Abstract
Cationic release, surface microstructure, and pore size distribution of coal gangue during the acid-based chemical solution corrosion were investigated. Results showed that during the interactions of gangue and chemical solution, the acidity and alkalinity of mixed solutions first decrease quickly, and then stabilize. The concentrations of released Ca, Mg, and Fe in gangue decrease with the decreasing acidity of the chemical solution, and produce a trend of increase-to-decrease with the increase in alkalinity. The release of Ca, Mg, and Fe is significantly influenced by the weathering of gangue. Ca and Mg achieve a concentrated release during the first day, whereas the release of Fe occurs gradually within the first 10 days. The microstructure detection result indicates that the surface structure of fresh gangue is exposed to obvious corrosion by acid-based chemical solutions, with higher extent of corrosion in acidic solution than that in alkaline solution. The micropore is relatively developed, and the secondary and middle pores increase gradually. The specific surface area is increased. Furthermore, the pore size distribution of abundance of micropore and middle pore shows a series of inconsistent spectra instead of a continuous wide-flat spectrum.
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Acknowledgments
This research was supported by the National Basic Research Program of China (973 Program) (2012CB719802); the National Natural Science Foundation of China (51279199, 50927904, 5079143); the National Water Pollution Control and Management Science and Technology Major Projects of China (2012ZX07104-002); Wuhan high and new technology achievements transformation and industrialization project (2013060803010403).
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Xue, Q., Lu, H., Zhao, Y. et al. The metal ions release and microstructure of coal gangue corroded by acid-based chemical solution. Environ Earth Sci 71, 3235–3244 (2014). https://doi.org/10.1007/s12665-013-2743-y
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DOI: https://doi.org/10.1007/s12665-013-2743-y