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Selective dissolution of copper from copper-chromium spent catalyst by baking–leaching process
P.K.Parhi,T.R. Sethy,P.C. Rout,K. Sarangi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
The selective leaching of copper from the spent Cu-Cr catalyst was carried out with H2SO4. The effect ofdifferent parameters such as acid concentration, pulp density, temperature and particle size on leachingwas investigated. The maximum extraction of copper and chromium was 67.25 and 2.3%, respectively atparticle size 45–53 mm, pulp density 2.5%, temperature 90 8C, time 180 min. Therefore, baking followedby leaching approach was adopted for dissolution of spent copper-chromium catalyst using H2SO4 toenhance the metal leaching efficiency. At the optimum baking–leaching condition i.e. baking time 2 h,baking temperature 300 8C, baking acid concentration 0.5 M, leaching temperature 35 8C, time 60 min,[H2SO4] 4%, P.D. 2.5%, the extraction of copper and chromium was 99.9% and 1.2%, respectively, ensuringthe selective dissolution of copper. The XRD and Fe-SEM-Edax characterization analysis of typicalsamples (original, baked mass and typical residue) were compared and reported. The XRD and Fe-SEMEdaxanalysis of the baked mass indicated the complete sulfation of copper and chromium by H2SO4yielding CuSO4 (H2O) and (Cr)2(SO4)3, respectively in solid phase. The absence of XRD peakscorresponding to CuSO4 H2O in the final typical leach residue (obtained at optimum baking–leachingcondition) confirmed the complete dissolution of copper from Cu-Cr catalyst.