Kinetic investigation of self-reduction basic oxygen furnace dust briquettes using charcoals from different biomass

Coleti, Jorge Luís; Manfredi, Gabriel Valério Pereira; Vinhal, Jonathan Tenório; Junca, Eduardo; Espinosa, Denise Crocce Romano; Tenório, Jorge Alberto Soares

doi:10.1016/j.jmrt.2020.09.061

Cited by 15 publications

(17 citation statements)

References 27 publications

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“…The rate-controlling mechanism is the 3-D diffusion model (Z-L-T), namely [(1−α) 1/3 −1] 2 at the last stage. These findings were similar to those obtained by other researchers [1,6,35,37].…”

Section: Kinetics Analysissupporting

confidence: 93%

“…In recent years, global population growth has necessitated increased industrial production and, as a result, rising energy demand. In this view, using renewable energy sources (such as biomass) as an alternative to fossil fuels appears to be a vital option for lowering greenhouse gas emissions [6,7]. According to Safarian et al [8], biomass accounts for only 9.7 percent of primary energy, whereas fossil fuels account for 81.4 percent.…”

Section: Introductionmentioning

confidence: 99%

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Comparative Study on the Isothermal Reduction Kinetics of Iron Oxide Pellet Fines with Carbon-Bearing Materials

et al. 2022

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The isothermal reduction of iron oxide pellet fines–carbon composites was investigated at temperatures of 900–1100 °C. The reduction reactions were monitored using the thermogravimetric (TG) technique. Alternatively, a Quadruple Mass Spectrometer (QMS) analyzed the CO and CO2 gases evolved from the reduction reactions. The effect of temperature, carbon source, and reaction time on the rate of reduction was extensively studied. The phase composition and the morphological structure of the reduced composites were identified by X-ray diffraction (XRD) and a scanning electron microscope (SEM). The results showed that the reduction rate was affected by the temperature and source of carbon. For all composite compacts, the reduction rate, as well as the conversion degree (α) increased with increasing temperature. Under the same temperature, the conversion degree and the reduction rate of composites were greater according to using the following carbon sources order: Activated charcoal > charcoal > coal. The reduction of the different composites was shown to occur stepwise from hematite to metallic iron. The reduction, either by activated charcoal or charcoal, is characterized by two behaviors. During the initial stage, the chemical reaction model (1 − α)−2 controls the reduction process whereas the final stage is controlled by gas diffusion [1 − (1 − α)1/2]2. In the case of reduction with coal, the reduction mechanism is regulated by the Avrami–Erofeev model [−ln (1−α)2] at the initial stage. The rate-controlling mechanism is the 3-D diffusion model (Z-L-T), namely [(1−α)−1/3−1]2 at the latter stage. The results indicated that using biomass carbon sources is favorable to replace fossil-origin carbon-bearing materials for the reduction of iron oxide pellet fines.

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Section: Kinetics Analysissupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Isothermal Reduction Kinetics of Iron Oxide Pellet Fines with Carbon-Bearing Materials

et al. 2022

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“…It means that the iron ore reduction by solid carbon happens through gaseous intermediates. As explained by Coleti et al 27 the iron oxide is initially reduced in a close contact with solid carbon forming CO, which reacts with the iron oxide generating CO 2 . Finally, CO 2 reacts with solid carbon to produce more CO through the Boudouard reaction.…”

Section: Production Of Co and H2 By Water‐splitting Thermochemical Cy...mentioning

confidence: 96%

“…The variation of carbonaceous materials used in steel briquettes has been studied by some authors [27][28][29] and the amount of research has increased notably in the last decade. Due to the goal of processing sustainable carbonaceous materials that, in turn, meet requirements of F I G U R E 1 Schematic representation for the production of CO and hydrogen gases mechanical strength and reactivity, which are necessary characteristics for the proper processing.…”

Section: Production Of Co and H By Water-splitting Thermochemical Cyc...mentioning

confidence: 99%

“…Due to the goal of processing sustainable carbonaceous materials that, in turn, meet requirements of F I G U R E 1 Schematic representation for the production of CO and hydrogen gases mechanical strength and reactivity, which are necessary characteristics for the proper processing. 24 Coleti et al 27 studied self-reducing briquettes originated from different biomasses from charcoal, palm oil charcoal, and eucalyptus bark charcoal, they concluded that for all carbon sources, a reduction reaction occurred during two stages (700 C-800 C and 850 C-950 C). In the first stage, a gasification of the char at a slower stage took place.…”

Section: Production Of Co and H By Water-splitting Thermochemical Cyc...mentioning

confidence: 99%

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Experimental study of a two‐stage thermochemical cycle for hydrogen production

Cardona

Narita

Mourão

et al. 2021

Intl J of Energy Research

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The use of renewable energy sources is the main strategy toward a low-carbon society. A promising alternative for the production of hydrogen gas is the water-splitting thermochemical cycles activated by solar energy. This work presents an experimental study of a two-stage thermochemical cycle for hydrogen production. It is based on the carbothermic reduction of iron ore (Fe 2 O 3 ) and the re-oxidation of it with steam can be powered by concentrated solar energy. Samples studied were self-reducing pellets. The first stage of the proposed cycle consists in the reduction of hematitic iron oxide into its own metal at temperatures above 1173 K. The second phase of the cycle consists of iron metal oxidation by steam, which produces hydrogen gas. Sponge iron samples obtained in this work had a specific surface area of 35.05 m 2 /g measured by the BET method, which is a high value compared to specific surface areas obtained from conventional processes. It was shown that at 973 K the hydrogen gas production rate is slower, whereas at 1073 K and at 1173 K the sample reached 63% of its maximum oxygen gain between 2 and 7.5 minutes, respectively. As the hydrogen gas production rate is also proportional to the iron oxidation rate, it was shown to be very important to balance out the hydrogen gas production over the entire cycle time as a function of temperature. Finally, the analyzed thermochemical cycle can also operate with any other renewable carbon source.

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Kinetic investigation on the reduction of iron concentrate-charcoal composite briquette by forced stepwise isothermal analysis (FSIA)

Vinhal

Coleti

Khajavi

et al. 2022

J Therm Anal Calorim

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Kinetic investigation of self-reduction basic oxygen furnace dust briquettes using charcoals from different biomass

Cited by 15 publications

References 27 publications

Comparative Study on the Isothermal Reduction Kinetics of Iron Oxide Pellet Fines with Carbon-Bearing Materials

Comparative Study on the Isothermal Reduction Kinetics of Iron Oxide Pellet Fines with Carbon-Bearing Materials

Experimental study of a two‐stage thermochemical cycle for hydrogen production

Kinetic investigation on the reduction of iron concentrate-charcoal composite briquette by forced stepwise isothermal analysis (FSIA)

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