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http://dx.doi.org/10.9727/jmsk.2016.29.4.167

Lithium Extraction from Smectitic Clay Occurring in Lithium-bearing Boron Deposits in Turkey  

Lee, Won-Jong (Korea Institute of Geoscience and Mineral Resources)
Yoon, Soh-joung (Korea Institute of Geoscience and Mineral Resources)
Chon, Chul-Min (Korea Institute of Geoscience and Mineral Resources)
Heo, Chul-Ho (Korea Institute of Geoscience and Mineral Resources)
Lee, Gill-Jae (Korea Institute of Geoscience and Mineral Resources)
Lee, Bum-Han (Korea Institute of Geoscience and Mineral Resources)
Cicek, Murat (General Directorate of Mineral Research and Exploration)
Publication Information
Journal of the Mineralogical Society of Korea / v.29, no.4, 2016 , pp. 167-177 More about this Journal
Abstract
Smectitic clays, occurring in Kırka and Bigadiç boron evaporite deposits formed in Miocene playa lake environment in Turkey, contain $LiO_2$ 0.02-0.21% and 0.16-0.30%, respectively, and boron tailings are also reported to contain $LiO_2$ 0.04-0.26%. Lithium in smectitic clays was identified to be retained in hectorite. The XRD results revealed that hectorite was contained in 25.7% and 79.7% of Kırka and Bigadiç deposit samples respectively. In this study, we selected a clay sample from each deposit with lithium content of ~0.18% and estimated extractable lithium by acid treatment and roasting method commercially applicable to lithium resources, such as lepidolite and hectorite. When 1 g of crushed clay (particle size less than $74{\mu}m$) was reacted with 200 mL of 0.25 M HCl solution, the amount of lithium dissolved increased with the increase of reaction time up to 10 hours for both samples. Reaction time longer than 10 hours did not significantly increased the amount of lithium dissolved. After 10 hours of reaction, 89% of lithium in the clay sample from the Kırka deposit was dissolved, while 71% of lithium was dissolved from the Bigadiç deposit tailing sample. 87% of lithium in the clay sample from the Kırka deposit was extracted and 82% of lithium was extracted from the Bigadiç deposit tailing sample by the roasting extraction method, where clays were leached after a thermal treatment at $1,100^{\circ}C$ for 2 hours with $CaCO_3$ and $CaSO_4$.
Keywords
Acid treatment; roasting method; Kirka; Bigadic; hectorite; Li-extraction;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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