Discussion
The sulphate to alkali ratio in a kiln is monitored because
Answer: B
Correct answer: an imbalance promotes build-ups and affects setting
Sulphur in excess of the alkalis available to combine with it recirculates in the kiln and condenses as sticky build-ups in the preheater, which eventually block it. Alkali in excess of the sulphur leaves free alkali in the cement, which accelerates setting and contributes to alkali-silica reaction. The ratio is held near unity for both reasons.
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