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Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)

West, J. M.
Platinum: group metals,   pp. 1043-1054 PDF (1.2 MB)


Page 1046

 1968 ' 496,155 721,479 9,443 1,612 44,776 10,446 ' 1,283,911 
 1969 ' 531,703 758,738 14,218 1,472 50,144 17,194 rl,373,469 
 1970 ' 474,654 739,343 10,905 1,707 48,897 21,289 ' 1,296,795 
1971: 
 Chemical 135,112 218,651 8,342 1,490 14,910 10,440 388,945 
 Petroleum ' 141,800 2,916 447 -- 176 9 r145,348 
 Glass 40,703 237 635 -- 3,362 -- 44,937 
 Electrical 51,940 431,505 2,619 -- 9,084 4,351 499,499 
 Dental and medical 23,097 61,594 611 631 31 236 86,200 
 Jewelry and decorative .. 18,577 18,752 1,104 -- 5,419 5,298 49,150 
 Miscellaneous 19,859 26,451 1,754 5 1,384 2,184 51,637 
 Total ' 431,088  760,106  15,512 2,126  34,366 22,518 rl,265,716 
 225,895 292,710 12,429 
 96,424 14,499 16,725 
 26,970 2,250 58 
 92,381 425,081 4,042 
 30,462 94,274 376 
 20,655 19,375 1,565 
 50,089 27,835 2,559 
Revised. 
1,997 
374 
14 
12 
 15,358 40,984 589,373 
 149 -- 127,797 
 13,923 -- 43,201 
 7,867 6,542 535,913 
 48 441 125,975 
 6,593 1,810 50,012 
 2,157 4,899 87,551 
Total 542,876 876,024 37,754 2,397 46,095 54,676 1,559,822 
STOCKS 
1046 MINERALS YEARBOOK, 1972 
subsequent rulings under the Environmental Protection Agency's proposed standards.
In pursuing efforts to meet the 1975 requirements, a variety of combinations
of platinum and other potential conversion compounds in or on various supporting
media were under test. Generally, a combination of platinum and palladium
in a 5:2 ratio was found acceptable, with possibly a small addition of ruthenium
or other platinum-group metal.4 Estimates for the precious metal values involved
in each unit ranged, generally, from $5 to $15. Overall cost per converter
unit, containing coated ceramic pebbles or a ceramic honeycomb structure,
was substantially higher owing to fabrication expense. Problems of use and
maintenance of emission controls were outlined.5 Most car manufacturers had
made some commitment by yearend to purchase or manufacture platinum-based
catalytic devices for their automobiles. Meanwhile, industry efforts were
directed toward development of new types of engines or other means of propulsion
that would be efficient but non-polluting. 
 Availability of a special palladium catalyst on a ceramic support was announced
for use in controlling nitric acid pollution, 
especially from nitric acid plants but also from incinerators, etc., that
may require controls when new standards are passed.6 A platinum metals catalyst
of undisclosed composition found use in small quantities for safety purposes
in nudear reactors by preventing hydrogen from reaching explosive concentrations.~
A new rhodium plating process was announced for producing a highly reflective
decorative finish,8 and favorable electroplating properties of rhodium were
described.9 Alloy Metals, Inc., introduced a group of new silver-palladium-aluminum
alloys for brazing titanium, beryllium, zirconium, and dissimilar metal assemblies.'0
 Metals Week. Precious Metals: Platinum and Palladium In At Detroit. V. 43,
No. 40, Sept. 29, 1972, p. 1. 
 Chemical Week. EPA Clears the Air for Catalysts. V. ill, No. 19, Nov. 8,
1972, pp. 19—21. 
 6 American Metal Market. Researcher Hails Palladium as Acid Pollutant Fighter.
V. 79, No. 4, Jan. 6, 1972, p. 13. 
 American Metal Market. Platinum Metals Said Performing Vital Nuclear Safety
Function V. 79, No. 219, Nov. 30, 1972, p. 11. 
 8 Metals Week. Elsewhere in Precious Metals. V. 43, No. 26, June 26, 1972,
p. 6. 
 American Metal Market. Properties of Rhodium Well-Suited for Electroplating.
V. 79, No. 233, Dec. 20, 1972, p. 2a. 
 10 American Metal Market. New Brazing Alloys Use Palladium. V. 79, No. 5,
Jan, 7, 1972, p. 13. 
Table 5.—Platinum-group metals sold to consuming industries in the
United States 
(Troy ounces) 
Year and industry Platinum Palladium Iridium Osmium Rhodium Ruthenium Total
1972: 
Chemical 
Petroleum__________ 
Glass              
Electrical__________ 
Dental and medical 
Jewelry and decorative - 
Miscellaneous 
 Stocks of platinum-group metals held by refiners, importers, and dealers
increased 5% during the year, to 896,677 ounces. In- 
creases in stocks of individual metals were as follows: Palladium, 28%; rhodium,
11%; and ruthenium, 1%. Platinum, in- 


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