41 posts
TimePosted 04/10/2010 15:49:55

Re: Pet Coke

A Very resourceful article entitled "Regulatory standards and their revision for petcoke use" By S P Ghosh and K Mohan was published in international workshop on petcoke By National Council for cement and building materials and CMA INDIA. i strongly feel one must read it before attempting the use of petcoke


high SO3 Content resulting from High "S"  petcoke effects the strength of cement.


higher alkali ( `over 0.8% Na2O) and higher SO3

Resulted high early strength 10% at the expense of 10-15% decrease in 28d strength


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Bhaskar Agate
84 posts
TimePosted 04/10/2010 17:32:39

Re: Pet Coke

Dear Gulam,

It has been experienced that whenever we changed over from coal to pet coke firing in precacalciner kiln, clinker granulometry  became finer, clinker was difficult to grind and also there was a fall in 28 days strength.Besides this lot of excessive coating formations in cyclones which we used to clean periodically.


Bhaskar Agate


108 posts
TimePosted 05/10/2010 04:05:52
Dastgir says

Re: Pet Coke

Dear Hussaini,

Are you in possession of that article. Please mail it me.




Gulam Dastgir


57 posts
TimePosted 05/10/2010 14:30:13

Re: Pet Coke

On all three questions, the answer should be "it depends on your kiln"

1. Overburning can be avoided by good training of your operators. You may also avoid it by rotating the kiln faster. On the other hand, the extra SO3 from the sulphur of the Petcoke modifies the liquid phase and usually results in dustier clinker which is harder to grind.

2. This depends on your actual burner, you current fuel and type of kiln and current operation. If you already have high momentum burner and an easy to burn raw meal, it may not be necessary to increase primary air and/or kiln back end oxygen so much. If you are currently burning high ash coal with high o2 at kiln inlet, you may actually see a decrease of heat consumption (because the ash was not preheated in the tower and combustion gas volume will be lower with petcoke for same oxygen)
If kiln becomes much more dusty, the dust cycle will transport heat and will also contribute to higher consumption.

3. This depends on you current clinker chemistry. If sulphatisation ratio is very low (excess of alkalis), the SO3 will bind with alkalis and not with lime. This increases early strength without affecting the 28 days strength.