Abstract
In this study, the electrolytic foam separation process was used to treat metal‐chelate solutions at varying pH values and with varying surfactant chelating agent to metal (S/M) ratios. The ionic competition characteristics of the metal‐chelate systems and the partitioning of chelates during the electrolytic foam separation process were also investigated by the 1H FT‐NMR method. Results of the 1H FT‐NMR analysis showed that, in the Ni‐citrate‐NDDTC(sodium diethyl dithiocarbamate) system with an S/M ratio of 4, the Ni‐NDDTC chelate formation efficiencies for pH values of 4, 7, and 10 were 87%, 100%, and 93%, respectively. These results were consistent with measurements of efficiency of Ni removal following 90 minutes of flotation including that the efficiency of Ni removal in the Ni‐citrate‐NDDTC system was highest at pH=7 (95%), and was lower at pH=4 (38%) and pH=10 (74%). This investigation demonstrates that both the pH value and the S/M ratio are critical parameters for metal removal from the metal‐citrate(EDTA)‐NDDTC(KEtX) system. The study also shows that the 1H FT‐NMR can be used successfully to understand the nature of ionic competition and chelate partitioning in these systems.
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