Hydrometallurgical Recovery of Cobalt(II) from Spent Industrial Catalysts

Abstract

The work presents studies on the application of hydrometallurgical recovery of cobalt(II) from solutions after leaching spent industrial catalysts used in process of hydrodesulfurization. A four-stage process was proposed, which consists of: leaching, precipitation of metal hydroxides accompanying Co(II), extraction of Co(II) with bis(2,4,4-trimethylpentyl)phosphinic acid and Co(II) stripping from the organic phase. The results indicate that by using the proposed method it is possible to leach Co(II) and Mo(VI) from spent catalyst, and remove main impurities such as Al(III), Fe(III) in hydroxide precipitation step and separate Co(II) from Mo(VI) by extraction and stripping.

Pertraction of Co(II) through Novel Ultrasound Prepared Supported Liquid Membranes Containing D2EHPA. Optimization and Transport Parameters

“…All this makes the recovery of cobalt from raw materials and secondary sources very interesting from both environmental and economic reasons. Different techniques have been described for cobalt removal from aqueous solutions, including flocculation [5], adsorption [6][7][8][9], biosorption [10][11][12], phytoremediation [13], solvent extraction [14,15], ion exchange [16] capacitive deionization [17], electrowinning [18], micellar enhanced ultrafiltration [19], nanofiltration [20], reverse and forward osmosis [21,22], membrane distillation [23], liquid membranes [24][25][26][27] and combined methods [28].…”

Separation of Al(III), Mo(VI), Ni(II), and V(V) from model hydrochloric acid leach solutions of spent petroleum catalyst by solvent extraction

“…[9][10][11] The valuable metals are then separated from the leach solution by precipitation, 12 solvent extraction, or ion exchange. 4,13 For example, molybdenum and cobalt are separated from the leach chloride solution of spent catalysts by solvent extraction with TBP (tributylphosphate) and Alamine 308 (tri-isooctylamine), respectively. 14 Ion exchange resin like Dowex M4195 was employed to adsorb nickel from a sulfuric acid leach solution of spent hydrodesulfurization (HDS) catalysts.…”

“…Many efforts have been made to recover metals from spent catalysts by employing processes such as roasting with salts, 3 acid leaching, 2,4 bioleaching, 5 electrolysis, 6 alkali leaching, 7 and chlorination 8 . A process combining these methods can enhance the efficiency of metal dissolution into the leach solution 9–11 .…”

Spent sulfuric acid plant catalyst: valuable resource of vanadium or risky residue? Process comparison for environmental implications

“…For many years, research efforts have been undertaken to find efficient solutions for catalyst utilization. Two methods that have been considered for this were deoiling or decoking and metal extraction or recovery (Al-Sheeha et al 2013;Wiecka et al 2020). Using unprocessed spent catalysts in the production of new catalysts or using them as additives to other useful materials also has been explored through the years (Furimsky and Biagini 1996;Trochez et al 2015;Marafi et al 2017).…”

“…However, pyrometallurgy has huge disadvantages, namely the need for special equipment and high energy consumption. Moreover, concentrated metals must be refined (Ding et al 2019;Pathak et al 2020;Wiecka et al 2020). Therefore, the application of hightemperature treatment is limited from both environmental and economic viewpoints.…”