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General Observations of Constant Flow Rate Filter Pressing
Author(s) -
Lin ChingYao,
Kellett Bruce J.
Publication year - 1998
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1998.tb02592.x
Subject(s) - filter cake , slurry , materials science , mechanics , consolidation (business) , viscosity , ceramic , permeability (electromagnetism) , composite material , pressing , piston (optics) , chemistry , physics , chromatography , biochemistry , accounting , wavefront , membrane , optics , business
Consolidating powder compacts to a uniform and high particle packing density is a central aspect of ceramic processing. Experiments on the formation of powder compacts from slurries of differing properties and filter pressed under different conditions are presented. The influence of (1) piston velocity, (2) the solid content of the slurry, and (3) slurry viscosity are discussed. A simplified theory of nonuniform cake growth is developed. This theory is based on the assumption that the cake profile is time independent in a reference plane moving with the cake/slurry interface. Classical theory assumes uniform cake density, while more difficult finite element methods are required for calculating nonuniform cake growth conditions. This theory simplifies nonuniform cake consolidation mechanics and allows simple spread‐sheet‐type calculations on cake uniformity. Cake uniformity is an important goal in processing. Piston stress‐displacement behavior can be reasonably simulated from the fundamental cake properties (permeability and yield curve). The inverse, estimating the fundamental cake properties from piston stress‐displacement behavior, appears to provide only rough estimates of these characteristic parameters. The Kozeny‐Carman equation appears to reasonably fit the permeability behavior of these filter cakes.