Controlled sintering for cadmium stabilization by beneficially using the dredged river sediment

Highlight

● Dredged river sediment was proved as a ceramic precursor rather than a solid waste.

● Cd was stabilized in Cd-Al-Si-O phases at low temperatures via sediment addition.

● < 5% of Cd was leached out from sintered products even after a prolonged time.

● A strategy was proposed to simultaneously reuse wastes and stabilize heavy metals.

Abstract

Cd-bearing solid wastes are considered to be a serious threat to the environment, and effective strategies for their treatment are urgently needed. Ceramic sintering has been considered as a promising method for efficiently incorporating heavy metal-containing solid wastes into various ceramic products. Mineral-rich dredged river sediment, especially Al and Si-containing oxides, can be treated as alternative ceramic precursors rather than being disposed of as solid wastes. To examine the feasibility of using waste sediment for Cd stabilization and the phase transition mechanisms, this study conducted a sintering scheme for the mixtures of CdO and dredged river sediment with different (Al+Si):Cd mole ratios. Detailed investigations have been performed on phases transformation, Cd incorporation mechanisms, elemental distribution, and leaching behaviors of the sintered products. Results showed that Cd incorporation and transformation in the sintered products were influenced by the mole ratio of (Al+Si):Cd. Among the high-Cd series ((Al+Si):Cd = 6:1), CdSiO₃, Cd₂SiO₄, CdAl₂(SiO₄)₂ and Cd₂Al₂Si₂O₉ were predominant Cd-containing product phases, while Cd₂Al₂Si₂O₉ was replaced by CdAl₄O₇ when the mole ratio of (Al+Si):Cd was 12:1 (low-Cd series). Cd was efficiently stabilized in both reaction series after being sintered at ≥ 900 °C, with < 5% leached ratio even after a prolonged leaching time, indicating excellent long-term Cd stabilization. This study demonstrated that both Cd-containing phases and the amorphous Al-/Si-containing matrices all played critical roles in Cd stabilization. A promising strategy can be proposed to simultaneously reuse the solid waste as ceramic precursors and stabilize heavy metals in the ceramic products.

Keywords

Dredged river sediments / Cadmium / Sintering / Stabilization / Leaching

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2018YFC1902904), the National Natural Science Foundation of China (Nos. 21707063 and 41977329), the Research Grants Council of Hong Kong (China) (Project T21-771/16R), and Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control (China) (No. 2017B030301012). The authors are sincerely grateful for the assistance of SUSTech Core Research Facilities (China).

Electronic Supporting Information

Supporting information is available in the online version of this article at https://doi.org/10.1007/s11783-023-1661-9 and is accessible for authorized users.

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