How to refine metal palladium

First, 1450 kg of waste palladium catalyst was pre-treated by roasting and solvent washing, and then the analytical solution was concentrated, filtered, and the residue was recovered. The filtrate was acidified and complexed (acidification and complexation were performed twice each), and hydrazine hydrate was reduced to obtain sponge palladium.

Roasted materials: Through leaching, resin exchange, analysis, purification and refining, a total of 3749.6 g of sponge palladium was obtained. Washing materials: Through leaching, resin exchange, analysis, purification and refining, a total of 12282.1 g of sponge palladium was obtained. A total of 16031.7 g of sponge palladium was obtained. ICP analysis showed that the purity of sponge palladium reached 99.98%, and the purity met the 99.95% palladium powder requirement in the national standard “GB/T 1420-2004 Sponge Palladium”.

A single column of 50 kg wet resin can adsorb about 1500 g of palladium with a resolution of 99.8%. The actual resolution is also proven to be above 98%. The main reason for the low roasting recovery is that the adsorbed palladium in the first empty R410 resin is fixed and cannot be completely resolved.