Process and apparatus for producing calcium sulfate microfibers

Details Process and apparatus for producing calcium sulfate microfibers Process and apparatus for producing calcium sulfate microfibers

C - Chemistry, Metallurgy

01

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23/104, 23/385

C01F 11/46 (2006.01) B01J 19/18 (2006.01) B01J 19/24 (2006.01) C04B 11/02 (2006.01) C04B 14/38 (2006.01) C30B 7/00 (2006.01)

Patent

CA 2024146

ABSTRACT OF THE DISCLOSURE Process and apparatus for producing larger diameter, high aspect ratio, calcium sulfate microfibers are provided. The process involves passing a steam heated dilute aqueous slurry, containing about 1/2% - 15%. gypsum by weight, under pressure, first through a plug flow stage wherein slender, needle-like crystals are formed, and then through a stirred-flow stage wherein the crystals are grown both axially and radially. The implementing apparatus includes means for mixing the slurry with steam to rapidly raise the slurry temperature, and a plug-flow pipe reactor connected to a continuous stirred tank reactor.

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