Article
Metallurgy & Metallurgical Engineering
Colin Commandeur, Rudolf Sprik, Chris Stolk, Gerard Louwerse
Summary: The thickness of the blast furnace hearth refractory is crucial for safe operation. The impact-echo method is a useful approach for estimating the refractory thickness, but caution is required when dealing with multi-layered structures. In this study, an alternative method based on transmission line theory is proposed, which shows good agreement with 2D finite element analysis for simple layered structures. However, both the impact-echo method and the proposed method tend to overestimate the refractory thickness.
IRONMAKING & STEELMAKING
(2023)
Article
Computer Science, Information Systems
Jiaocheng Ma, Xuewei Wen, Xin Zhao
Summary: Understanding the remaining thickness of blast furnace hearth refractory is crucial for extending the service life of a blast furnace. A multi-information fusion method was proposed to measure refractory lining thickness more accurately, improving measurement accuracy compared to traditional methods.
Article
Chemistry, Applied
Sai Meng, Kexin Jiao, Jianliang Zhang, Yanbing Zong, Lei Zhang, Hengbao Ma, Ziyu Guo
Summary: This study systematically examined the macroscopic morphology, size distribution, and voidage variation of deadman coke in a commercial blast furnace through dissection and image processing methods. The research findings provide important references for high efficiency and low carbon smelting in blast furnace operation.
FUEL PROCESSING TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
Jian Cao, Jianliang Zhang, Cui Wang, Yong Deng, Guohua Zhang, Mingbo Song
Summary: The erosion mechanism of carbon bricks in a blast furnace hearth was studied after dissection of a large blast furnace. Elephant foot erosion characteristics were observed in the height direction of the blast furnace. X-ray diffraction, scanning electron microscopy-energy dispersive spectroscopy, and chemical analysis were used to characterize the existing forms of carbon bricks after service. The study revealed that Zn and iron erosion played a key role in the erosion of carbon bricks, particularly above and below the taphole.
Article
Energy & Fuels
Kexin Jiao, Guangxiang Feng, Jianliang Zhang, Hengbao Ma, Ziyu Guo
Summary: This study investigated the formation mechanism of the graphite-rich iron protective layer in blast furnace hearth. It found that coarse graphite was formed in the upper part of the protective layer, with a screw spire-like surface morphology, while the bottom was mainly flaky. The graphitization degree and structural order increased from the upper to the bottom of the hearth, enhancing its ability to resist scouring by hot metal.
Article
Chemistry, Applied
Sai Meng, Kexin Jiao, Jianliang Zhang, Cui Wang, Lei Zhang, Ziyu Guo, Zhixin Xiao
Summary: In this study, the distribution characteristics of coke in a 2200m3 blast furnace were analyzed and the utilization ratio of coke in the hearth was determined. Factors that affect coke utilization, such as the presence of CaS and S, K elements, and the influence of ore phase and alkali metal salt, were also discovered.
FUEL PROCESSING TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
X. F. Dong, P. Zulli, J. Tsalapatis, M. Middleton
Summary: A reliable prediction about the current W2BF hearth condition can be made through a consistent assessment based on the various sources over the W2BF campaign.
IRONMAKING & STEELMAKING
(2022)
Article
Metallurgy & Metallurgical Engineering
Yong Deng, Ran Liu, Kexin Jiao, Hongxiu Ma, Ziyu Guo, Sai Meng, Mingbo Song
Summary: The iron-carbon interface is important in the hearth, and a dissection investigation of BFs was conducted to understand the phenomenon and reaction behavior at the interface. The results reveal that the iron-coke interface can be divided into partial coverage and overall coverage. Molten iron penetration from the interface to the center of the coke is observed. The carbon brick at the hot face shows embrittlement layers, pulverization, and cracks near the iron-carbon brick interface. There is a competitive carburization between the iron-coke interface and the iron-carbon brick interface.
ISIJ INTERNATIONAL
(2023)
Article
Construction & Building Technology
Jerome Brulin, Alain Gasser, Amna Rekik, Eric Blond, Frederic Roulet
Summary: This study built a thermomechanical finite element model of a blast furnace hearth, considering different material and joint states. The equivalent material parameters were obtained using experimentally determined interface strength and periodic homogenization method. The model's feasibility was validated by comparing with experimental results on an actual blast furnace, and the importance of initial ramming mix density and joint openings was revealed.
