期刊
CERAMICS INTERNATIONAL
卷 47, 期 22, 页码 31130-31137出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2021.07.287
关键词
Magnesite; Lightweight; Magnesium oxide; Silicon kerf waste; Closed porosity
资金
- National Natural Science Foundation of China [U1908227, U20A20239]
- Fundamental Research Funds for the Central Universities [N2125002]
- open research fund for State Key Laboratory of Advance Refractories [SKLAR202001]
By incorporating silicon kerf waste, lightweight magnesia refractory ceramics with a closed porosity of 6.5% were successfully prepared, suitable for the working lining of metallurgical furnaces.
Partial/full replacement of traditional dense refractory aggregates (for furnace lining) with lightweight aggregates is considered to be an effective and promising strategy for energy saving and emission reduction. In this work, lightweight magnesia refractory ceramics with tailored closed porosity were prepared by one-step sintering at 1600 degrees C from high-purity magnesite added with silicon kerf waste in different ratios, with the emphasis on the evolution of their phase compositions, micromorphologies, and various properties. With the addition of additives, Mg2-xFexSiO4 solid solution was formed at the grain boundaries of the MgO matrix, and then the volumetric expansion effect (interfacial reaction) and activated sintering effect (vacancy defect) promote the decrease of apparent porosity and the increase of closed porosity, respectively. Consequently, MgO ceramics with apparent/closed porosity of 0.6%/6.5%, bulk density of 3.25 g cm(-3), and lightweight index of 7.8% were successfully prepared, suitable for the working lining of metallurgical furnaces.
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