Intensified bioleaching of chalcopyrite concentrate using adapted mesophilic culture in continuous stirred tank reactors
- Title
- Intensified bioleaching of chalcopyrite concentrate using adapted mesophilic culture in continuous stirred tank reactors
- Author
- 김현중
- Keywords
- Chalcopyrite; Microbial intensified leaching; Continuous stirred tank reactors; Mesophilic consortia; Bioleaching mechanism; Rate-limiting step
- Issue Date
- 2020-07
- Publisher
- ELSEVIER SCI LTD
- Citation
- BIORESOURCE TECHNOLOGY, v. 307, article no. 123181
- Abstract
- The bioleaching of chalcopyrite concentrate, intensified by the adapted mesophilic culture in the continuous stirred tank reactors (CSTR) was investigated. The cumulative bioleaching efficiency of copper was found to be increased from 34.8% to 49.3% in CSTR-1, 40.3% to 71.2% in CSTR-2, and 44.3% to 73.8% in CSTR-3, while the temperature was elevated from 30 to 37 °C, respectively; whereas, the pulp density (10%, w/v), agitation speed (350 rpm), aeration (400 cc/min), and retention time (7 days across the three reactors) were also optimized to keep constant. Further, the activation energy calculated for copper dissolution under the continuous flow indicated that the surface-diffusion was the overall rate-limiting step for the bioleaching process. Instrumental analysis of solid samples could reveal the degradation pathways of chalcopyrite bioleaching as: CuFeS2 → Cu2S → Cu0.3333Fe0.6667S → H9Fe3O18S8. It follows a complex mechanism that includes the occurrence of polysulfide and cooperative mechanism along with the passivation onto mineral surfaces.
- URI
- https://www.sciencedirect.com/science/article/pii/S0960852420304521?via%3Dihubhttps://repository.hanyang.ac.kr/handle/20.500.11754/169496
- ISSN
- 0960-8524; 1873-2976
- DOI
- 10.1016/j.biortech.2020.123181
- Appears in Collections:
- COLLEGE OF ENGINEERING[S](공과대학) > EARTH RESOURCES AND ENVIRONMENTAL ENGINEERING(자원환경공학과) > Articles
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