1156 posts
Burning Question 31
We have faced the serious coating formation at 12 to 26 meter of Kiln and plant have to be forced stopped for coating removal. I am attaching the three files for your observations:
1. photograph of the Kiln coating.
2. Observation about the breakdown.
3. Analysis data for coating, Rawmix and coal.
I may request you to please look into the coating formation details and furnish us your valuable comments.
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1156 posts
Re: Burning
I have studied the data you have submitted. We receive regular reports of heavy coating and ball formation associated with petcoke firing. I note that on the 12th & 13th, prior to the kiln stoppage the petcoke firing in the kiln had been increased to 70 per cent. However, the clinker sulphate levels are not excessive and neither is the sulphate in the coating sample. One othet item of note is that the MgO content of the clinker has risen to above 1.5 per cent on the 11th, 12th and 13th. In my experience only minor changes in the MgO content can lead to significant changes in the coating tendency of the kiln and also the formation of clinker balls. Do you know the reason for the increase in MgO content?
1156 posts
Burning Question 32
We have problem of hard clinker used in cement grinding. This clinker is produced by using 100 per cent pet coke in firing. Although chemical composition of clinker is correct. It has 50 per cent C3S, 5.5 per cent C3A, & liquid approx 28.5 per cent & SO3 in clinker 1.6 per cent. But minerology observed under microscopy reveals following: Mineralogical composition and Granulometry of - 6 mm clinker: Phases present Quantity (per cent) Granulometry (size in micron) Min. Max. Average required size Alite (C3S) 46.5 8 82.69 42.14 20 Belite (C2S) 34.5 3.5 93.00 38.26 15 Liquid phase (C3A+C4AF) 18.6 Porosity Low porous 22 120 65 (more data attached) Photomicrographs are given in attachment. Kindly suggest How to reduce Alite grain size & increase porousity of clinker. Our kiln is already running in full RPM. Is it possible to make softer clinker by changing chemical composition.
1156 posts
Re: Burning
I have looked at the photomicrographs and read your analysis with interest. In order to properly answer your questions I would have to ask Dr Chromy to examine and analyse the mineralogy of the clinker. I'm afraid that Dr Chromy would charge for that and therefore Aditya Birla would have to pay. I will contact Mr Modi and Mr Agrawal to see whether they want me to refer this to Dr Chromy. One we have his analysis then we might be in a position to suggest the means to reduce the alite grain size and make softer clinker by adjusting the chemical composition.