Diffusion dialysis and extraction integrated system for recovery of cobalt(II) from industrial effluent

摘要: Abstract This paper presents multistage hydrometallurgical separation of Co(II) from wastewater, achieved in an integrated system containing diffusion dialysis (DD) to decrease the acidity industrial effluent – pregnant leach solution (PLS), followed by precipitation Al(III), Fe(III) and Cr(III) hydroxides, selective extraction with bis(2,4,4-trimethylpentyl)phosphinic acid (Cyanex 272), stripping loaded organic phase form electrolyte. DD results indicate that minimum metal ion content dialysate high concentration H+ (1.5−3 M) can be conducting process at a low flow rate, but for longer time. The feed after was effectively purified Cr(III), Al(III) some admixtures Cu(II) ensure those metals will not disturb liquid-liquid pH 5.2. High distribution ratio values mean ions this selectively separated remaining present feed, especially Ni(II), transported phase. application H2SO4 as phases indicates more efficiently stripped most extract, thus forming rich electrolyte further electrodeposition metal. Finally, electrowinning model investigated preliminary showed good quality metallic cobalt deposited.