Abstract
Electroplating sludge is a water purification waste containing multiple valuable metals which demand recycling with efficiency mostly associated with its thermal behavior. In this study, the thermal stability of a typical chromium-rich electroplating sludge (CRES) was assessed based on the analyses of thermogravimetric and differential scanning calorimetry, X-ray diffraction, Fourier transform infrared spectrometry, scanning electron microscopy, and electron probe micro-analysis, with a focus on phase transformations of chromium, iron, and sulfur-bearing components in the sludge within the temperature range up to 1600 °C. The results showed that the thermal stability of CRES in the temperature range could be divided into five stages. Initially, CRES had rapid mass loss below 450 °C (mostly from 196 to 393 °C), accompanied by the dehydration of metal hydroxides (CrO(OH), Fe(OH)2, and Fe(OH)3) to produce corresponding oxides, namely Cr2O3 (eskolaite), Fe3O4 (magnetite), Fe2O3 (hematite), and oxidation of CaSO3 to CaSO4 and partial Fe3O4 to Fe2O3. From 450 to 1000 °C, it remained relatively stable, with continuous minor oxidation of Fe3O4. Between 1000 and 1400 °C, CaSO4 decomposed. In the temperature range from 1400 to 1500 °C, there were decomposition of Fe2O3 and formation of (Fe,Mg)(Cr,Fe)2O4. When the temperature further increased to 1600 °C, partial replacement of Cr3+ by Fe3+ in Cr2O3 was identified.
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Abbreviations
- CRES:
-
Chromium-rich electroplating sludge
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Acknowledgements
This work was partially supported by the National Natural Science Foundation of China under Grant 52111530046, the Natural Science Fund for Distinguished Young Scholars of Hunan Province, China under Grant 2023JJ10073, and the Science and Technology Planning Project of Hunan Province, China under Grant 2019RS2008.
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Zhang, J., Peng, Z., Tian, R. et al. Assessment of thermal stability of chromium-rich electroplating sludge. J Therm Anal Calorim 148, 10335–10344 (2023). https://doi.org/10.1007/s10973-023-12400-0
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DOI: https://doi.org/10.1007/s10973-023-12400-0