1. Department of Chemical, Metallurgical & Materials Engineering, Tshwane University of Technology, P.M.B X680, Pretoria, 0001, South Africa
2. Department of Metallurgical and Materials Engineering, University of Nigeria, Nsukka, Private Bag 0004, Nsukka, Enugu State, Nigeria
3. Department of Agricultural and Bioresources Engineering, University of Nigeria, Nsukka, Private Bag 0004, Nsukka, Enugu State, Nigeria