An Experimental Approach for Studying Chalcopyrite Leaching and Passivation in Column Bioleaching

Tuomas van der Meer; Jussi Liipo; Jaakko Leppinen

doi:10.4028/www.scientific.net/AMR.71-73.381

Paper Titles

Sulfide Mineral Induced Oxidative Stress as a Limiting Factor in Tank Bioleaching Performance
p.365

Impacts of Mineralogy on the Chemistry and Microbiology of Heap Bioleaching
p.369

Changes in an Ore Dump during a 40-Year Period of Commercial-Scale and Spontaneous Natural Bioleaching
p.373

Investigations of Attached and Unattached Cells during Bioleaching of Chalcopyrite with Acidianus Manzaensis at 65°C
p.377

An Experimental Approach for Studying Chalcopyrite Leaching and Passivation in Column Bioleaching
p.381

Oxidation of Chalcopyrite (CuFeS₂) by Acidithiobacillus Ferrooxidans and a Mixed Culture of Acidithiobacillus Ferrooxidans and Acidithiobacillus Thiooxidans Like Bacterium in Shake Flasks
p.385

Rietveld Refinement of X-Ray Diffractograms Evidences Surface Texturization in Chemical and Biological Leaching of Chalcopyrite at 70°C
p.389

Influence of CO₂ and O₂ Feeding Rates on the Continuous Bioleaching of a Chalcopyrite Concentrate Using Sulfolobus Metallicus
p.393

The Effect of Chloride Ions and A. Ferrooxidans on the Oxidative Dissolution of the Chalcopyrite Evaluated by Electrochemical Noise Analysis (ENA)
p.397

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An Experimental Approach for Studying Chalcopyrite Leaching and Passivation in Column Bioleaching

Abstract:

The effect of different microbial consortia on the leaching of chalcopyrite was studied at different temperatures and solution compositions with Boliden’s Aitik ore in column reactors simulating heap bioleaching. The columns were equipped with sampling chambers and chalcopyrite mineral electrodes in order to investigate the passivation of chalcopyrite. The sampling chambers were filled with agglomerated ore and pieces of chalcopyrite-rich ore. In addition to chemical analysis of the leaching solution and solids the progress of leaching of chalcopyrite was studied by continuous potential measurements with chalcopyrite electrodes. The occurrence and composition of potentially passivating layers on the surfaces of the electrodes and the samples taken from sample chambers were examined by optical and scanning electron microscopy.