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首页> 外文会议>International Biohydrometallurgy Symposium >Leaching of Ni and Cu from mine wastes (tailings and slags) using acid solutions and A. ferrooxidans
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Leaching of Ni and Cu from mine wastes (tailings and slags) using acid solutions and A. ferrooxidans

机译：使用酸溶液和柠檬酸盐的矿废物（尾矿和渣）浸出Ni和Cu的浸出

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The objective of this work is to evaluate the acidic and biological leaching of tailings containing Ni/Cu from a flotation and smelting plant. Acidithiobacillus ferrooxidans, strain LR, was used for bioleaching at pH 1.8 and chemical controls were run parallel to that. The acidic leaching was done within 48 hours at pH 0.5 and 1.0. In the slag inoculated flasks the redox potential was high (600 mV), thus indicating oxidative bacterial activity, however, the obtained results after 15 days showed only around 13% Ni and 8% Cu extractions, which were not different to those of the controls. For the flotation tailings bioleaching extractions were approximately 45% for Ni and 16% for Cu while differing figures were obtained for the chemical controls. These were 30% and 12% respectively. Here we could observe that the presence of bacterial activity led to a higher solubility of Ni. Acid leaching of slag showed higher nickel and copper extractions: 56% and 24% respectively at pH 0.5 and 21% and 11% at pH 1.0. However, the acid consumption was 320 and 150 Kg/ton of slag, respectively, both much higher than in bacterial assays. These results indicated that Ni and Cu solubilization from the slag is acid dependent no matter the redox potential or ferric iron concentration of the leaching solution. For flotation tailings, acid treatment showed extractions of 23% for Ni and 16% for copper at pH 0.5 and 22% and 28%, respectively at pH 1.0. The acid consumption was also higher: 220 and 120 Kg/ton, at pH 0.5 and 1.0, respectively. Based on own findings we could observe that acid leaching is found to be more effective for slag, though the acid consumption is much higher, while for the flotation tailings, bacterial leaching seems to be the best alternative.
机译：这项工作的目的是评估含有Ni / Cu的尾矿的酸性和生物浸出，来自浮选和冶炼厂。酸酐铁氧播载体，菌株LR，用于在pH 1.8处用于生物浸出，并与该化学对照进行平行。酸性浸出在pH 0.5和1.0时在48小时内完成。在炉渣接种烧瓶中，氧化还原电位高（600mV），因此表示氧化细菌活性，然而，15天后的得到的结果仅显示约为13％的Ni和8％Cu萃取，这与对照的不不同。对于浮选尾矿，Biol浸出萃取对于Ni约45％，Cu的16％，而是获得不同数字的化学对照。这些分别为30％和12％。在这里，我们可以观察到细菌活性的存在导致Ni的溶解度较高。酸的酸浸出显示镍和铜提取物更高：pH值为56％和24％，pH 1.0的11％。然而，酸性消耗分别为320和150kg /吨渣，高于细菌测定。这些结果表明，无论浸出溶液的氧化还原电位或铁浓度，Ni和Cu溶解是酸的依赖性。对于浮选尾矿，酸治疗表现出Ni的萃取和pH值为0.5和22％和28％的16％，分别在pH 1.0下进行16％。酸消耗也更高：220和120kg /吨，分别在pH 0.5和1.0处。基于自己的发现，我们可以观察到酸性浸出对于炉渣更有效，尽管酸消耗要高，但对于浮选尾矿，细菌浸出似乎是最佳替代品。

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