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Dissolution kinetics of iron oxides in clay in oxalic acid solutions

International Journal of Minerals,Metallurgy and Materials 2012年第12期19卷 1083-1087页

作者： U.K. sultana a.s.w. kurny Department of Materials and Metallurgical Engineering Bangladesh University of Engineering and Technology

Clay samples containing 8.15% iron oxides and 27.49% alumina were leached in oxalic acid. Leaching experiments were per-formed in aqueous solutions of oxalic acid of 0.2-2 mol/L at 40-80 C for up to 90 min. The mixed kinetic mechanism, i.e., t/τ=[（1 2X/3）（1 X）2/3 ]＋b[ 1 （1 X）1/3], seemed to be the most appropriate one to fit the kinetic data of leaching iron oxides contained in clay in the aqueous oxalic acid solutions. The Arrhenius activation energy for leaching in the 1.8 mol/L oxalic acid was found to be 41.035 kJ/mol.

关键词： clay iron oxides leaching oxalic acid kinetics activation energy

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Characterization of spent Household Zinc-Carbon Dry Cell Batteries in the Process of Recovery of Value Metals

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Journal of Minerals and Materials Characterization and Engineering 2012年第6期11卷 641-651页

作者： Majharul Haque Khan a.s.w.kurny Materials and Metallurgical Engineering Department Bangladesh University of Engineering and Technology Dhaka Bangladesh

spent zinc-carbon dry cell batteries were characterized to assess the environmental impacts and also, to identify the potentials of recovering the metal values from these batteries. Different component parts of both new and spent batteries of all the five types (AAA, AA, C, D and 9V) were examined. The outer steel casings were found to be tin plated. steel, zinc and manganese constituted 63 percent of the total weight of the battery. Average zinc and manganese contents were about 22 and 24 percent of the total weight of spent batteries. The electrolyte paste of the spent batteries contained 22 wt. percent zinc and 60 wt. percent manganese. The rest was chlorine, carbon and small amounts of iron and other impurity elements. The major phases in the fresh batteries were carbon, MnO2 and NH4Cl, while Zn(NH3)2Cl2, ***2O3, Mn3O2 and Mn2O4 were the prominent phases in the spent batteries. Presence of mercury and cadmium were not detected and a small percentage of lead was found in both the zinc anode and in the electrolyte paste.

关键词： Zinc-carbon battery Characterization spent batteries waste management

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