Improved hydration resistance of MgO–2CaO·SiO2–3CaO·SiO2 composite refractory using low-grade minerals
| Autor: | Zhan Xuewu, Cui Xinghui, Wang Shijie, Ma Chengliang, Wu Xiaopeng, Wei Meng, Xiangchong Zhong, Xing Yiqiang, Fei Zhao |
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| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Oxide minerals Materials science Polymers and Plastics Dolomite Metals and Alloys Carbonate minerals Microstructure Surfaces Coatings and Films Electronic Optical and Magnetic Materials Biomaterials chemistry.chemical_compound chemistry Chemical engineering Calcium silicate Calcium Compounds Compounds of carbon Refractory (planetary science) |
| Zdroj: | Materials Research Express. 7:085502 |
| ISSN: | 2053-1591 |
| DOI: | 10.1088/2053-1591/abad52 |
| Popis: | Three low-grade mineral raw materials, i.e., natural dolomite, high-silicon magnesite, and forsterite tailings were used to prepare a MgO–2CaO·SiO2–3CaO·SiO2 composite refractory, and its hydration resistance was essentially improved. Free CaO was converted into more stable calcium silicate which protected MgO from hydration, and low melting phases formed by impurities promoted densification. The composite refractory, predominantly composed of MgO, β-2CaO·SiO2, and 3CaO·SiO2 with a bulk density of 3.13 g cm−3 and apparent porosity of 4.6%, was obtained after being calcined at 1600 °C for 3 h. The prepared composite exhibited excellent hydration resistance with a weight increase of only 0.03% at 1600 °C. Microstructural analysis revealed that a dense matrix consisting of intergranular calcium–silicate phases, was dispersed by rounded MgO aggregates. |
| Databáze: | OpenAIRE |
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