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Temperature Effects and pH Value on Free Swell Behaviors of Bentonite Solutions
Abstract:
Swelling behaviors of powder and granular type sodium bentonites in permeate solutions such as NaCl, KCl, MgCl2, CaCl2, distilled water and in HCl and NaOH (with different pH values) under different temperatures were investigated. Swelling behaviors of these bentonites were dependent on strength, reactivity power and physical form of ion, and temperature and pH value of permeate solution. +1 ion solution showed higher swell volumes than +2 ion solution. Distilled water showed highest swell volumes among these tested solutions. Powder type sodium bentonite showed higher swells volume than granular type bentonite. Higher temperatures brought quickly the bentonite to a stable swell volume state. The pH value also affected on swelling volumes of bentonite as lower pH values (pH<3) increased and higher pH values (11<pH<12) decreased the swell volume of powder and granular type sodium bentonite.
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44-51
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Online since:
June 2014
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© 2014 Trans Tech Publications Ltd. All Rights Reserved
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