Bureau of Mines / Minerals yearbook: Metals and minerals 1977
Year 1977, Volume 1 (1977)
Potter, Michael J.
Kyanite and related materials, pp. 547-551 ff. PDF (564.9 KB)
DOMESTIC PRODUCTION 547Kyanite and Related Materials By Michael J. Potter1 Kyanite, andalusite, and sillimanite are anhydrous aluminum silicate minerals that are alike in both composition and use patterns and have the same chemical formula, Al203*Si02. Related materials include synthetic mullite, dumortierite, and topaz, also classified as aluminum silicates, although the last two additionally contain substantial proportions of boron and fluo rine respectively All of these kyanite group substances can serve as raw materials for manufacturing special highperformance refractories in the highalumina category, but there has been no record in recent years of significant utilization of either dumortierite or topaz for this purpose in the United States. Although published statistics are not sufficiently complete to be wholly conclusive, it appears that the United States, India, and the Republic of South Africa are the leading world producers of kyanite-group minerals. It can be presumed that the U.S.S.R. and perhaps a few other industrialized nations Kyanite was prodi,iced in the United States in 1977 at three open pit mines, two in Virginia and one in Georgia. Kyanite Mining Corp. operated the Willis Mountain mine in Buckingham County, Va., and the Baker Mountain mine in adjoining Prince Edward County, Va. C-E Minerals, Inc., operated the Graves Mountain mine in Lincoln County, Ga. Domestic kyanite output in 1977 was slightly higher in tonnage and value than in 1976. Kyanite production statistics for 1977 (as well as for all previous years since 1949) are withheld to avoid disclosing company also produce significant quantities of these materials. U.S. kyanite production in 1977 was slightly higher in tonnage and value than in 1976. The amount of kyanite-group material exported decreased compared with that of 1976. The tonnage of imported material continued to be small. Legislation and Government Programs.— The allowable depletion rates for kyanite, established by the Tax Reform Act of 1969 and unchanged through 1977, were 22% for domestic production and 14% for foreign operations. On November 17, 1977, the Federal Government announced the offering of 2,816 tons of kyanite for sale on a sealed-bid basis. On December 5, 1977, 150 to~is of kyanite was sold to one company at a total sales value of $41,250. The General Services Administration was conducting bid openings for the sale of the kyanite on the fourth Tuesday of each month. proprietary data. Synthetic mullite production showed a slight decrease in both tonnage and value compared with the 1976 figures, and output was largely of the high-temperature sintered variety. The four producers of this material were A. P. Green Refractories Co. at Philadelphia, Pa.; C-E Minerals, Inc., at Americus, Ga.; Harbison-Walker Refractories Co. at Eufala, Ala.; and Taylor Refractories Division, NL Industries, Inc., at Greenup, Ky. Electric-furnace-fused mullite was produced by The Carborundum Co. at Niagara Falls, N.Y.
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