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Leaching Behavior and Mechanisms of Li, Rb, K, Sr, and Mg in Clay-Type Lithium Ore via a Roasting–Water Leaching Process
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Leaching Behavior and Mechanisms of Li, Rb, K, Sr, and Mg in Clay-Type Lithium Ore via a Roasting–Water Leaching Process
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Leaching Behavior and Mechanisms of Li, Rb, K, Sr, and Mg in Clay-Type Lithium Ore via a Roasting–Water Leaching Process
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Journal Article
Leaching Behavior and Mechanisms of Li, Rb, K, Sr, and Mg in Clay-Type Lithium Ore via a Roasting–Water Leaching Process
2025
Overview
The extraction of lithium from clay-type lithium ores has attracted significant attention, but the leaching behavior of associated elements, such as Rb, K, and Sr, remains less explored. This study quantitatively investigated the leaching behaviors and mechanisms of Li, Rb, K, Sr, and Mg in clay-type lithium ore through water leaching and roasting–water leaching processes. The results show that during direct water leaching, the leaching efficiency of K ranged between 10% and 13%, while Li and Sr exhibited lower extraction rates, requiring prolonged high-temperature leaching. Rb dissolution was minimal, and the leaching efficiency of Mg was significantly affected by temperature. In contrast, roasting–water leaching significantly enhanced the leaching efficiency, achieving extraction rates of 90.65% for Li, 92.91% for Rb, 75.85% for K, and 36.99% for Sr. However, Mg leaching was suppressed to below 1%. Roasting disrupted the original silicate and carbonate lattices, generating new phases that altered the ore’s microstructure into aggregated dense phases and needle-like porous phases upon water leaching, thereby facilitating the release of Li, Rb, K, and Sr. A research finding was that the new phase generated by magnesium inhibited its leaching, which indirectly enhanced subsequent Li, Rb, K, and Sr extraction and separation. These findings provide a quantitative foundation for optimizing multi-element co-extraction from clay-type lithium ores.
