1. The main components of ordinary portland cement are limestone, clay and iron ore powder. It is made by grinding and mixing limestone, clay and iron ore powder in proportion, and the mixture at this time is called raw meal. Then it is calcined at about 1450℃, and the calcined product is called clinker. Then the clinker and gypsum are ground together and mixed in proportion, which is called cement.
2. Additives Portland cement is mainly composed of limestone, clay, iron ore powder and additives.
It adds other substances into ordinary portland cement in proportion and according to certain processing procedures to achieve special effects, such as slag cement, pozzolanic portland cement, fly ash portland cement, composite portland cement and so on. The raw materials of these cements are mixed materials that are more active or inactive than the original ordinary portland cement.
3. The main components of special cement are limestone and other components. It's just that the material stage and manufacturing process are somewhat different. For example, the raw materials of high alumina cement (aluminate cement) are bauxite and limestone, which are calcined to obtain clinker and then ground into aluminate cement. /0 b46 f 2 1 FBE 096 b 63300 c 18b 30 1338744 ebf 8 AC 38？ x-BCE-process = image % 2f resize % 2Cm _ lfit % 2Cw _ 600% 2Ch _ 800% 2c limit _ 1% 2f quality % 2Cq _ 85% 2f format % 2Cf _ auto