This paper describes the separation and recovery of metal values such as nickel, cobalt and rare earths from spent nickel-metal hydride (Ni-MH) secondary batteries. The containing metals (Ni, Co, rare earths, Mn, Zn, Fe) in the batteries were efficiently leached by sulfuric acid solutions. By adjusting a pH of this leach liquor at around 8, rare earths were recovered as a white precipitate. Solvent extraction and supported liquid membranes using PC-88A in kerosene were applied for separation and recovery of Ni and Co from the filtrate. We propose a composite process using the both techniques for the separation and recovery of metal values from spent Ni-MH secondary batteries.
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