A process for manufacturing a rapid hardening portland cement clinker containing a calcium halo-aluminate having the formula; 11CaO.7Al.sub.2 O.sub.3.CaX.sub.2, in which X is a halogen, characterized by adding at least one sulfur compound selected from calcium sulfate, calcium sulfite and calcium sulfide...http://www.google.es/patents/US4028126?utm_source=gb-gplus-sharePatente US4028126 - Process for manufacturing rapid hardening portland cement clinker
Process for manufacturing rapid hardening portland cement clinker
