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http://dx.doi.org/10.9727/jmsk.2016.29.3.103

Study of Heat and Acid Treatment for Hectorite in Turkey Boron Deposit  

Koo, Hyo Jin (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Lee, Bu Yeong (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Cho, Hyen Goo (Department of Geology and Research Institute of Natural Science, Gyeongsang National University)
Koh, Sang Mo (Convergence Research Center for Development of Mineral Resources, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.29, no.3, 2016 , pp. 103-111 More about this Journal
Abstract
Li-bearing hectorite, one member of trioctahedral smectite, occurred large in quantity and confirmed in Turkey western sedimentary boron deposit. Li-bearing hectorite attracted a particular attention because it is one of potential lithium resources. There have been no consensus for the change of hectorite due to heat and acid treatment although it is very important to use in industrial application. In this study, we examined changes of hectorite after heat and acid treatment as well as acid treatement followed by heating. We used clay ores collected in Bigadic deposit, which contained the highest $Li_2O$ content in Turkey boron deposits. Hectorite showed a strong endothermic reaction at $84^{\circ}C$ due to dehydration of absorbed water and interlayer water and a weak endothermic reaction above $600^{\circ}C$ owing to dehydration of crystallization water. The first endothermic reaction accompanied a large weight loss about 6%. Hectorite decomposed into enstatite, cristobalite and amorphous Fe material at $762^{\circ}C$ with exothermic reaction. When hectorite reacted with 3 kinds of 0.1 M acid during 1 hours, it had a good dissolution efficiency with $H_2SO_4{\geq}HCl$ > $HNO_3$ in order.
Keywords
Hectorite; Turkish Boron deposit; Li; Acid treatment; Heat treatment;
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Times Cited By KSCI : 4  (Citation Analysis)
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