Silicon Carbide Formation Enhanced by In-Situ-Formed Silicon Nitride: An Approach to Capture Thermal Energy of CO-Rich Off-Gas Combustion

Carbothermic smelting of ores to produce metals or alloys in alternating current open/semiclosed and closed submerged arc furnaces, or in closed direct current furnaces, results in large volumes of CO-rich off-gas being generated. Most of the CO-rich off-gas is cleaned and flared on stacks, since th...

Ausführliche Beschreibung

Gespeichert in:
Bibliographische Detailangaben
Veröffentlicht in:Metallurgical and materials transactions. B, Process metallurgy and materials processing science Jg. 49; H. 6; S. 3151 - 3163
Hauptverfasser: du Preez, S. P., Beukes, J. P., van Zyl, P. G., Tangstad, M., Tiedt, L. R.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York Springer US 01.12.2018
Springer Nature B.V
Schlagworte:
AIR
ALLOYS
ALTERNATING CURRENT
ANTHRACITE
ARC FURNACES
CARBON MONOXIDE
Carbothermic reactions
Characterization and Evaluation of Materials
Chemistry and Materials Science
COMBUSTION
CONTROLLED ATMOSPHERES
DIRECT CURRENT
Electric arc furnaces
Ferrochromium
Fines
FLARING
Furnaces
Industrial applications
MATERIALS SCIENCE
Metallic Materials
METALS
Minerals
MIXTURES
Nanotechnology
NITROGEN
ORES
PARTICLE SIZE
QUARTZ
Silicon carbide
SILICON CARBIDES
Silicon nitride
SILICON NITRIDES
SMELTING
Structural Materials
Submerged arc electric furnaces
Surfaces and Interfaces
Thermal energy
Thin Films
TOXICITY
WASTE PROCESSING
Si3N4 Formation
Carbonaceous Reductant
Submerged Arc Furnace (SAFs)
Anthracite Fines
Anthracite Particles
ISSN:1073-5615, 1543-1916
Online-Zugang:Volltext
Tags: Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
Beschreibung
Zusammenfassung:Carbothermic smelting of ores to produce metals or alloys in alternating current open/semiclosed and closed submerged arc furnaces, or in closed direct current furnaces, results in large volumes of CO-rich off-gas being generated. Most of the CO-rich off-gas is cleaned and flared on stacks, since the storing of large volumes is problematic due to the associated toxic and explosive risks. Flaring of CO-rich off-gas results in significant wastage of energy. In this study, an alternative method to partially capture the thermal energy associated with off-gas combustion, in the form of silicon carbide (SiC) generated from waste materials (quartz and anthracite fines), is proposed. SiC can partially replace conventional carbonaceous reductants used to produce alloys such as ferrochromium. The influences of quartz and anthracite particle size, treatment temperature, and gaseous atmosphere (nitrogen or air) on SiC formation were investigated. A quartz-anthracite mixture with 90 pct of the particles < 350.9  µ m carbothermically treated at 1873.15 K (1600 °C) resulted in almost complete conversion of quartz to SiC in both nitrogen and air atmospheres. The study indicated significant potential for industrial application of the process.
Bibliographie:ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
content type line 14
ISSN:1073-5615
1543-1916
DOI:10.1007/s11663-018-1413-6