Patent ID: 6190449
Filing Date: 2001-02-20
Classification: C04B,Y02P

Abstract:
A method for manufacturing a belitic sulfo-aluminous aluminous cement comprising:(a) neutralizing waste sulfurous acids containing from 1 to 35 weight % of acid by adding thereto clay-calcareous fines to produce gypsum;(b) preparing a belitic crude cement from residues of washings of calcareous stones, said calcareous stones having a composition comprising:20-30 weight % CaCO.sub.330-50 weight % clay5-25 weight % SiO.sub.25-25 weight % Al.sub.2 O.sub.35-50 weight % of waste products comprising metal, oxides;(c) adding the gypsum obtained from step (a) to the belitic cement obtained from step (b) form a belitic sulfo-aluminous cement.