Calcimatic kiln

Large capacity, mixed feed, center burners Noncontact externally heated small capacity kilns used for niche applications Rotary hearth with traveling grate or calcimatic kilns... 

The Calcimatic is a patented kiln of Canadian origin that is radically different from other kiln types. It consists of a circular traveling hearth of variable speed, supported on two concentric tiers of rollers. Kiln feed of 12.7 mm is fed onto the hearth in a 2.5—10 cm bed from a preheater chamber. The kiln is usually fired with natural gas or fuel oil, although the option of using pulverized coal has also been developed. After great interest, resulting in sales of many units throughout the world, the popularity of the Calcimatic has ebbed because of disappointment in the unit s mediocre thermal efficiency. 

Calcimatic furnaces (rotary grate kilns) consist of a circulating grate on which the product to be burnt is fed as a thin layer through a stationary heating zone. Since the product is not moved during the calcining, very fine limestones can be burnt in these kilns. 

The rapid growth of the Basic Oxygen Steelmaking process in the 1960s required kilns which could produce a 6 to 40 mm quicklime, with a relatively high reactivity, low residual % CaCOs and low sulfur content. Initially, much of this new demand was met by Calcimatic and rotary kilns. 

---