Add time:08/14/2019         Source:sciencedirect.com

:The electrolytic manganese residues (EMRs) contain variable amounts of trace metals and valuable elements, which can negatively impact the environment. This research focused on recovering valuable elements (SO42−, NH3N, Mn, Mg, and Fe) from EMRs by bioleaching. Bacteria (Y1) were isolated from EMRs and then acclimated for bioleaching processes. The bacteria can grow with waste molasses as the only carbon/nutrient source. After bioleaching for 8 days, 78–88%, 85–98%, 75–85%, 88–95%, and 95–99% of SO42−, Mn, Mg, Fe, and NH3N were leached out from EMRs with a solid-to-liquid ratio of 1:2.5 kg of EMR powder L−1 of leaching liquid. Then, the elements of NH3N, Mn, Mg, and Fe were separately precipitated as (NH4)2Mn(SO4)2 6H2O, (NH4)2Mg(SO4)2 6H2O and (NH4) Fe(SO4) 26H2O by adjusting the pH of the bioleachate (i.e., the filtrate of the leachate solution) to 8.5–9.0. The process could be cost-effective due to the use of waste molasses (a low-cost product from sugar processes) as carbon sources and may have a great potential for industrial applications.

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