Study on the Effect of Mechanical Activation on the Combustion Characteristics of Coal Gasification Fine Slag

In this article, the particle size of the original coal gasification fine slag (CGFS) sample is mechanically ground to less than 40 microns by mechanical activation. The traditional alkali washing and acid washing pretreatment technology improved by microwave heating method is used to further treat the mechanically activated samples, and three experimental samples were obtained. Mechanical activation sample CGFS‐A, alkali washing sample CGFS‐B and acid washing sample CGFS‐C. The kinetic parameters such as activation energy (E) and pre‐exponential factor (A) are calculated by thermogravimetric analysis and Cotes‐Redfern model to analyze the combustion process. The results show that the mechanically activated sample CGFS‐A has the highest flammability index (c) and comprehensive combustion characteristic index (s), indicating that its comprehensive combustion performance is the best. In this article, through the comparative analysis of the three samples, it is concluded that acid washing and alkali washing remove more than 95% of the metal oxides, resulting in a significant reduction in the combustion catalyst in the CGFS combustion reaction. Therefore, simple mechanical activation can better improve the combustion performance of CGFS.