CONSTRUCTION AND BUILDING MATERIALS
(2022)
Article
Thermodynamics
H. Merten, S. Wirtz, H. Bartusch, Y. Kaymak, S. Hojda, R. Lin, V. Scherer
Summary: In the ironmaking blast furnace, layers of coke and iron ore are heated by an uprising gas flow. The iron ore is reduced and melted as it descends. The liquid products slag and hot metal fill the voids within the coke bed, with the slag floating on top of the hot metal. The erosion of carbon blocks in the hearth affects the campaign length of the blast furnace.
THERMAL SCIENCE AND ENGINEERING PROGRESS
(2023)
Article
Materials Science, Ceramics
Mingbo Song, Kexin Jiao, Cui Wang, Yong Deng, Jianliang Zhang
Summary: In this study, an Al2O3-SiC C castable BF was dissected and investigated. The brittle layer of the castable and its phase composition were analyzed. It was found that a brittle layer with Zn enrichment was formed at the bonding surface between the carbon brick and castable. The high-temperature environment caused the evaporation of water and formation of pores and microcracks in the castable, which gradually developed and expanded due to thermal stress. The diffusion of gases and reaction products accelerated the propagation of microcracks, leading to the formation of a macro-brittle layer.
CERAMICS INTERNATIONAL
(2023)
Article
Engineering, Chemical
Lei Wang, Liangyu Chen, Fei Yuan, Lei Zhao, Yang Li, Jiaocheng Ma
Summary: The life of the hearth is the main limiting factor in blast furnace production. A calculation model was established to study thermal stresses in the furnace with severe erosion. The effect of production parameters and deadman condition on thermal stresses was analyzed, providing significant insights for prolonging the safe production life of blast furnaces.
Article
Metallurgy & Metallurgical Engineering
Jian Zhang, Kexin Jiao, Jianliang Zhang, Hengbao Ma, Yanbing Zong, Ziyu Guo, Zhongyi Wang
Summary: This study investigated the effects of basicity, Al2O3 content, and MgO content on the thermal stability of molten slag, with findings indicating changes in specific heat capacity and viscosity of the slag with variations in these parameters.
ISIJ INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Ao Ni, Chengzhi Li, Wei Zhang, Zhixin Xiao, Dongliang Liu, Zhengliang Xue
Summary: The study on hearth erosion is crucial for blast furnace ironmaking, and this research investigates the hearth erosion of the WISCO No. 1 blast furnace through numerical analysis. The areas with high erosion risk were identified, and empirical relationships between erosion depth and wall shear stress and temperature were established.
Article
Metallurgy & Metallurgical Engineering
Chengbo Zhang, Chenxi Zhao, Lei Shao, Henrik Saxen, Yingxia Qu, Zongshu Zou
Summary: A wear model based on the solution of an inverse heat conduction problem was developed to track the evolution of the internal geometry of a large-scale BF in Chinese steelworks, revealing that the skull layer at the bottom of the BF hearth is thicker, preventing excessive lining erosion in the sidewall, and correlating well with taphole length.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Multidisciplinary
Ivan Sorribes, David Ventura-Espinosa, Marcelo Assis, Santiago Martin, Patricia Concepcion, Jefferson Bettini, Elson Longo, Jose A. Mata, Juan Andres
Summary: A novel silver and chromium nanostructured N-doped carbonaceous material was synthesized using a biomass-annealing approach, which exhibited excellent activity and selectivity for the dehydrogenative coupling reaction of silanes and alcohols under mild conditions. The most active species in the catalyst were found to be Ag particles, with their activity boosted by Cr-derived species, and the reaction proceeded through an oxygen-assisted mechanism.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
K. M. Srinivasamurthy, A. El-Denglawey, K. Manjunatha, Jagadeesha Angadi, M. C. Oliveira, E. Longo, S. R. Lazaro, R. A. P. Ribeiro
Summary: This study investigated the structural, electronic, magnetic, and dielectric properties of novel ferrite (CNF) Co1-xNixFe2O4 (x = 0.0, 0.25, 0.5, 0.75, and 1.0) nanoparticles synthesized via a low-cost combustion synthesis technique. The results confirmed the formation of single-phase ferrite with a cubic spinel structure. The electrical properties exhibited dispersion behavior associated with interfacial polarization mechanism and charge carrier hopping. DFT calculations supported the experimental findings and indicated a ferrimagnetic ground state with increased band gap and decreased dielectric constant as the amount of Ni increased. The low dielectric loss of CNF with Ni2+ substitution at higher frequencies makes it a promising candidate for energy-harvesting devices in the electronics industry.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Biochemistry & Molecular Biology
Pedro Simao Sousa Mendonca, Jeziel Rodrigues dos Santos, Osmair Vital de Oliveira, Jose Divino dos Santos, Elson Longo
Summary: Computational chemistry methods were used to study the potential of a silicon nanotube as a virucidal agent against COVID-19. The results showed that the nanotube had high reactivity and favorable binding energy with the receptor-binding domain of the SARS-CoV-2 spike protein.
