Nickel recovery from the rinse waters of plating baths

Metal recovery from spent hydrodesulfurization catalysts using a combined acid-leaching and electrolysis process

“…The maximum recoveries of Mo, Ni, and V were obtained from the electrolyte with an initial pH value of 2.0. However, Orhan et al [16] reported that maximum Ni recoveries from plating bath rinsing water were obtained within a pH range of 5.45-5.55. The discrepancy between their work and this study is mainly due to the different systems used (i.e., electrode, electrolyte, and operation mode, etc.).…”

“…Among these techniques, electrolysis is attractive for its versatility, energy efficiency, simple equipment, easy operation, and low operating cost [17,18]. Electrolysis processes have been utilized in heavy metal recovery from municipal incinerator fly ash [19], spent Ni-Cd batteries [15], printed circuit boards [20], and waste waters [16,21]. However, little information is available about recovering metals from spent HDS catalyst acid-leachate.…”

“…After acid-leaching, metals can be separated or recovered from the acid-leachate by separation processes such as solvent extraction, chemical precipitation, ion-exchange, and electrolysis [1,16]. Among these techniques, electrolysis is attractive for its versatility, energy efficiency, simple equipment, easy operation, and low operating cost [17,18].…”

Combined electrochemical and biological treatment of industrial wastewater using porous electrodes

“…A similar observation was also reported by several researchers who worked in treating dilute metallic wastewater. 8,17,18 In the electrodeposition of metal ions using insoluble anodes, the bulk pH usually decreases owing to the electrolysis of water releasing H + into the solution. 19 Under neutral and acidic conditions the electrolysis of water at the anode can be described as 20…”

Recycling of nickel–metal hydride batteries. II: Electrochemical deposition of cobalt and nickel

“…This crystallographic orientation is similar to that observed from pure state nickel crystallites. 29 Moreover the sharp reflections throughout the spectrum indicated the presence of large-size crystallites. Single peaks were observed for nickel and cobalt due to their indistinguishable X-ray scattering powers.…”