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To address the problem of excessive accumulation of iron acid in bio-heap leaching of high-sulfur and low-copper ore, the regulation and mechanism of leaching of high sulfur and low copper ores by limestone were studied by bio-column leaching method and MLA detection and analysis method. The results show that the pH and Eh of the leaching solution can be significantly regulated by adding limestone with mass fraction of 2% and particle size of -10 mm+5 mm to 1.4 t ore. After 7 months of biological column leaching, the copper leaching rate can reach 71.25%, which is 52.83% higher than that of the control group without adding limestone. The distribution size of pyrite in the leaching slag of limestone addition group increases, and no xanax passivation layer is found, and the dissociation degree of fine copper minerals is positively correlated with the leaching rate. The addition of limestone can effectively enhance the copper leaching efficiency in high-sulfur and low-copper ore and reduce the burden of acid-iron wastewater treatment, which is of great significance for the sustainable development of sulfide ore mining operations.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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