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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)


Page 1198

1198 MINERALS YEARBOOK, 1972 
TECHNOLOGY 
 In an annual review of materials used for ceramic processing, an industrial
journal presented informative summaries on the nature, occurrence, and applications
of a number of talc-group minerals and related materials.3 Research was successfully
concluded in an effort to develop an advantageous method for beneficiating
western talc ores in which the mineral is present in the soft, platy form.
The procedure finally selected was characterized as an attrition-scrubbing
sedimentation process.4 The research program of the Bureau of Mines included
experiments to evaluate the possible use of talc, glass fiber, and dicyclopentadiene
in a sulfur matrix for building purposes. No expedient was discovered for
combating destructive changes found to take place in the composites upon
aging, and the outlook was considered to be unfavorable. 
 The raw materials (including talc and pyrophyllite), as well as the technologically
advanced methods and equipment recommended for efficiently fabricating them
into ceramic tile were discussed in a journal article,5 and another article
reviewed operations of a specific installation where those materials and
techniques similar to those advocated are being employed.6 Some of the technologic
considerations involved in the utilization of a particular type of talc in
a specified application were the subject of an article.7 A detailed description
of the emission-abatement program at facilities of a major talc producer
was presented at a professional society meeting and was made available in
booklet form.' 
 Particles of platy talc ore of cosmetic grade are effectually delaminated
in a patented procedure by being subjected to a variety of selective forces
that achieve maximum reduction in the thickness of the particles while leaving
their lengths and widths relatively unchanged. The resulting low-density,
high-slip product is described as lustrous and possessing optimum texture
and lubricity so as to be exceptionally suitable for use in body powders.9
Talc and graphite were specified to serve as thickeners for mixing with finely
divided polytetrafluoroethylene and colloidal chrysotile asbestos to be combined
with a major proportion of a lubricating oil in a 
patented formulation for a high-pressure lubricating grease.'0 A patent was
issued for an improved printing ink, composed of ground talc, a pigment,
and polyamide epichlorohydrin dispersed in a solvent.l1 
 A process and equipment were patented for accelerating granules of talc,
or other mineral substances, through a nozzle to supersonic velocities in
order to pulverize the material by the standing shock wave so produced.12
Finely divided talc, either micaceous or granular and *amounting to as much
as 50% of the total weight, can be added to a specified organic material
to produce a patented substrate that will receive a metal surface suitable
for electroplating.'3 A process was patented for reacting talc, lithium carbonate,
sodium carbonate, and aqueous sodium silicate to produce a substance that
can be dried for use in catalytic applications normally served by certain
naturally occurring materials of the montmorillonite clays group.'4 
 Ceramic Industry Magazine. Steatite. V. 100, No. 1, January 1973, p. 28.
 Cordierite V. 100, No. 1, January 1973, p. 58. 
 Pyrophyllite. V. 100, No. 1, January 1973, p. 96. 
        Sericite. V. 100, No. 1, January 1973, 
p. 99. 
         Talc. V. 100, No. 1, January 1973, 
p. 107. 
 Wonderstone. V. 100, No. 1, January 1973, p. 112. 
 4Roe, Lawrence A. High Purity Talc From Western Ores. Pres. at Fall Meeting,
Soc. Mm. Eng. AIME, Birmingham, Ala., Oct. 18—20, 1972, Preprint 72—11—312,
16 pp. 
 ' Altschuler, Otto. The Ideal Tile Plant. Ceram. md. Mag., v. 99, No. 2,
July 1972, pp. 36—37. 
 6 Jordan, Roy, Jr. Flamingo Tile: Maverick Methods, Rewarding Results. Ceram.
Age, v. 88, No. 5, May 1972, pp. 15, 18—19. 
 ' O'Shaughnessy, James G. Reformulating Calcium Base Pigments With New York
State Talc. Amer. Paint J., v. 56, No. 34, Feb. 7, 1972, pp. 
15—17. 
 8 Erdman, G. R. Dust Control at Gouverneur Talc Company, Inc. Pres. at Fall
Meeting, Soc. Mm. Eng., AIME, Birmingham, Ala., Oct. 18—20, 1972, Preprint
72—H—39, 16 pp. 
 ' Ashton, W. H., and R. S. Russell. Talc Beneficiation. U.S. Pat. 3,684,197,
Aug. 15, 1972. 
 10Curtis, G. C. (assigned to Esso Research and Engineering Co.). Extreme
Pressure Grease. U.S. Pat. 3,639,237, Feb. 1, 1972. 
 11 Schneider, D. J. (assigned to Howard Paper Co.). Bleed Resistant Ink.
U.S. Pat. 3,642,502, Feb. 15, 1972. 
 12 Dille, R.M., and W. C. Schlinger (assigned to Texaco, Inc.). Fluid Energy
Grinding Method and System. U.S. Pat. 3,643,875, Feb. 22, 1972. 
 13 Peppe, W., H. M. Khelghatian, and A. J. Lutz, Jr. (assigned to Standard
Oil Co.). Talc Filled Metallizable Polyolefins. U.S. Pat. 3,663,260, May
16, 1972. 
 14 Orlemann, J. K. (assigned to Pfizer, Inc.). Process for Producing Synthetic
Hectorite-Type Clays. U.S. Pat. 3,666,407, May 30, 1972. 


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