Recovery of cobalt and molybdenum from consumed catalyst using hydrochloric acid

Abstract Cobalt and molybdenum are valuable metals whose presence in nature is very limited. The consumed catalyst, which abundantly available the petroleum refinery industry, a potential source of those metals. A hydrometallurgical process using acid as leaching agent usually used to extract separate more effectively. This method considered capable yielding recovery higher percentage metal. In this study, hydrochloric solutions at various concentrations 1.0, 1.5 2 M were used. catalyst was obtained from Pertamina Refinery Unit IV, Cilacap, Indonesia. Leaching experiment carried out for 300 minutes sampling undertaken 1, 3, 5, 15, 30, 90 minutes. particle size agitation speed fixed 200 mesh 400 rpm. Samples analyzed EDXRF before process. solution ICP-EOS. Experimental results have shown that cobalt increases with increase either concentration or temperature. highest recoveries 34.66% 5.03%, respectively, temperature 60°C.