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The ash‐related issues hinder the safe utilization of Zhundong coal, closely relevant to its ash compositions. Previous studies mainly focused on the experimental methods and the selection of ash composition benchmark was restricted to a specific coal sample with limited element types, ignoring the comprehensive elemental interaction. Here, the impacts of eight compositions on ash fusion and crystal phase transformation behaviors were taken into consideration. Moreover, FactSage software was employed to further elucidate the transformation mechanism of ash composition with the increasing temperature. The results showed that the refractory forsterite and merwinite disappeared but more magnesioferrite was present with an increase in ferric oxide content, resulting in the decrease of ash fusion temperatures. The refractory substances, such as forsterite, perovskite, periclase, and larnite, occurred successively with the increasing ratio of basic oxide to acid oxide. The slag content had reached its maximum at 1200°C, up to 90% as the content of CaO was 16%, which was corresponding to that the flowing temperature descended to the lowest point around 1200°C with 16% CaO. With the rising temperature, more slag appeared and the composition species declined, related with the generation of fusible compounds containing Fe and Na at high temperature. The present work can play a guiding role in safe and clean use of Zhundong coal.

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