Processing of rayon waste effluent for the recovery of zinc and separation of calcium using thiophosphinic extractant

Solvent extraction of copper, nickel and zinc by Cyanex 272

“…Equal volume of aqueous, containing 20 mg/L nickel, 500 mg/L copper and 20 mg/L zinc with 0.1 M [  2 4 SO ] and 0.25 M [Ac -], and organic phases of 0.1 M Cyanex 272 were equilibrated in 100 ml Stoppered conical flask by shaking it using wrist-action shaker for 20 min at room temperature. Extraction of nickel reaches equilibrium within a maximum period of 1 min (Bhaskara and Reddy, 2002), and equilibrium is attained rapidly, usually 2 to 3 min for copper (Sole and Hiskey, 1995) and 5 min for zinc (Jha et al, 2007) using Cyanex 272. However, contact time of 20 min, allowed to ensure that equilibrium was reached.…”

Adsorption of copper from the sulphate solution of low copper contents using the cationic resin Amberlite IR 120

“…Generally, the metallic ions from effluents are removed by precipitation with lime/caustic soda and sulphide, etc. It consumes large quantity of chemicals to effectively decrease the metal contents to acceptable pollution norms and generates sludge, which needs costly disposal procedure as landfill [5,6]. Other treatment procedures for the removal and recovery of metals from solutions are evaporation, solvent extraction, ion exchange, reverse osmosis, membrane separation [7,8].…”

Recovery of zinc from effluent of plants and mines

“…Recovered Zinc is directly returned to the plant. After extraction of zinc, a final purification of effluent is carried out by lime neutralization before discharge [4].…”