Synthesis and performance measurement of environment-friendly solidified dust suppressant for open pit coalmine

摘要

In this work, a new type of environment-friendly solidified dust suppressant was developed to solve the dust pollution problem in open pit coalmines, coal bunkers, and so on. Natural polymer chitosan with excellent properties was chemically modified. Infrared spectroscopy was adopted to characterize the product. Using substitution rate as the evaluating indicator, the optimized mass ratio between monomer 3-chloro-2-hydroxypropyl trimethyl ammonium chloride and chitosan, reaction temperature, reaction time, and pH were determined via single factor experiments. Combining the results of the four-factor-four-level orthogonal experiment, the optimum reaction conditions A(2)B(3)C(4)D(3) were obtained. The hardened film on the surface of coal powders was observed by high-resolution scanning electron microscope. In addition, the water retention, solidification performance, and wind erosion resistance of the dust suppressant, as well as its influence on coal properties were measured. The results show that the synthesized dust suppressant demonstrates excellent properties and has good dust suppression effect. (c) 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 46505.