Title:
METHOD OF SEPARATING AND RECOVERING NOBLE METAL
Document Type and Number:
WIPO Patent Application WO/2007/080648
Kind Code:
A1
Abstract:
A method of noble-metal separation/recovery by which noble metal ingredients
can be efficiently isolated by a simple procedure using an easily available adsorbent
and eluent. The method comprises passing through a cellulose column a metal hydrochloric-acid
solution prepared by treating a metallic material with hydrochloric acid, passing
a mixture of hydrochloric acid and 2-propanone to elute the noble metal ingredients
adsorbed on the cellulose while developing them and thereby separate the metal
hydrochloric-acid solution into a fraction containing light platinum-group
metals and a fraction containing heavy platinum-group metals and gold, further
separating the fraction containing light platinum-group metals into fractions
respectively containing palladium, ruthenium, and rhodium using that mixture,
separating the fraction containing heavy platinum-group metals and gold into
fractions respectively containing gold, osmium, iridium, and platinum using
a mixture of hydrochloric acid and 1-butanol, and then separately recovering
the noble metals from the respective fractions as the elemental metals.
Inventors:
NIISAWA KAZUHIRO (JP)
SHIMIZU KAZUO (JP)
NOZAKI TADASHI (JP)
SHIMIZU KAZUO (JP)
NOZAKI TADASHI (JP)
Application Number:
PCT/JP2006/300356
Publication Date:
July 19, 2007
Filing Date:
January 13, 2006
Export Citation:
Assignee:
NIISAWA KAZUHIRO (JP)
SHIMIZU KAZUO (JP)
NOZAKI TADASHI (JP)
SHIMIZU KAZUO (JP)
NOZAKI TADASHI (JP)
International Classes:
C22B11/00
Foreign References:
| JP2004518813A | 2004-06-24 | |||
| JPH0813053A | 1996-01-16 |
Attorney, Agent or Firm:
AGATA, Akira (3rd Floor Ikeden Building, 12-5, Shimbashi 2-chome, Minato-k, Tokyo 04 ., JP)
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