Glass-ceramic materials from electric arc furnace dust.
Electric arc furnace dust (EAFD) was vitrified with SiO2, Na2CO3 and CaCO3 powders in an electric furnace at ambient atmosphere. Vitreous products were transformed into glass-ceramic materials by two-stage heat treatment, at temperatures determined by differential thermal analysis. Both vitreous and glass-ceramic materials were chemically stable. Wollastonite (CaSiO3) was separated from the parent matrix as the dominant crystalline phase, verified by X-ray diffraction analysis and energy dispersive spectrometry. Transmission electron microscopy revealed that wollastonite crystallizes mainly in its monoclinic form. Knoop microhardness was measured with the static indentation test method in all initial vitreous products and the microhardness values were in the region of 5.0-5.5 GPa. Devitrification resulted in glass-ceramic materials with microhardness values strongly dependent on the morphology and orientation of the separated crystal phase.
Kavouras
P
P
Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
Kehagias
T
T
Tsilika
I
I
Kaimakamis
G
G
Chrissafis
K
K
Kokkou
S
S
Papadopoulos
D
D
Karakostas
Th
T
D002516:Ceramics / Q000138:chemical synthesis*; D004391:Dust / Q000032:analysis; D006245:Hardness Tests; D006256:Hazardous Waste; D006358:Hot Temperature; D007220:Industrial Waste; D012037:Refuse Disposal / Q000379:methods*; D013232:Steel
D004391:Dust; D006256:Hazardous Waste; D007220:Industrial Waste; D013232:Steel; C023506:Glass ceramics