Study on a New Type of Composite Powder Explosion Inhibitor Used to Suppress Underground Coal Dust Explosion

Bo Liu,Kaili Xu,Yuyuan Zhang,Ning Ma,Yansong Zhang,Zheng Hao

doi:10.3390/app11188512

Abstract

At present, the world is committed to the development of environmentally friendly, sustainable and industrial safety. The effective treatment of industrial solid waste can be applied in the field of industrial safety. It is one of the ways to apply industrial solid waste to industrial safety to modify industrial solid waste and combine active powder to prepare industrial solid waste-based composite powder explosion inhibitors and apply it to underground coal dust explosion. This paper introduces the modification and preparation methods of industrial solid waste, and analyzes the good explosion suppression effect and good economic benefit of industrial solid waste-based composite powder explosion inhibitors on coal dust explosion. In this paper, four kinds of industrial solid wastes (red mud, slag, fly ash and sludge) were modified, and the modified solid waste materials with good carrier characteristics were obtained. Combined with a variety of active powders (NaHCO3, KH2PO4 and Al(OH)3), the industrial solid waste-based composite powder explosion inhibitors were obtained by solvent-crystallization (WCSC) and dry coating by ball milling (DCBM). Those kinds of explosion inhibitors can suppress the explosion of pulverized coal in 40–50% of cases. Compared with the powder explosion inhibitor commonly used in industry, it has a lower production cost and better explosion suppression effect. Those kinds of explosion inhibitors have a good industrial application prospect.

Highlights

The results show that the maximum explosion pressure (Pmax) and maximum rate of explosion pressure rise ((dp/dt)max) of the coal dust decrease under the action of an explosion inhibitor
Based on the consideration of environmental protection and the underground safety of coal mine, a preparation method of new composite powder explosion inhibitor based on industrial solid waste is proposed to suppress an underground coal dust explosion, and the explosion suppression effect of coal dust is experimentally studied
It is found that modified solid waste materials—modified red mud (MRM), modified slag (MSA), modified fly ash (MFA) and modified sludge (MSU)—as the load, NaHCO3, KH2 PO4 and Al(OH)3 as the carrier, and the industrial solid waste-based composite powder explosion inhibitors can be successfully compounded by wet coating by solvent–crystallization (WCSC) and dry coating by ball milling (DCBM)

Summary

Introduction

Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. The aforementioned four industrial solid wastes are ideal carrier materials for composite powder explosion inhibitors because of the following reasons [15,16]. Huge amounts of industrial solid wastes are generated every year and they are available at very cheap prices Four kinds of solid wastes—red mud, fly ash, slag and sludge—are studied, and a variety of new composite powder explosion inhibitors are prepared through a modification and compounding process. The feasibility of preparing an effective new composite powder explosion inhibitor from typical industrial solid waste was discussed. The preparation method of the new explosion inhibitors provides a new way for the resource of industrial solid waste to be utilized. The explosion suppression application of the new explosion inhibitors to coal dust provide a new method for the prevention of underground coal dust explosion accidents

Modification of Industrial Solid Wastes

Preparation Method

Result and Discussion

Findings

Cost of Industrial Solid Waste-Based Composite Powder Explosion Inhibitors

Conclusions