Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Wells, J. Robert
Kyanite and related materials, pp. 689-693 ff. PDF (598.6 KB)
PRICES 35 mesh 48 mesh 100 mesh 200 mesh 325 mesh Per short tons $58 62 65 73 Nominal 690 MINERALS YEARBOOK, 1972 DOMESTIC PRODUCTION Kyanite was produced in the United States in 1972 from three open pit mines, two in Virginia and one in Georgia. In addition to the hard-rock production, a minor quantity of kyanite-sillimanite concentrate was recovered in the process of extracting titanium and zirconium minerals from a beach sand deposit in Florida. 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. E. I. du Pont de Nemours & Co., Inc., operated the Trail Ridge mine and mill in Clay County, Fla. Domestic kyanite output in 1972, as measured by the quantity sold or used, was fractionally lower in both tonnage and total value than in 1971. Specific kyanite production statistics for 1972 (as well as for all previous years since 1949) are withheld because the predominant position of the two major producers would make publication of even national totals a disclosure of each firm's confidential data. Synthetic mullite, produced in 1972 by eight companies at operations in seven States, amounted to 16% less in tonnage than in 1971 and 18% less in total value. The 1972 output consisted predominantly of high-temperature sintered material, the average unit value of which was substantially below that reported for fused material. Leading in tons produced were Babcock & Wilcox Co., Richmond County, Ga.; Mullite Corp. of America, Sumter County, Ga.; H. K. Porter, Inc., Fairfield County, Conn.; and Charles Taylor & Sons, Inc., Greenup County, Ky.; whose combined outputs amounted to 86% of the 1972 national total. Table 1.—Synthetic mullite production in the United States (Short tons and thousand dollars) Year Quantity Value 1968 1969 1970 1971 1972 36,014 48,588 55,516 55,077 46,389 5,758 6,847 8,840 4,945 4,080 CONSUMPTION AND USES Kyanite and related minerals, conforming to the established end-use pattern, were consumed in 1972 mostly in the manufacture of high-alumina or mullite class refractories and in lesser quantities as ingredients in some ceramic compositions. Imported Indian kyanite was calcined in its natural lump form, after which it was usually separated into designated particlesize ranges for use chiefly as a grog. Domestic kyanite already ground to minus 35 mesh, as required by the flotation process used in separating it from the accompanying quartz gangue, was marketed in the raw form or after heat treatment, as mulEngineering and Mining Journal, December 1972, listed the following prices per short ton (unchanged from December 1971 quotations) for kyanite, f.o.b. Georgia, in bags (bulk shipments $2.00 less per ton): lite, which was sometimes further reduced in particle size. In the 35- to 48-mesh range, the mineral was employed mostly in refractories applications such as for hightemperature mortars or cements, ramming mixes, and castable refractories, or with clays and other ingredients in refractory compositions for the making of kiln furniture, insulating brick, firebrick, and other refractory articles of a wide variety of types. More finely ground material, minus 200 mesh for example, was used especially in body mixes for sanitary porcelains, wall tile, precision casting molds, and miscellaneous special-purpose ceramics.
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