Lithium was extracted from lithium-poor clay ores after short calcination by oxalic acid leaching  

作　　者：Fengyuan Wang Yuchun Yang Min Yang Yanling Tian Hong Yuan 

机构地区：[1]School of Chemistry and Chemical Engineering Guizhou University,Guiyang,550025,China

出　　处：《Particuology》2025年第3期204-214,共11页颗粒学报(英文版)

基　　金：supported by Research and Demonstration Project on Key Technologies for Efficient Separation and Extraction of Lithium Resources in Guizhou Province([2022]ZD007).

摘　　要：Limited research is available on lithium extraction technology for clay-type lithium deposits with relatively low lithium content.In this study,we investigated the effects of lithium extraction from lithium-poor clay ores using oxalic acid.The ore was first calcined and then fully mixed with solid oxalic acid powder,followed by water leaching.Raw material analysis revealed that the primary lithium-containing mineral was cookeite,with a lithium oxide content of 0.57%.The X-ray diffraction(XRD)patterns of the mineral phase before and after calcination at different temperatures revealed that the structure of the ores calcined at 300 and 400℃ was similar to that of the original ore.However,in the XRD patterns of the ore calcined at 500℃,certain characteristic peaks of cookeite weakened or disappeared.Upon calcination at 600℃,the hydroxyl group of cookeite was removed,amorphous phase of cookeite appeared,and maximum leaching yield was attained.Using response surface methodology optimization,the optimal calcination temperature and time;acid-to-ore and water-to-ore ratios;and reaction temperature and time were 600℃ and 2 min;1:1 and 4 mL/g;and 95℃ and 6 h,respectively.The leaching yield under these optimal conditions was 92.33%.The results of this study revealed that lithium ions could be effectively extracted from mines using oxalic acid.

关 键 词：Cookeite Oxalic acid Leaching of lithium Low liquid-solid ratio 

分 类 号：TF111.3[冶金工程—冶金物理化学]