## 1 Introduction  
Continued industrialization has brought along increased emissions of industrial solid wastes. Conventional land-based stockpiling and landfill not only contaminate land and water sources, but also compromise people's health. In the resource utilization of industrial solid wastes, few people have given it a consideration that industrial solid wastes can be used as a raw material to make new construction material or other materials [1, 2, 3]. Thus far, bulk industrial solid wastes are treated primarily by incineration and secondarily by solidification-landfill [4]. While incineration and solidification-landfill can deal with large volumes of industrial solid wastes, as incineration produces toxic and green gases, it leads to even worse air pollution problems; solidification-landfill is also harmful to groundwater resources by generating large amounts of leachate. In fact, most industrial solid wastes can be reused as resources through chemical, physical or biological modification to remove the toxic contents or neutralize the pH value [5, 6, 7]. Studies on the reuse of red mud resources are mostly concentrated on extracting ferro-aluminum contents or using it as a catalyst or to synthesize new materials. [PERSON] et al. [8]tried to remove the SO\({}_{2}\) and NO\({}_{\rm x}\) in industrial flue gas simultaneously using red mud as the absorbent together with O\({}_{3}\). [PERSON] et al. [9] used dealuminized red mud and fly ash to prepare composite flocculant for treating diatomic simulated wastewater. The explosion inhibitor made from red mud is mostly used in the experimental study of gas explosion suppression. [PERSON] et al. [10] modified red mud to obtain an ultrafine modified red mud powder explosion inhibitor, which has good performance in a gas explosion suppression experiment. [PERSON] et al. [11] used urea and fly ash to synthesize a core-shell composite powder explosion inhibitor, which has better effect on a coal dust explosion than fly ash and urea. [PERSON] et al. [12] used municipal solid waste incineration (MSWI) products--fly ash (FA) and bottom ash (BA)--together with sodium silicate or sodium hydroxide to prepare the three new types of slurry, respectively. Mechanical testing proved that all three pastes provide a mechanical property qualifying for engineering application. [PERSON] et al. [13] used MSWI-FA as the carrier of immobilization. It is feasible to cotreat the ferronickel slag (FNS) using geopolymer technology. [PERSON]. [14] studied the feasibility of lime-stabilized sludge as a building material for a flexible pavement subbase. Through a comprehensive study of the literature on the utilization of industrial solid waste, it is found that there are relatively few studies on the use of industrial solid waste as an explosion inhibitor, and there are many applications in the prevention of gas explosion, and there is a lack of application research on coal dust explosion in underground coal mines. The aforementioned four industrial solid wastes are ideal carrier materials for composite powder explosion inhibitors because of the following reasons [15; 16]. First, the output of solid waste is large and the cost is low. Huge amounts of industrial solid wastes are generated every year and they are available at very cheap prices. Second, they contain explosion suppression components. The main components of the four solid wastes are SiO\({}_{2}\), CaO, Al\({}_{2}\)O\({}_{3}\), Fe\({}_{2}\)O\({}_{3}\), MgO and Na\({}_{2}\)O. Various components are inert powder and have the ability to suppress an explosion. In addition, the Al\({}_{2}\)O\({}_{3}\) and Fe\({}_{2}\)O\({}_{3}\) oxides contained in solid waste can be converted into metal hydroxide Al(OH)\({}_{3}\) and Fe(OH)\({}_{3}\) with certain explosion inhibition activity [17]. Third, they contain a lot of micropore structures. The abundant pore structures allow the industrial solid wastes to carry other active supporters and realize the synergistic explosion suppression effect of solid waste and active explosion suppression powder.