Re: C4AF

Dear Mr.Ted Krapkat,

Thanks for answering on my behalf.I am fully agree with your given answer.

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Re: C4AF

Dear Mr Ted,

First, i thanks to your supports. The reason i want to increase the concentration of C4AF in the clinker phase because i want to improve the colour of clinker but not take place some modified in the chemical composition raw mix or coal composition also.

My factory's clinker has a well colour (brown - not yellow core) but i want to improve better (dark - not yellow core). I have been knowing that there are too much objects which are affect on the colour of clinker and i also known the coating in the kiln getting fluctuation, un uniformly and collapsed when we have to modified the chemical composition of raw mix and further it may be damage to kiln shell. I want to modify something in the burning process to improve the colour of clinker better than now but burning behaviour is keep stable.

I haven't got more experiences in this topic.

That is a completion of situation image.

Best Regards.

HongMinh.

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Re: C4AF

As far as my experience, Mn2O3 addition will give darker colour to clinker.Mn2O3 act as a flux and necessary correction in Fe2O3 content has to be made while calculation of phase composition of clinker by Bogue.

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Re: C4AF

HongMinh,

Okay, I understand.

In my experience, brown clinker can be produced from excessively hard burning or reducing conditions in the burning zone. You can use the Magotteaux test for reducing conditions to see if that may be the cause, or you could try burning a bit softer and see what effect that has on the colour.  The method for the Magotteaux test is here ;-http://www.cemnet.com/cs/forums/permalink/2597/2605/ShowThread.aspx#2605

The porosity of the clinker nodules is important too. Very dense nodules (without many open pores) restrict the access of oxygen into the clinker during the primary cooling phase. If this is the case softer burning may fix this.

Raj is correct about Mn2O3 darkening the colour of cement and Mn2O3 does not appear to have any significant effect on cement properties below a level of about 1%. But adding Mn2O3  would be a last resort and not really recommended unless you have access to a cheap, convenient source of high Mn2O3 raw materials. 

 Hope this helps...

 Best regards,

 Ted.

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