EVALUATION OF THE RESIDUE INFLUENCE FROM THE PRODUCTION OF TITANIUM DIOXIDE (URM) IN THE HYDRATION OF MIXED PASTURES OF PORTLAND CEMENT AND HYDRATED CAL

Reference Presenter Authors
(Institution)
Abstract
04-025 José da Silva Andrade Neto Albuquerque, D.M.(Federal University of Bahia); Andrade Neto, J.d.(Federal University of Bahia); Amorim Júnior, N.S.(Federal University of Bahia); RIBEIRO, D.V.(Federal University of Bahia); The Industrial Revolution and, consequently, the systematization of the productive pro-cesses, combined with the population growth, caused an increase of the consumption in the whole world, generating, through the productive systems, a considerable in-crease in the amount of waste. Thus, the pressure on finding solutions for the correct use and disposal of waste is increasing, stimulating studies that seek alternatives for its application in the most diverse areas. The construction industry presents great poten-tial for the reuse of these residues, through the incorporation of the same ones in ce-ment matrices. In this context, unreacted ore (URM), a waste generated in the produc-tion of titanium dioxide, still does not present a policy of reuse and recycling in an ef-fective way, and is currently disposed in a controlled landfill. Thus, the present study analyzes the influence of the addition of URM on the hydration of mixed slurries of white Portland cement and lime. After the physical, chemical and mineralogical char-acterization of URM, cement and lime, reference pastes (0% of URM) were molded and 5%, 10% and 15% URM additions were added to the cement mass. The hydrates of these pulps were analyzed through the setting time test (Vicat and Calorimetry meth-ods), X-ray diffraction (XRD) and Thermogravimetry (TG/DTG). The results obtained in this research indicate that the addition of MNR provides a delay in initial and final set-ting time, and a lower release of heat during the hydration process of these pastes.
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