Process for the manufacture of stabilised, hardenable...

Details Process for the manufacture of stabilised, hardenable... Process for the manufacture of stabilised, hardenable...

C - Chemistry, Metallurgy

01

F

23/103

C01F 11/46 (2006.01) C04B 11/00 (2006.01)

Patent

CA 1045340

ABSTRACT OF THE DISCLOSURE This invention is directed to a process for the manufacture of stabilised, hardenable calcium sulphate and in particular calcium sulphate hemi-hydrate. The product is obtained by reacting crude phosphate with sulfuric acid and washing the calcium sulphate with an aqueous medium. The process is characterised in that the calcium sulphate is washed with aqueous solutions of condensed and complex aluminium fluorides of the general formula MeAlF4, Me2AlF5 and Me5Al3F as well as AlF3.nH2O in which Me represents an alkali metal, ammonium or thallium-I ion and n is a number between 1 and 9

226031

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