Abstract

AMAYA, IVÁN et al. IMPROVED ROASTING OF SOME COLOMBIAN GOLD ORES. Dyna rev.fac.nac.minas [online]. 2013, vol.80, n.178, pp.70-77. ISSN 0012-7353.

This article shows the main results after roasting a gold ore with electromagnetic waves. A mineral sample from southern Bolivar (Colombia) was chosen, due, among other reasons, to the difficulty that miners from that zone tend to have when trying to recover the gold by traditional means. It was found that after applying electromagnetic waves in the microwaves range, roasting time was reduced by 77 to 83%, on average decreasing the consumption of electrical energy by about 88%, while allowing gold recoveries of about 90% (w/w) of that achieved through traditional roasting. This indicates that it is an alternate treatment worth deeper exploration at pilot plant scale.

Keywords : Roasting; microwaves; gold; mineral ore; dielectric heating.

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