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Murat Tunc - One of the best experts on this subject based on the ideXlab platform.

  • mass analysis of an Electric Arc Furnace eaf at a steel company in turkey
    Metallurgist, 2012
    Co-Authors: Murat Tunc, Ünal ̈ Çamdali, G Arasil
    Abstract:

    The production of steel of desired composition is realized as a result of bringing some of the elements to the desired amounts after a series of chemical reactions occurring at different velocities between the elements or compounds at high temperatures and adding alloy materials for the other elements needed in the composition. The steel production process in an Electric Arc Furnace can be defined in the following order: scrap charge, melting, oxidation, reduction, alloying, deoxidization, casting, and preparation of the Furnace. In this study, a mass analysis is accomplished for an Electric Arc Furnace at a steel company in Turkey. In order to make the mass balance, firstly all materials that are entering the system are calculated on a chemical component basis. The necessary information was provided from an iron and steel producing company. The results of the mass analysis are presented at the end of the study.

  • Computation of Chemical Exergy Potential in an Industrial AC Electric Arc Furnace
    Journal of Energy Resources Technology, 2005
    Co-Authors: Ünal Çamdali, Murat Tunc
    Abstract:

    Chemical exergy is equal to the maximum amount of work obtainable when the substance is brought from the environmental state to the dead state by a process involving heat transfer and exchange of substances only with the environment. As it is well known the iron and steel industry is the largest industrial energy consumer. After the employee costs, energy costs (about 30% of the total) represent the second highest cost element in integrated steel works. In this study, the chemical exergy potential in an Electric Arc Furnace (EAF) is calculated and these potentials are distributed depending on production materials, emphasizing the chemical exergy concept.

  • Second law analysis of thermodynamics in the Electric Arc Furnace at a steel producing company
    Energy Conversion and Management, 2003
    Co-Authors: Ünal ̈ Çamdali, Murat Tunc, Ahmet Karakas
    Abstract:

    In this study, energy and conservation analyses are applied to the production of steel process in the Electric Arc Furnace. The scrap pre-heating system, stack gas and cooling water leaving the Furnace are investigated, and the obtained results are compared with experimental ones.

  • Exergy analysis and efficiency in an industrial AC Electric Arc Furnace
    Applied Thermal Engineering, 2003
    Co-Authors: Ünal ̈ Çamdali, Murat Tunc
    Abstract:

    Abstract In this study, the steel production process in the AC Electric Arc Furnace (EAF) is discussed and an exergy analysis has been undertaken for the EAF with scrap preheating for an alloyed steel producer in Turkey. Exergy analysis has been employed to obtain optimum design parameters and operation conditions. In this work; obtained results are compared with measured values and previous literature.

Ünal ̈ Çamdali - One of the best experts on this subject based on the ideXlab platform.

  • mass analysis of an Electric Arc Furnace eaf at a steel company in turkey
    Metallurgist, 2012
    Co-Authors: Murat Tunc, Ünal ̈ Çamdali, G Arasil
    Abstract:

    The production of steel of desired composition is realized as a result of bringing some of the elements to the desired amounts after a series of chemical reactions occurring at different velocities between the elements or compounds at high temperatures and adding alloy materials for the other elements needed in the composition. The steel production process in an Electric Arc Furnace can be defined in the following order: scrap charge, melting, oxidation, reduction, alloying, deoxidization, casting, and preparation of the Furnace. In this study, a mass analysis is accomplished for an Electric Arc Furnace at a steel company in Turkey. In order to make the mass balance, firstly all materials that are entering the system are calculated on a chemical component basis. The necessary information was provided from an iron and steel producing company. The results of the mass analysis are presented at the end of the study.

  • Second law analysis of thermodynamics in the Electric Arc Furnace at a steel producing company
    Energy Conversion and Management, 2003
    Co-Authors: Ünal ̈ Çamdali, Murat Tunc, Ahmet Karakas
    Abstract:

    In this study, energy and conservation analyses are applied to the production of steel process in the Electric Arc Furnace. The scrap pre-heating system, stack gas and cooling water leaving the Furnace are investigated, and the obtained results are compared with experimental ones.

