Phase equilibrium, microstructure and properties of some magnesite-chromite refractories

Autor: L. G. Girgis, M. A. Serry, A. G. M. Othman, W. Weisweiler
Rok vydání: 1996
Předmět:
Zdroj: Scopus-Elsevier
ISSN: 1573-4803
0022-2461
Popis: The effect of phase equilibrium and microstructure of magnesite-chromite batches containing from 0 to 100% Egyptian chrome ore, with intervals of 10%, on their physical properties was studied. The phase equilibrium data were calculated using the phase relationships within the system M-M2S-CMS-MR (M=MgO, S=SiO2, C=CaO, R=R2O3). A computerized electron-probe microanalyser was applied to study the microstructure as well as microchemistry of the fired magnesite-chromite co-clinkers. Some physical and technological properties of the co-clinkered briquettes were also investigated by determining densification parameters, spalling resistance and load-bearing capacity. It is concluded that dense, spalling resistant and refractory magnesite, magnesite-chrome and chrome-magnesite refractories could be produced by co-clinkering of magnesite-chromite batches of 100∶0, 70∶30 and 30∶70 weight ratios, respectively, at 1600 °C. The prepared co-clinkers were subsequently graded, moulded and refired up to 1700 °C in order to obtain direct-bonded bricks. Meanwhile, dense chromite refractories with lower refractory quality could be processed by firing the Egyptian chrome ore up to 1600 °C.
Databáze: OpenAIRE
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