Leaching of pyrolusite using molasses alcohol wastewater as a reductant |
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| Authors: | Haifeng Su Yanxuan Wen Fan Wang Xuanhai Li Zhangfa Tong |
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| Affiliation: | 1. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004, China;;2. Educational Administration Department, Guangxi University, Nanning 530004, China;1. Department of Mining Engineering, Federal University of Ouro Preto, Campus Morro do Cruzeiro, CEP.: 35.400-000, Ouro Preto, Minas Gerais, Brazil;2. Department of Control and Automation Engineering and Fundamental Techniques, Federal University of Ouro Preto, Campus Morro do Cruzeiro, CEP.: 35.400-000, Ouro Preto, Minas Gerais, Brazil |
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| Abstract: | Extraction of manganese from a pyrolusite ore was investigated using molasses alcohol wastewater as a reducing agent in dilute sulfuric acid medium. The effects of molasses alcohol wastewater dosage, concentration of sulfuric acid, leaching temperature and reaction time were studied. High manganese recovery, coupled with relatively low Fe and Al extraction yields, was obtained with this leaching process. The optimal leaching conditions were obtained using 1.9 mol/L H2SO4 and 2.0 mL/g ratio of molasses alcohol wastewater to pyrolusite for 120 min at 90 °C. These conditions resulted in leaching yields of 93% for Mn, with relatively low recoveries of 37% for Fe and 25% for Al.These results demonstrate that molasses alcohol wastewater is a low cost resource, containing renewable and non-hazardous reducing agents (when compared to other available reagents) that can be used for manganese leaching under mild acidic conditions. In short, the method provides a good extraction yield while making an economically productive use of molasses alcohol wastewater. |
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