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Technical Cement Forum / Re: form of MgO in clinker, relation to Bogue relations
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Michael Clark
Michael Clark
Yes, up to a maximum of 2% MgO in clinker. The MgO does not partition equally between the clinker mineral phases. There is the greatest solid solubility in the C4AF phase, with the lowest in the C2S phase. The 2% overall limit is a compromise value taking these differing solid solubilities into account.
I do think there is merit in extended Bogue type calculations, but we must remember that they are only calculations. Microscopy or XRD should be used if we want to know the real clinker mineralogy.
Dr Michael Clark
Michael Clark
Michael Clark

I recommend the CemNet Kiln Chemistry course if such considerations are your real interest. The next course begins on 13th July and subscriptions are now open.

Dr Michael Clark

lalbatros
lalbatros

Thanks Michael.

It is interresting to know about MgO solubilities. Could you suggest me some readings on this topic?

Concerning Bogue calculations, since I am now busy with reviewing my recipe optimization programs, I can not rely on experimental data at all. I can of course work only with theoretical or empirical correlations.

For recipe calculations, would you advice me to refine the Bogue relations to account for minor components or would you keep them as simple "indicators" including only major oxides. Do you consider there is some good to go a bit more in these details?