Avaliação de um potencial reaproveitamento para o resíduo de escória de uma empresa de fundição de ferro para a indústria concreteira

Abstract

The foundry company generates several types of solid waste, among them are: sand, slag and refractory casting that when improperly arranged in direct contact with nature can cause various problems. Among the most common environmental damage are contamination of soil, air and water (surface and groundwater). The casting slag is generated in the metal fusion process formed mainly by dirt adhered to the raw material. The industrial landfill cannot be the only option for the disposal of this waste, and thus, of great importance the development of applied studies aimed at the reuse of these residues as raw material for other processes. The construction industry has the potential for the use of this waste with the use of smelting slag in processes such as: concrete manufacturing, paving, landfill ing and civil construction in general. Thus, the objective of this course completion work was to analyze the casting slag residue and evaluate a possibility of destination. The methodology consisted of the analysis of chemical, physical and environmental composition, as well as the diagnosis of the generation stages. The results showed that the processing of the residue in fineness 12.5mm has a 56% pozolanic activity index, the test for compressive strength resulted in 11.10MPa in the mixture (cement plus residue) compared with pure cement of 19.98 MPa. While the X-ray diffraction test showed us that 76.5% is amorphism being a residue without defined form and can be an excellent potential of hydraulic binder. The results obtained do not yet allow establishing a safe destination, but the characterization of the residue analyzed shows that it has potential for reuse, however, additional studies are necessary for a sustainable destination, such as substitution to raw materials in the cement industry