4.7 Article

A classical modelling of abandoned mine tailings' bioleaching by an autochthonous microbial culture

期刊

JOURNAL OF ENVIRONMENTAL MANAGEMENT
卷 323, 期 -, 页码 -

出版社

ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jenvman.2022.116251

关键词

Modelling; Rate kinetics; Iron-oxidizing microorganisms; Bioleaching; Mine tailings

资金

  1. European Union (FEDER) [SBPLY/19/180501/000254]
  2. Castilla-La Mancha regional government
  3. Ministry of Science, Innovation and Universities [PID2019-107282RB-I00, EQC2018-004240-P]
  4. University of Castilla-La Mancha [2019-PREDUCLM-11569]

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This study aimed to investigate the bioleaching of abandoned mine tailings using autochthonous mesophilic microbial culture at different pulp densities, with a focus on the ferrous-iron oxidation process and the kinetic parameters. The experimental results were analyzed using a mathematical model, and significant values such as the maximum ferrous-iron oxidation rate and biomass yield were determined. The bioleaching experiment showed promising metal recovery rates, especially at 1% w/v pulp density.
The aim of this study was to study and model the bioleaching of abandoned mine tailings at different pulp densities 1-20% w/v by using an autochthonous mesophilic microbial culture. Because of the importance of the ferrous-iron oxidation as sub-process on the bioleaching of sulphide mineral ores, the ferrous-iron oxidation process by the autochthonous microbial culture was studied at different ferrous-iron concentrations. A mathematical model fitted to the experimental results and the main kinetic and stoichiometric parameters were determined, being the most relevant the maximum ferrous-iron oxidation rate 5.1 (mmol Fe2+/mmol C.h) and the biomass yield, 0.01 mmol C/mmol Fe2+, values very similar to that of mixed cultured dominated by Leptospirillum strains. This autochthonous culture was used in the bioleaching experiment carried out at different pulp densities, obtaining a maximum metal recovery in the tests carried out at 1% w/v, recovering a 90% of Cd, 60% of Zn, 30% of Cu, 25% Fe and 6% of Pb. Finally, the different leaching mechanisms were modelled by using the pyrite as ore model obtaining a bioleaching rate of 0.316 mmol Fe2+/(L.h) for the direct mechanisms and a bioleaching rate for the indirect and cooperative leaching mechanisms of 0.055 Fe2+/(L.h).

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