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Bureau of Mines / Minerals yearbook: Metals and minerals 1978-79
Year 1978-79, Volume 1 (1978-1979)

Schottman, Frederick J.; Kuck, Peter H.
Silicon,   pp. 793-799 ff. PDF (624.5 KB)


Page 793

  793Silicon 
By Frederick J. Schottman1 and Peter H. Kuck' 
 Consumption of silicon alloys and metal increased 7%, based on silicon content,
between 1977 and 1978. However, domestic shipments increased only slightly
in 1978 because of higher imports. Increased de 
mand in foreign markets during 1979 resuited in lower imports and higher
domestic production. Domestic prices rose as much as one-third between 1977
and 1980. 
DOMESTIC PRODUCTION 
 Shipments of silicon metal and alloys by domestic producers increased only
slightly in 1978 and 1979. Reflecting changes in demand, the increase was
concentrated in the 56% to 95% grades of ferrosilicon and in silicon metal.
 In March 1978 Cabot Corp. bought a 64% interest in Kawecki Berylco Industries,
Inc. (KBI) by purchasing stock held by Union Oil Co. of California and Pacific
Holding Co. Later in the year Cabot acquired the remaining KBI shares held
by other owners and merged with KB!. The National Metallurgical Division
of KBI produces silicon metal at Springfield, Oreg., while Cabot produces
fumed silica from silicon metal at Tuscola, Ill. In May 1978 BOC International,
Ltd., acquired control of Airco Inc. by 
means of a stock tender offer. At that time Airco was producing ferrosilicon
and other ferroalloys at Calvert City, Ky., and Niagara Falls, N.Y. The new
Airco Division then sold its ferrosilicon operations in July 1979. Airco's
two ferrosilicon plants were purchased by SKW Alloys, Inc., a subsidiary
of SKW Trostberg, a Federal Republic of Germany company with ferroalloy plants
in Canada and the Federal Republic of Germany. In September 1979 South African
Manganese Amcor, Ltd. (SAMANCOR) purchased the Roane Electric Furnace Co.
plant at Rockwood, Tenn., from Engelhard Minerals & Chemicals Corp.
The
Rockwood plant has a capacity of 18,000 short tons per year of 50% ferrosilicon
and is a significant producer of ferromanganese and siicomanganese. 


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