Steady state modelling, simulation and optimisation of a multi stage cobalt solvent extraction circuit
Evans, H.A., Bahri, P.A., Vu, L.T.T. and Barnard, K.R. (2014) Steady state modelling, simulation and optimisation of a multi stage cobalt solvent extraction circuit. In: CHEMECA 2014, 28 September - 1 October, Perth, Western Australia
The cobalt solvent extraction (CoSX) system using Cyanex 272 as the organic extractant, has been modelled for single, two and three stage extraction circuits using MATLAB and Aspen Custom Modeler (ACM) mathematical modelling software. Steady state simulations and optimisations have been conducted on the developed models. An initial sensitivity analysis has shown that increasing pH or the organic to aqueous (O:A) ratio significantly increases individual metal extraction efficiencies. However to achieve the ultimate aim of maximising cobalt extraction while minimising magnesium and nickel co-extraction and reagent consumption, an economic objective function has been formulated within the optimisation problem to solve for the optimum pH setpoint and O:A ratio. For this case study a two stage Co SX circuit with the (O:A) ratio at 0.162 and pH at 4.64 was found to be optimal. This set of conditions would achieve 99% cobalt extraction, while limiting magnesium co-extraction to 9% and nickel co-extraction to <0.5%.
|Publication Type:||Conference Paper|
|Murdoch Affiliation:||School of Engineering and Information Technology|
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