useful separation scheme for

process data

1. rhodium precipitation
from main stream pgm refinery liquors

benefits
replacing salt precipitations or cementations

pregnant liquor /feed
5 - 15 g/l Rh
Cu, Pb, Se, (Fe) main constituents
Pt, Pd, Ir minor constituents

yield and recovery
> 99% Rh recovery in precipitate
> 99.9% Rh purity in precipitate
base metals and minor constituents Pt, Pd, Ir left in filtrate

2. separation of Rh traces
from PtPdIr pgm refinery liquors

benefits
replacing repeated salt precipitations

pregnant liquor /feed
0 - 2 g/l Rh
base metals Cu, Pb, Se, (Fe)
Pt, Pd, Ir main constituents
yield
up to > 99% Rh recovery in precipitate depending on feed

3. separation of Rh traces
from Cu and Se rich Sherrit leach liquors

benefits
avoiding Rh losses in Cu-cathodes

pregnant liquor /feed
0 - 1 g/l Rh
Cu, Ni main constituents
Pb, Se, Fe, Pt, Pd, Ir minor constituents

yield
> 95% Rh recovery up to 99% in precipitate depending on feed