کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
681675 | 1460037 | 2012 | 7 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Bioleaching of zinc and manganese from spent Zn–Mn batteries and mechanism exploration Bioleaching of zinc and manganese from spent Zn–Mn batteries and mechanism exploration](/preview/png/681675.png)
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 24 h 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 500 mg/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 3020 mg/l was obtained under the optimum conditions. The acidic dissolution by biogenic H2SO4 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 Mn2+ by biogenic H2SO4 and reductive dissolution of insoluble Mn4+ by Fe2+ resulted in 60% of Mn extraction, while contact of microbial cells with the spent battery material and incubation for more than 7 days was required to achieve the maximum extraction of Mn.
► Bioleaching was used to extract Zn and Mn from spent Zn–Mn batteries for the first time.
► The almost complete release of both Zn and Mn showed great potential of bioleaching in the recovery of the spent batteries.
► The acidic dissolution by biogenic H2SO4 as non-contact mechanism was responsible for Zn extraction.
► Mn extraction was due to both contact and non-contact mechanism.
► Acidic dissolution by H2SO4 and reduction dissolution by Fe2+ as non-contact mechanism contributed 60% of Mn extraction.
Journal: Bioresource Technology - Volume 106, February 2012, Pages 147–153