Extraction Of Cobalt From Spent CMB Catalyst Using Supercritical CO2

Abstract

The metal extraction from spent CMB catalyst using supercritical CO[2](scCO[2]) was investigated with single organic system, binary organic system and ternary organic system to extract metal ions. Leaching solution of spent CMB catalyst containing 389 mg L[-1] Co[2+], 187 mg L[-1] Mn[2+], 133 mg L[-1] Na[+], 14.97 mg L[-1] Ca[2+] and 13.2 mg L[-1] Mg[2+]. The method consists of scCO[2]/ligands complexation process and metal extraction process at 60°C and 200bar. The result showed the Co and Mn was selectively extracted from Mg, Ca and Na in the ternary system of mixture of Cyanex272, DEA and Alamine304-I.