In a top-shaped lime kiln which comprises a slowly rotatable platter-shaped kiln bed having a cylindrical calcined lime-cooling chamber extending downward for connection to the central opening of said kiln bed; an immovably hung round lid having a fuel combustion chamber extending upward for connection to the central opening of said lid; and raw limestone granules-feeding chutes 19 opened to an annular gap 12 formed between the peripheral walls of both bed and lid; an improvement wherein a hot-gas-circulating apparatus is fixed in the maturation zone of the cooling chamber, and automatically reciprocative pushing rods are inserted into the limestone granule layer formed on the rotary kiln bed through the peripheral wall of said bed or lid so as to let fall the calcined lime into the cooling chamber.
