The data of the article “Integrated Roasting–Alkali Leaching–Adsorption Strategy for Highly Efficient Lithium Extraction from Coal Fly Ash”

However, con-ventional methods for lithium extraction from CFA are constrained by efficiency and selectivity, owing to the low grade of lithium and its encapsulation within a chemically stable glass phase. To overcome this technical bottleneck, this study proposes a novel multi-stage lithium extraction strategy integrating "activation roasting–mild alkaline leaching–adsorption separation." First, CFA was mixed with sodium sulfate and roasted at 900 ℃ for 2 h.

This high-temperature roasting effectively disrupted the Si–O–Al bonds within the glass phase, inducing lattice recon-struction and enabling the thermal activation of lithium and its host minerals. Subsequently, the calcine underwent mild alkaline leaching (1 mol·L-1 NaOH, 70 ℃, liquid-to-solid ratio of 5:1) to achieve the selective release of lithium ions. Finally, a lithium titanate ion sieve, known for its specific memory effect towards lithium, was employed for adsorption, accomplishing the highly efficient and specific separation of lithium from impurities.