Study on dust reduction characteristics and mechanism of softened mine water

Abstract

ABSTRACT At present, the intensity of coal mining is increasing gradually, and the concentration of coal dust in roadways under integrated mining is high, making it difficult to control. As a result, the mechanism and technology of dust reduction remain one of the key points of efficient mining research. To study the influence of physical and chemical properties of mine water on dust reduction efficiency, this work used spray dust reduction experiment system to assess dust reduction efficacy of several solutions at 3～6MPa, and the differences in the dedusting characteristics and atomization characteristics of each group of each solution were analyzed. The result demonstrates that softened mine water’s surface tension and contact angle fall significantly, spray droplet size lowers, and fog dispersion becomes more symmetrical. When compared to before softening, the dust reduction efficiency of softened water (SW) is 72.52% for total dust and 69.74% for respiratory dust, considerably improving the working environment of underground coal miners and optimizing mining efficiency.