Study of selective removal of CoS and NiS during purification of MnSO₄ electrolyte

• Main Author: Dube, Vuyiswa
• Other Authors: Lewis, Alison Emslie
• Format: Dissertation
• Language: English
• Published: University of Cape Town 2015
• Subjects: Chemical Engineering
• Online Access: http://hdl.handle.net/11427/13710

This research project investigated the selective removal of Co²⁺ and Ni²⁺ from a Co-Ni-Mn system through sulphide precipitation. The Co²⁺ and Ni²⁺ ions have adverse effects on the purity of the manganese product, thus, have to be removed via precipitation in a purification step. The main objective of this research was to understand the influence of local supersaturation on the purification process. This was important for controlling such a process to achieve residual ion concentrations of 0.3 ppm and 1.0 ppm for Co²⁺ and Ni²⁺ ions respectively, with minimum loss of the Mn²⁺ ions.