| CHARACTERIZATION OF BRAZILIAN LD SLUDGES Mery-cecilia Gomez Marroquin1; Jose Carlos D'abreu2; 1NATIONAL UNIVERSITY OF ENGINEERING, Lima, Peru; 2PUC-RIO, Rio de Janeiro, Brazil; PAPER: 158/Iron/Regular (Oral) SCHEDULED: 12:45/Wed. 30 Nov. 2022/Arcadia 1 ABSTRACT: Carbothermic reduction of fine steel sludge (FSS-LD) and coarse steel sludge (CSS-LD) occured from Linz Donawitz steelworks in a Brazilian semi-integrated steel plant. These processes were carried out prior to characterization, for which, they determined high levels of iron content (51.54 - 77.53%) and zinc content (0.49 - 1.69%), as well as, a little specific carbon content (0.0215 - 0.0350%). Morphology shown by these residues are made up of globular aggregates of metallic iron intergrown with crystals of iron oxides and zinc oxide with particle sizes between 0.12- and 0.15-mm observable through a Scanning Electron Microscope (SEM). Thermal characterization via DTG-DSC-TG at 1000°C prior to carbothermic reduction Mass losses of 92.57% were observed for the FSS - LD sample and 97.43% for the CSS - LD sample References: [1] Drobíková, K., Plachá, D., Motyka, O., Gabor, R., Kutláková, K. M., Vallová, S., & Seidlerová, J. (2016). Recycling of blast furnace sludge by briquetting with starch binder: waste gas from thermal treatment utilizable as a fuel. Waste management, 48, 471-477. [2] Purohit, A., Swain, P. T. R., & Patnaik, P. K. (2020) Mechanical and sliding wear characterization of LD sludge filled hybrid composites. Materials Today: Proceedings. [3] Das B, Prakash S, Reddy PSR, Misra VN (2007) An overview of utilization of slag and sludge from steel industries. Resources, Conservation and Recycling. 2007; 50: 40-57. [4] Cantarino Marcos Vinicius (2011). Estudo da remoção de zinco e de álcalis contidos em lamas de aciaria LD. Dissertação de Mestrado apresentada ao Curso de Pós-Graduação em Engenharia Metalúrgica e de Minas da Universidade Federal de Minas Gerais. Orientador: Prof. Marcelo Borges Mansur, 2011. [5] Kusinski, J., Jasienska, S., & Monty, C. (1994). Microstructural and microanalytical examinations of partially reduced doped wustites. Solid state ionics, 68(3-4), 185-192. [6] Maggi, F., Dossi, S., Paravan, C., Galfetti, L., Rota, R., Cianfanelli, S., & Marra, G. (2019). Iron oxide as solid propellant catalyst: A detailed characterization. Acta Astronautica, 158, 416-424. [7] Jalkanen, H., & Holappa, L. (2014). Converter steelmaking. In Treatise on process metallurgy (pp. 223-270). Elsevier. DOI: [8] Gómez-Marroquín, M. C.; Salazar-Yantas K. A. Tinoco-Falero J. A.; Infante-Rojas M. D. (2018) Characterization of coarse and fine residues from a sludge site of an integrated steel plant in Peru. Iron and Steel Technology Conference and Exposition AISTech 2018. Volume 2018-May, 2018, 951-957 [9] Gómez-Marroquin, Mery C.; D'Abreu, J. C. (2017) Characterization of Peruvian Linz Donawitz-LD Steel Sludges. SIPS 2017-Sustainable Industrial Processing Summit & Exhibition, Cancun-México 2017. |
