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Palladium can be recovered from a palladium-tin single step bath by the following process.
English (United States)
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Recovery of Palladium from Seeder Baths
Palladium can be recovered from a palladium-tin single step bath by the
Black particles of Pd-Sn alloy are precipitated from the seeders by oxidizing
the Sn (II) in solution with 30percent H(2)O(2) and/or air. The black solid which
settles out leaves a clear liquid which contains H(2)O, HCl and SnCl(4). The
liquid is removed, and the black solid is washed with D.I. H(2)O one or two times,
and allowed to settle. After all clear liquid is removed, the wet black solid is
treated with concentrated nitric acid which converts the tin to the highly insoluble
metastannic acid. After all of the tin has been oxidized, the clear solution, which
is separated for the solid metastannic acid containing H(2)O, HNO(3), and
Pd(NO(3))(2) can be used as a source of chemically pure Pd(NO(2))(2). This
material has a higher value than the Pd/Sn solid. One can electroplate the
solution to get palladium metal, if desired. This method also conserves palladium
in case of scarcity.