NDLI: Carbothermic Reduction Reactions at the Metal–Slag Interface in Ti-Bearing Slag from a Blast Furnace

Content Provider	Springer Nature Link
Author	Wang, Yao Zu Zhang, Jian Liang Liu, Zheng Jian Du, Cheng Bo
Copyright Year	2017
Abstract	Carbothermic reduction reactions at the metal–slag interface and the mechanisms of iron loss during the smelting of vanadium-bearing titanomagnetite in a blast furnace are still not clear as a result of the limited ability to observe the high-temperature zone of a blast furnace. The chemical composition of a Ti-bearing slag was determined by x-ray fluorescence and x-ray diffraction. The interfaces were characterized by scanning electron microscopy coupled with energy-dispersive x-ray spectroscopy. The interfacial chemical reactions were deduced based on the characterization results and on the thermodynamic calculations performed using Factsage 6.4. The results indicated that the forms of iron in the slag were iron droplets wetted by Ti(C$_{ x }$, N$_{1−x }$), mechanically separated by iron and iron oxide. The different forms possessed unique characteristics and were formed by different mechanisms. Iron droplets wetted by Ti(C$_{ x }$, N$_{1−x }$) were generated through a series of interfacial reactions between TiO$_{2}$ in the slag and [C] and [N] in the metal. Iron droplets without attached Ti(C$_{ x }$, N$_{1−x }$) were mainly located on the edges of pores and were attributed to the reduction of Fe$_{ x }$O in the slag. Insufficient reduction of iron-bearing minerals made it difficult for iron droplets to aggregate and separate from the slag, which created an Fe$_{ x }$O-enriched zone.
Starting Page	2397
Ending Page	2403
Page Count	7
File Format	PDF
ISSN	10474838
Journal	JOM
Volume Number	69
Issue Number	11
e-ISSN	15431851
Language	English
Publisher	Springer US
Publisher Date	2017-08-15
Publisher Institution	The Minerals, Metals & Materials Society (TMS)
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Engineering Chemistry/Food Science Physics Environment Earth Sciences
Content Type	Text
Resource Type	Article
Subject	Engineering Materials Science

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