Extraction of Li, K, and Rb from zinnwaldite by chlorination roasting with CaCl2

0579018 - ÚGN 2024 RIV NL eng J - Journal Article
Kristianová, E. - Hong Vu, N. - Dvořák, P. - Tomaško, T. - Vaculíková, Lenka
Extraction of Li, K, and Rb from zinnwaldite by chlorination roasting with CaCl2.
Minerals Engineering. Roč. 204, December 2023 (2023), č. článku 108420. ISSN 0892-6875. E-ISSN 0892-6875
Institutional support: RVO:68145535
Keywords : zinnwaldite * lithium * potassium * rubidium * chlorination * extraction
OECD category: Analytical chemistry
Impact factor: 4.8, year: 2022
Method of publishing: Limited access
https://www.sciencedirect.com/science/article/pii/S089268752300434X?via%3Dihub

The extraction of lithium, potassium, and rubidium from lithium mica zinnwaldite was investigated using high-temperature roasting with solid calcium chloride, followed by water leaching of the resulting sinters. This study examined the impact of roasting temperature, heating rate, roasting time, and the calcium chloride content within the roasting mixture on the extraction efficiency of alkali metals. The crucial factors of the roasting process are the roasting temperature and the calcium chloride content within the roasting mixture. The optimal results were achieved when a mixture containing four times the stoichiometric amount of calcium chloride was roasted at 1000 °C for 20 min with a heating rate of 10 °C/min. Under these conditions, 77 % of lithium, 90 % of potassium, and 90 % of rubidium were successfully extracted.
Permanent Link: https://hdl.handle.net/11104/0347894