Study On Recovery Of Copper And Nickel By Direct Electrolysis Step - By - Step Electrofusion Of Nickel - Copper - Copper Waste

Copper and nickel alloy is widely used in industrial production for its’good physical and chemical properties. Performances of copper nickel alloy become weak gradually with the growth of use time, large amount of alloy scrap are generated every year. Reuse of copper nickel alloy has become more and more important because of the shortage supply of copper and nickel resources. At present, there are many kinds of copper and nickel alloy waste processing method, but there are many defects for these methods.In order to realize the recovery of copper and nickel from nickel cupronickel scrap by direct electrolysis and grading electro-deposition method, study of passivation mechanism of copper nickel alloy, study of recovery of copper from Nickel cupronickel scrap by direct electrolysis method and study of Ni-Fe co-deposition process were taken in this paper. The results showed that nickel component in nickel cupronickel scrap can aggravate the passivation phenomenon, proper thiourea and glue concentration can increase the passivation time of the nickel cupronickel anode, the effect is most obvious when glue concentration is 8ppm or thiourea concentration is 4ppm. When Cu2+and H2SO4 concentrations were of 60 g/L and 180 g/L, Under the conditions of the electrolyte temperature 60℃, cathode current density 100 A/m and gelatin concentration 40 mg/L, the purity of smooth copper cathodes of 99.98% can be obtained. Iron’s electro-deposition plays a leading role in the Ni-Fe co-deposition process, and the co-deposition nucleation mechanism accords with a progressive nucleation; when the initial Ni+ and Na2SO4 concentrations were of 40 g/L and 100 g/L, smooth ferronickel deposit containing 96.21% Ni can be obtained under the conditions of the electrolyte temperature 60℃, Fe2+ concentration of no more than 0.3 g/L, solution pH of 3 and sodium dodecyl sulfonate concentration of 40 mg/L.Through the above research, this paper determined parameters of nickel cupronickel scrap by direct electrolysis and grading electro-deposition method, and realized the clean and efficient regeneration of copper and nickel. This also has great reference value for regeneration of other non-ferrous metals.