Intensified bioleaching of chalcopyrite concentrate using adapted mesophilic culture in continuous stirred tank reactors.
Bioresour Technol
; 307: 123181, 2020 Jul.
Article
en En
| MEDLINE
| ID: mdl-32213446
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 (350â¯rpm), aeration (400â¯cc/min), and retention time (7â¯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 CuFeS2â¯ââ¯Cu2Sâ¯ââ¯Cu0.3333Fe0.6667Sâ¯ââ¯H9Fe3O18S8. It follows a complex mechanism that includes the occurrence of polysulfide and cooperative mechanism along with the passivation onto mineral surfaces.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Cobre
/
Minerales
Idioma:
En
Revista:
Bioresour Technol
Asunto de la revista:
ENGENHARIA BIOMEDICA
Año:
2020
Tipo del documento:
Article