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REM - International Engineering Journal

versão On-line ISSN 2448-167X

Resumo

ALVES, Joner Oliveira et al. Characterization of mineral wools obtained from ornamental rock wastes. REM, Int. Eng. J. [online]. 2018, vol.71, n.3, pp.425-429. ISSN 2448-167X.  http://dx.doi.org/10.1590/0370-44672017710075.

The study aimed to characterize the mineral wools obtained from wastes of the cutting step of marble and granite, in order to evaluate the possibility of their use on an industrial scale. Mixtures of marble and/or granite wastes were prepared in order to reach the chemical composition of rock and glass wools. The batches were melted in an electric arc furnace in laboratory scale at 1450ºC and casted with water, in order to obtain a higher cooling rate. Characterization work was performed in batches that formed vitreous material, and with superior incorporation of the residues: 11.7% and 14.6% of marble waste with glass wool and rock wool, respectively; 78.3% and 91.6% of an association of marble and granite wastes with glass wool and rock wool, respectively. Computational thermodynamics was used in order to obtain the main phases at 800ºC and determine the liquid and solid content at 1400, 1450 and 1500ºC. In addition, the materials obtained were characterized via chemical analysis using X-ray fluorescence, DTA, X-ray diffraction and SEM. The results indicate that the marble and granite waste are composed mainly of CaO (34.7 wt.%) and SiO2 (66.3 wt.%), respectively. An amorphous crystalline structure was obtained in all tests, indicating that this material can be used as an insulation material. The crystallization temperatures were determined around 800ºC.

Palavras-chave : marble; granite; recycling; mineral wool; glass characterization.

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