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Application of diffusion dialysis for reduction of acidity of real pregnant leach solutions containing Ni and Co ions

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journal contribution
posted on 2019-07-05, 05:17 authored by Małgorzata Janiszewska, Andrea Arguillarena, Magdalena Wajs, Katarzyna Staszak, Magdalena Regel-Rosocka

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.

Funding

This work was supported by the Ministry of Science and Higher Education [Grant No. 03/32/SBAD/0910].

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