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.

煤尘是对地下煤矿工人的主要威胁。控制煤尘的最常用方法是水力方法，例如喷水和煤层注水。为了提高液压方法的粉尘抑制效率，本研究使用热合成方法，使用氯化钙（CaCl ₂），氯化镁（MgCl ₂）和非离子表面活性剂制备了一种新型的化学复合粉尘抑制剂，称为NCZ 。用吸水率（WAR）和蒸发率（ER）表征了NCZ粉末及其溶液的保水性能，并用初始接触角（ICA）测试了NCZ溶液在煤尘上的润湿能力。 ）和下沉率（SR）。结果表明，NCZ溶液具有抗蒸发作用，与清洁水相比，具有20.0 wt％NCZ的溶液的ER降低了11.7％。此外，NCZ解决方案对煤粉的润湿性具有显着的增强作用。20.0 wt％的净水和NCZ溶液的ICA和SR分别为141.9°和0 mg / s，以及29.3°和1.46 mg / s。最后，使用最小二乘法建立溶液表面张力与ICA和IR之间的定量关系。这项研究为地下矿井中的粉尘抑制提供了一种新产品，这对于在采矿作业中最佳使用粉尘抑制剂的浓度具有重要意义。