Resumo

DIAZ, Manuel; AMAYA, Iván  e  CORREA, Rodrigo. Microwave Enhanced Roasting for Pyrite Ore Samples with Dielectric Properties Strongly Dependent on Temperature. Ing. Univ. [online]. 2016, vol.20, n.1, pp.63-84. ISSN 0123-2126.  https://doi.org/10.11144/Javeriana.iyu20-1.merp.

This article shows the main experimental results related to measuring dielectric properties of Pyrite ore mineral samples as a function of temperature, and their effect on the heating behavior of the samples. It was found that the real, c'(T), and imaginary, c''(T), components of permittivity are strongly dependent on temperature. The model that best fitted experimental data for c'(T) and c'(T), was a Gaussian correlation, reaching R² values over 0.995. Besides, and under certain conditions, it was possible to roast the mineral even better than with an electric furnace, while requiring less processing time (about 77.5% less) and with lower electrical energy consumption (about 80.8% less). Additional exploratory tests revealed that microwaves can be used to smelt a roasted mineral ore with time reductions of about 90%, while keeping recovery margins above 95%. Next stages of research should be directed to using a single mode applicator for processing higher volumes of mineral at pilot plant scale.

Palavras-chave : roasting; gold; mineral ore; microwave heating; smelting.

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