Co-gasification of coal and coal indirect liquefaction residue (LR) could mitigate the environmental pollution caused by solid waste accumulation to a great extent. Therefore, in this work, anthracite coal and LR were co-gasified to solve the above-mentioned derived problems. The effects of LR addition on ash fusibility and fluidity were investigated by ash fusion temperature analyzer (AFTA), XRD, SEM-EDS and FactSage software. The results showed that with the increase of LR proportion, the ash fusion temperatures (AFTs) could be effectively reduced. The formation of mullite with skeleton structure was the main reason for the higher AFTs in Sihe coal ash (AS0). The addition of LR increased the Fe content in the mixed sample, thereby inhibiting the formation of mullite phase and promoting the formation of low-temperature eutectic (hercynite and fayalite) resulting in the continuous decrease of AFTs. According to the quantitative calculation of change rate of ash cone height during AFTs test, the melting mechanism was described. Due to the high AFTs of AS0, the ash melting behavior followed the “softening-melting” mechanism; however, for the sample with LR added, the ash melting behavior conformed to the “melting-dissolution” mechanism. Finally, flow temperature (FT) and T_mullite were fitted (FT = 1.35*T_mullite-336.94), and there was a good linear relationship.

煤与煤间接液化残渣（LR）的联合气化可以在很大程度上减轻固体废物堆积造成的环境污染。因此，在这项工作中，无烟煤和LR共气化以解决上述衍生问题。通过灰熔温度分析仪(AFTA)、XRD、SEM-EDS和FactSage软件研究了LR添加对灰熔性和流动性的影响。结果表明，随着LR比例的增加，灰熔温度(AFTs)可以有效降低。具有骨架结构的莫来石的形成是四河煤灰(AS0)中AFTs较高的主要原因。LR的加入增加了混合样品中的Fe含量，从而抑制莫来石相的形成，促进低温共晶（海长石和铁橄榄石）的形成，导致AFTs不断降低。根据AFTs试验过程中灰锥高度变化率的定量计算，描述了熔化机理。由于AS0的高AFT，灰分熔化行为遵循“软化-熔化”机制；然而，对于添加LR的样品，灰分熔化行为符合“熔化-溶解”机制。最后，流动温度 (FT) 和 T 对于添加LR的样品，灰分熔化行为符合“熔化-溶解”机制。最后，流动温度 (FT) 和 T 对于添加LR的样品，灰分熔化行为符合“熔化-溶解”机制。最后，流动温度 (FT) 和 T_莫来石拟合（FT  =  1.35*T_莫来石-336.94），具有良好的线性关系。