Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Sutton, Joseph A.
Columbium and tantalum, pp. 461-471 ff. PDF (1.2 MB)
COLUMBIUM-TANTALUMTable 6.—Consumption of ferrocolumbium, ferrotantalum-columbium, and other columbium and tantalum materials in the United States in 1972, by end use End use 465 Pounds of contained columbium plus tantalum Steel: Carbon 733,216 Stainless and heat resisting 644,936 Full alloy 302,740 High strength-low alloy 1,141,089 Electric W Tool W Superalloys 665,300 Alloys (excludes alloy steels and superalloys) 57,387 Miscellaneous and unspecified 131,736 Total 3,676,404 W Withheld to avoid disclosing individual company confidential data; included in "Miscellaneous and unspecified." STOCKS The following ycarend columbium and tantalum materials (given in pounds) were reported in inventories: Material Dec. 31, 1971 Dec. 31, 1972 COLUMBIUM Primary metal Ingot Scrap Oxide Other compounds 60,303 45,324 67,503 1,051,357 ' 527,976 55,984 62,826 75,483 553,800 142,539 TANTALUM Primary metal Capacitor-grade powder Ingot Scrap Oxide 269,249 163,320 86,452 ' 272,359 ' 106,700 267,975 154,871 56,074 232,039 90,386 Potassium tantalum fluoride (K,TaF7) Other compounds ' 246,760 53,536 163,606 12,802 Revised. Stocks of columbium and tantalum raw materials, as reported by consumers and dealers at yearend 1972, were as follows (in short tons—l971 figures in parentheses): Columbite, 1,104 (521) ; tantalite, 1,120 (1,322); pyrochlore, 501 (595); tin slag, 33,775 (35,787); and other, 61 (none). Consumers inventories of ferrocolumbium and ferrotantalum-columbium as of December 31, 1972, were as follows (with 1971 yearencl stocks in parentheses): Ferrocolumbiurn, 814,607 pounds contained columbium (758,828); ferrotantalum-columbium, 18,592 pounds contained columbium plus tantalum (34,737); and other columbium and tantalum materials, 40,061 pounds contained columbium plus tantalum (31,818). Producer stocks of ferrocolumbium at yearend 1972 were 638,000 pounds contained columbium (534,000). PRICES Prices for columbite and pyrochlore, as reported by Metals Week, were higher at the end of 1972 than at -the end of 1971. Columbite ore, c.i.f. U.S. ports, increased from $0.75—$0.85 per pound of contained pentoxides for material having a Cb205-toTa205 rat-jo of 10 to 1 at the beginning of the year to $l.10—$1.l5 per pound at year- end. Contract rates for Canadian pyrochlore, fo.b. mine and mill, went from $1.15—$l.20 per pound of Cb2O5 content to $1.37 after being down to $0.95 in the first quarter. Those for Brazilian pyrochlore similarly went from $1.15 to $1.37. Spot prices for tantalite ore, 60-percent basis, c.i.f. U.S. ports, were quoted at $6.25—$6.75 per pound Ta205 at the beginning of the year and $5.25—$6.00 per pound at yearend. Quoted prices for various grades of ferrocolumbium were unchanged during the year: Low-alloy standard grades, ton lots, f.o.b. shipping point, $2.45—$2.65 per pound of columbium content; high-purity grades, $4.l2—$6.8l. -The price of columbium and tantalum metal remained unchanged during the year. Columbium powder was quoted at
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