UTILIZATION OF WASTE FROM TiO2 PRODUCTION FOR PORTLAND CEMENT`S OBTENTION

Reference Presenter Authors
(Institution)
Abstract
04-032 José da Silva Andrade Neto Mariani, B.B.(Universidade Federal da Bahia); Andrade Neto, J.d.(Federal University of Bahia); Amorim Júnior, N.S.(Federal University of Bahia); RIBEIRO, D.V.(Federal University of Bahia); Cement, the building material most consumed worldwide, has a high environmental impact on its production, liberating a high amount of CO2, besides a high consume of energy. Thus, studies that seek alternatives for the more sustainable production of cement are essential. In this context, the practice of co-processing has proved to be an environmentally and economically attractive alternative for the cement industry, which has long search for procedures that effectively reduce the energy consumption and the CO2 emission generated during the production of clinker. In this way, the objective of this paper was to evaluate the properties of the cements produced from clinkers co-processed with unreacted ore (URO), a waste from TiO2 production. It was evaluated four different cements produced from different raw meals, with the lime saturation factor (LSF) set at 98%, varying the content of incorporated TiO2 in 0% (reference), 0.5%, 1.0% and 2.0%. The raw meals were calcined at 1340°C and the resulting clinkers were mixed and ground with gypsum, resulting, thus, in the cements. The produced cements and a CP V ARI RS, commercially available in the metropolitan region of Salvador, were, then, characterized physically, chemically and mineralogically. Then, the performance of these cements was evaluated through chemical shrinkage (dilatometry), expandability using the Le Chatelier needles and compressive strength at 3, 7 and 28 days. It was possible to obtain cements with up to 2.6% of URO (1.0% of TiO2) with properties within the normative limits. The incorporation up to 2.6% of URO favored the formation of C3S and the compressive strength development. The experiments evidenced the potential use of this waste, which presents mineralizing effect, allowing the URO to become product with added value.
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