José Roberto de Oliveira

Dr. José Roberto de Oliveira


Research Focus & Metrics

Academic Career Length

17Years (2010-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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28 June 2016 in Journal of Thermal Analysis and Calorimetry
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Journal Article
Closed access
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Eduardo JuncaEduardo Junca
Eduardo Junca
TRThomaz Augusto Guisard Restivo
Thomaz Augusto Guisard Restivo
JOJosé Roberto de Oliveira
José Roberto de Oliveira
Denise Crocce Romano EspinosaDenise Crocce Romano Espinosa
Denise Crocce Romano Espinosa
JTJorge Alberto Soares Tenório
Jorge Alberto Soares Tenório

4 May 2024 in Journal of Cleaner Production
Verified
Journal Article
Closed access
LNLucio Rosso Neto
Lucio Rosso Neto
CBCarlos Henrique Borgert
Carlos Henrique Borgert
FGFelipe Grillo
Felipe Grillo
JOJosé Roberto de Oliveira
José Roberto de Oliveira
JCJorge Luís Coleti
Jorge Luís Coleti
Eduardo JuncaEduardo Junca
Eduardo Junca

1 December 2013 in Rem: Revista Escola de Minas
Verified
Journal Article
Open access
FGFelipe Grillo
Felipe Grillo
RSRaphael de Alcantara Sampaio
Raphael de Alcantara Sampaio
JVJosé Flávio Viana
José Flávio Viana
Denise Crocce Romano EspinosaDenise Crocce Romano Espinosa
Denise Crocce Romano Espinosa
JOJosé Roberto de Oliveira
José Roberto de Oliveira

1 November 2021 in Journal of Materials Research and Technology
Verified
Journal Article
Open access
RSRaphael Mariano de Souza
Raphael Mariano de Souza
VAVinícios Andreatta
Vinícios Andreatta
ISInamara Amanda Souza Santos
Inamara Amanda Souza Santos
Eduardo JuncaEduardo Junca
Eduardo Junca
FGFelipe Grillo
Felipe Grillo
JOJosé Roberto de Oliveira
José Roberto de Oliveira

1 March 2019 in REM - International Engineering Journal
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Journal Article
Open access
PDF file
Eduardo JuncaEduardo Junca
Eduardo Junca
FGFelipe Grillo
Felipe Grillo
JAJoner Oliveira Alves
Joner Oliveira Alves
JOJosé Roberto de Oliveira
José Roberto de Oliveira
TRThomaz Augusto Gisard Restivo
Thomaz Augusto Gisard Restivo
JTJorge Alberto Soares Tenório
Jorge Alberto Soares Tenório
The large amount of dust generated in electric arc furnace aligned with its chemical composition makes this dust a potential source of iron in the direct reduction iron process. Thus, the aim of this research is to investigate the reduction of pellets produced with electric arc furnace dust using hydrogen as the reducing agent. The kinetic investigation was examined applying the differential method. In addition, the influence of reducing gas stream and temperature in the reduction process were investigated applying the Forced Stepwise Isothermal Analysis technique. The temperature studied varied from 500 to 1000°C with isothermals in each 50°C. The reducing gas was a mixture of 10% of hydrogen and 90% of argon. Then, the product characterization was carried out via scanning electron microscope and X-ray analysis. A thermogravimetric test showed a mass loss of 42 wt% due to the reduction of iron and zinc oxides. Besides this, the reduction occurred in three steps: 550-650°C, 700-800°C, 850-950°C. Between 550-650°C, the reduction was controlled by a nucleation mechanism with an Ea of 41.1 kJ/mol. In the second step (700-800°C), a mixed control between nucleation and diffusion was obtained with an Ea of 89.1 kJ/mol. Furthermore, a crust of iron was formed around the pellet, which hindered the reducing gas diffusion into the pellet. In the third stage (850-950°C), the formation of a sintered structure was noted, which decreased pore volume. The internal diffusion of reducing gases was determined as the controlling mechanism, with an Ea of 130.9 kJ/mol.

5 May 2023 in Journal of Materials Research and Technology
Verified
Journal Article
Open access
DCDaniel Mapa Clemente
Daniel Mapa Clemente
CSCarlos Antônio da Silva
Carlos Antônio da Silva
JPJohne Jesus Mol Peixoto
Johne Jesus Mol Peixoto
JOJosé Roberto de Oliveira
José Roberto de Oliveira
RSRaphael Mariano de Souza
Raphael Mariano de Souza