Powder Explosion Inhibitor Prepared from Waste Incinerator Slag: Applied to Explosion Suppression of Oil Shale Dust Explosion

Bo Liu,Yuyuan Zhang,Ji Ge,Kaili Xu

doi:10.3390/app12031034

Abstract

In this paper, a method for waste incineration slag is proposed. An incineration acidification alkalization modification was carried out based on the characteristics of the oxides (SiO2, CaO, Al2O3, Fe2O3, and MgO) of waste incineration slag. With modified slag as the carrier and NaHCO3 as the supporter, a slag-based composite powder explosion inhibitor was prepared with the solvent-crystallization wet coating (WCSC), ball milling dry coating (DCBM), and air impact dry coating (DCAI) methods. The advantages and disadvantages of the three methods were compared and analyzed. Explosion suppression experiments on oil shale dust were carried out, and the explosion suppression mechanism was described. The explosion suppression process of the modified slag–NaHCO3 composite powder explosion inhibitor for oil shale dust was found to involve a synergy of physical and chemical inhibition. This explosion suppression mechanism indicates three requirements for the preparation and application of industrial solid waste-based composite powder explosion inhibitors. The feasibility of preparing composite powder explosion inhibitors from waste incinerator slag was discussed from the experimental point of view and its explosion suppression performance on oil shale dust was studied with the intention of providing a new form of resource utilization for waste incinerator slag.

Highlights

A large amount of industrial solid waste (ISW) is produced in the process of industrialization
This paper is focused on the resource utilization of waste incinerator slag through the preparation of ISW-based composite powder explosion inhibitors and use of them to prevent explosion accidents of mineral dust in the process of industrial production
This study provides a new idea and method for recycling waste incinerator slag and dust explosion suppression techniques

Summary

Introduction

A large amount of industrial solid waste (ISW) is produced in the process of industrialization. Some ISW can be used as resources. The resource utilization of solid waste can increase the added value of industrial production, as well as serve the safety of industrial production. Utilizing the resources of ISW and transforming solid waste into economic and safety benefits have remained topics of concern for scientists. This paper is focused on the resource utilization of waste incinerator slag through the preparation of ISW-based composite powder explosion inhibitors and use of them to prevent explosion accidents of mineral dust in the process of industrial production. A kind of ISW generated from waste incineration, is a renewable and reusable resource. Waste incinerator slag has been extensively studied throughout the world with respect to its potential use as, e.g., a substitute aggregate for concrete, a raw material for cement, a cover material for landfills, and for making brick or ceramics [1,2]

Methods

Results

Conclusion