Resumo

ZAPATA AGUIRRE, DIONI MABEL; OSSA HENAO, DIANA MARCELA  e  MARQUEZ GODOY, MARCO ANTONIO. MINERALOGICAL CHARACTERIZATION OF OXIDATION PRODUCTOS IN A PYRITE-SPHALERITE SYSTEM USING INDIGENOUS Fe OXIDIZING BACTERIA. Dyna rev.fac.nac.minas [online]. 2008, vol.75, n.154, pp.59-64. ISSN 0012-7353.

A biooxidation study of sphalerite and pyrite concentrates was evaluated in a shaker experiments using an acidofile native strain, compatible with Acidithiobacillus ferrooxidans. The experiments were done to 35°C, using different proportions of pulp. Scanning electron microscopy (SEM) analysis showing grain morphologies that make evident different mechanisms of oxidation for both sulfides. After oxidation, the sphalerite looks an elemental sulphur layer, with core residues displaying embayment corrosion, indicating an active oxidizer environment. The sulphur layers showing concentrically banding, indicating several pulses of deposition. On the other hand, pyrite crystals displayed embayments and pits of corrosion, without sulphur layers. The principal products of the oxidations of both sulfides were, besides elemental sulphur, jarosite and another iron sulphate. The sequential formation of this mineral phases and the preferential oxidation of sphalerite more than pyrite was made evident.

Palavras-chave : Zn biolixiviation; sphalerite biooxidation; process mineralogy; Acidithiobacillus ferrooxidans.

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