1. Mineral Processing and Technology Research Center, Department of Metallurgy, Faculty of Engineering and the Built Environment, University of Johannesburg, Doornfontein, South Africa
2. Department of Mechanical Engineering Science, Faculty of Engineering and the Built Environment, University of Johannesburg, Johannesburg, South Africa
3. Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Doornfontein, South Africa