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Influence of Aluminum-Carbon Composite Pellets on FeO Reduction and Iron Recovery from Electric Arc Furnace Slag

Title
Influence of Aluminum-Carbon Composite Pellets on FeO Reduction and Iron Recovery from Electric Arc Furnace Slag
Author
박주현
Issue Date
2019-01
Publisher
SPRINGER
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE, v. 50, No. 2, Page. 903-913
Abstract
We investigated the effect of Al-C composite pellets (ACCP) on the reduction behavior of FeO in electric arc furnace (EAF) slag and the iron recovery at different n(Al)/(n(Al)+n(C)) at 1823K (1550 degrees C). A carbothermic reaction was the dominant process at n(Al)/(n(Al)+n(C)) <0.4, whereas aluminothermic reduction was the major process at n(Al)/(n(Al)+n(C)) >0.6; these observations are based on the final content of FeO and Al2O3 in the molten slag. The aluminum and carbon present in the ACCP competitively affected the reaction stoichiometry (i.e., the material balance) between the production of CO+Al2O3 and the consumption of FeO. Iron recovery increased up to a yield of approx. 90 pct as the n(Al)/(n(Al)+n(C)) ratio increased. Because Al in the ACCP readily reacts to reduce FeO in the molten slag, iron recovery is proportional to the n(Al)/(n(Al)+n(C)) ratio. The precipitation of solid compounds in the slag phase, such as monoxide ([Mg,Fe] O ) and spinel (MgO Al 2O3), occurred during FeO reduction; this was experimentally confirmed as well as by thermochemical computation. Furthermore, we proposed a schematic reaction mechanism in the present study.
URI
https://link.springer.com/article/10.1007%2Fs11663-018-1484-4http://repository.hanyang.ac.kr/handle/20.500.11754/121824
ISSN
1073-5615; 1543-1916
DOI
10.1007/s11663-018-1484-4
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MATERIALS SCIENCE AND CHEMICAL ENGINEERING(재료화학공학과) > Articles
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