TY - JOUR
T1 - Separation of Palladium and Silver from a Nitric Acid Solution by Liquid Surfactant Membranes
AU - Kakoi, Takahiko
AU - Goto, Masahiro
AU - Nakashio, Fumiyuki
N1 - Funding Information:
This work was partly supported by the research foundation from Nissan Chemical Foundation. The authors are grateful to Shoei Chemical Indus-try Co., Henkel Hakusui Co., Daihachi Chemical Industry Co. Ltd., and Mitsui CYTEC Co. Ltd., for the supply of palladium salt, silver salt, LIX 860, SFI-6, MSP-8, CYANEX 471X, and CYANEX 301.
PY - 1997
Y1 - 1997
N2 - The recovery of palladium from a nitric acid solution containing silver has been conducted by application of liquid surfactant membranes (LSMs) containing LIX 860, a β-hydroxyoxime, as a mobile carrier in a stirred tank. The extraction equilibria of palladium and silver using several different extractants were also studied. Palladium was selectively extracted from a silver-containing liquor with LIX 860 while it was also observed that both palladium and silver were extractable with a sulfur-containing extractant. The recovery of palladium with LIX 860 was selectively achieved by using perchloric acid solution as the LSM internal phase dosed with thiourea. In the LSM operation, the effects of several chemical parameters on the selective recovery of palladium were studied. The use of hydrochloric acid as an internal receiving phase prevented the transport of silver into the emulsion due to the formation of silver chloride in the external feed solution. Commercially available Span 80 was found suitable for the selective extraction of palladium as a surfactant in LSM operation. Under optimum conditions, palladium was successfully separated from silver and concentrated into a receiving phase in W/O emulsions.
AB - The recovery of palladium from a nitric acid solution containing silver has been conducted by application of liquid surfactant membranes (LSMs) containing LIX 860, a β-hydroxyoxime, as a mobile carrier in a stirred tank. The extraction equilibria of palladium and silver using several different extractants were also studied. Palladium was selectively extracted from a silver-containing liquor with LIX 860 while it was also observed that both palladium and silver were extractable with a sulfur-containing extractant. The recovery of palladium with LIX 860 was selectively achieved by using perchloric acid solution as the LSM internal phase dosed with thiourea. In the LSM operation, the effects of several chemical parameters on the selective recovery of palladium were studied. The use of hydrochloric acid as an internal receiving phase prevented the transport of silver into the emulsion due to the formation of silver chloride in the external feed solution. Commercially available Span 80 was found suitable for the selective extraction of palladium as a surfactant in LSM operation. Under optimum conditions, palladium was successfully separated from silver and concentrated into a receiving phase in W/O emulsions.
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U2 - 10.1080/01496399708000969
DO - 10.1080/01496399708000969
M3 - Article
AN - SCOPUS:0031148538
SN - 0149-6395
VL - 32
SP - 1415
EP - 1432
JO - Separation Science and Technology
JF - Separation Science and Technology
IS - 8
ER -