MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Solvent Extraction Separation of Silver(I) and Zinc(II) from Nitrate Leach Solution of Spent Silver Oxide Batteries with D2EHPA
Sung-Yong ChoWon-geun LeePan-Pan Sun
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2019 Volume 60 Issue 6 Pages 1090-1095

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Abstract

In this study, separation of silver(I) and zinc(II) from nitrate leach solution of spent silver oxide batteries were carried out by extraction and selective stripping. Di-(2-ethylhexyl) phosphoric acid (D2EHPA) was used to extract Zn(II) and Ag(I) in the equilibrium pH range of 0.99–1.34. The extraction of Zn(II) was more affected by the pH value than that of Ag(I). Zn(II) and Ag(I) loaded in D2EHPA was separated by selective stripping with a mixture of 0.01 mol/dm3 nitric acid and 1 mol/dm3 thiourea and 0.5 mol/dm3 nitric acid for Ag(I) and Zn(II), sequentially. A process flowsheet for the separation and recovery of Zn(II) and Ag(I) from the nitrate leach solution of spent silver oxide batteries was proposed.

Fig. 10 Process flow sheet for the separation of Ag(I) and Zn(II) from nitrate leaching solution. Fullsize Image
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© 2019 The Japan Institute of Metals and Materials
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