The article focuses on the process of separation of Co(II) and Ni(II) ions extracted from 3−4 M hydrochloric acid solutions by supported liquid membranes, containing tri-noctylamine or trialkylbenzylammonium chloride in 1,2- dichloroethane, during galvanostatic electrodialysis. It is determined how the current density, composition of the liquid membrane and aqueous solutions affect the rate and selectivity of the cobalt(II) transport. An effective separation of cobalt(II) from nickel(II) is achieved. Maximum separation factors of 147 (equimolar mixture), 330 (nickel(II) in excess) and more than 400 (cobalt(II) in excess) are obtained under optimum conditions.