Development of phosphate mine waste-based geopolymer by mechanosynthesis
This study explores the valorization of phosphate mine by-product—an abundant aluminosilicate-rich waste—through the synthesis of geopolymers using the mechanosynthesis method. While mechanosynthesis has been applied in geopolymer research, this work is the first to employ it by using the phosphate...
| Autores: | , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/405643 |
| Acceso en línea: | http://hdl.handle.net/10261/405643 |
| Access Level: | acceso abierto |
| Palabra clave: | Phosphate mine waste Mechanosynthesis Geopolymer 29Si 27Al MAS NMR |
| Sumario: | This study explores the valorization of phosphate mine by-product—an abundant aluminosilicate-rich waste—through the synthesis of geopolymers using the mechanosynthesis method. While mechanosynthesis has been applied in geopolymer research, this work is the first to employ it by using the phosphate mine waste as a precursor. The geopolymer samples produced by mechanosynthesis (GPMS) were compared with conventionally prepared geopolymer pastes (GPC) to assess their microstructural and mechanical properties. Geopolymer powders (PGP) were prepared by milling a solid blend of phosphate mine waste (YC) and alkaline activators. The YC/alkaline activator ratios were (1.5 and 2.5), Na2SiO3/NaOH mass ratios were (1.5, 2.5 and 3.5) and milling times of 10 and 20 min. The obtained GP-P, GP-C and GP-MS were characterized by X-ray diffraction (XRD), Magic-Angle Spinning Nuclear Magnetic Resonance Spectroscopy (29Si and 27Al MAS NMR), particle size distribution and compressive strengths. Milling the raw materials resulted in the development of new crystalline structures. Additionally, the mechanosynthesis process improved the reactivity of the YC, which was evidenced by the observed increase in compressive strength 45 % for mix1 and 26 % for mix2. |
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