Biooxidation of mining tailings from Zloty Stok
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Wrocław Uniwersity of Technology
University of Opole
Publication date: 2000-01-01
Physicochem. Probl. Miner. Process. 2000;34(1):47-56
The biooxidation of gold-bearing arsenic concentrate from mining tailing was investigated. The strain of Theobacillus ferrooxidaris isolated from the Zloty Stok tailing heaps was used, The chemical and biooxidation processes were monitored by checking the ferrous, ferric and arsenic concentration in the leaching solution. Leaching experiments were conducted using both coarse (-0.5 *0.125 mm) and fine (-0,045 mm) fractions. The samples were examined by means of the specific surface area measurements and the X-ray diffraction analysis. The small differences were observed during the oxidation of coarse and fine fractions. The slow chemical dissolution of loellingite (AsFe2) a main arsenic-bearing mineral, was supported by X-ray diffragrams. In the case of a fine fraction oxidation, the precipitation of ferric arsenate was responsible for the lower Fe and As readings. The production of new phase was also supported by the FTIR spectra. Obtained results suggest that the direct biooxidation mechanism was responsible for the arsenic-bearing concentrate biooxidation.
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