Oliveira, Víctor de Andrade AlvarengaRodrigues, Michael Leonardo MarquesLeão, Versiane Albis2021-12-212021-12-212021OLIVEIRA, V. de. A. A.; RODRIGUES, M. L. M.; LEÃO, V. A. Reduction roasting and bioleaching of a limonite ore. Hydrometallurgy, v. 200, artigo 105554, mar. 2021. Disponível em: <https://www.sciencedirect.com/science/article/abs/pii/S0304386X21000037>. Acesso em: 12 set. 2021.0304-386Xhttp://www.repositorio.ufop.br/jspui/handle/123456789/14275Two of the main challenges presented by the implementation of nickel laterites atmospheric acid leaching are: (i) high acid consumption and (ii) high final iron concentrations in the PLS. In the current work, a novel process was devised by applying pyrometallurgical and bio-hydrometallurgical operations. The experimental set-up comprised the reduction of a nickel limonitic ore with hydrogen gas in a rotary kiln, at 900 ◦C, until all the goethite was converted to metallic iron. Subsequently, the reduced sample was bioleached by mesophilic microorganisms grown on Fe2+ (Acidithiobacillus ferrooxidans) at 5% solids, 32 ◦C, and pH < 3. The results showed that an increase in the Eh values, promoted by the bacteria, resulted in the leaching Fe, Ni and Co, therefore a dissolution of 92% of the nickel and 35% of the cobalt was observed in experiments carried out with 35 Kg H2SO4/(ton of the reduced ore). The iron concentration in the liquor generated under these experimental conditions was below 5 mg/L owing to the fact that Fe3+ precipitated as jarosite. The experimental conditions applied also resulted in low acid consumption and the final total iron concentration was also reduced in the leach liquor (< 200 mg/L), which were considerably lower than the values reported for the HPAL process.en-USrestritoLimonite oreReduction by hydrogenNickel bioleachingAcid consumptionArtigo publicado em periodicohttps://www.sciencedirect.com/science/article/abs/pii/S0304386X21000037https://doi.org/10.1016/j.hydromet.2021.105554