Collective PtPdIr Trace Precipitation By An Organic Agent
(selective for Pt Pd Ir, selective against Rh Ru, Cu Ni Pb and other base metals)

some globally active refiners still rely on old pollutive aqua regia refining; you too ?
this process can help to recover values and minimize waste

useful separation scheme for

typical process data

1. Pt Pd Ir trace precipitation from highly acidic spent process liquors / filtrates after aqua regia treatment followed by inefficient classical Pt Pd Ir salt precipitation

=> this is a values recovery process

no prior neutralization
no additional salination of liquors
replacing unselective cementations avoiding base metal dilution

typical pregnant liquor /feed
10 - 100 mg/l Pt, Pd, Ir
10 g/l Cu, Ni, Pb
typical yield
> 99 %  Pt, Pd, Ir recovery
in the precipitate
< 5 mg/l Pt, Pd, Ir each
in the barren liquor
> 95% Cu, Ni, Pb
in the barren liquor

2. Pt Pd Ir trace precipitation in Rh concentrate solutions; process may be part of the Rh refining cycle => this is a purification process

superior simplicity of rhodium purification

typical pregnant liquor /feed
3 - 10 g/l Rh
> 10 mg/l Pt, Pd, Ir traces
typical yield in purified concentrate
> 95 % Rh

Please note : A level of 100 ppm Pt in a filtrate at 1000 USD/troz means a value of approx. 3220 USD/m3 !

HEV •  Halwachs Edelmetallchemie und Verfahrenstechnik
D-63571 Gelnhausen · Rhönstraße 106 · phone 0049-6051-968928 · email:  ·  internet : ·  AGB ·  IMPRESSUM

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