Contents
10 Golden Rules for Clinker Burning
Rule 1
- Obtaining finer material on 90 and 200 µ residues decreases the burning heat and cement grinding specific energy.
- This also makes the strength higher.
- Decrease the residue amount from 20% to 10% on 100 µ mesh, gain 4 kWh/t energy.
By Producing Finer Meal
- Saving for:
–Burning fuel energy,
–Cement grinding energy
Is obtained…
Finer Meal = kW
Finer Meal = Energy Saving
Finer Meal = Saving on Grinding Energy
Rule 2 Short burning zone effects the grindability and strength development positively.
Hot and Short Burning Zone
- Makes the clinker easily grindable.
Short Burning Zone = Better Grindability (Grindability and Burning Zone Length)
Rule 3
- Stable conditions requires oxidizing environment.
- Reducing environment increases the volatile cycle.
- This causes the fluctuations of alkali sulphate and circulating elements.
- Thus, bad clinker is produced.
Let the Kiln Breathe
- With the reduction of volatile matter;
–Stable kiln operation,
–Stable clinker quality
Are achieved.
Rule 4
- Increase of clinker free lime content decreases the initial and final setting time.
- Limestone addition accelerates the initial and final setting time.
–Key Values;
- Increase of free lime from 0.5% to 1.5%, initial and final setting time decreases for 40-50 minutes.
Addition of small amount of free lime
- Makes the clinker Nervous
Decrease of Free Lime and Setting Time
Rule 5
- Increasing the C3S proportion of clinker develops the 1,2,3 and 7 day strength. After 28 days, strength development may be less because of C2S effect.
In short and middle term,
STRENGTH (C3S)
Rule 6
Hard to Grind…
Grindability
Rule 7 Whatever the formation is, alkalis do not affect the 28 days strength positively.
Effect of Alkalis
Rule 8 Regarding early strength, with the optimum sulphate content, soluble alkalis, especially alkali sulphates develops the early strength.
Rule 9 Change of crystal formation of C3A from cubic to orthorhombic,
–Bad burnability,
–Process problems,
–Sensitivity to aging
–Decrease in 28 days strength.
Alkalis more than sulphates
Rule 10 If the clinker SO3 amount is more the molar saturation rate, a significant increase is observed on clinker fineness and grindability.
