The data of the article"A Novel Multistage Synergistic Roasting-Leaching-Adsorption Strategy for Ef-ficient Lithium Extraction from Coal Fly Ash"

However, the low lithium content in coal fly ash, along with its occurrence in chemically inert glass phases, makes efficient and selective ex-traction challenging via conventional approaches. In this study, a multi-stage synergistic strategy “roasting-alkali leaching-adsorption” was proposed to enhance lithium recovery.

The Si-O-Al bonds in aluminosilicate glass phase of coal fly ash were effectively disrupted by calcination at 900℃ for 2 h in the presence of sodium sulfate. Then, the resulting calcine was subjected to alkaline leaching using 1 mol·L-1 NaOH at 70℃ with a liquid-to-solid ratio of 5:1, leading to the selective release of lithium ions. Finally, lithium was efficiently separated from impurities in the leachate by employing lithium titanate as a selective adsorbent.