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Papers by Francesco Memoli

Research paper thumbnail of The behaviour of the secondary metallurgy slag into the EAF. How to create a good foamy slag with the appropriate basicity using a mix of lime and recycled ladle slag as EAF slag former

Several steel plants, in Italy and in the rest of Europe, recycle with different methods and tech... more Several steel plants, in Italy and in the rest of Europe, recycle with different methods and techniques the slag proceeding from the secondary metallurgy as slag former for their Electric Arc Furnaces. In this paper the excellent results of this non-standard practice are analysed and related to the characteristics of the EAF-slag resulting from this recycling. An interesting effect has been found on the characteristics of foaming velocity, slag basicity and slag density. Slag foaming studies were conducted in the laboratories of UNSW (Sydney, Australia) using the high temperature visualization facility. The studies have established the differences in the slag foaming phenomenon between the electric arc furnace slag formed with usual components (lime, dololime, etc.) and the slag formed with the non-standard mix (lime and recycled ladle slag). Using a model of isothermal solubility, developed by Politecnico di Milano University (Italy), the other EAF slag properties, in particular th...

Research paper thumbnail of Evaluation of the Energy Developed by a Multipoint Side-wall Burner-Injection System during the Refining Period in a EAF

Isij International, 2004

Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal co... more Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal composition and temperature during the process of oxidation within an EAF system equipped by multi-burner injection system in which the injectors are distributed along the ...

Research paper thumbnail of Method and Apparatus for the Recovery of the Secondary Metallurgy (LF) Slag and Its Recycling in the Steel Production Process by Means of Electric Furnace

Research paper thumbnail of Method and apparatus for the recovery of refractory debris materials and ladle slags as process slags in iron metallurgy producton in eafs, and the related metering to the furnace for the formation of the process slag

Research paper thumbnail of Method and apparatus for the recovery of refractory debris materials and ladle slags as process slags in iron metallurgy production in EAFs, and the related metering to the furnace for the formation of the process slag

Research paper thumbnail of The behaviour of the secondary metallurgy slag into the EAF. How to create a good foamy slag with the appropriate basicity using a mix of lime and recycled ladle slag as EAF slag former

Several steel plants, in Italy and in the rest of Europe, recycle with different methods and tech... more Several steel plants, in Italy and in the rest of Europe, recycle with different methods and techniques the slag proceeding from the secondary metallurgy as slag former for their Electric Arc Furnaces. In this paper the excellent results of this non-standard practice are analysed and related to the characteristics of the EAF-slag resulting from this recycling. An interesting effect has been found on the characteristics of foaming velocity, slag basicity and slag density. Slag foaming studies were conducted in the laboratories of UNSW (Sydney, Australia) using the high temperature visualization facility. The studies have established the differences in the slag foaming phenomenon between the electric arc furnace slag formed with usual components (lime, dololime, etc.) and the slag formed with the non-standard mix (lime and recycled ladle slag). Using a model of isothermal solubility, developed by Politecnico di Milano University (Italy), the other EAF slag properties, in particular th...

Research paper thumbnail of EAF process optimization based on continuous analysis of off-gases and real-time control of chenical package parameters: the case of TAMSA

Techint Goodfellow Technologies (formerly Stantec) implemented their Goodfellow EFSOP™ system at ... more Techint Goodfellow Technologies (formerly Stantec) implemented their Goodfellow EFSOP™ system at Tubos de Acero de Mexico, SA (TAMSA) in late 2002. The technology was used to optimize the use of chemical energy within the electric arc furnace (EAF). The project was a success providing TAMSA a 4.4% reduction in conversion costs (oxygen, methane, electricity and carbon) and a reduction of 1 minute in power-on-time. Subsequently, in late 2003, Techint installed and commissioned their KT-Chemical package at TAMSA. The Goodfellow EFSOP™ system was again used to optimize chemical energy usage within the EAF. The Goodfellow Expert Furnace System Optimization Process (Goodfellow EFSOP™) is a proprietary process that uses continuous off-gas analysis, along with process monitoring to optimize the use of chemical energy within the electric arc furnace (EAF). Optimization is achieved by adjustments to the electric furnace process (carbon charge practice, injected carbon, methane and oxygen), ac...

Research paper thumbnail of Aumento Das Plantas Consteel® No Mundo: Flexibilidade Para a Carga Contínua De Gusa Líquido e Sucata No Forno Elétrico a Arco Agora Na Siderurgia Brasileira

Tecnologia em Metalurgia e Materiais, 2009

Este trabalho descreve as últimas grandes aplicações do Consteel ® ao redor do mundo e as perspec... more Este trabalho descreve as últimas grandes aplicações do Consteel ® ao redor do mundo e as perspectivas de utilização dessa reconhecida tecnologia na retomada do crescimento da siderurgia brasileira, com atenção especial à utilização de gusa líquido como parte principal da carga no forno. O processo FEA Consteel ® representa a extensão das vantagens do processo de carga e fundição contínuas -típico em FEAs carregados com 100% DRI -para o carregamento de sucata. Isto promove o benefício adicional de um pré-aquecimento da carga "ambientalmente amigável", que ajuda a reduzir os requisitos de energia do processo. Ainda a possibilidade de injetar oxigênio em 100% do tempo de forno ligado faz do processo Consteel ® a melhor opção para extrair o máximo de vantagens da carga de gusa líquido em um FEA. São descritos também detalhes do processo e peculiaridades tecnológicas desse tipo particular de operação.

