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Preparation of MgCr2O4 from waste tannery solution and effect of sulfate, chloride, and calcium on leachability of chromium

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Abstract

This paper presents a study regarding the preparation of MgCr2O4 from waste tannery solution, and chromium leaching behavior is also investigated with varying amounts of sulfate, chloride and calcium. The phase transformation, crystallinity index and crystallite diameter were characterized using XRD, FT-IR and thermal analysis. A well-crystallized MgCr2O4 was successfully prepared at 1400 °C. The sintering temperature had a major impact on the formation of MgCr2O4 compared with sintering time. The MgCr2O4 phase was observed initially at 400 °C and its crystallite diameter increased with increasing temperature. The concentration of total chromium leached and Cr(VI) decreased gradually with increasing temperature. The considerable amount of Cr(VI) was found in the leachate at 300–500 °C caused by Cr(VI) intermediary products. Sulfate and chlorine could impact the transformation efficiency of chromium adversely, and chlorine has a more significant effect than sulfate. The presence of calcium disturbed the formation of MgCr2O4 and new chromium species (CaCrO4) appeared, which resulted in a sharp increase in the concentration of leached Cr(VI). Incorporating Cr(III) into the MgCr2O4 spinel for reusable products reduced its mobility significantly. This was demonstrated to be a promising strategy for the disposal of chromium containing waste resource.

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Acknowledgments

The authors gracefully acknowledge financial supports from the Foundation of State Key Laboratory of Pollution Control and Resource Reuse of China, the Natural Science Foundation of China (No. 51308282), Jiangsu science and technology support program social development project (No. BE2013703), and the Research Projects on Environmental Protection of Jiangsu Province (2013008).

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Authors and Affiliations

  1. State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, HanKou Road 9, Nanjing, China

    Linqiang Mao, Hao Cui, Chenchen Miao, Hao An, Jianping Zhai & Qin Li

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  1. Linqiang Mao
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  2. Hao Cui
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  3. Chenchen Miao
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  4. Hao An
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Correspondence to Qin Li.

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Mao, L., Cui, H., Miao, C. et al. Preparation of MgCr2O4 from waste tannery solution and effect of sulfate, chloride, and calcium on leachability of chromium. J Mater Cycles Waste Manag 18, 573–581 (2016). https://doi.org/10.1007/s10163-015-0354-2

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  • DOI: https://doi.org/10.1007/s10163-015-0354-2

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