Abstract
The acid mine drainage (AMD) and coal dust from coal mining cause erosion to the ecological environment. Herein, a combined electrodialysis (ED) and coal dust suppression system is developed to realize AMD resource utilization and coal dust suppression. In the ED, >97% removal rate of Fe3+, Zn2+, Cu2+, and Ni2+ were obtained. Metal ions coordination among acrylic acid (AA), ammonium persulfate (APS), and concentrated AMD have been utilized to prepare an interpenetrating network hydrogel dust suppressant (ED-AMD-PAA). Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) demonstrated that metal ions of concentrated AMD coordination in polyacrylic acid (PAA) based hydrogels. The mass of ED-AMD-PAA remains relatively stable at 175 °C by thermogravimetric analysis. The compressive strength of the solidified coal dust by mixed ED-AMD-PAA dust suppressant reached 247.44 ± 34.45 KPa, the mass loss of coal dust consolidation was only 0.05 ± 0.02 g after the wind resistance test, and ED-AMD-PAA still preserved about 2.4 ± 0.17% moisture after 48 h. The degradation rate of ED-AMD-PAA dust suppressant in the soil reached 37.4 ± 1.43% on the 10th cycle. Those results will help the engineering application of PAA in coal dust suppression and AMD resource utilization.
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