Chemical speciation and structure of lithium (Li) in coal gasification fine slag: Evolution mechanisms and implications for Li recovery - Biao Fu; Xia Wu; Chengxiang Yu; Xinru Zhou; Hongyan Nan; Yijun Cao; Yukun Huang; Yuhang Gao; Guangqing Hu; Zhongjie Shen; Lingkun Rong (Fuel, 2026)