Report of Investigations 9428: High-Temperature Cyanide Leaching of Platinum-Group Metals from Automobile Catalysts - Process Development Unit

Details

• Journal Article:
  Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9428
• Personal Author:
  Atkinson, Gary B. ; Kuczynski, Robert J. ; Walters, Larry A.
• Description:
  The U.S. Bureau of Mines operated a 2,000-g (4.4-lb) batch process development unit for recovering platinum-group metals (PGM) from automobile catalysts. Virgin monolith, used pellet, and used monolith catalyst samples were tested. Leaching twice with 1-pct sodium cyanide (NaCN) solution at 160 deg. C for 1 h dissolved more than 95 pct of the PGM from virgin catalysts and more than 90 pct from used pellet catalysts. More than 85 pct of the PGM was dissolved from used monolith catalysts when a third autoclave step was added. Solid PGM concentrates containing more than 99.8 pct of the dissolved PGM and analyzing greater than 70 pct PGM were recovered by heating the pregnant leach solutions from virgin catalysts to 250 deg. C and used catalyst to 275 deg. C for 1 h. The solution after heating contained less than 0.2 ppm total cyanide. The virgin residues passed the EPA extraction procedure toxicity test (EP Tox Test), the EPA toxicity characteristic leaching procedure (TCLP), and the California waste extraction test (WET) for all elements except Ba. Adding sodium sulfate (NA2SO4) to the virgin leach residues reduced the amount of Ba dissolved to an acceptable level. The used leach residues passed the EP Tox Test for all elements but failed the WET and TCLP for Pb. [Description provided by NIOSH]
• Subjects:
  Air Pollutants, Occupational Cyanides Metals Metal Workers Occupational Health Platinum Safety
• Keywords:
  Metals; Metallurgy; Metallic-fumes; Metal-industry; Metal-fumes
• Source:
  Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9428, 1992 Jan; :1-11
• Series:
  NIOSH Numbered Publications   ; Mining Publications  
• Subseries:
  Report of Investigations
• Document Type:
  Text
• Genre:
  Report
• Place as Subject:
  California ; Nevada ; OSHA Region 9
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  RERC - Reno Research Center
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  17 pdf pages
• NIOSHTIC Number:
  nn:10011663
• NTIS Accession Number:
  PB93-188100
• CAS Registry Number:
  Carbon (CAS RN 7440-44-0) ; Carbon dioxide (CAS RN 124-38-9) ; Lead (CAS RN 7439-92-1) ; Nitrogen dioxide (CAS RN 10102-44-0) ; Sodium cyanide (CAS RN 143-33-9) ; Sodium sulfate (CAS RN 7757-82-6) ; Sulfuric acid (CAS RN 7664-93-9)
• Federal Fiscal Year:
  1992
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:b77bb1481725cbb8e66b1e1daf6aaa1153bb2bf6e0b4aaf0a537742a261e1b11cf918999964cacee6e5fe4febbd592670e9cf4d4ac9b6d594a1ac8244f016493
• Download URL:
  https://stacks.cdc.gov/view/cdc/10151/cdc_10151_DS1.pdf
• File Type:
  [PDF - 436.95 KB ]