Is it from special rocks rich in iron or is it from scrap iron? Please answer
The main source of iron used in the production of sulfate-resistant cement is usually iron-containing raw materials such iron oxides, iron ore, and iron-rich clays. In order to attain the desired chemical composition, these ingredients are added during the cement production process. In particular, the iron component aids in the clinker's ferrite phase production, a critical process that creates cement that is resistant to sulphates. Because tricalcium aluminate (C3A) is very vulnerable to sulphate assault, the ferrite phases help improve the cement's resistance to sulphate. Manufacturers can create cement that is more resilient in sulfate-rich settings by regulating the iron concentration.