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Leaching of petroleum catalysts with cyanide for palladium recovery.
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9535, 1995 Jan; :1-16
The U.S. Bureau of Mines has tested cyanide leaching for recovery of Palladium (Pd) from spent petroleum processing catalysts. Three different catalyst samples were supplied by Gemini Industries, a spent catalyst processor. These catalysts consisted of a zeolite base and contained 0.4 to 0.7 pct Pd. During alkaline cyanide leaching, the catalysts exhibited ion exchange properties due to their zeolite matrices. This could present a safety hazard due to the potential for release of toxic hydrogen cyanide gas. The catalyst leach residues passed the Federal Toxicity Characteristic Leaching Procedure and the California Waste Extraction Test, indicating that landfill disposal of the leach residues would be acceptable.
Precious-metals; Catalysts; Ion-exchange-resins; Chemical-properties; pH; Pyrolysis; Land-disposal; Palladium; Materials-recovery; Leaching; Cyanide; Waste-disposal
Report of Investigations
NTIS Accession No.
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9535
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division