a raw mixture for the production of cement consisting of calcareous , aluminous , silicaceous , ferrous , magnesium - containing components and calcium chloride ; said components being contained in the raw mixture in the following proportions , per cent by weight : ______________________________________ calcareous component 30 to 42 . 3silicaceous component 12 . 5 to 17 . 5aluminous component 1 . 6 to 12 . 4ferrous component 0 . 6 to 4 . 4magnesium - containing component 1 . 5 to 8calcium chloride 6 to 20losses at calcination the balance . ______________________________________ the above composition makes it possible to perform calcination of the raw mixture at substantially lower temperatures and to obtain cement possessing a higher activity .