Obtaining Nickel Concentrates from Sludge Produced in the Process of Electrochemical Metal Surface Treatment

Abstract The article presents the possibility of recovering nickel from waste produced as a result wastewater neutralization during electrochemical surface treatment metals. Leaching sludge with concentrated hydrochloric acid enabled metals contained in precipitate to solution efficiency 74.4% (Se) 100% (Zn). content elements was determined using ICP-OES method. next step precipitation obtained various reagents. precipitating reagents used were 0.5 M sodium hydroxide solution, sulphide and 1% dimethylglyoxime solution. Selective made it possible obtain concentrates ranging 15.3 98.2% for first two methods, whereas case third method based on concentrate purity 94.3%. process leaching nickel-dimethylglyoxime complex (Ni-DMG) sulphuric crystallization obtaining 99.4% sulphate, which can be reused plating selected research shows that generated electroplating plants is potentially important source recycled concentrates.