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The rotary hearth calciner (Figure 6.1.2.9) was originally developed by the Wise Coal and Coke Company. Green coke charged at the periphery of the hearth travels around the calciner (b) in a series of concentric paths. At the completion of each revolution, the coke is moved by a rabble arm set in the roof into the next concentric path. This process is repeated, until at the final rabble, the coke is discharged into the soaking pit. From the soaking pit the coke can be discharged into a rotary cooler (c). During normal operation the retention time for the coke in the hearth and soaking pit is approximately two hours [26].

The advantage of rotary hearth is low demand for area.