文献类型：期刊文献

英文题名：Lithium Extraction from Lithium-Bearing Clay Minerals by Calcination-Leaching Method

作者：Liu, Jie[1,2];Xu, Rui[1,2];Sun, Wei[1,2];Wang, Li[1,2];Zhang, Ye[3]

机构：[1]Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China;[2]Cent South Univ, Key Lab Hunan Prov Clean & Efficient Utilizat Stra, Changsha 410083, Peoples R China;[3]East China Univ Sci & Technol, Natl Engn Res Ctr Comprehens Utilizat Salt Lake Re, Sch Chem Engn, Shanghai 200237, Peoples R China

年份：2024

卷号：14

期号：3

外文期刊名：MINERALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001192864700001)】；

基金：We are grateful to reviewers for their critical and constructive review.

语种：英文

外文关键词：lithium extraction; clay minerals; calcination; oxalic acid leaching

摘要：Lithium is a significant energy metal. This study focuses on the extraction of lithium from lithium-bearing clay minerals utilizing calcination combined with oxalic acid leaching. The relevant important parameters, leaching kinetics analysis, and the lithium extraction mechanism were deeply investigated. The results demonstrate that a high lithium recovery of 91.35% could be achieved under the optimal conditions of calcination temperature of 600 degrees C, calcination time of 60 min, leaching temperature of 80 degrees C, leaching time of 180 min, oxalic acid concentration of 1.2 M, and liquid-to-solid ratio of 8:1. According to the shrinkage core model, the leaching kinetics of lithium using oxalic acid followed a chemical reaction-controlled process. XRD, TG, and SEM analysis showed that the kaolinite, boehmite, and diaspore phases in raw ore transformed into corundum, quartz, and muscovite phase in calcination products when the calcination temperature was higher than 600 degrees C. Moreover, the expansion of the interlayer spacing of minerals during the calcination process could promote the lithium release. During the leaching process, lithium present in the layered silicates was efficiently recovered through ion exchange with the dissociated H+ from oxalic acid. This study could provide a promising guide for lithium extraction from lithium-bearing clay minerals.