Skip directly to search Skip directly to A to Z list Skip directly to page options Skip directly to site content

NIOSHTIC-2 Publications Search

Search Results

High-temperature cyanide leaching of platinum-group metals from automobile catalysts - a process development unit.

Authors
Kuczynski-RJ; Atkinson-GB; Walters-LA
Source
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9428, 1992 Jan; :1-11
Link
NIOSHTIC No.
10011663
Abstract
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.
Keywords
Metals; Metallurgy; Metallic-fumes; Metal-industry; Metal-fumes
CAS No.
143-33-9; 7757-82-6; 7664-93-9; 10102-44-0; 124-38-9; 7439-92-1; 7440-44-0
Publication Date
19920101
Document Type
Report of Investigations
Fiscal Year
1992
NTIS Accession No.
PB93-188100
NTIS Price
A03
Identifying No.
RI-9428
NIOSH Division
RERC
Source Name
Reno, NV: U.S. Department of the Interior, Bureau of Mines, RI 9428
State
CA; NV
TOP