Bureau of Mines / Minerals yearbook: Metals, minerals, and fuels 1972
Year 1972, Volume 1 (1972)
Wells, J. Robert
Talc, soapstone and pyrophyllite, pp. 1191-1199 ff. PDF (988.5 KB)
TALC, SOAPSTONE, AND PYROPHYLLITE 1199 A patent was gran1~ed for a process in which *talc, clay, feldspar, wollastonite, or other ceramic materials are combined in an aqueous mixture with an approximately equal quantity of exfoliated vermiculite, and that mixture is pressed into shapes that are then dried, fired, and glazed to produce strong and lightweight disposable containers.15 In a process for which a patent was granted, an aqueous dispersion of pyrophyllite is applied to one surface of a paper form, after which the object is dried, coated with a glazing material, and fired to vitrify the glaze and consume the combustible base, thus producing inexpensive, thin-walled ceramic ware to be discarded after a single use.'6 "Hardy, P. W., and 0. M. Peterson (assigned to American Can Co.). Method of Making Glazed Ceramic Bonded Expanded Vermiculite Articles. U.S. Pat. 3,689,611, Sept. 5, 1972. ' °Simmen, F. G. (assigned to Hall China Co.). Manufacture of Disposable Ceramic Dishes From High-Alkali Pyrophyllite. U.S. Pat. 3,655,843, Apr. 11, 1972.
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