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Synthesis and Sintering Reaction Mechanism of High-Performance MgO-CaO-Fe(2)O(3) Clinker
High-performance MgO-CaO-Fe(2)O(3) clinker was prepared using magnesite from Xinjiang (with high calcium and low silica), calcium oxide, and ferric oxide as raw materials. Microstructural analysis and thermogravimetric analysis, combined with HSC chemistry 6 software simulations, were used to invest...
Autores principales: | , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10004228/ https://www.ncbi.nlm.nih.gov/pubmed/36903200 http://dx.doi.org/10.3390/ma16052086 |
Sumario: | High-performance MgO-CaO-Fe(2)O(3) clinker was prepared using magnesite from Xinjiang (with high calcium and low silica), calcium oxide, and ferric oxide as raw materials. Microstructural analysis and thermogravimetric analysis, combined with HSC chemistry 6 software simulations, were used to investigate the synthesis mechanism of MgO-CaO-Fe(2)O(3) clinker and the effect of firing temperature on the properties of MgO-CaO-Fe(2)O(3) clinker. The results show that MgO-CaO-Fe(2)O(3) clinker with a bulk density of 3.42 g·cm(−3), water absorption of 0.7%, and excellent physical properties can be formed by firing at 1600 °C for 3 h. In addition, the crushed and reformed specimens can be refired at temperatures of 1300 °C and 1600 °C to achieve compressive strengths of 17.9 MPa and 39.1 MPa, respectively. The main crystalline phase of the MgO-CaO-Fe(2)O(3) clinker is the MgO phase; the 2CaO·Fe(2)O(3) phase generated by the reaction is distributed between the MgO grains to form a cemented structure with a small quantity of 3CaO·SiO(2) and 4CaO·Al(2)O(3)·Fe(2)O(3) also distributed between the MgO grains. A series of decomposition and resynthesis chemical reactions occurred during the firing of the MgO-CaO-Fe(2)O(3) clinker, and the liquid phase appeared in the system once the firing temperature exceeded 1250 °C. The presence of the liquid phase promoted intergranular mass transfer between the MgO grains, ensuring the continuous growth of the MgO grains and furthering the densification of the MgO-CaO-Fe(2)O(3) clinker. |
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