Abstract
Problem statement: In this study Linear Genetic Programming (LGP) and statistical regression are used in predicting Current Efficiency (CE) of Electro deposition cell used for recovery of nickel from spent nickel catalyst. Approach: The Nickel electro deposition from spent catalyst leachate solutions was studied to determine the effect of the operative conditions such as nickel concentration, temperature, current density and time on the CE of the unit cell. Results: For this purpose, LGP and regression models were calibrated with training sets and validated by testing sets. Additionally, the robustness of the proposed LGP and regression models were evaluated by experimental data, which are used neither in training nor at testing stage. The results showed that both techniques predicted the CE data in quite good agreement with the observed ones and the predictions of LGP are challenging. Conclusion/Recommendations: The performance of LGP, which was moderately better than statistical regression, is very promising and hence supports the use of LGP in simulating the electro deposition of Nickel from spent Nickel catalyst.
Highlights
The demand for nickel has recently risen for its promising use in rechargeable batteries
The amount deposited ranged from 1.03-1.07 g in 1 h. high Current Efficiency (CE) efficiency obtained at lower current density
It was found that the concentration of nickel and the Current Density (CD) have the most significant effect on the CE while time has almost no significant effect on the CE These conclusions are in good agreement with the experimental results
Summary
The demand for nickel has recently risen for its promising use in rechargeable batteries. In Egypt, large amount of Nickel catalysts are used by different industries resulting in the production of large amount of solid waste containing nickel which is the spent or deactivated catalysts. These catalysts contain from 14-24% nickel based on the production company and the process (Ghanem et al, 2008). Some other researchers studied the nickel electro-winning (Khanna et al, 2000) based on sulphate and/or chloride electrolyte. Lupi and Pasquali (2003) and Zhou et al (1997) Studied the electrolytic nickel recovery from lithium ion batteries. Nickel electro winning is performed from electrolytes containing NiCl2 and/or NiSO4 in the presence of high concentrations of H3BO3
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