Mechanism Analysis of Cr(Ⅵ) Reduction by Coal Gangue in Acidic Wastewater

LI Yan; DOU Yafang; XIAO Wenli; CHAI Dong; Hazritiali Memet

doi:10.13779/j.cnki.issn1001-0076.2022.06.004

2022 Vol. 42, No. 6

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Article navigation > Conservation and Utilization of Mineral Resources > 2022 > 42(6): 30-35

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LI Yan, DOU Yafang, XIAO Wenli, CHAI Dong, Hazritiali Memet. Mechanism Analysis of Cr(Ⅵ) Reduction by Coal Gangue in Acidic Wastewater[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 30-35. doi: 10.13779/j.cnki.issn1001-0076.2022.06.004

Citation:

LI Yan, DOU Yafang, XIAO Wenli, CHAI Dong, Hazritiali Memet. Mechanism Analysis of Cr(Ⅵ) Reduction by Coal Gangue in Acidic Wastewater[J]. Conservation and Utilization of Mineral Resources, 2022, 42(6): 30-35. doi: 10.13779/j.cnki.issn1001-0076.2022.06.004

Mechanism Analysis of Cr(Ⅵ) Reduction by Coal Gangue in Acidic Wastewater

1.
Xinjiang Institute of Engineering, Urumqi 830023, Xinjiang, China
2.
Collaborative Innovation Center for High Value Transformation of Coal Chemical Process By-products, School of Chemical and Environmental Engineering, Xinjiang Institue of Engineering, Urumqi 830023, Xinjiang, China
3.
Key Laboratory of Bio-based Applied Materials, School of Chemical and Environmental Engineering, Xinjiang Institue of Engineering, Urumqi 830023, Xinjiang, China

Received Date: 05 August 2022

Publish Date: 26 December 2022

Abstract

Abstract

The kinetic behavior and mechanism of the reaction between coal gangue and Cr(Ⅵ) were investigated. The study showed that the reduction process of Cr(Ⅵ) by coal gangue could be divided into two stages. During the initial stage, siderite and pyrite in coal gangue reacted with hydrogen ions to generate Fe(Ⅱ), S and H₂S. Since it was a solid-liquid reaction, the reaction rate was closely related to the mass transfer rate. The reaction rate constant obtained under stirring condition was 0.169 mg/(L·min), much higher than 0.048 mg/(L·min) got under static conditions. The second stage was the reduction of Cr(Ⅵ). The results got from elemental analysis, infrared and XRD characterization showed that the iron and sulfur elements in siderite and pyrite were oxidized to Fe(Ⅲ) and SO₄²⁻, and Cr(Ⅵ) was reduced to Cr(Ⅲ) which is low toxicity . Siderite and pyrite are common components in coal gangue. According to the above research and analysis, the use of coal gangue for treating wastewater containing Cr(Ⅵ) not only improves the utilization efficiency of coal gangue, but also provides a cost-effective and efficient method for the treatment of wastewater containing Cr(Ⅵ).
- coal gangue /
- Cr(Ⅵ) /
- mechanism analysis

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References

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