Water-retaining properties of NCZ composite dust suppressant and its wetting ability to hydrophobic coal dust

International Journal of Coal Science & Technology

Jingge Xu¹  Zihao Zhou¹  Tianyang Wang¹  Longzhe Jin²  Jianguo Liu²  Shu Wang² 

[1]School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, Beijing, China

[2]School of Civil and Resource Engineering, University of Science and Technology Beijing, 100083, Beijing, China

[3]Key Laboratory of High-Efficient Mining and Safety of Metal Mines of the Ministry of Education, University of Science and Technology Beijing, 100083, Beijing, China

[4]Mine Emergency Technology Research Center, University of Science and Technology Beijing, 100083, Beijing, China

关键词: Coal dust;    Hydrophobicity;    Dust suppressant;    Wettability;    Water retention;   

DOI  :  10.1007/s40789-020-00385-2

来源: Springer

【 摘 要 】

Coal dust is a primary threat to underground coal miners. The most common approach to control coal dust is hydraulic methods, such as water spray and coal seam water injection. To improve the dust suppressant efficiency of hydraulic methods, a novel chemical composite dust suppressant, called NCZ, was prepared in this study using calcium chloride (CaCl2), magnesium chloride (MgCl2), and nonionic surfactants using a thermal synthesis method. The water-retaining properties of NCZ powder and its solutions were characterized using the water absorption rate (WAR) and evaporation rate (ER), respectively, and the wetting abilities of the NCZ solutions on coal dust were tested using the initial contact angle (ICA) and sink rate (SR). The results indicate that the NCZ solutions have anti-evaporation effects, and the ER of the solution with a 20.0 wt% NCZ is reduced by 11.7% compared with that of clean water. Furthermore, NCZ solutions have remarkable enhancement effects on the wettability of coal dust. The ICA and SR of clean water and the NCZ solution at 20.0 wt% are 141.9° and 0 mg/s, and 29.3° and 1.46 mg/s, respectively. Finally, quantitative relationships between the solution surface tension and the ICA and IR were established using the least squares method. This study provides a new product for dust suppression in underground mines, which is significant for the optimum applied concentration of dust suppressant in mining operations.

【 授权许可】

CC BY