forces opposing or retarding the concentration or consolidation of the solid phase comprise the viscous drag associated with the outflow of liquid from the particulate mass, and the direct resistance of the matrix of particles forming ...