Associate Professor Jonas Addai-Mensah
Contact Details
Tel: +61 8 8302 3673
Fax: +61 8 8302 3683
Email: jonas.addai-mensah@unisa.edu.au
Position
Associate Research Professor
Qualifications
BEng(Hons) UST, Ghana MSc TIIT, Israel PhD Queensland
Background
Jonas Addai-Mensah is a Chemical Engineer by training and has blended this background with expertise in colloid and surface science. Jonas obtained his
BEng(Hons) degree from University of Science and Technology, Ghana, MSc from Technion, Israel Institute of Technology, Haifa, Israel and
his PhD from the University of Queensland, Brisbane. During his postgraduate years and since joining the Ian Wark Research Institute at the start of 1993, he has actively pursued research activities in the area of solid-liquid processing and separation, with applications to minerals, material and waste liquor processing and environmental cleaning.
Research Interests
The current research interests of Jonas include:
- Enhanced dewatering of mineral and particulate dispersions
- Industrial crystallization
- Particulate fouling of process heat exchangers and vessels
- Control of particle size and network structure through, coagulation, flocculation, and cementation/agglomeration and
- Colloidal particle interactions: surface forces and rheology of mineral dispersions
Current Projects
Improving the dewatering behaviour of mineral dispersions through interfacial chemistry and particle interactions (Minerals Industry / AMIRA Project P523A).
Sodium aluminosilicate and diuranate chemistry and crystallization behaviour in support of high level nuclear waste processing and evaporator fouling mitigation. (Westinghouse Savannah River (S. Carolina, USA) Project).
Influence of crystal growth modifiers on gibbsite crystallization from Bayer liquors (Ondeo Nalco Project).
Jonas has authored over 80 refereed journal and conference publications which cover the above research activities. He actively supervises
PhD, Masters and Honours degree students who undertake fundamental and applied research using world class facilities and equipment.
Selected Publications
Hasson, D. Addai-Mensah, J. and Metcalfe, J. "Filterability of Gypsum Crystallized in Phosphoric Acid Solutions in the Presence of Ionic Impurities", Journal of Industrial Engineering and Chemistry Research, 29. 867 - 875, (1990).
Addai-Mensah, J. Surface and structural characteristics of gibbsite precipitated from pure, synthetic pregnant Bayer liquor, Minerals Engineering 10(1), 81-96 (1997).
Addai-Mensah, J., Dawe, J. Counter, J., Prestidge, C. A. and J. Ralston, The unusual colloid stability of gibbsite at high pH, J. Colloid and Interface Science 203, 115-121 (1998).
Addai-Mensah, J. and Ralston, J. The influence of interfacial structuring and forces on gibbsite interactions in synthetic Bayer liquors, J. Colloids and Interface Science 215, 124-130 (1999).
Prestidge, C., Ametov, I. and Addai-Mensah, J. Rheological investigations of gibbsite particles in synthetic Bayer liquors, Colloid and Surfaces A 157 (1-3) 137-145 (1999).
Counter, J. Addai-Mensah, J. and Ralston, J. The formation of Al(OH)3 crystals from supersaturated sodium aluminate solutions revealed by cryo-vitrification-transmission electron microscopy, Colloid and Surfaces A 154, 389-398 (1999).
Li, J., Prestidge, C. A. and Addai-Mensah, J. The Influence of alkali metal ions on homogeneous nucleation of Al(OH)3 crystals from supersaturated caustic Aluminate Solutions, J. Colloids and Interface Science 224, 317-324 (2000).
Li, J., Prestidge, C. A. and Addai-Mensah, J. Secondary nucleation of gibbsite crystals from synthetic Bayer liquors: effect of alkali metal ions, J. Crystal Growth, 219, 451-464 (2000).
Mpofu, P., Addai-Mensah, J. and Ralston, J. The influence of hydrolysable metal ions on the interfacial chemistry, particle interactions and dewatering behaviour of kaolinite dispersions, J. Colloid and Interface Science, 261 349-359 (2003).
Mpofu, P., Addai-Mensah, J. and Ralston, J. Investigation of the effect polymer structure type on flocculation, rheology and dewatering behaviour on kaolinite dispersions, Int. J. Mineral Processing, 71 247-268 (2003).
Mpofu, P., Addai-Mensah. J. and Ralston, J. Temperature influence of non-ionic polyethylene oxide and anionic polyacrylamide flocculation and dewatering of kaolinite dispersions, J. Colloid and Interface Science, 271 145-156 (2004).
Mpofu, P., Addai-Mensah, J. and Ralston, J. Flocculation and dewatering behaviour of smectite dispersions: Effect of polymer structure type, Minerals Engineering 17(3) 411-423 (2004).
Barnes, M.C., Addai-Mensah, J. and Gerson, A.R. Smart, St.C. The solubility of SiO2 in synthetic spent Bayer liquor seeded with sodalite and cancrinite, Journal of Colloids and Surfaces A 157 (1-3) 101-116 (1999).
Barnes, M.C., Addai-Mensah, J. and Gerson, A.R. The kinetics of desilication of synthetic spent Bayer liquor and sodalite crystal growth, Colloids and Surfaces A 147, 283-295 (1999).
Barnes, M.C., Addai-Mensah, J. and Gerson, A.R. A methodology for quantifying sodalite and cancrinite phase mixtures and the kinetics of the sodalite to cancrinite phase transformation, Mesoporous and Macroporous Solids 31 303-319 (1999).
Barnes, M.C., Addai-Mensah, J. and Gerson, A.R., The mechanism of the sodalite-to-cancrinite phase transformation in synthetic spent Bayer liquors, J. Microporous and Mesoporous Materials 31, 287-302 (1999).
Barnes, M.C., Addai-Mensah, J. and Gerson, A.R. The kinetics of desilication of Synthetic Spent Bayer Liquor seeded with cancrinite crystals, J. Crystal Growth 200, 251-264 (1999).