Process for the preparation of asbestiform crystalline...

Details Process for the preparation of asbestiform crystalline... Process for the preparation of asbestiform crystalline...

C - Chemistry, Metallurgy

01

B

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C01B 25/445 (2006.01) C01B 25/45 (2006.01)

Patent

CA 1262029

PROCESS FOR THE PREPARATION OF ASBESTIFORM CRYSTALLINE CALCIUM SODIUM METAPHOSPHATE FIBERS ABSTRACT OF THE INVENTION Asbestiform crystalline calcium sodium metaphosphate fibers are prepared by (a) forming a homogeneous melt of substantially crystalline calcium sodium metaphosphate having a composition on a dry basis equivalent to a CaO/Na2O/P2O5 mol percent ratio of about 29.0-34.0/16.0-18.0/50.0-53.0 and a degree of crystallinity from about 60% to about 75% as deter- mined from density and differential thermal analysis measurements, (b) supercooling the homogeneous melt, (c) seeding the supercool melt with calcium sodium metaphosphate crystals, (d) maintaining the seeded supercooled melt at the seeding temperature under isothermal conditions for a time sufficient to form crystalline blocks of calcium sodium metaphosphate, and (e) fiberizing the crystalline blocks.

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