Aiming at the pulverization problem in metallurgical lime production,three kinds of limestone raw materials calcination pulverization rate experiments were carried out.The results showed that appropriate calcination temperature could effectively control the lime pulverization rate and improve the lime yield.From the samples taken in the experiment,at 950 ℃ the decomposition rate of limestone was the highest,the pulverization rate was the lowest and the calcination effect was the best.The lime pulverization rate was related to the grain size of limestone.Limestone with coarse grains was easy to be broken and powdered during calcination at high temperature，that was because of its tight intergranular bonding and less ability to absorb thermal expansion.