Catalytic coal-tar decomposition to enhance reactivity of low-grade iron ore

Cahyono, Rochim Bakti; Rozhan, Alya Naili; Yasuda, Naoto; Nomura, Takahiro; Hosokai, Sou; Kashiwaya, Yoshiaki; Akiyama, Tomohiro

doi:10.1016/j.fuproc.2013.03.012

Cited by 44 publications

(35 citation statements)

References 22 publications

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“…[20,21] However, this reduction reaction occurs at a relatively lower temperature of 800 o C. Research [21] indicated that the carbonized iron ore is considered more reactive than the mixture of coke and iron ore due to the nanoscale contact of iron ore and carbon that enhances the reactivity. Thus, the presence of benzene in the feed gas exhibits a positive effect at high temperatures over 800 o C in terms of iron oxide reduction.…”

Section: Variations Of Phase Compositions With Reduction Temperature mentioning

confidence: 99%

Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Huang

et al. 2016

Chinese Journal of Chemical Engineering

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Section: Variations Of Phase Compositions With Reduction Temperature mentioning

confidence: 99%

Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Huang

et al. 2016

Chinese Journal of Chemical Engineering

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“…One study 33) focuses on bio-tar decomposition process within porous steelmaking slag using the chemical vapor infiltration, CVI © 2015 ISIJ method to partially substitute coke breeze in sintering machine in steelworks. Employing the same CVI method, another study 34) focused on the reduction process of iron ore by tar decomposition within low-grade iron ore. Low-grade iron ore is made porous by dehydration process where combined water content within it is removed, causing cracking to initiate and propagate. [35][36][37] Production of carbon-infiltrated carbonaceous materials especially by using CVI method has been done to densify graphitic carbon to produce C/C composites.…”

Section: )mentioning

confidence: 99%

Development of Carbon-infiltrated Bio-char from Oil Palm Empty Fruit Bunch

et al. 2015

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This paper presents a technology to utilize bio-char and bio-tar from the pyrolysis of oil palm empty fruit bunch, EFB. In this study, tar vapor from pyrolysis of EFB was infiltrated within porous bio-char and carbon deposition occurred on the pore surface by chemical vapor infiltration process. For preparation, EFB particles were made into pellets. In the first part of experiments, porous bio-char pellets were produced by slowly heating the EFB pellets in a tube furnace in argon atmosphere to terminal temperatures of 500-800°C. In the second part, the porous bio-char pellets were used as precursor for tar decomposition process to deposit carbon within the bio-char pores. Tar vapor was obtained from the pyrolysis of EFB at 400-500°C at a fast heating rate for tar decomposition to occur. The purpose of this research is to investigate the amount of carbon deposited within bio-char by this tar carbonization process as compared to carbon contents of metallurgical coke. We showed how EFB bio-char was used as the tar filter and in the process to produce carbon-infiltrated bio-char, a useful renewable energy source for ironmaking process.

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“…The use of biomass in iron ore reduction provides a good interaction between iron ore and biomass. The iron ore plays a good role as a catalyst for the pyrolysis process of biomass into the volatile matter, carbon, and gas [10,11] and, simultaneously, the pyrolysis results become reducing agents that encourage reduction reaction.…”

Section: Introductionmentioning

confidence: 99%

Reduction Reactivity of Low Grade Iron Ore-Biomass Pellets for a Sustainable Ironmaking Process

et al. 2021

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Currently, fossil fuels are still the primary fuel source and reducing agent in the steel industries. The utilization of fossil fuels is strongly associated with CO2 emissions. Therefore, an alternative solution for green steel production is highly recommended, with the use of biomass as a source of fuel and a reducing agent. Biomass’s growth consumes carbon dioxide from the atmosphere, which may be stored for variable amounts of time (carbon dioxide removal, or CDR). The pellets used in this study were prepared from a mixture of low-grade iron ore and palm kernel shells (PKS). The reducing reactivity of the pellets was investigated by combining thermogravimetric analysis (TGA) and laboratory experiments. In the TGA, the heating changes stably from room temperature to 950 °C with 5–15 °C/min heating rate. The laboratory experiments’ temperature and heating rate variations were 600–900 °C and 10–20 °C/min, respectively. Additionally, the reduction mechanism was observed based on the X-ray diffraction analysis of the pellets and the composition of the reduced gas. The study results show that increasing the heating rate will enhance the reduction reactivity comprehensively and shorten the reduction time. The phase change of Fe2O3 → Fe3O4 → FeO → Fe increases sharply starting at 800 °C. The XRD intensities of Fe compounds at a heating rate of 20 °C/min are higher than at 10 °C/min. Analysis of the reduced gas exhibits that carbon gasification begins to enlarge at a temperature of 800 °C, thereby increasing the rate of iron ore reduction. The combination of several analyses carried out shows that the reduction reaction of the mixture iron ore-PKS pellets runs optimally at a heating rate of 20 °C/min. In this heating rate, the reduced gas contains much higher CO than at the heating rate of 10 °C/min at temperatures above 800 °C, which encourages a more significant reduction rate. In addition, the same reduction degree can be achieved in a shorter time and at a lower temperature for a heating rate of 20 °C/min compared to 10 °C/min.

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Catalytic coal-tar decomposition to enhance reactivity of low-grade iron ore

Cited by 44 publications

References 22 publications

Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Integration of coal pyrolysis process with iron ore reduction: Reduction behaviors of iron ore with benzene-containing coal pyrolysis gas as a reducing agent

Development of Carbon-infiltrated Bio-char from Oil Palm Empty Fruit Bunch

Reduction Reactivity of Low Grade Iron Ore-Biomass Pellets for a Sustainable Ironmaking Process

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