Crystallization kinetics of magnetic glass-ceramics prepared by the processing of waste materials
- Central Metallurgical Research and Development Institute (CMRDI), P.O. Box Helwan, Cairo (Egypt)
The objective of the present investigation was to study the feasibility of conversion of an intimate mixture of blast furnace slag and blast furnace flue dust generated by a single industrial company into magnetic glass-ceramic product. Blast furnace slag (BFS) and blast furnace flue dust (BFD) are generated at a rate of 300,000 and 30,000 tons/year, respectively, from iron and steel factory. The crystallization mechanisms of a composition containing BFS and BFD in a 50/50 proportion were investigated by differential thermal analysis (DTA), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The crystallization temperature was found to vary from 900 to 1100 deg. C and two phases appeared in the crystallized samples: pyroxene Ca(Mg, Fe, Al)(Si, Al){sub 2}O{sub 6} and magnetite/maghemite. Heating rate and particle sizes effects on crystal growth of powdered samples were studied by DTA. The apparent activation energy of crystal growth using the particle size 180-315 {mu}m was determined to be 355 and 329 kJ/mol for the first and second peak, respectively. The presence of sharp and broad crystallization peaks indicate simultaneous surface and internal crystallization mechanism. Good wear resistance and chemical durability particularly in alkaline environment, combine with good hardness and magnetic properties make this glass-ceramic material potentially useful for various industrial applications.
- OSTI ID:
- 20895228
- Journal Information:
- Materials Research Bulletin, Vol. 41, Issue 6; Other Information: DOI: 10.1016/j.materresbull.2005.11.002; PII: S0025-5408(05)00412-5; Copyright (c) 2005 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ACTIVATION ENERGY
BLAST FURNACES
BUNDESAMT FUER STRAHLENSCHUTZ
CERAMICS
CRYSTAL GROWTH
CRYSTALLIZATION
DIFFERENTIAL THERMAL ANALYSIS
DUSTS
GLASS
HARDNESS
HEATING RATE
MAGNETIC PROPERTIES
MAGNETITE
PARTICLE SIZE
SCANNING ELECTRON MICROSCOPY
SILICATE MINERALS
STEELS
WASTES
WEAR RESISTANCE
X-RAY DIFFRACTION