Optimization of copper extraction for bioleaching of complex Cu-polymetallic concentrate by moderate thermophiles
(1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, China;
2. Department of Clinic Laboratory, Changsha Medical University, Changsha 410219, China;
3. Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China;
4. Key Laboratory of Marine Biogenetic Resources, State Oceanic Administration, Xiamen 361005, China)
2. Department of Clinic Laboratory, Changsha Medical University, Changsha 410219, China;
3. Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha 410083, China;
4. Key Laboratory of Marine Biogenetic Resources, State Oceanic Administration, Xiamen 361005, China)
Abstract: Effects of initial pH, temperature, liquid volume, rotation speed, galvanic interaction (pyrite ratio) and pulp density on bioleaching of complex Cu-polymetallic concentrate were investigated. The results indicated that the copper extraction at pH 1.5 was 1.5 and 1.4 times that at pH 1.0 and pH 2.0 respectively. The copper extraction obtained at 45 °C was 1236.8% higher than that at 50 °C. With the increase of rotation speed or the decrease of liquid volume, copper extraction was improved obviously. Copper extraction was improved gradually with the increase of pyrite ratio. However, when the ratio was higher than 20.0%, no further increase in copper extraction was observed. And the statistically significant interactive effects on copper extraction were found between temperature and pH, and temperature and pyrite ratio.
Key words: moderate thermophiles; bioleaching; complex Cu-polymetallic concentrate; copper extraction; optimization