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FUNDAMENTAL STUDY OF CLAY: II, MECHANISM OF DEFLOCCULATION IN THE CLAY‐WATER SYSTEM *
Author(s) -
Johnson A. L.,
Norton F. H.
Publication year - 1941
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.1151-2916.1941.tb14846.x
Subject(s) - sodium hydroxide , viscosity , silicate , sodium silicate , chemistry , adsorption , hydroxide , carbonate , casting , inorganic chemistry , sodium carbonate , sodium , chemical engineering , mineralogy , materials science , organic chemistry , composite material , engineering
A bstract The effect of bases, basic salts, neutral salts, acid salts, and acids on the viscosity of clay slips cleaned as described in Part I of this study is shown. From these data, a fundamental theory of deflocculation is built up, based on the fact that deflocculation requires the presence of OH anions and monovalent cations. The influence on the viscosity of small traces of soluble salts or adsorbed ions, which are present in commercial clays, is discussed. It is also shown why sodium silicate or carbonate works more satisfactorily than sodium hydroxide in the deflocculation of commercial casting slips.