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Slurry filtrability of potash alum
Author(s) -
Jones A. G.,
Mydlarz J.
Publication year - 1990
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450680325
Subject(s) - potash , slurry , dilution , precipitation , crystallization , crystal (programming language) , aqueous solution , particle size , mineralogy , particle size distribution , alum , materials science , particle (ecology) , analytical chemistry (journal) , chemistry , thermodynamics , chromatography , potassium , metallurgy , meteorology , geology , composite material , physics , computer science , programming language , oceanography
Crystal slurries produced both by cooling and by precipitation with acetone from aqueous solution in a continuous MSMPR crystallizer reported earlier (Jones and Mydlarz, 1990) are analysed in terms of the effect of their crystal size distribution and shape on filtrability characteristics. Crystals produced by precipitation are much smaller but more highly agglomerated than those from cooling crystallization and give rise to lower filter bed permeabilities, a performance which is slightly improved by precipitant dilution. The overall particle size is, however, similar in both modes and is relatively insensitive to crystallizer operating conditions. The filtrability data for the precipitated crystals are compared with predictions of the Carman‐Kozeny equation, assuming an idealized crystal shape. Relatively large scatter is observed, with the Kozeny coefficient, K, being in the range 2 to 8.