School of Chemical Engineering and Environment, Beijing Institute of Technology, Beijing 100081, PR China.
Bioresour Technol. 2012 Feb;106:147-53. doi: 10.1016/j.biortech.2011.12.013. Epub 2011 Dec 13.
In this work, bioleaching was used to extract valuable Zn and Mn from spent Zn-Mn batteries. The results showed that 96% of Zn extraction was achieved within 24h regardless of energy source types and bioleaching bacteria species. However, initial pH had a remarkable influence on Zn release, extraction dose sharply decreased from 2200 to 500mg/l when the initial pH value increased from 1.5 to 3.0 or higher. In contrast to Zn, all the tested factors evidently affected Mn extraction; the maximum released dose of 3020mg/l was obtained under the optimum conditions. The acidic dissolution by biogenic H(2)SO(4) by the non-contact mechanism was responsible for Zn extraction, while Mn extraction was owed to both contact/biological and non-contact mechanisms. The combined action of acidic dissolution of soluble Mn(2+) by biogenic H(2)SO(4) and reductive dissolution of insoluble Mn(4+) by Fe(2+) resulted in 60% of Mn extraction, while contact of microbial cells with the spent battery material and incubation for more than 7days was required to achieve the maximum extraction of Mn.
在这项工作中，采用生物浸出法从废锌锰电池中提取有价值的锌和锰。结果表明，无论能源类型和生物浸出细菌种类如何，在 24 小时内锌的提取率达到 96%。然而，初始 pH 值对锌的释放有显著影响，当初始 pH 值从 1.5 增加到 3.0 或更高时，浸出剂量从 2200 毫克/升急剧下降到 500 毫克/升。与锌不同，所有测试的因素都明显影响了锰的提取；在最佳条件下，最大释放剂量达到 3020 毫克/升。非接触机制下生物生成的 H2SO4 的酸性溶解负责锌的提取，而锰的提取则归因于接触/生物和非接触机制。生物生成的 H2SO4 溶解可溶性 Mn2+的酸性溶解和 Fe2+还原溶解不溶性 Mn4+的联合作用导致 60%的锰被提取，而微生物细胞与废电池材料接触并培养超过 7 天是实现锰最大提取的必要条件。
