Extract lithium from clay-type lithium ore by mixed acid and its mechanism--颗粒学报PARTICUOLOGY

Zhou, W., Xie, R., Tong, X., Xie, X., Liu, Y., & Zhao, Z. (2024). Extract lithium from clay-type lithium ore by mixed acid and its mechanism. Particuology, 91, 323-332. https://doi.org/10.1016/j.partic.2024.04.001

Extract lithium from clay-type lithium ore by mixed acid and its mechanism

Wuchang Zhou^{a b c}, Ruiqi Xie^{a b c *}, Xiong Tong^{a c *}, Xian Xie^{a c}, Yang Liu^{a b c}, Zhihui Zhao^{a b c}

a Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China
b Technology Innovation Center for Comprehensive Utilization of Strategic Mineral Resources, Ministry of Natural Resources, Chengdu, 610041, China
c National & Regional Engineering Research Center for Green comprehensive Utilization of Tailing Resources from Metal Minerals, Kunming, 650093, China

10.1016/j.partic.2024.04.001

Volume 91, August 2024, Pages 323-332

Received 3 February 2024, Revised 18 March 2024, Accepted 1 April 2024, Available online 16 April 2024, Version of Record 26 April 2024.

E-mail: ruiqixie@outlook.com; kgxiongtong@163.com

Highlights

• Leaching rate of lithium was 97.83% by mixed acid.

• Roasting and leaching temperature was 600 and 80 °C respectively.

• Chemical reaction occurred during roasting and leaching.

• Phase changed during roasting.

• Micromorphology & pore properties changed during roasting and leaching.

Abstract

A roasting-leaching test was carried out for the efficient utilization of clay-type lithium ore in the central region of Yunnan province. The test used the mixed acid of sulfuric acid and phosphoric acid as the leaching agent. Under the conditions of roasting temperature of 600 °C, roasting time of 1 h, liquid-solid ratio of 5:1, volume ratio of H₂SO₄ solution to H₃PO₄ solution of 45:5, leaching time of 2 h and leaching temperature of 80 °C, the leaching rate of lithium was as high as 97.83%. The leaching mechanism was studied by SEM, pore property analysis, XRD and XPS. It was found that the morphology of the ore changed obviously after roasting and leaching, and a certain degree of collapse and fragmentation occurred, which provided favorable spatial conditions for the leaching of lithium. The porosity, total intrusion volume and total pore area also increased after roasting and leaching, thus promoting the leaching of Li⁺. The results showed that chemical reaction taken placed during the roasting and leaching. The phase of the sample changed from chlorite, kaolinite and diaspore (boehmite) mainly to corundum, hematite, periclase and quartz after roasting. However, after leaching, no new phase was produced in the ore sample, and no S and P elements were found on the surface of the ore sample, indicating that the leaching mechanism of lithium might be the ion exchange between H⁺ and Li⁺.

Graphical abstract

Keywords

Clay-type lithium ore; Lithium extraction; Roasting; Leaching

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