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...

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Vydané v:	Metallurgical and materials transactions. B, Process metallurgy and materials processing science Ročník 49; číslo 6; s. 3151 - 3163
Hlavní autori:	du Preez, S. P., Beukes, J. P., van Zyl, P. G., Tangstad, M., Tiedt, L. R.
Médium:	Journal Article
Jazyk:	English
Vydavateľské údaje:	New York Springer US 01.12.2018 Springer Nature B.V
Predmet:	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
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Shrnutí:	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.
Bibliografia:	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