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Direct recovery of cadmium and nickel from Ni-Cd spent batteries by electroassisted leaching and electrodeposition in a single-cell process

Abstract : The investigation was aimed at developing a new electrochemical process for recovery of nickel, cobalt and cadmium mainly present in the form of hydroxides in Ni–Cd batteries, in view to obtain, a solid residue composed of metal nickel and carbon, a pure cadmium-free solution of metal salts and metal cadmium. This process relies upon coupling leaching of the metal hydroxides by electrogenerated protons to electrodeposition in a single divided cell. The feasibility of the technique has been first demonstrated in a lab cell operated in batch mode: cadmium-free solution of nickel and cobalt cations could effectively be produced at the end of the 5-h run, with nearly complete leaching of the hydroxides and a current efficiency of the cathode near 73%: occurrence of side hydrogen evolution at the cathode reduced the efficiency during the last hour of the treatment because of insufficient amounts of Cd2 + cations. In a second test, the waste (called black mass) was added at regular intervals, in view to allowing more regular transfer rates of Cd2 + species to the cathode chamber. The more even profiles of concentrations allowed avoiding depletion of this cation, which resulted in higher current efficiency in cadmium deposition. The efficiency of fed-batch mode is finally discussed in relation to the compromise to be found between purity of the cadmium-free solution and current efficiency of cadmium
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https://hal.univ-lorraine.fr/hal-01924813
Contributor : Francois Lapicque <>
Submitted on : Friday, November 16, 2018 - 12:01:09 PM
Last modification on : Wednesday, September 4, 2019 - 2:06:04 PM

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Claire Hazotte, Nathalie Leclerc, Eric Meux, François Lapicque. Direct recovery of cadmium and nickel from Ni-Cd spent batteries by electroassisted leaching and electrodeposition in a single-cell process. Hydrometallurgy, Elsevier, 2016, 162, pp.94 - 103. ⟨10.1016/j.hydromet.2016.02.019⟩. ⟨hal-01924813⟩

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