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Rhodium separation

A PMG containing concentrate was treated with aqua regia.The filtrate was treated with NaOH and the pH was brought down to 4.0 to remove Iron content.The filtrate was a clear liquid and treated with Ammoniam Oxalate and heated. A white precipitate was obtained which on XRF scan shows Rh 42% Ca 30% Chlorine 25% and balance minor filtration impurities of original concentrate containing Iron. Can I get an advise if by this method, Rh really precipitates or is it only shown in XRF due to interference of Ca. If so, how would it be possible to separate out Ca. The concentrate is Magnatite Ore concentrate and also contains originally ppm levels of Pt,Ru,Pd.

Sharad Shah
Alchemist Processors - Bangalore, Karnataka, India
2004

Ed. note: Hello Sharad. This site's focus is industrial metal finishing, so your inquiry is a bit off topic and may not receive a response. But the subject has some commonality with metal finishing, so maybe we'll get lucky.

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