Efeitos de adições de Cr2O3, NiO e ZnO sobre a formação do clínquer Portland e de adições de Al2O3 e Fe2O3 sobre a decomposição de seu composto majoritário

AUTOR(ES)
DATA DE PUBLICAÇÃO

2005

RESUMO

The co-processing of residues in cement kilns is in current days ones of the main solutions adopted for the final disposal of industrial residues. Part of this work has for objective to determine the effect of additions of Cr2O3, NiO and ZnO on the formation of main composites of the Portland cement clinker, aiming at to the co-processing of industrial residues that contain metals chromium, nickel or zinc, considered of difficult disposal. In this direction, a synthetic raw meal was prepared that later suffered additions from interest oxides. The raw meal samples, pure and with additions, had been prepared in way to reproduce the industrial clinkering process. Differential thermal analysis, thermogravimetry, scanning eletron microscopy, spectrometry of dispersion in wavelength and X rays diffraction, associate to the Rietveld method, had been used for characterization of the samples of flour and clinker. The results allow to conclude that additions of oxides up to 1% in mass do not cause significant alterations in clinker. Such fact signals positively for the co-processing of residues that contain metals chromium, nickel or zinc. One second part of the work has for objective to determine the effect of the oxides Al2O3 and Fe2O3 on the decomposition of tricalcium silicate, the major component of Portland clinker. In this direction, CCT diagrams for the decomposition of this compoud were constructed, allowing the quantification the oxides effects.

ASSUNTO(S)

cromo níquel zinco cimento portland engenharia de materiais e metalurgica coprocessamento de resíduos

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