Different strategies for recovering metals from CARON process residue

Identificadores
URI: http://hdl.handle.net/10498/16308
DOI: 10.1016/j.jhazmat.2011.03.048
ISSN: 0304-3894
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2011-01-01Department
Ingeniería Química y Tecnología de AlimentosSource
Journal of Hazardous Materials - 2011 - Volume 189, n. 3 pp. 836–842Abstract
The capacity of Acidithiobacillus thiooxidans DMS 11478 to recover the heavy metals contained in
the residue obtained from the CARON process has been evaluated. Different bioreactor configurations
were studied: a two-stage batch system and two semi-continuous systems (stirred-tank reactor
leaching and column leaching). In the two-stage system, 46.8% Co, 36.0% Mg, 26.3% Mn and 22.3% Ni
were solubilised after 6 h of contact between the residue and the bacteria-free bioacid. The results
obtained with the stirred-tank reactor and the column were similar: 50% of the Mg and Co and
40% of the Mn and Ni were solubilised after thirty one days. The operation in the column reactor
allowed the solid–liquid ratio to be increased and the pH to be kept at low values (<1.0). Recirculation
of the leachate in the column had a positive effect on metal removal; at sixty five days
(optimum time) the solubilisation levels were as follows: 86% Co, 83% Mg, 72% Mn and Ni, 62% Fe and
23% Cr. The results corroborate the feasibility of the systems studied for the leaching of metals from
CARON process residue and these methodologies can be considered viable for the recovery of valuable
metals.
Subjects
Acidithiobacillus thiooxidans; Heavy metals; CARON process residue; LeachingCollections
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