LIME SLUDGE TREATMENT PROCESS

摘要

Disclosed is a method and apparatus for the heat treatment of lime sludge (CaCO3) to form burnt lime (CaO). In the method of the present invention, a lime sludge feed is entrained in and thereafter dried in a gas flash dryer means (4) to produce a dried lime sludge. The dried lime sludge is separated from the gas by a cyclone separator (3) and thereafter fed to a rotary kiln (10) in which the dried lime sludge is converted to active burnt lime. In order to maintain the flow of gas in the flash dryer means (4) at a predetermined velocity and in order to entrain all the lime sludge feed in the gas flow, an adjustable portion of the separated gases are recycled through the flash dryer means (4).