Pigments from spent Zn, Ni, Cu, and Cd electrolytes from electroplating industry

One of the problems electroplating industry is periodic discharge concentrated spent electrolytes together with rinsing wastewater. This leads to irreversible loss valuable components, as well risk heavy metal ions entering environment, which have toxic, mutagenic, and carcinogenic effects. The paper presents research on processing from zinc, nickel, copper, cadmium plating, collected over 3 years. Pigments various colors were obtained by precipitation phosphate, hydroxide, sodium carbonate. By their properties, i.e., whiteness 95–97%, residue after sieving a sieve up 0.04 wt.%, etc., resulting pigments are not inferior those currently presented world market. Following previous studies, basic technological scheme for waste production proposed. Processing according proposed technology will make it possible reduce concentration acceptable values (0.13–0.65 mg/L) discharge. ensure stable uninterrupted operation local treatment facilities industry.