Mill scale waste from steelmaking industry as raw material for reddish clayey ceramic production

Referencia Apresentador Autores
Carlos Mauricio Fontes Vieira Lopes, H.J.(Universidade Estadual do Norte Fluminense Darcy Ribeiro); Amaral, L.F.(Universidade Estadual Norte Fluminense Darcy Ribeiro); Vieira, C.M.(Universidade Estadual do Norte Fluminense Darcy Ribeiro); The steelmaking industry generates a diversity of solid wastes, liquid effluents and gaseous emissions. With regard to solid waste, it can be highlighted the slag, dust, sludge and mill scale. The mill scale is a waste formed at the final stages of the steelmaking process. In Brazil, the production of this waste can reach 245 thousand tons per year. The majority of what is produced is also reused in the steel process, but a part is discarded. The reuse of mill scale in other production processes, besides the environmental impact reduction, it may contribute to the economy of steelmaking industry. In this way, the aim of this work was to investigate the possibility of using mill scale as a raw material for the red ceramic industry. For this purpose, the raw materials used were a clayey body containing a mixture of 25% of reddish clay from Itaboraí and 75% of yellow clay from Campos dos Goytacazes, and the mill scale waste from the steel production, which was collected in the ArcelorMittal Tubarão industry. The residue was added in the clayey body in percentages of 0%, 2.5%, 5%, 10% and 20% by weight. The specimens were produced by extrusion and sintered at 850 °C, 950 °C and 1050 °C. The physical and mechanical properties evaluated were: linear shrinkage, water absorption and three bending point test. The results showed that this waste changes the properties of ceramics leading to a greater densification, reduction of water absorption and increase of mechanical resistance with contents of up to 10%. Therefore, it was demonstrated the feasibility of the mill scale’s utilization as raw materials for red ceramics production, since it was able to improve the physical and mechanical properties of the specimens.
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