Open Access

ARTICLE

Study on the Treatment of Acid Mine Drainage Containing Fe²⁺ and Mn²⁺ Using Modified Spontaneous Combustion Gangue

by Xuying Guo, Saiou Fu, Junzhen Di, Yanrong Dong, Guoliang Jiang

1 College of Mining, Liaoning Technical University, Fuxin, 123000, China
2 College of Science, Liaoning Technical University, Fuxin, 123000, China
3 College of Civil Engineering, Liaoning Technical University, Fuxin, 123000, China

* Corresponding Author: Xuying Guo. Email:

Journal of Renewable Materials 2021, 9(3), 541-555. https://doi.org/10.32604/jrm.2021.012335

Received 26 June 2020; Accepted 26 August 2020; Issue published 14 January 2021

Abstract

The high concentrations of Fe²⁺ and Mn²⁺ in acid mine drainage make it difficult and expensive to treat. It is urgent that we find a cheap and efficient adsorption material to treat Fe²⁺ and Mn²⁺. As a solid waste in mining areas, coal gangue occupies a large area and pollutes the surrounding environment during the stacking process. Developing a method of resource utilization is thus a research hotspot. In this study, we modified spontaneous combustion gangue using NaOH, NaCl, and HCl by chemically modifying the minerals. We determined the optimal conditions for treating Fe²⁺ and Mn²⁺ in acid mine drainage with spontaneous combustion gangue and modified coal gangue using the single factor test method. Based on results of the static test, two dynamic test columns, column No. 1 (spontaneous combustion gangue) and column No. 2 (NaOH modified spontaneous combustion gangue), were constructed, and the repair effects of acid mine drainage were compared and analyzed using dynamic experiments. The results show that overall, NaOH modified spontaneous combustion gangue is the most efficient at removing the Fe²⁺ and Mn²⁺ in acid mine drainage. The optimal conditions for NaOH modification are an NaOH concentration of 3 mol/L, a liquid to solid ratio of 2 L/kg, and a modification time of 8 h. The overall efficiency of column No. 2 at removing Fe²⁺ and Mn²⁺ from acid mine drainage is better than that of column No. 1. Among them, the average removal efficiency of Fe²⁺ and Mn²⁺ from acid mine drainage in column No. 2 were 97.73% and 44.82%, respectively. The above results show that NaOH modified spontaneous combustion gangue is a good adsorbent, which has application potential in wastewater remediation, as it can achieve the purpose of “treating dust with waste”.

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