In our plant we produce 42.5n but limstone in cement mill we use 20percent. The main probleam is our cement is coming to light. I dont want light cour like these.
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re Cement pridaction
The only realistic ways to reduce the lightness of your cement are to;-
(a) Lower the amount of limestone in the cement.
(b) make the clinker colour darker by increasing the iron content (or by adding 1-2% manganese oxide to the raw mix.)
Both will increase your cost/tonne cement.