Research paper thumbnail of Recycling of ladle slag in the EAF: improvement of the foaming behavior and decrease of the environmental impact

Revue de Métallurgie, 2007

ABSTRACT Recycling the ladle furnace slags is a key issue for environment. These slags can lose t... more ABSTRACT Recycling the ladle furnace slags is a key issue for environment. These slags can lose their compact structure and assume a powdered form as a result of interactions between the solidified slag constituents and the atmosphere humidity. The powders of the slag can increase the concentration of particulates in the atmosphere near the steelmaking plant and this implies the adoption of complex and expensive procedures for storage. A new technique to manage this problem has been designed by the Techint Meltshop Division that consists in the recycling of the ladle slag within the electric arc furnace (EAF) through the injection system. The dilution of the chemical species contained in the slag and their combination with the species featuring the EAF slag afford a double advantage: the final slag is structured by chemical species that do not lead to the formation of the powders and better stabilize the foaming slag. The results obtained through the observations developed on the industrial trials have been discussed through the measurements performed by the identification of the chemical species and the result of the thermodynamic modelling.

Research paper thumbnail of Simulation of Oxygen Penetration and Decarburisation in EAF Using Supersonic Injection System

ISIJ International, 2004

Résumé/Abstract The supersonic jet generated by a Laval nozzle in air or in steel has been modell... more Résumé/Abstract The supersonic jet generated by a Laval nozzle in air or in steel has been modelled to vary degrees of complexity and with different goals. 1, 2) This paper describes the application of our model to an injection system based on fixed lances, placed in the ...

Research paper thumbnail of Evaluation of the Energy Developed by a Multipoint Side-wall Burner-Injection System during the Refining Period in a EAF

ISIJ International, 2004

Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal co... more Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal composition and temperature during the process of oxidation within an EAF system equipped by multi-burner injection system in which the injectors are distributed along the ...

Research paper thumbnail of Multifunction injector and relative combustion process for metallurgical treatment in an electric arc furnace

Research paper thumbnail of The behaviour of the secondary metallurgy slag into the EAF. How to create a good foamy slag with the appropriate basicity using a mix of lime and recycled ladle slag as EAF slag former

Several steel plants, in Italy and in the rest of Europe, recycle with different methods and tech... more Several steel plants, in Italy and in the rest of Europe, recycle with different methods and techniques the slag proceeding from the secondary metallurgy as slag former for their Electric Arc Furnaces. In this paper the excellent results of this non-standard practice are analysed and related to the characteristics of the EAF-slag resulting from this recycling. An interesting effect has been found on the characteristics of foaming velocity, slag basicity and slag density. Slag foaming studies were conducted in the laboratories of UNSW (Sydney, Australia) using the high temperature visualization facility. The studies have established the differences in the slag foaming phenomenon between the electric arc furnace slag formed with usual components (lime, dololime, etc.) and the slag formed with the non-standard mix (lime and recycled ladle slag). Using a model of isothermal solubility, developed by Politecnico di Milano University (Italy), the other EAF slag properties, in particular th...

Research paper thumbnail of Evaluation of the Energy Developed by a Multipoint Side-wall Burner-Injection System during the Refining Period in a EAF

Isij International, 2004

Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal co... more Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal composition and temperature during the process of oxidation within an EAF system equipped by multi-burner injection system in which the injectors are distributed along the ...

Research paper thumbnail of Method and Apparatus for the Recovery of the Secondary Metallurgy (LF) Slag and Its Recycling in the Steel Production Process by Means of Electric Furnace

Research paper thumbnail of Method and apparatus for the recovery of refractory debris materials and ladle slags as process slags in iron metallurgy producton in eafs, and the related metering to the furnace for the formation of the process slag

Research paper thumbnail of Method and apparatus for the recovery of refractory debris materials and ladle slags as process slags in iron metallurgy production in EAFs, and the related metering to the furnace for the formation of the process slag

Research paper thumbnail of The behaviour of the secondary metallurgy slag into the EAF. How to create a good foamy slag with the appropriate basicity using a mix of lime and recycled ladle slag as EAF slag former

Several steel plants, in Italy and in the rest of Europe, recycle with different methods and tech... more Several steel plants, in Italy and in the rest of Europe, recycle with different methods and techniques the slag proceeding from the secondary metallurgy as slag former for their Electric Arc Furnaces. In this paper the excellent results of this non-standard practice are analysed and related to the characteristics of the EAF-slag resulting from this recycling. An interesting effect has been found on the characteristics of foaming velocity, slag basicity and slag density. Slag foaming studies were conducted in the laboratories of UNSW (Sydney, Australia) using the high temperature visualization facility. The studies have established the differences in the slag foaming phenomenon between the electric arc furnace slag formed with usual components (lime, dololime, etc.) and the slag formed with the non-standard mix (lime and recycled ladle slag). Using a model of isothermal solubility, developed by Politecnico di Milano University (Italy), the other EAF slag properties, in particular th...

