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Comparison of chalcopyrite bioleaching after different microbial enrichment in shake flasks |
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| Authors: | Lexian Xia Paulina Uribe Xinxing Liu Chu Yu Liyuan Chai Jianshe Liu Wenqin Qiu Guanzhou Qiu |
| Affiliation: | 1. Key Laboratory of Biohydrometallurgy of Ministry of Education, School of Minerals Processing and Bioengineering, Central South University, Changsha, 410083, People’s Republic of China 3. Instituto de Nutrición y Tecnología de los Alimentos (INTA), Universidad de Chile, Santiago, Chile 2. School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, People’s Republic of China |
| Abstract: | The bioleachings of chalcopyrite ore were compared after inoculating different cultures enriched from the original acid mine drainage sample. The results showed that the higher bioleaching performance was achieved for inoculation with the enrichment D (0.5 % S, 2 % iron and 1 % chalcopyrite) compared to other enrichment systems. The generated ferric precipitation during bioleaching had a key influence on the final copper extraction. After enrichment, higher ratio of iron-oxidizer and higher ratio of sulfur-oxidizer existed in enrichment B and C, respectively. These caused the different bioleaching behaviours from other systems. Maintaining a suitable equilibrium between iron- and sulfur-oxidizers is significant to decrease ferric precipitation or postpone its formation, finally prolong efficient bioleaching period and improve copper extraction. |
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