Back to Search
Start Over
Bioleaching of chalcopyrite by Acidianus manzaensis under different constant pH
- Source :
- Minerals Engineering. 98:80-89
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- The bioleaching of pure chalcopyrite by thermophilic Archaea strain Acidianus manzaensis YN-25 under different constant pH was first comparatively investigated. Then the relevant sulfur speciation was analyzed by synchrotron radiation based X-ray diffraction (SR-XRD) and S K-edge X-ray absorption near edge structure (XANES) spectroscopy. The acidity of the leaching solution was monitored at 3-h intervals to make it steady at pH 1.25, 1.50, 1.75, 2.00, 2.25 and 2.50, respectively. Leaching results showed that the copper ion extraction increased during chemical leaching but decreased during bioleaching when pH value decreased from 2.50 to 1.25. SR-XRD analysis showed that, during bioleaching, new elemental sulfur (S 0 ) phase was detected at all tested pH cases; new jarosite phase was detected at cases of pH 1.50 to 2.50; and jarosite gradually became a major phase when pH value increased. XANES analysis further showed that covellite was detected during bioleaching at cases of pH 1.25 to 2.00 at higher redox potential (ORP) value, while chalcocite and bornite were detected at cases of pH 2.25 and 2.50 at lower ORP value. These results suggested that the formation of S 0 was mainly accounting for hindering the dissolution of chalcopyrite while the formation of bornite could accelerate the dissolution of chalcopyrite by A. manzaensis .
- Subjects :
- Chalcocite
Chalcopyrite
Chemistry
Mechanical Engineering
Metallurgy
02 engineering and technology
General Chemistry
010501 environmental sciences
Covellite
engineering.material
Geotechnical Engineering and Engineering Geology
01 natural sciences
020501 mining & metallurgy
0205 materials engineering
Control and Systems Engineering
visual_art
Bioleaching
Jarosite
visual_art.visual_art_medium
engineering
Bornite
Leaching (metallurgy)
Dissolution
0105 earth and related environmental sciences
Nuclear chemistry
Subjects
Details
- ISSN :
- 08926875
- Volume :
- 98
- Database :
- OpenAIRE
- Journal :
- Minerals Engineering
- Accession number :
- edsair.doi...........144e831fb6600770293ef83ea0175ac3