Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 22    No. 7    July 2012

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Extraction of lithium from lepidolite using chlorination roasting-water leaching process
YAN Qun-xuan, LI Xin-hai, WANG Zhi-xing, WANG Jie-xi, GUO Hua-jun, HU Qi-yang, PENG Wen-jie, WU Xi-fei

School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China

Abstract:Chlorination roasting followed by water leaching process was used to extract lithium from lepidolite. The microstructure of the lepidolite and roasted materials were characterized by X-ray diffraction (XRD). Various parameters including chlorination roasting temperature, time, type and amount of chlorinating agents were optimized. The conditional experiments indicate that the best mass ratio of lepidolite to NaCl to CaCl2 is 1:0.6:0.4 during the roasting process. The extraction of lithium reaches peak value of 92.86% at 880 °C, potassium, rubidium, and cesium 88.49%, 93.60% and 93.01%, respectively. The XRD result indicates that the major phases of the product after roasting lepidolite with mixture of chlorinating agents (CaCl2 and NaCl) are SiO2, CaF2, KCl, CaSiO3, CaAl2Si2O8, NaCl and NaAlSi3O8.

 

Key words: lepidolite; lithium; chlorination roasting; water leaching

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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