The Rotary kiln used for the burning lime is similar to that used for cement manufacturing but is much smaller in size and is worked at a lower temperature. It consists of an inclined steel cylinder 1.5 to 2.5m in diameter and 15m to 45m long, lined with refractory bricks. Limestone crushed to much smaller pieces is charged at the upper end. Kiln is fired with coal, oil or producer gas and daily out turn is nearly 70 to 80 tonnes if lime. Due to better control on the operation product obtained is of superior quality. Rotary kilns are widely used in highly industrialized countries and for making lime for chemical industries.
1. The quantity of fuel to be used should be carefully worked out.
2. Before burning the limestone they should be broken into suitable sizes.
3. Quick heating of limestone may blow the limestone due to quick release of moisture and carbon dioxide so the burning should be gradual.
5. Over burning and under burning of the lime should be avoided as the over burnt or under burnt lime does not slake and is known as the dead lime.
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