Application of diffusion dialysis for reduction of acidity of real pregnant leach solutions containing Ni and Co ions |
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| Authors: | Małgorzata Janiszewska Andrea Arguillarena Magdalena Wajs Katarzyna Staszak |
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| Affiliation: | 1. Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan, Poland;2. Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Poznan University of Technology , Poznan, Poland;3. Department of Chemical and Biomolecular Engineering, University of Cantabria , Santander, Spain |
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| Abstract: | ABSTRACT Diffusion dialysis (DD) was proposed as a pretreatment step to reduce the acidity of real sulfate/chloride pregnant leach solutions containing cobalt(II) and nickel(II). Optimum DD conditions that enable reduction of acidity in the feed while maintaining a high rejection level of metal ions present in PLS were proposed, e.g. for 0.06 dm3/min flow of both aqueous phases H+ concentration in the dialysate reached 3.8 and 2.99 M for PLS1 and PLS2, respectively. Acid diffusion coefficients varied from 0.32 ?10 ?6 to 3.15?10?6 m/s and decreased with increasing phase flow rates. Moreover, dialysate neutralization was beneficial for the H+ reduction in the feed. |
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| Keywords: | Diffusion dialysis pregnant leach solutions sulfate/chloride Cobalt(II) Nickel(II) recovery |
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