Journal of
Chemical Engineering and Materials Science

  • Abbreviation: J. Chem. Eng. Mater. Sci.
  • Language: English
  • ISSN: 2141-6605
  • DOI: 10.5897/JCEMS
  • Start Year: 2010
  • Published Articles: 92

Article in Press

Purification of cobalt solutions in several solvent extraction steps: Using MEXTRAL and D2EHPA as extractants

Mulaja Tshakatumba Constantin*, Tshipeshi Makina Héritier, Ngoy Moïse Raphael Moramess and Mwema Mutamba Edouard

  •  Received: 17 January 2021
  •  Accepted: 08 March 2021
A sulphate solution of cobalt (18.93 g/L Co2+) containing major impurities such as copper (1.35 g/L Cu2+) , iron (0.28 g/L Fetot), zinc (0.70 g/L Zn2+) and manganese (4.83 g/L Mn2+) was purified through the solvent extraction method using two extractants; MEXTRAL and D2EHPA for the removal of copper and for the removal in two stages of a zinc-iron-manganese complex respectively. The effects of the solution’s pH, the O/A ratio, the extraction time and the stirring intensity were investigated. The purification extend was enhanced by optimizing these four parameters through Taguchi’s L16 (4^4) experimental. The final solution obtained through sequential extractions showed a reduction in Cu, Fe, Zn and Mn content of 98.7%, 97.5%, 98.2%, and 80.5% respectively. This study showcased the possibility of obtaining high purity cobalt as a precursor for Lithium Ion Battery applications, representing 49 % of its current global use. The coextraction value of cobalt was estimated at 6.2%.

Keywords: Purification, MEXTRAL 984N, D2EHPA, cobalt, SX