Effect of carbon species on the reduction and melting behavior of boron-bearing iron concentrate/carbon composite pellets

Iron nugget and boron-rich slag can be obtained in a short time through high-temperature reduction of boron- bearing iron concentrate by carbonaceous material, both of which are agglomerated together as a carbon composite pellet. This is a novel flow sheet for the comprehensive utilization of boron-...

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Bibliographic Details
Published in:International journal of minerals, metallurgy and materials metallurgy and materials, 2013-06, Vol.20 (6), p.522-528
Main Authors: Wang, Guang, Ding, Yin-gui, Wang, Jing-song, She, Xue-feng, Xue, Qing-guo
Format: Article
Language:English
Subjects:
Anthracite
Boron
Carbon
Carbonaceous materials
Ceramics
Characterization and Evaluation of Materials
Chemistry and Materials Science
Coke
Composites
Concentrates (ores)
Corrosion and Coatings
Glass
High temperature
Iron
Materials Science
Melting
Melts
Metallic Materials
Natural Materials
Particulate composites
Pellets
Reducing agents
Reduction
Slag
Surfaces and Interfaces
Thin Films
Tribology
含硼铁精矿
复合物
复合颗粒
熔化行为
物种
球团矿
碳质材料
高温还原
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Summary:Iron nugget and boron-rich slag can be obtained in a short time through high-temperature reduction of boron- bearing iron concentrate by carbonaceous material, both of which are agglomerated together as a carbon composite pellet. This is a novel flow sheet for the comprehensive utilization of boron-bearing iron concentrate to produce a new kind of man-made boron ore. The effect of reducing agent species （i.e., carbon species） on the reduction and melting process of the composite pellet was investigated at a laboratory scale in the present work. The results show that, the reduction rate of the composite pellet increases from bituminite, anthracite, to coke at temperatures ranging from 950 to 1300~C. Reduction temperature has an important effect on the microstructure of reduced pellets. Carbon species also affects the behavior of reduced metallic iron particles. The anthracite-bearing composite pellet melts faster than the bituminite- bearing composite pellet, and the coke-bearing composite pellet cannot melt due to the high fusion point of coke ash. With anthracite as the reducing agent, the recovery rates of iron and boron are 96.5% and 95.7%, respectively. This work can help us get a further understanding of the new process mechanism.
ISSN:1674-4799
1869-103X
DOI:10.1007/s12613-013-0760-1