Research paper thumbnail of EAF process optimization based on continuous analysis of off-gases and real-time control of chenical package parameters: the case of TAMSA

Techint Goodfellow Technologies (formerly Stantec) implemented their Goodfellow EFSOP™ system at ... more Techint Goodfellow Technologies (formerly Stantec) implemented their Goodfellow EFSOP™ system at Tubos de Acero de Mexico, SA (TAMSA) in late 2002. The technology was used to optimize the use of chemical energy within the electric arc furnace (EAF). The project was a success providing TAMSA a 4.4% reduction in conversion costs (oxygen, methane, electricity and carbon) and a reduction of 1 minute in power-on-time. Subsequently, in late 2003, Techint installed and commissioned their KT-Chemical package at TAMSA. The Goodfellow EFSOP™ system was again used to optimize chemical energy usage within the EAF. The Goodfellow Expert Furnace System Optimization Process (Goodfellow EFSOP™) is a proprietary process that uses continuous off-gas analysis, along with process monitoring to optimize the use of chemical energy within the electric arc furnace (EAF). Optimization is achieved by adjustments to the electric furnace process (carbon charge practice, injected carbon, methane and oxygen), ac...

Research paper thumbnail of Aumento Das Plantas Consteel® No Mundo: Flexibilidade Para a Carga Contínua De Gusa Líquido e Sucata No Forno Elétrico a Arco Agora Na Siderurgia Brasileira

Tecnologia em Metalurgia e Materiais, 2009

Este trabalho descreve as últimas grandes aplicações do Consteel ® ao redor do mundo e as perspec... more Este trabalho descreve as últimas grandes aplicações do Consteel ® ao redor do mundo e as perspectivas de utilização dessa reconhecida tecnologia na retomada do crescimento da siderurgia brasileira, com atenção especial à utilização de gusa líquido como parte principal da carga no forno. O processo FEA Consteel ® representa a extensão das vantagens do processo de carga e fundição contínuas -típico em FEAs carregados com 100% DRI -para o carregamento de sucata. Isto promove o benefício adicional de um pré-aquecimento da carga "ambientalmente amigável", que ajuda a reduzir os requisitos de energia do processo. Ainda a possibilidade de injetar oxigênio em 100% do tempo de forno ligado faz do processo Consteel ® a melhor opção para extrair o máximo de vantagens da carga de gusa líquido em um FEA. São descritos também detalhes do processo e peculiaridades tecnológicas desse tipo particular de operação.

Research paper thumbnail of Recycling of ladle slag in the EAF: improvement of the foaming behavior and decrease of the environmental impact

Revue de Métallurgie, 2007

ABSTRACT Recycling the ladle furnace slags is a key issue for environment. These slags can lose t... more ABSTRACT Recycling the ladle furnace slags is a key issue for environment. These slags can lose their compact structure and assume a powdered form as a result of interactions between the solidified slag constituents and the atmosphere humidity. The powders of the slag can increase the concentration of particulates in the atmosphere near the steelmaking plant and this implies the adoption of complex and expensive procedures for storage. A new technique to manage this problem has been designed by the Techint Meltshop Division that consists in the recycling of the ladle slag within the electric arc furnace (EAF) through the injection system. The dilution of the chemical species contained in the slag and their combination with the species featuring the EAF slag afford a double advantage: the final slag is structured by chemical species that do not lead to the formation of the powders and better stabilize the foaming slag. The results obtained through the observations developed on the industrial trials have been discussed through the measurements performed by the identification of the chemical species and the result of the thermodynamic modelling.

Research paper thumbnail of Simulation of Oxygen Penetration and Decarburisation in EAF Using Supersonic Injection System

ISIJ International, 2004

Résumé/Abstract The supersonic jet generated by a Laval nozzle in air or in steel has been modell... more Résumé/Abstract The supersonic jet generated by a Laval nozzle in air or in steel has been modelled to vary degrees of complexity and with different goals. 1, 2) This paper describes the application of our model to an injection system based on fixed lances, placed in the ...

Research paper thumbnail of Evaluation of the Energy Developed by a Multipoint Side-wall Burner-Injection System during the Refining Period in a EAF

ISIJ International, 2004

Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal co... more Résumé/Abstract An experimental activity has been performed to monitor the trend in slag-metal composition and temperature during the process of oxidation within an EAF system equipped by multi-burner injection system in which the injectors are distributed along the ...

Research paper thumbnail of Multifunction injector and relative combustion process for metallurgical treatment in an electric arc furnace