Abstract The increasing discharge of high-salinity industrial wastewater poses serious environmental and resource challenges, necessitating innovative utilization approaches. In this study, high-salt wastewater containing Na + and Ca 2+ ions was employed to prepare coal water slurry (CWS), and its slurrying behavior, stability, and co-combustion characteristics were systematically investigated. Thermogravimetric (TG-DTG) analysis was used to explore combustion performance and reaction kinetics, revealing that elevated salt concentrations weaken slurry stability through double-layer compression but simultaneously enhance combustion reactivity. NaCl promotes combustion throughout all stages, while CaCl 2 mainly acts in the middle and later stages due to its stronger polarization and catalytic effects. These findings provide valuable insights into the physicochemical mechanisms governing salt ion-coal interactions and demonstrate the feasibility of harmless and resource-efficient utilization of high-salt concentrated wastewater. The study offers a practical pathway for achieving clean coal utilization and wastewater resource recovery.
Duan et al. (Thu,) studied this question.