CAKE FILTRATION-RATE EQUATIONS - A REVIEW OF CLASSICAL AND MODERN APPROACHES


HOSTEN C.

MINERALS ENGINEERING, vol.6, no.7, pp.775-783, 1993 (Peer-Reviewed Journal) identifier identifier

  • Publication Type: Article / Article
  • Volume: 6 Issue: 7
  • Publication Date: 1993
  • Doi Number: 10.1016/0892-6875(93)90008-b
  • Journal Name: MINERALS ENGINEERING
  • Journal Indexes: Science Citation Index Expanded, Scopus
  • Page Numbers: pp.775-783
  • Keywords: CAKE FILTRATION, FILTRATION RATE, AVERAGE SPECIFIC CAKE RESISTANCE

Abstract

Fundamental concepts of cake filtration - cake compressibility, liquid drag-pressure drop relationships, average porosity, and external mass balance - are presented. Two distinct approaches to the formulation of cake filtration rate, the classical and the modern theories, are critically reviewed. The definition of average specific cake resistance is re-examined. The equivalent specific cake resistance for a compressible cake is shown to be the harmonic mean of local specific cake resistances. Weaknesses of the classical theory in data analysis are pointed out. Recognition of the cake-filter medium interface by the modern theory as the rate-controlling part of the filtration system is stressed.