Method of processing calcium alpha hemihydrate

Details Method of processing calcium alpha hemihydrate Method of processing calcium alpha hemihydrate

C - Chemistry, Metallurgy

04

B

23/104, 261/73

C04B 11/00 (2006.01) C04B 11/024 (2006.01) C04B 24/06 (2006.01) C04B 28/14 (2006.01)

Patent

CA 1338921

A process for preparing calcium sulfate alpha hemihydrate essentially in the form of primary grain, brought to a degree of fineness corresponding to the strength development required for the intended application, the finest grain being removed by screening and at least one fruit acid and/or the salt(s) thereof being mixed in as a retardant and liquefier to obtain a product with a sufficiently retarded onset of setting, rapid strength development, and a high level of strength, which can be used in particular as spray mortar.

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