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| Study on Influence of Microcracks on Bioleaching of Copper Sulfide |
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Received:October 12, 2020
Revised:October 15, 2020
Accepted:October 19, 2020
Published Online:January 21, 2021
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| DOI：doi：10.3969/j.issn.1007-7545.2021.02.001 |
| KeyWord:high-pressure grinding roller (HPGR); bioleaching; microcracks; porosity; copper sulfide ore |
| Author | Institution |
| Zhong Wen |
福州大学紫金矿业学院 福建 福州 |
| Zhong Shui-ping |
福州大学紫金矿业学院 福建 福州 |
| Tang Ding |
紫金矿业集团股份有限公司 福建 上杭 |
| Chi Xiao-peng |
福州大学紫金矿业学院 福建 福州 |
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| Abstract: |
| Effect of microcracks on copper bioleaching was studied with Zijinshan low-grade copper sulfide ore. Zijinshan low-grade copper sulfide ore was crushed by jaw crusher, roller crusher and high-pressure grinding roller (HPGR), respectively. Microcracks and porosity of ore were observed and tested by stereomicroscope, scanning electron microscope, nuclear magnetic resonance core imaging system and specific surface area analyzer, respectively. The results show that HPGR can produce more microcracks compared with jaw crusher and roller crusher, and porosity of copper ore samples crushed by HPGR is higher than that of other crushers. The results of shake flask bioleaching experiment of -1.7 mm copper ore sample show that copper leaching rate of samples crushed by HPGR is higher than that of other crushers due to larger specific surface area and porosity of samples crushed by HPGR, and contact between copper mineral and leaching solution is more sufficient. In addition, the results of column bioleaching experiment of -6.7+3.35 mm copper ore samples show that copper leaching rate of ores prepared by HPGR is 9.10-15.43 point percent higher than that of jaw crusher and 3.12~9.45 point percent higher than that of roller crusher. |
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