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Título: Analyzing the Role of Fe0 and Fe3+ in the Formation of Expanded Clay Aggregates
Autoría: Moreno-Maroto, González-Corrochano, B. J.M.
Martínez-Rodríguez, Conde-Sánchez, A.
Cobo-Ceacero, Alonso-Azcárate, J. C.J.
Uceda-Rodríguez, López García, A.B. M.
Martínez-García, Cotes-Palomino, T C.
Resumen: The effect of the addition of Fe0 and Fe3+ on the formation of expanded clay aggregates was studied using iron-free kaolin as an aluminosilicates source. Likewise, the incorporation of cork powder as a source of organic carbon and Na2CO3 as a flux in the mixtures was investigated in order to assess its effect in combination with the iron phases. An experimental protocol, statistically supported by a mixture experiments/design of experiments approach, was applied to model and optimize the bloating index, density, absorption capacity, and mechanical strength. The process of expansion and pore generation and the associated decrease in density required the addition of iron, such that the optimum mixtures of these properties presented between 25 and 40 wt.% of Fe0 or Fe3+, as well as the incorporation of 3.5–5 wt.% of organic carbon. The addition of Fe3+ produced a greater volumetric expansion (max. 53%) than Fe0 (max. 8%), suggesting that the formation of the FeO leading to this phenomenon would require reducing and oxidizing conditions in the former and the latter, respectively. The experimental and model-estimated results are in good agreement, especially in the aggregates containing Fe0. This reinforces the application of statistical methods for future investigations.
Palabras clave: expanded clay aggregate
organic carbon
sodium carbonate
design of experiments
Fecha: 14-ago-2023
Patrocinador: Many thanks for Mark Tyrer (https://orcid.org/0000-0003-3327-895X, accessed on 20 June 2023) that help us to improve the english for our research work. This research was conducted as a part of the ECO-MET-AL Project, PID2019-109520RB-I00/AEI/10.13039/501100011033, “Can industrial and mining metalliferous wastes produce green lightweight aggregates? Applying the Circular Economy” funded by the Spanish Ministry of Science, Innovation and Universities and ERDF funds, framed in the “Ayudas a “Proyectos I+D+i” en el marco de los Programas Estatales de Generación de Conocimiento y Fortalecimiento Científico y Tecnológico del Sistema de I+D+i y de I+D+i orientada a los Retos de la Sociedad, Convocatoria 2019”. We also wish to thank the SCAI of the University of Jaén, the University of Castilla-La Mancha and the University of Málaga for their services.
Editorial: MPDI
Citación: Moreno-Maroto, J.M.; González-Corrochano, B.; Martínez-Rodríguez, A.M.; Conde-Sánchez, A.; Cobo-Ceacero, C.J.; Alonso-Azcárate, J.; Uceda-Rodríguez, M.; López, A.B.; Martínez-García, C.; Cotes-Palomino, T. Analyzing the Role of Fe0 and Fe3+ in the Formation of Expanded Clay Aggregates. Materials 2023, 16, 5623. https://doi.org/10.3390/ma16165623
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