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1-pct NaCN solution alumina washcoat amount of PGM analyzed for PGM autoclave leach solution autoclave temperature black powder Bureau of Mines California Waste Extraction canister catalyst samples catalytic converters Chicago monolith decreased EP Tox Test filter cake Head tr oz/st HIGH-TEMPERATURE CYANIDE LEACHING Hydrometallurgical leach residues mg/L monolith catalyst monolith composite NaOH primary autoclave NaOH solution NaOH was added NP Not present oxidation and three-way passed the EP pct Rh pellet catalyst PGM dissolved pet PGM leached PGM recovery PGM-cyanide complexes platinum-group metals pregnant leach solutions pregnant solution process development unit produce a filter psig Pt and Pd Pt and Rh Pt Pd Rh repulp wash Residue tr oz/st residues passed Results in table Rh leached sintering slurry sodium cyanide sodium sulfate solution at 160 standard conditions Table 5 shows TCLP for Ba thermal hydrolysis total cyanide tr oz troy ounce unit with 1-pct VIRGIN 3-WAY MONOLITH virgin monolith