Bureau of Mines / Minerals yearbook: Metals and minerals 1978-79
Year 1978-79, Volume 1 (1978-1979)
Potter, Michael J.
Kyanite and related materials, pp. 503-506 PDF (439.3 KB)
CONSUMPTION AND USES PRICES The December 1978 and 1979 issues of NA Not available. FOREIGN TRADE 504 MINERALS YEARBOOK, 197 8-79 Table 1.—Synthetic mullite production in the United States Year . (shortbh) Value I 1975 24,150 $3,350 1976 42,230 5,453 1977 40,280 5,283 1978 38,080 5,442 1979 40,660 6,675 Conforming to established end use patterns, kyanite and related materials were consumed in 1978 and 1979 mostly in the manufacture of high-alumina or mulliteclass refractories and in lesser quantities as ingredients in some ceramic compositions. Domestic kyanite, already ground to minus 35 mesh as required by the flotation process used in its separation and recovery, was marketed either in the raw form or, after heat treatment, as mullite, which was sometimes further reduced in particle size before use. In the 35- to 48-mesh range, the miner- Engineering and Mining Journal, December 1978 and 1979, listed prices for kyanite, f.o.b. Georgia, ranging from $63 to $117 per short ton for bulk shipments and $9 more per ton for bagged material. Price ranges quoted for kyanite-group materials in Ceramic Industry magazine, January 1979 and 1980, follow: Per short ton 1978 1979 Mullite, calcined kyanite Mullite, calcined — — — — $105-$114 105- 139 $105-$114 139 Mullite, fused 725- 810 725- 810 Export data of kyanite and mullitecontaining materials are no longer collected* as a separate category by the Bureau of the Census. Data had been collected up until 1977, and these export figures were published in this section in what was then table 2 (U.S. exports and imports for consumption of kyanite and related minerals). However, these Census figures did not distinguish al was used mostly in monolithic refractory applications such as for high-temperature mortars or cements, ramming mixes, and castable refractories, or with clays and other ingredients in refractory compositions for making kiln furniture, insulating brick, firebrick, and a wide variety of other articles. More finely ground material, minus 200 mesh, for example, was used in body mixes for sanitary porcelains, wall tile, investment-casting molds, and miscellaneous special-purpose ceramics. Industrial Minerals (London) quoted kyanite-group price ranges approximately equivalent to the following (converted from pounds sterling per metric ton to dollars per short ton): Per sh 1978 ort ton 1979 Andalusite, Transvaal, bagged, cii. main European port Kyanite, South African, graded, c.i.f. main European port Kyanite, Indian, f.o.b. Sillimanite, Indian, natural, bagged,fo.b. Kyanite, Indian, calcined, f.o.b. Calcutta $164 NA 140 195 240 $190 220 NA NA NA between synthetic mullite and materials that were in part mullite. Import data for kyanite-group minerals have likewise not been collected as a separate category since 1977. From 1972 through 1976, 100 to 200 tons per year was imported, largely from India and the Republic of South Africa. In 1977, imports totaled 53 tons.
http://rightsstatements.org/vocab/NoC-US/1.0/| As a work of the United States government, this material is in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright