A PROCESS FOR THE RECOVERY OF ADSORBED PALLADIUM FROM SPENT SILICA

The present invention relates to a process for the recovery of precious metals from spent catalysts or adsorbent or inorganic waste. More specifically a process is provided for the recovery of palladium from silica, which is used as an absorbent in column chromatography or as a catalyst support in m...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	HARI, CHAND BAJAJ, RAKSH, VIR JASRA, PRADYUT GHOSH, ARVINDKUMAR, BALVANTRAI BORICHA, PUSHIPITO, KUMAR GHOSH
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOUNDS THEREOF FERROUS OR NON-FERROUS ALLOYS INORGANIC CHEMISTRY METALLURGY NON-METALLIC ELEMENTS PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:	The present invention relates to a process for the recovery of precious metals from spent catalysts or adsorbent or inorganic waste. More specifically a process is provided for the recovery of palladium from silica, which is used as an absorbent in column chromatography or as a catalyst support in many catalysts. The process includes burning the spent silica to oxidize the organic component of the adsorbed Pd-complex, digesting the cooled residue with a mineral acid, filtering the obtained solution to separate out silica residue, adjusting the pH of the filtrate to remove precipitate impurities and raising the pH of the purified filtrate to recover a palladium salt.