Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Minor metals, pp. 1347-1358 PDF (1.4 MB)
1347Minor Metals By Staff, Division of Nonferrous Metals CONTENTS Page Arsenic 1347 Cesium and rubidium 1349 Germanium 1350 Indium 1352 Radium 1353 Page Scandium 1354 Selenium 1354 Tellurium 1356 Thallium 1358 ARSENIC 1 Domestic Production.—Arsenic trioxide was produced in the United States as a byproduct of base-metal ores, primarily cop~ per ore, at the Tacoma, Wash., plant of the American Smelting and Refining Company. Production figures cannot be published. Production in 1972, however, rose substantially over that in 1971 which had been curtailed by the strike at copper facilities. Shipments were less than production and yearend stocks continued the upward trend begun in 1968. Consumption and Uses.—Apparent consumption of arsenic, essentially all as white arsenic (As203), decreased slightly from that in 1971. Calcium and lead arsenate chemicals were the major end products. Minor quantities of arsenic were used in sodium arsenate and other chemical compounds. Production of calcium arsenate has trended downward since 1968 when nearly 1,700 tons was produced. Less than 600 tons was produced in 1969 and in 1970, and only 470 tons was -produced in 1971. Lead arsenate, on the other hand, rose to nearly 3,100 tons in 1971 from 2,100 tons in 1970. Arsenic is primarily used for its toxic qualities in the agricultural industry for insecticides, selective plant killers, defoliants, and for parasitic control in chicken feed; arsenic compounds continued to be used as wood preservatives. Consumption of Wolman Salts, the principal arsenic preservative, -totaled 1,085 tons in 1971 compared -with 806 tons in 1970. About 3% of the arsenic consumed is used as metal for alloying with lead and copper. Sm-all quantities of high-purity arsenic are used in the electronics industry. Prices.—The price of refined white arsenic, 99.5%, at New York docks, in barrels, small lots, has been unchanged at 6-1,4 -to 6-% cents per pound since July 6, 1968. Refined white arsenic in bulk carload lots at Laredo, Tea., was $120 -per ton, and crude white arsenic was quoted at $94 per ton at T:acoma, Wash. Lead arsenate in 50-pound bags was quoted at 26 to 29 cents per pound throughout 1972. Arsenic metal was quoted in London at £600 -nominal per long -ton (64.3 cents per pound) until mid-May when it rose to £650 (69.5 cents). In July the price rose to £690 per metric ton (75.1 cents per pound) where it remained through yearend. Foreign Trade.—No exports of arsenic metal or white arsenic have been reported since 1945. Imports of white arsenic declined 21% in 1972 to 13,600 tons, the lowest level since 1960. Sweden, the principal supplier of white arsenic, furnished 60%, followed by Mexico with 26%, and France with 11%. 1Preparedby Gertrude N. Greenspoon, mineral specialist.
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