This work describes a new biomass ironmaking that uses
low-grade iron ore and woody biomass for promoting the direct reduction
of a nanoporous iron ore infiltrated and carbonized with biomass tar
(biotar). The mechanism and kinetics of the reduction reaction of
the carbon-infiltrated ore were systematically studied by means of
thermogravimetric analysis with X-ray diffraction (XRD) and Raman
scattering spectrometry. The results showed that the carbon-infiltrated
ore reduced at a significantly lower temperature than the mixture
of reagent magnetite and metallurgical coke. It was confirmed that
this high reactivity was due to the nanoscale contact between carbon
and the ore and the less fused and less cross-linked nature of the
biotar-derived carbon. From the combination of thermogravimetry and
XRD analyses, it is revealed that the reduction reaction occurred
serially in three steps: re-evaporation and/or carbonization of biotar,
reduction of magnetite to wüstite, and reduction of wüstite
to iron. Finally, the kinetic parameters for each reaction were summarized
by the Friedman–Ozawa method.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.