  • Exergy analysis and efficiency in an industrial AC Electric Arc Furnace
    Applied Thermal Engineering, 2003
    Co-Authors: Ünal ̈ Çamdali, Murat Tunc
    Abstract:

    Abstract In this study, the steel production process in the AC Electric Arc Furnace (EAF) is discussed and an exergy analysis has been undertaken for the EAF with scrap preheating for an alloyed steel producer in Turkey. Exergy analysis has been employed to obtain optimum design parameters and operation conditions. In this work; obtained results are compared with measured values and previous literature.

Katya Brunelli - One of the best experts on this subject based on the ideXlab platform.

  • Dimensional stability of Electric Arc Furnace slag in civil engineering applications
    Journal of Cleaner Production, 2018
    Co-Authors: Amaia Santamaría, Flora Faleschini, Katya Brunelli, Carlo Pellegrino, Giovanni Giacomello, José-tomás San José, Marco Pasetto
    Abstract:

    Abstract Dimensional stability of manufactured aggregates represents a matter of interest for many applications in civil engineering. Past results evidenced how steel slag might be affected by potential swelling, due to several concurring causes linked to the presence of free lime and periclase in their chemical composition. In this work, a detailed analysis about physical and chemical properties of Electric Arc Furnace slag (EAFS) is developed, using thermogravimetry, scanning electron microscopy, X-ray diffraction and porosity analysis. The efficiency of a commonly used method for slag treatment on reducing its swelling-potential is also experimentally assessed and confirmed, through expansion tests carried out in an experimental apparatus developed specifically for this scope, based on steam diffusion within the test sample. Lastly, a maximum allowable limit for slag swelling is proposed for some applications of interest.

  • Cementing efficiency of Electric Arc Furnace dust in mortars
    Construction and Building Materials, 2017
    Co-Authors: Margareth Da Silva Magalhães, Flora Faleschini, Carlo Pellegrino, Katya Brunelli
    Abstract:

    The aim of this study is to evaluate the cementing efficiency (k-value) of an Electric Arc Furnace dust (EAFD), used in as-received conditions, as a supplementary cementing material (SCM). The investigated variables are the amount of EAFD in the mix, water/binder ratio and curing age. Fifteen mixtures are manufactured to estimate the k-values, both considering compressive and flexural strength. In both cases, k-values depend on replacement percentage, and decrease raising the EAFD content in the mix. Water/binder ratio and hydration time significantly influence EAFD efficiency, too. Additionally, results show that flexural k-values are greater than compressive k-values in the analyzed mortars.

  • high performance concrete with Electric Arc Furnace slag as aggregate mechanical and durability properties
    Construction and Building Materials, 2015
    Co-Authors: Flora Faleschini, Katya Brunelli, Carlo Pellegrino, Alejandro M Fernandezruiz, Mariano Angelo Zanini, Enrique Hernandezmontes
    Abstract:

    Abstract This paper investigates the feasibility of using Black/Oxidizing Electric Arc Furnace slag (EAF) as coarse aggregate to produce High Performance Concrete (HPC). Various experimental mixes have been produced, fully replacing natural coarse aggregates with EAF slag, varying the cement dosages and the water/cement ratios, and they have been characterized through a mechanical and microstructural campaign. For some mixtures also durability has been evaluated, through a study about chloride ingress into concrete matrix. Results indicate that the use of EAF slag improves concrete strength and durability, reaching C60/75 strength class without using any mineral additions and maintaining relatively high water/cement ratio.

  • properties of concretes with black oxidizing Electric Arc Furnace slag aggregate
    Cement & Concrete Composites, 2013
    Co-Authors: Carlo Pellegrino, Flora Faleschini, Paolo Cavagnis, Katya Brunelli
    Abstract:

    Abstract The aim of this work is to comprehensively investigate the possibility of partially substituting natural aggregates with Black/Oxidizing Electric Arc Furnace (EAF) slag in concrete production. Five recycled and one traditional mixes were produced to identify a convenient substitution ratio for the concrete. Main physical and mechanical properties of concrete containing EAF slag as aggregate according to Fuller’s grading curve were experimentally investigated. Chemical and durability tests were performed to study the microstructure and analyse the behaviour of the conglomerate exposed to detrimental agents. Results showed that high substitution ratios of coarse natural aggregates are possible without decreasing mechanical properties of concrete. Conversely, replacement of fine natural aggregates with recycled ones seems feasible at lower substitution ratios only. Presence of calcium and magnesium oxides in the slag does not seem to represent a limit for the durability of concrete, due to their stabilization in crystalline lattice.

