The treatment of cobaltickel solutions using CYANEX~circleR extractants

摘要

Bis(2,4,4-trimethylpentyl)phosphinic acid, R_2P(O)OH, is available from Cytec as CYANEXcircleR272 extractant. Originally developed in the early 1980's, its use to recover cobalt from nickeliferous solutions is now well established with commercial plants operating in Europe, South America, Africa, Australia, Canada and China. The properties which make CYANEXcircleR272 an almost ideal extractant for cobalt recovery are discussed in both theoretical and practical terms. Additionally, the potential use of its dithio analogue, bis(2,4,4-trimethylpentyl)dithiophosphinic acid, in cobalt-nickel recovery is described briefly.