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Technical Cement Forum / Addition of clinker dust to kiln

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David 14/10/2008 07:10:32

Addition of clinker dust to kiln

Hi;

In some cement plants slag is used in cement kiln. What I know is that slag has C₂S so it is used in clinker production to improve clinker C₃S and help to catalyze clinker formation reaction (Am I right!). So, if the clinker dust which produces from production process of clinker has more C₂S why we can't re-feed it again to the kiln inlet (like slag)? how does it affect the clinker formation reaction by adding it?

thank you

Michael Clark 14/10/2008 09:30:40

David,

Slag is added to the inlet of the kiln in the Cemstar process. It does contain C2S and other minerals from the CaO-SiO2-Al2O3 ternary system and it does catalyse the clinker formation. It also has been calcined so reduces CO2 emissions per tonne of clinker produced. In those things you are right. Which dust from the clinker production process are you referring to? If it is dust from the cooler that is normally added to the finished clinker stream from the cooler. There will be no advantage in adding it to the kiln inlet as it is fully combined and will just have to reheated again absorbing thermal energy.

Thanks

Dr Michael Clark

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