This work studies the optimum reductive leaching process for manganese and zinc recovery from spent alkaline battery paste. The effects of reducing agents, acid concentration, pulp density, reaction temperature, and l...This work studies the optimum reductive leaching process for manganese and zinc recovery from spent alkaline battery paste. The effects of reducing agents, acid concentration, pulp density, reaction temperature, and leaching time on the dissolution of manganese and zinc were investigated in detail. Manganese dissolution by reductive acidic media is an intermediate-controlled process with an activation energy of 12.28 kJ'mo1-1. After being leached, manganese and zinc were selectively precipitated with sodium hydroxide. The zinc was entirely con- verted into zincate (Zn(OH)42-) ions and thus did not co-precipitate with manganese hydroxide during this treatment (2.0 M NaOH, 90 min, 200 r/rain, pH 〉 13). After the manganese was removed from the solution, the Zn(OH)4^2- was precipitated as zinc sulfate in the presence of sulfuric acid. The results indicated that this process could be effective in recovering manganese and zinc from alkaline batteries.展开更多
废锌锰电池极性材料在一定条件下可以较好地溶解于硝酸中,其液固质量比及H2O2加入量对溶解过程有较大的影响。采用正交实验的方法得出硝酸溶解废旧锌锰电池极性材料的适宜条件为:硝酸浓度6 mol/L、液固质量比13.6、H2O2质量分数2.5%、...废锌锰电池极性材料在一定条件下可以较好地溶解于硝酸中,其液固质量比及H2O2加入量对溶解过程有较大的影响。采用正交实验的方法得出硝酸溶解废旧锌锰电池极性材料的适宜条件为:硝酸浓度6 mol/L、液固质量比13.6、H2O2质量分数2.5%、反应温度60℃、反应时间25 m in。展开更多
基金Scientific and Technological Research Council of Turkey for financial support
文摘This work studies the optimum reductive leaching process for manganese and zinc recovery from spent alkaline battery paste. The effects of reducing agents, acid concentration, pulp density, reaction temperature, and leaching time on the dissolution of manganese and zinc were investigated in detail. Manganese dissolution by reductive acidic media is an intermediate-controlled process with an activation energy of 12.28 kJ'mo1-1. After being leached, manganese and zinc were selectively precipitated with sodium hydroxide. The zinc was entirely con- verted into zincate (Zn(OH)42-) ions and thus did not co-precipitate with manganese hydroxide during this treatment (2.0 M NaOH, 90 min, 200 r/rain, pH 〉 13). After the manganese was removed from the solution, the Zn(OH)4^2- was precipitated as zinc sulfate in the presence of sulfuric acid. The results indicated that this process could be effective in recovering manganese and zinc from alkaline batteries.