JOURNAL OF BIOMOLECULAR STRUCTURE & DYNAMICS
(2023)
Article
Engineering, Electrical & Electronic
Isabela C. F. Vaz, Carlos Eugenio Macchi, Alberto Somoza, Leandro S. R. Rocha, Elson Longo, Luis Cabral, Edison Z. da Silva, Alexandre Zirpoli Simoes, Giulia Zonta, Cesare Malagu, P. Mariela Desimone, Miguel Adolfo Ponce, Francisco Moura
Summary: This study explores the electrical properties of Nd-doped cerium oxide films synthesized using microwave assisted hydrothermal method. The increase in Nd content leads to structural disorder and the formation of defective clusters, which results in an increase in conductivity. The films demonstrate fast response time and show potential for gas sensor devices. Ab initio investigations reveal that oxygen vacancies play a fundamental role in enhancing the electrical conduction, mainly due to the presence of reduced Nd2+.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Chemistry, Multidisciplinary
Thaiane Robeldo, Lucas S. Ribeiro, Lida Manrique, Andressa Mayumi Kubo, Elson Longo, Emerson Rodrigues Camargo, Ricardo Carneiro Borra
Summary: Low oxygen concentration in the tumor microenvironment is a major obstacle for photodynamic therapy of malignant tumors. Titanium dioxide (Ti(OH)(4)) shows potential as a photosensitizer for bladder cancer treatment due to its ability to produce high levels of reactive oxygen species (ROS) regardless of oxygen concentrations. In this study, exposure of Ti(OH)(4) to visible light stimulated ROS production and dose-dependently induced necrosis in tumor cells. Ti(OH)(4) also inhibited cell proliferation and migration in low concentrations. Mechanistically, Ti(OH)(4) may initiate type II cell death through autophagic dysfunction mechanisms associated with high ROS production.
Article
Nanoscience & Nanotechnology
Marisa Carvalho de Oliveira, Marcelo Assis, Luiz Gustavo Pagotto Simoes, Daniel Tamassia Minozzi, Renan A. . P. Ribeiro, Juan Andres, Elson Longo
Summary: This research reveals the biocidal activity of SiO2-Ag composites, which can eliminate Staphylococcus aureus and SARS-CoV-2 virus in just 2 minutes. The material destroys the virus structure by generating reactive oxygen species, as predicted by first-principles calculations.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Engineering, Electrical & Electronic
Joao Paulo de Campos da Costa, Leonelio Cichetto Junior, Estacio Paiva de Araujo, Adryelle do Nascimento Arantes, Elson Longo, Adenilson Jose Chiquito, Joao Paulo Carmo
Summary: This article presents the development of a VOC gas sensor based on a PCB multiplexed IDE sensor, highlighting the use of graphite as a sensing material and describing the design and manufacturing of the sensors. Acetone exhibited the highest detection sensitivity, and the sensors maintained stability and repeatability after six months of evaluation.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Physical
Laura O. Libero, Lara K. Ribeiro, Luis I. Granone, Maria S. Churio, Josiane C. Souza, Valmor R. Mastelaro, Juan Andres, Elson Longo, Lucia H. Mascaro, Marcelo Assis
Summary: This study reports on the immobilization of Fe-2(MoO4)(3) in chitosan films and its effect on the oxidation reaction of sulfide derivatives. The catalyst showed good yields and excellent selectivity, even tolerating oxidatively sensitive functional groups. The key success of the selective oxidation was attributed to the presence of hydroxyl radical, center dot OH, and the Fe3+/Fe2+ Fenton-like process. Additionally, the synergistic effect between Fe-2(MoO4)(3) and chitosan was demonstrated in the selective oxidation of sulfides to sulfones. This work provides a design strategy for efficient catalysts that can be applied to other semiconductors and oxidation processes.
