Structural characteristics of separated components from high-Sulfur coking coal: Innovative research on pyrolysis sulfur migration behavior and coke quality improvement - Zhengzhi Zhang; Honglei Yan; Zhanku Li; Muxin Liu; Jingchong Yan; Weidong Zhang; Zhicai Wang; Zhiping Lei; Shibiao Ren; Hengfu Shui (Fuel, 2026)