Abstract
A variety of well characterized particulate solids and ceramic membranes were used to acquire a range of data, over typical operating conditions, for the crossflow micro-filtration of micro-sized mineral suspensions. Sample data highlight the appropriate particle size for a given ceramic membrane, with the ratio of the mean particle size ( dp ) to mean membrane pore size ( dm ) lying between 2 and 10. In this case, the fouling resistance was caused mainly by the blocking of membrane pores and cake deposition on the membrane surface. The influence of various operating conditions including transmembrane pressure, crossflow velocity, suspension concentration and pH on the filtrate flux were related to the dp/dm ratio, and hence the optimum operating parameters for different dp/dm ratios were obtained. Based on these results, a method for the selection of membrane pore size and process parameters for crossflow microfiltration of micro-sized mineral suspensions using ceramic membranes was determined.
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