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PROPERTIES OF SOME AMERICAN KAOLINS AND A COMPARISON WITH ENGLISH CHINA CLAYS *
Author(s) -
Klinefelter T. A.,
Meyer W. W.
Publication year - 1935
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.1151-2916.1935.tb19373.x
Subject(s) - petrography , mineralogy , materials science , base (topology) , composite material , chemistry , mathematics , mathematical analysis
Nine American kaolins were studied. Chemical analyses were made and equivalent mineral compositions were calculated with the aid of petrographic examinations. Pyrometric cone equivalents, deflocculating characteristics, soluble‐salt contents, percentages of material composed of particles less than 0.6 micron in diameter, and base‐exchange capacities at pH7 were determined. Transverse strengths of dried and variously heat‐treated bars, made from mixtures of the clays with equal parts of potters' flint and shrinkages and apparent porosities of dried and progressively heat‐treated allclay specimens, were determined. Specimens of the dried and heated clays were examined for relative color, and linear thermal expansions of specimens heated to various temperatures were determined. The nine clays were divided into three groups and their properties compared with those of fifteen English china clays previously studied. Simulation of essential properties of the English china clays was accomplished in supplementary experiments by adding fluxes to American kaolins or kaolin blends.