An object of the present invention is to provide a heavy metal removing apparatus which can efficiently remove the heavy metal contained in the dust produced by burning of the raw material containing the heavy metal, and a cement production system comprising the heavy metal removing apparatus. The control unit calculates a time interval between print jobs from the difference between a printing completion time of a first print job and a printing start time of a second print job based on the value which is measured by the timer when the print jobs are continuously performed. Furthermore, a CRC unit and a reception FIFO are arranged in the reception path of the module. The method additionally includes comparing the determined amount of time remaining for the clutch to stop slipping with the determined amount of time remaining until the clutch reaches the threshold temperature.