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Evaluation for the Leaching of Cr from Coal Gangue Using Expansive Soils

1
College of Energy and Transportation Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China
2
Department of Civil & Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
*
Author to whom correspondence should be addressed.
Processes 2019, 7(8), 478; https://doi.org/10.3390/pr7080478
Received: 1 June 2019 / Revised: 15 July 2019 / Accepted: 21 July 2019 / Published: 24 July 2019
(This article belongs to the Section Other Topics)
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Abstract

Coal gangue can cause significant heavy metal pollution in mining areas, which would have a negative impact on the environment and human health. The objective of this research is to investigate the relationship between expansive soil amount and the leaching behavior of Chromium from coal gangue and the engineering properties of coal gangue used as building materials. The leaching behavior of Chromium from coal gangue was observed using atomic absorption spectrometry. A column leaching experiment was conducted to examine the impact of leaching time and heavy metal concentration. Furthermore, the unconfined compressive strength test was employed to evaluate the engineering properties of coal gangue with expansive soil. The results of the study demonstrate that pH of leachate solutions, leaching time, and expansive soil amounts in mixtures have important influence on Chromium concentration. The leachate solutions, which behave like alkaline, provide a positive environment for adsorbing Cr. Adding expansive soil can reduce leached concentrations of Chromium from coal gangue when compared to leachate of original coal gangue. It was found that 30% expansive soil was an improved solution because it delayed the cumulative concentration to reach the limitation line. Moreover, the unconfined compressive strength of coal gangue was boosted through adding expansive soil. View Full-Text
Keywords: coal gangue; expansive soil; leaching; heavy metal; unconfined compressive strength coal gangue; expansive soil; leaching; heavy metal; unconfined compressive strength
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Zhang, Y.; Baaj, H.; Zhao, R. Evaluation for the Leaching of Cr from Coal Gangue Using Expansive Soils. Processes 2019, 7, 478.

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