The Impact of Partial Cake Reslurrying on Displacement Washing

Abstract Displacement washing is a common process to enhance product quality by removing solutes or contaminants from filter cakes after filtration. However, partial reslurrying of the cake surface during wash liquid application unintentionally contaminates the wash liquid early, reducing washing efficiency. This study identifies partial cake reslurrying as a novel limiting mechanism, demonstrated through experimental wash curves. The resulting wash liquid contamination, quantified by the cake reslurry ratio φ, deteriorates washing outcomes. Experimental evaluation and discussion of various process parameters highlight their influence on washing outcomes, leading to practical recommendations for the optimization of displacement washing processes.