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Some Studies of the Autotransformation of H‐Bentonite to Al‐Bentonite
Author(s) -
Davis L. E.,
Turner R.,
Whittig L. D.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600050011x
Subject(s) - bentonite , titration , diffraction , materials science , x ray crystallography , chemistry , analytical chemistry (journal) , nuclear chemistry , mineralogy , chromatography , geology , physics , optics , geotechnical engineering , inorganic chemistry
Duplicate samples of suspensions of H‐bentonite prepared by the method of Aldrich and Buchanan (1) were heated at 35°, 50°, 65°, 80° and 95°C. At appropriate time intervals, samples were removed, cooled to 25°C., and titrated electrometrically with NaOH solution. The titration curves were markedly differentiated functions of time and temperature of heating. Specimens heated for various periods at 95°C. were analyzed for the amount of replaceable Al and examined by X‐ray diffraction analysis. Replaceable Al increased progressively with time of heating. X‐ray diffraction analysis revealed that basal spacings and intensity of diffraction maxima increased with time of heating. The authors conclude that these changes are related to increase in the ratio of replaceable Al to H.