Bioleaching and chemical leaching as an integrated process in the zinc industry
Bioleaching and chemical leaching as an integrated process in the zinc industry
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DOI：
10.1016/j.mineng.2006.12.014
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发表时间：
2007-05-01
影响因子：
4.8
通讯作者：
Leao, Versiane Albis
中科院分区：
文献类型：
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作者：
de Souza, Adelson D.;Pina, Pablo S.;Leao, Versiane Albis
这项工作试图将生物浸出和化学浸出结合起来，作为处理硫化锌的一种经济有效的工艺。对闪锌矿精矿的连续生物浸出进行了评估，用中温铁和硫氧化细菌测定了 51.4% Zn、1.9% Ph、31.8% S 和 9.0% Fe，然后对生物浸出残渣进行化学浸出。在生物浸出步骤中，第一个反应器用于生产浓度高达 20 g/L 的 Fe(III)。将该溶液送入后续的生物浸出反应器以氧化闪锌矿。 70 小时的停留时间可以实现 30% 的锌提取。在化学浸出实验中，用生物浸出步骤的残留物进行，研究了总铁和酸度对锌提取的影响。人们注意到，Fe(III) 浓度超过 12 g/L 不会影响锌的回收率。此外，对于硫酸浓度高达 181 g/L 的实验，酸度越高，锌回收率越大。结果表明，与传统的焙烧-浸出-电解工艺类似，设计出一种能够实现 96% 锌提取率的新工艺是可能的。 (C) 2007 Elsevier Ltd. 保留所有权利。
This work sought to integrate bioleaching and chemical leaching as a cost-effective process to treat zinc sulphides. The continuous bioleaching of a sphalerite concentrate, assaying 51.4% Zn, 1.9% Ph, 31.8% S and 9.0% Fe with mesophile iron and sulphur-oxidizing bacteria followed by chemical leaching of the bioleaching residue were assessed. In the bioleaching step, the first reactor was used to produce Fe(III) concentrations as high as 20 g/L. This solution was fed to the subsequent bioleaching reactors to oxidize sphalerite. It was possible to achieve 30% zinc extraction for 70 h residence time. In chemical leaching experiments, carried out with the residue of the bioleaching step, the effects Fe-total and acidity on zinc extraction were studied. It was noticed that Fe(III) concentrations over 12 g/L did not affect zinc recoveries. Furthermore, the higher the acidity, the larger the zinc recovery, for experiments carried out up to 181 g/L sulphuric acid. The results have demonstrated that it is possible to devise a new process capable of achieving 96% zinc extraction, similarly to the conventional roasting-leaching-electrolysis process. (C) 2007 Elsevier Ltd. All rights reserved.