Materials Transactions Online

Materials Transactions, Vol.58 No.05 (2017) pp.829-833
© 2017 The Japan Institute of Metals and Materials

Recovery of Silver from the Nitrate Leaching Solution of a Spent Ag/α-Al2O3 Catalyst by Solvent Extraction and Reduction

Pan-Pan Sun1, Bong-Jo Rho1 and Sung-Yong Cho1

1Department of Environment and Energy Engineering, Chonnam National University, Gwangju 61186, Republic of Korea

Nitric acid was employed to strip silver from loaded 5,8-diethyl-7-hydroxy-dodecan-6-oxime (LIX63) in the recovery of silver from a leaching solution of a spent Ag/α-Al2O3 catalyst. The loaded LIX63 was obtained by contacting the real leaching solution with 0.5 mol/dm3 LIX63 diluted in kerosene. In order to produce silver powder by reduction, the HNO3 in the stripping solution was recovered by extraction with tri 2-ethylhexyl amine (TEHA) followed by stripping with distilled water. Silver powder was obtained by reduction with 0.1 mol/dm3 L-ascorbic acid. A flowsheet was proposed to recover Ag from the leaching solution of the spent Ag/α-Al2O3 catalyst by solvent extraction and reduction with minimum waste emissions.


(Received 2017/01/17; Accepted 2017/02/20; Published 2017/04/25)

Keywords: silver, nitric acid, TEHA, solvent extraction, recovery

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