Article
Nanoscience & Nanotechnology
Krishtappa Manjunatha, Hsin-Hao Chiu, Ming-Kang Ho, Tsu-En Hsu, Shih-Lung Yu, Chu-En Chin, Chia-Liang Cheng, Marisa Carvalho de Oliveira, Elson Longo, Renan A. P. Ribeiro, Hanumanthappa Nagabhushana, Sheng Yun Wu
Summary: By using the co-precipitate method, Mg-doped CoCr2O4 nanoparticles with controlled particle size were synthesized and their properties were investigated. The magnetic inhomogeneity of the nanoparticles was identified as the cause of the observed exchange bias effect. The nanoparticles showed potential applications in magnetic memory and magnetocaloric effect fields.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
D. C. Amaral, L. S. R. Rocha, L. I. Granone, M. M. Lage, M. S. Churio, M. D. Sanchez, E. Longo, H. M. S. Nascimento, M. Assis, F. Moura, M. A. Ponce
Summary: The influence of manganese modification on the spectroscopic features of manganese-doped CeO2 systems synthesized by the microwave-assisted hydrothermal route and their correlation with the presence of O defective structures were verified. Raman and electron paramagnetic resonance studies confirmed the presence of defective clusters formed by dipoles and/or quadrupoles. The number of paramagnetic species was found to be inversely proportional to the doping concentration, resulting in an increase in the Mn2+ signal, likely due to the reduction of Mn3+ species after the interaction with CO. X-ray photoelectron spectroscopy data showed significant changes in the Ce3+ and Mn2+ configurations with the introduction of manganese modification, suggesting the formation of nonparamagnetic Ce4+ species and the persistence of paramagnetic Mn2+ species.
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Guilhermina Ferreira Teixeira, Heitor Secco Seleghini, Wagner Benicio Bastos, Natalia Jacomaci, Bojan Stojadinovic, Zorana Dohcevic-Mitrovic, Flavio Colmati, Miguel Angel San-Miguel, Elson Longo, Maria Aparecida Zaghete
Summary: Na2Nb2O6•H2O fibers were synthesized using a microwave-assisted hydrothermal method and used as a precursor for obtaining NaNbO3 fibers with piezoelectric characteristics. The NaNbO3 fibers consist of a mix of antiferroelectric and ferroelectric orthorhombic phases. Piezoresponse force microscopy revealed that the fibers have regions with ferroelectric domains and regions with no ferroelectric characteristics.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Chemistry, Inorganic & Nuclear
L. X. Lovisa, T. B. O. Nunes, R. R. Y. O. V. Wilson, E. Longo, M. Daldind, M. R. D. Bomio, F. V. Motta
Summary: This study successfully synthesized zinc-doped Bi2WO6 and demonstrated its good degradation performance for methylene blue through photocatalytic tests. Doping with Zn2+ improved photoluminescence, but excessive Zn2+ concentration inhibited photocatalytic properties.
DALTON TRANSACTIONS
(2022)
Article
Materials Science, Multidisciplinary
Roumanos Georges Dib Neto, Wagner Costa Macedo, Jose Diego Fernandes, Agda Eunice de Souza, Silvio Rainho Teixeira, Kleper de Oliveira Rocha, Elson Longo
Summary: Manganese oxides were synthesized via Microwave-Assisted Hydrothermal (MAH) method and characterized at different temperatures. The analysis results revealed the presence of five distinct phases and the occurrence of oxidation and reduction reactions. The chemical characterization indicated the presence of sodium ions, which can be used as intercalation compounds for energy storage device optimization.
MATERIA-RIO DE JANEIRO
(2022)
Article
Chemistry, Inorganic & Nuclear
Ivo M. Pinatti, Ana C. M. Tello, Paula F. S. Pereira, Aline B. Trench, Marcio D. Teodoro, Ieda L. V. Rosa, Alberico B. F. da Silva, Elson Longo, Juan Andres, Alexandre Z. Simoes
Summary: A systematic study was conducted to investigate the relationship between photoluminescence emissions and photocatalytic activity of Ag2SeO4 obtained by different synthesis methods. Experimental characterization techniques and density functional theory calculations were used to understand its structural order and surface properties. The results showed that the Ag2SeO4 synthesized by the coprecipitation method exhibited the most intense photoluminescence band and the best photocatalytic activity for rhodamine B degradation under UV light irradiation.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Physical
Cristian Dias Fernandes, Mateus Meneghetti Ferrer, Cristiane Wienke Raubach, Eduardo Ceretta Moreira, Luciano Timm Gularte, Sergio da Silva Cava, Pedro Lovato Gomes Jardim, Ramon Dadalto Carvalho, Elson Longo, Mario Lucio Moreira
Summary: ZnO particles grown as ZnO/ZnS(ZC + TAA) photoelectrodes using the microwave-assisted hydrothermal method exhibit excellent photovoltaic parameters, attributed to better charge transfer and resistance to recombination.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
