Abstract
Ferro-coke, as a new burden of blast furnace (BF), can not only greatly reduce the energy consumption and CO2 emission, but also promote the resource utilization by using the low-quality iron ore and low-grade coal. However, the strength of ferro-coke decreased with the increasing amount of iron ore powder. In order to maintain the strength of ferro-coke while increasing the amount of iron ore powder, it is necessary to add binder during the coking process to enhance the strength of ferro-coke. In this paper, phenolic resin, silicon metal powder, corn starch, and coal tar pitch were used as binder for the fabrication of ferro-coke. I-type drum machine (I 600), scanning electron microscope (SEM), and X-ray diffraction (XRD) were applied to test the crushing strength, morphology, and microcrystalline structure of the ferro-coke. The results showed that the increasing amount of iron ore powder resulted in lower crushing strength, higher porosity, and the worse macroscopic morphology of ferro-coke. When the amount of iron ore powder reached 40%, obvious cracks appeared on the surface of ferro-coke. When the amount of iron ore was 30%, the crushing strength of ferro-coke dropped to 18.15%. Among the four binders, coal tar pitch could significantly enhance the cold crushing strength of ferro-coke through decreasing the porosity of ferro-coke and improving the bonding effect between carbon matrix particles. In the case of the 10% coal tar pitch addition, the cold crushing strength of ferro-coke was increased from 18.15% to 76.41%; meanwhile, its hot compression strength during gasification improved by 100N.
Highlights
Faced with the shortage of resources and the challenge of the environment, green growth has become a new indispensable development pattern [1]
High fluidity hyper-coal (HF-HPC) were as two different binders added in the same coal; the results showed that HPC and high fluidity hyper-coal (HF-HPC) could both enhance adhesiveness between coal particles
The following conclusions can be obtained by investigating the effect of iron ore The following conclusions can be obtained by microstructure, investigating the of iron ore powpowder and binders on the macroscopic morphology, andeffect crushing strength ferro-coke: derofand binders on the macroscopic morphology, microstructure, and crushing strength
Summary
Faced with the shortage of resources and the challenge of the environment, green growth has become a new indispensable development pattern [1]. It was found that the reactivity of coke increased from 42.5% to 81% after 15% FMG powder addition, while the crushing strength (M25 ) was decreased from 89% to 79%. When the addition amount of FMG powder reached 20%, the reactivity of ferro-coke remained basically unchanged, and the crushing strength (M25 ) decreased to 58%. Hongtao Wang [16] increased the cold compressive strength of ferro-coke to 3490.89~4305.40 N by improving the preparation process. Ataru Uchida [21] added hyper-coal (HPC), as a binder, into slightly-caking coal; the cold compressive strength of ferro-coke was increased significantly. Four types of binders (phenolic resin, silicon metal powder, corn starch, and coal tar pitch) were added into the coal to test their effect on the cold and hot crushing strength of ferro-coke
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