198 posts
Re: Very Hard coating!!
The Molar Ratio can be calculated by the given below formula:
Molar Ratio=(SO3/80) / [K2O/94+0.5Na2O/62]-------Without Cl correction
Molar Ratio=(SO3/80) / [(K2O/94)+(Na2O/62)-(Cl/71)]
Ideal value of molar ratio should be 0.7 to 1.2
You may balance molar ratio by two way,first you may use low sulfur coal and second option by using alkali bearing material as a raw mix component.
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17 posts
Re: Very Hard coating!!
Thanks mr. Sahu for your answer ... you and Dr. Clark are helping very big cement company in solving its problem which couldnt be solved since 3 years so thank you very much to you... but i still have some more questions regarding to the formula of Molar ratio (with & without Cl),
1. What is the different between these two formula? what i mean is which one should we follow to calculate the ratio or in which case we should use each one (with or without Cl)?
2. Does the ideal value of molar ratio in both formula (with & without Cl) between 0.7 - 1.2 ??
3. Our fuel is natural gas so is there any way to reduce the sulphur from natural gas?
4. Can you give me examples of alkali bearing?
Best Regard
198 posts
Re: Very Hard coating!!
It will be better if you may analysed the Na2O,K2O,Cl and SO3 in hotmeal and convert the value in loss free basis and calculate the molar ratio.It is desirable to analayse the value by wet chemical method instead of by XRF, as most XRF are not calibrated well to know the actual value of Na2O,K2O,Cl and SO3 .The desired range of 0.7-1.2 value is with Cl correction.At the moment I don't know any desulpharization technology for natural gas is possible or not but certainly there is technology available for desulpharization of solid fuel but, it will reqiure additional investment cost.Addition of alakli bearing material will be cost effectiveFor alakali bearing material you may use "feldspar" after doing proper raw mix design.
17 posts
Re: Very Hard coating!!
Our plant has two kiln 2000 tpd (old) & 4000 tpd(new), both kiln system exactly the same, kiln feeding material and approx.everything is the same. We dont't have any coating problem in 2000 tpd kiln preheater as in 4000 tpd kiln preheater, also SO3/Alkali ratio in old kiln hotmeal is normal ( 0.8-1.0 ) while in the new kiln is very high ( >1.5). Why???
Thanks