The rate of decomposition of calcium carbonate and calcination temperature, as in a rotary kiln calcination temperature completely decomposable shortened, but tend to be completely decomposed time constant. When the heat transfer coefficient a> 100kj / (m2 * h * C), the strengthening of the external heat transfer coefficient is hardly aggregate, can be said that decomposition time constant, so the decomposition temperature of calcium salt will generally heated to 1300 degrees Celsius. High carbonate is decomposed in depth towards the internal speed 1200 degrees Celsius, the limestone decomposition rate substantially at depth 25 - 30mm / h between. Therefore, to control the particle size of raw limestone in a certain range, the grain ratio of the maximum and minimum in a certain range, the required proportion of grain outside the limestone less than 10%. When using the vertical kiln calcination of limestone, the limestone grain size than is generally between 2-2.5. When using the rotary kiln, lime is proportional grain size ratio of 3 (bulk material in the rotary kiln walk the line speed) to avoid raw or burnt burning phenomenon, while controlling the grain size can also improve the thermal effect. Lime kiln with low loss vertical preheater can effectively improve the preheating effect of preheated limestone kiln decomposition rate of up to 20-25%, and the direct use of 10-15mm fine grade limestone. He has a reliable rotary seal both ends of modular scales, you can make use of air leakage coefficient is less than 10% of the refractory compound to reduce radiant heat loss. Lime kiln filled, can be partitioned ventilated round or square vertical cooler, resorted to the cooler temperature of 800C + lime ambient temperature, easy to transport, storage, and secondary air into the kiln will be heated to 7000C or more, reducing the moving parts and special materials. Please indicate Henan YuFeng Heavy Machinery (http://www.yufchina.com)