Sorption Extraction of Lithium from the Brines of the Pre-Aral Region Using Ion-Exchangers Under Static Conditions
Source abstract
Abstract
Samples of gel-type cation exchangers of the TOKEM nomenclature were tested for lithium extraction from multicomponent natural brines. The dependencies of the extraction of Li and other impurities—Na, Ca, and Mg—on the duration of the sorption process for the tested ion-exchange resins under static conditions are presented. Metal ions can be arranged according to the degree of extraction for each ion exchanger in a row: Ca2+ < Mg2+ < Li+, Na+. Testing of ion exchangers under static conditions on technological Li-containing solutions confirms the applicability of TOKEM-140 and TOKEM-160 cation exchangers for lithium extraction. For TOKEM-140, lithium extraction over time varies from 76.2% to 73.8% and for TOKEM-160—from 73.8% to 72.4%. The ionic background of natural brines has a significant effect on the capacity of ion exchangers for lithium and forms the following series Li+ << Mg2+ < Ca2+ << Na+ relative to the obtained concentrations of metal ions in natural brine. The overlay of IR spectra of TOKEM-140 and TOKEM-160 ion exchangers before and after saturation shows slight changes in their appearance, indicating that the lithium sorption process has occurred. The values of static exchange capacity (SEC) for TOKEM-140 and TOKEM-160 cation exchangers are identical.
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Research context
OpenAlex topics: Extraction and Separation Processes
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Affiliations
D.V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry JSC, Almaty 050013, Kazakhstan
Department of Metallurgy and Mineral Processing, Satbayev University, Almaty 050013, Kazakhstan
Funding
the Science Committee of the Ministry of Science and Higher Education of the Republic of Kazakhstan for 2023–2025 in the priority area “Research in the field of natural sciences”
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