Raj Sahu
198 posts
TimePosted 10/12/2013 11:51:01
Raj Sahu says

re Troubles in using 100% petcoke

I would like to add to the response of Mr. Ted that traditionally it has been stated that an excess SO3 content of some 300-700 gm per 100 kg clinker can be tolerated in the kiln system.Lower limit will be valid for hard to burn raw materials while the upper one referes to easy burnable raw meals.Apart from adjustment of the sulphur/alkali ratio it is possible by operational means to reduce substantially the sulphur evaporation in the burning zone,thus extending the traditional limit well beyond 1000 kg SO3 per 100 kg clinker,such measures are:

1.High Oxygen - levels in the kiln ( around 5% O2)

2. High Flame Momentum

3.Short residence time in the burning zone

4.Improve chemical burnability

5.Finer grinding of raw mix and petcoke

6. Use of Flourite(CaF2) as mineralizer

7.Optimized kiln operation


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11 posts
TimePosted 14/01/2014 10:09:58
Harald says

re Troubles in using 100% petcoke

Dear Sidhant

Basically your are on the right way.

Additionally you could install:

meal curtain

Post combustion chamber to increase rentention time by approx 1.5 sec

Both would help you for your problems

If you are interested kindly let me know.



Cement Tech
1 posts
TimePosted 27/12/2014 08:51:46

High Clinker Burnability

Dear Expert,

We are producing white clinker with high sulphur petcoke. we get kiln feed burnability around 8%. it is too much high. how to reduce it to 4%. we use 0.40% calcium Fluoride in raw meal. our clinker analysis as follows.

C3S : 60, C2S : 20, C3A : 12 and C4AF : 0.80%, SO3 : 2.20, K2O : 0.35, Na2O : 0.14, Cl : 0.01%,

our petcoke sulphur is 6.00%. out petcoke consumption is 13%. please suggest me how to reduce the burnability.


Ted Krapkat
537 posts
TimePosted 29/12/2014 02:48:15

re High Clinker Burnability

One option is to add a percentage of feldspar to your raw mix to balance the alkali sulphur ratio and act as a fluxing agent. (Potassium feldspar contains ~16% K2O)

Feldspar is often used these days in white cement clinker production to improve the burnability of the raw mix and to balance high SO3 content in the raw materials or fuels.

Feldspar acts as a fluxing agent by reducing the liquid phase formation temperature and by increasing the amount of clinker liquid phase, which is exceptionally low in white cement clinker due to the lack of iron in the raw mix.

By using feldspar to balance the molar SO3/(K2O + Na2O) ratio, additional alkali sulphate liquid phase becomes available for clinkerisation, reducing sulphur recirculation in the kiln and improving clinker nodulisation and overall burnability of the mix.

Hope this helps...