Influence of Chelators on Iron Solubilization from Quartz and Feldspars by Bioleaching
Ultra-fine iron particles are difficult to treat by conventional mineral processing methods. Thus bioleaching is an attractive alternative for effective removal of iron minerals. The removal of oxidic Fe-phases from industrial silicates via bioleaching needs to be optimized with regard to the rate of iron reduction and dissolution. A new role for chelators as the low addition of AQDS or NTA during bacterial quality improvement of non-metallics, resulted in stimulating of Fe dissolution under non-controlled anaerobic conditions. AQDS stimulated bacterial iron reduction and Fe2+ concentration in solution was higher than Fe3+. However, NTA non-stimulated iron reduction, but increased bacterial iron dissolution in form of Fe3+. Changes in iron removal from samples were used to assess the chelator effectiveness of the heterotrophic bioleaching process. Chelators might be added to iron-contaminated non-metallics during bioleaching processes for stimulation of rate of iron removal.
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
I. Štyriaková "Influence of Chelators on Iron Solubilization from Quartz and Feldspars by Bioleaching", Advanced Materials Research, Vols. 20-21, pp. 87-90, 2007