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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)


Page 504

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. 


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