Junji Shibata1, Sanji Nishimura1 and Shigeru Mukai2
1Department of Chemical Engineering, Faculty of Engineering, Kansai University, Suita
The extraction of Zn and Cd from ammoniacal solution with D2EHPA and Versatic Acid 911 diluted in benzene was studied and the effect of ammonia on these extractions was clarified. The extraction of these metals with D2EHPA is not affected by ammonia, while the extraction with Versatic Acid 911 is considerably hindered. This is also recognized from the consideration by the average ligand number of metal ammine complex. The theoretical values obtained on the hypothesis that the metal ammine complex is not extracted into the organic phase are in good accord with the experimental results of Zn extraction. But there is a difference between the theoretical and experimental values of Cd extraction. The addition of p-nonyl phenol to the organic phase raises the extraction of these metals, especially in the pH region where the extraction is hindred by the formation of the metal ammine complex. The separation of Cd from a binary solution of Zn and Cd was tried and it was confirmed that the extraction under the optimum pH and ammonia concentration, and the scrubbing of the extract with Cd solution are required.
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