The POLCAL® process was developed by Polysius based on its extensive experience in the field of thermal treatment of bulk materials acquired over many decades. It is especially suitable for treating fine-grained limestone and dolomite. Materials within a grain size range of 0.03 to 2 mm can be processed in this gas suspension process.
POLCAL® systems have several vertically arranged cyclone stages and a reactor for thermal treatment of the raw materials as well as one or several cooling cyclones to cool the treated product. The individual cyclone stages are interconnected by gas ducts.
By adapting the temperature and/or residence time in a conditioning drum or in a rotary kiln installed downstream the reaction chamber, the degree of reactivity of the burnt material can readily be adjusted to meet customer requirements.
With production capacities ranging between 300 and 1200 tpd of burnt product, liquid, gaseous and solid fuels can be used. The fuel is either fed to the reactor via several injectors or to the rotary kiln via the main burner.
A detailed description of the suspension calciner can be found in the following brochure: