Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Meisinger, Arthur C.
Perlite, pp. 905-907 ff. PDF (275.8 KB)
PERLITE 907 PRICES Producers sold crushed, cleaned, and sized crude perlite to expanding plants at an average price of $11.34 per short ton in 1972, and the portion used by producers in their own expanding plants was valued at an average of $11.50 per ton. The weighted average of both categories was $11.44 per ton which was the same value as in 1971. Expanded perlite sold or used, according to expanders, had an average value of $60.17 compared with $60.07 per ton in 1971. However, average values by States in 1972 ranged from $32 -to $144 per toss. WORLD REVIEW Greece.—Although 1972 production data for perlite in Greece were not available, production in 1971 was slightly lower than in 1970. The quantity of crude perlite ore produced in 1971 was 177,000 tons coinpared wi-th 185,800 tons in 1970. Processed perlite in 1971 amounted to 104,500 tons compared with 117,600 tons in 1970. The quantity of perlite exported by Greece in 1970 and 1971 averaged 15% of crude ore production and 95% of processed ore production, respectively. Phiippines.—The quantity of perlite produced from the Legaspi City deposit of Trinity Lodge Mining Corp. was only 480 tons in 1972—a slight increase from the 1971 production of 457 tons. TECHNOLOGY Grefco, Inc., a subsidiary of General Refractories Co., initiated installation of air pollution control systefns at its perlite processing plant in No Agua, N. Mex., and storage facilities in Antonito, Cob., in 1972. The estimated $1 million project was to be completed by mid-1973. Two product development research projects, sponsored by the Perlite Institute, New York, were completed duriu4g the year. One project involved the durability characteristics of perlite cement plasters (stucco). The other study, in two parts, was concerned with the physical properties of perlite insulating concrete with added diatomaceous earth and hydrated lime, and the effect of moisture migration for various vent boards used in roof deck construction.
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