Abstract
The preparation of high-strength phosphogypsum aggregates (HPA) was explored in this study by the compaction–fragmentation–grinding–hydration process from mixture of PG GGBS OPC dry powders. The dry powder blocks were first produced by compaction using the programed pressure and then was crushed into small pieces with angular shapes. The small pieces were grinded and then sprayed with saturated lime water. Hydration occurs in water-sprayed pieces, and the high-strength phosphogypsum aggregates (HPA) was produced after 28 days curing. The apparent density and cylinder compression strength of the HPA in drying state were up to 2010 kg/m3 and 23.58 MPa, respectively. These results indicated that the rehydration process after compaction can make the prepared HPA obtain high density and strength, solving the shortcoming of the high-doped phosphogypsum products with low strength. Investigating phosphorus and fluoride pollutants in HPA showed that they met the requirements of water with Class I. Finally, the microscopic analysis of XRD and SEM identified that the phase type of the HPA were CaSO4 and ettringite. The changes in the internal pores of the HPA in the curing process were explored by mercury intrusion porosimetry and the results further verified the HPA is well compacted.
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Acknowledgements
The authors would like to acknowledge the financial support received from Open Research Fund of Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, Ministry of Education, Grant (Nos. KF2022-12 and KF2023-05) ,National Natural Science Foundation of China (No. 52209136), National Natural Science Foundation of China (No. 52279102),Changjiang River Academy of Sciences 2021 Open Research Fund (No. CKWV2021871/KY) and Hubei Three Gorges Laboratory Open Fund (No. SK211003).
Funding
Changjiang River Scientific Research Institute, No. CKWV2021871/KY, Yunzhi Tan, National Natural Science Foundation of China, NO.52209136,Jun Wu, NO.5227102, Yunzhi Tan, China Three Gorges Laboratory Open Fund, No. SK211003, Yunzhi Tan, Engineering Research Center of Eco-environment in Three Gorges Reservoir Region, NO.KF2022-12, Huajun Ming
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ZS: investigation, formal analysis, writing–original draft. YT: conceptualization, funding acquisition, resources, supervision, writing–review and editing. HM: methodology and supervision. HL: writing–review and editing. JW: funding acquisition, writing–review and editing. CW: resources. BH: resources.
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Tan, Y., Song, Z., Ming, H. et al. Preparation and performance evaluation of high-strength phosphogypsum aggregates by compaction and hydration. J Mater Cycles Waste Manag 26, 149–161 (2024). https://doi.org/10.1007/s10163-023-01811-8
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DOI: https://doi.org/10.1007/s10163-023-01811-8