D Venkateswaran - One of the best experts on this subject based on the ideXlab platform.

  • cementitious and pozzolanic behavior of Electric Arc Furnace steel slags
    Cement and Concrete Research, 2009
    Co-Authors: Luckman Muhmood, Satish Vitta, D Venkateswaran
    Abstract:

    The cementitious and pozzolanic behavior of Electric Arc Furnace steel slag, both as received and treated has been studied in detail. The as received slag was completely crystalline and multi-phasic with Fe-substituted monticellite as the predominant phase. Treatment of this slag, remelting and water quenching, results in reduction of Fe-oxide content coupled with an increase in basicity index which makes it more hydraulic compared to the as received slag. The remelted slag has several phases with merwinite as the dominant phase. Thermal analysis of the hydrated slag shows that treating the as received slag increases the water absorption capacity, a property essential for cementitious behavior. Compression strength of the slag blended cements was studied and it was found that substitution of 20% ground granulated blast Furnace slag with Electric Arc Furnace steel slag does not decrease the strength beyond 28 days. The control cement has a strength of 58.6 MPa compared to 58 MPa for the cement comprising of 20% untreated slag. The substitution of this untreated slag with treated slag exhibits the highest strength, 61 MPa and a potential for further strength increase after 28 days. In the case of cement mix with no blast Furnace slag, substitution of 15% clinker with steel slag does not decrease the strength significantly, 64.4 MPa compared to 66.5 MPa for the control cement. Substituting 30% clinker in the cement mix with Electric Arc Furnace slag however results in significant decrease in strength, 53.4 MPa. The pozzolanic strength of the slag was found to increase significantly due to remelting from 2.0 MPa for the as received slag to 8.0 MPa for the treated slag.

Asunci??n Santamaria - One of the best experts on this subject based on the ideXlab platform.

  • self compacting concrete incorporating Electric Arc Furnace steelmaking slag as aggregate
    Materials & Design, 2017
    Co-Authors: Asunci??n Santamaria, A Orbe, M M Losanez, Marta Skaf, Vanesa Ortegalopez, Javier Gonzalez
    Abstract:

    Abstract Electric Arc-Furnace slag (EAFS) is an industrial by-product that can be employed in hydraulic mixes used in the field of construction and civil engineering. The design and preparation of self-compacting mixes with this aggregate is a challenge, due to the loss of workability that always accompanies its use in concrete. Only through careful design of the characteristics and proportions of the components in each mixture will an acceptable workability be achieved. Thus, criteria and methods are proposed in this paper for successful preparation of these types of mixtures. Several concrete mixes are manufactured to obtain self-compaction characteristics and their main properties are analyzed with regard to their use as structural concrete. Electron microscopy observations and dispersive energy analysis are used to study the microstructural features of these mixes. Finally, a numerical simulation is proposed as a useful method that estimates the viscous properties of the mixes and their workability, based on the dosage and the characteristics of their components.

  • Electric Arc Furnace slag and its use in hydraulic concrete
    Construction and Building Materials, 2015
    Co-Authors: Idoia Arribas, Asunci??n Santamaria, Estela Ruiz, Vanesa Ortega-lópez, Juan Manuel Manso
    Abstract:

    Electric Arc Furnace oxidizing slag (EAFS) is a by-product of the steelmaking industry, generated after the melting and the preliminary acid refining of liquid steel. It is a stony material that is easy to crush for use as aggregate in concrete mixes. This study examines the long-term aging reactions of EAFS and its volumetric stability, to gain further knowledge of this by-product, its behaviour as a construction material, and its inherent risk of swelling. Additionally, the good compressive strength of hydraulic mixes that incorporate this slag can be analyzed and explained on the basis of its steady and expansive compounds and its chemical evolution over time in the interfacial transition zone (ITZ); the appearance of calcium carbonate enhances the cohesiveness, stiffness and strength of this zone and, as a consequence, of the hydraulic concrete.