Lime shaft kiln produces the core of good lime
Date：2019-07-22 15:23 Source：未知Views:
The main component of limestone is calcium carbonate, and the main component of lime is calcium oxide.The basic principle of firing lime is to use high temperature to decompose the calcium carbonate in limestone into calcium oxide and carbon dioxide.The technological process is as follows: loading limestone and fuel into lime shaft kiln (if the gas fuel is sent into the pipe and burner), preheating to 850℃, calcining to 1200 ℃, cooling, unloading out of shaft kiln.That is to complete the production of quicklime products.
Besides the lime kiln and good calcining process, the quality of limestone is the factor that affects the quality of lime.
The requirements of modern lime vertical kilns on limestone are basically the same as those of other kilns. The content of calcium oxide is more than 53%, and the sum of the harmful components such as silicon oxide, magnesium oxide, iron oxide and alumina is less than 2%.Particle size ratio of 1:2 is required.Particle size is 30-60;40-80;50-100 would be good.In short, the granularity is proportional to the calcining time.Those larger than 100 are not suitable for use in modern environmental protection and energy saving lime vertical kiln.Small grains of limestone crystals are not compact, organic matter combustion formed porous, carbon dioxide is easy to separate, easy to calcination.Limestone in less harmful components such as silica, magnesium oxide, alumina, iron oxide, sulfur and phosphorus.If one percent of these ingredients are found in limestone, 18 percent are found in calcined lime.
Therefore, we choose limestone with high content of calcium oxide, small particle size and less harmful impurities, so that the quality and yield of the fired lime can meet the standards and requirements.