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This paper presents the development of a novel process for the extraction of Ni contained in spent cathodes of NiMH batteries, by using an organic leaching agent, acetic acid (CH 3 COOH), in the presence of hydrogen peroxide (H 2 O 2 ) as a facilitator of cathodic dissolution. The operating parameters studied were temperature, time, and concentration of CH 3 COOH and H 2 O 2 , applying experimental design with subsequent optimisation using the response surface methodology (RSM). The maximum empirical extraction of Ni, of 99.9%, was achieved under the following conditions: temperature, 75°C; CH 3 COOH and H 2 O 2  concentrations, 6% (v/v) and 1.5% (v/v), respectively; reaction time, 30 min; stirring speed, 330 rpm and solid–liquid ratio, 25 g/L. To minimise the values of parameters such as the temperature and concentration of leaching agent and H 2 O 2 , a numerical optimisation was carried out, leading to an optimal extraction value of 95.6%.

Optimisation of nickel extraction from spent cathodes of NiMH batteries by hydrometallurgical process through experimental design