What size of limestone can be burned in a blast furnace lime kiln
In the limestone processing industry, the blast furnace lime kiln vertical kiln as a common calcining equipment, has strict requirements for the size of the raw limestone. The size of the limestone not only directly affects the quality of the burnt lime, but also deeply affects the capacity and energy consumption of the vertical kiln. Therefore, it is of great significance to deeply discuss the issue of grain size selection for burnt limestone in blast furnace lime kiln vertical kiln for optimizing lime production.
What we need to clarify is that the size of limestone directly determines the quality of lime burning. If the limestone particles are too large, it is difficult to fully decompose during the burning process, which will result in low activity and poor quality of the generated lime. On the other hand, if the limestone particles are too small, although the heat transfer efficiency is high during the burning process, the small particles are prone to overburning during the burning process, which will also make the lime lose its activity. Therefore, choosing the appropriate size of limestone particles is the key to ensuring the quality of lime.
In blast furnace lime kilns, it is usually recommended to use limestone with a grain size of 40-80mm for burning. This grain size range of limestone can balance heat transfer and burning quality during the calcination process. In addition, the appropriate grain size can also help improve the kiln's output and reduce energy consumption. Large limestone particles will increase the thickness of the material layer in the kiln, resulting in a lower heat transfer efficiency, a longer burning time, and a decrease in output. On the other hand, smaller particles can improve heat transfer efficiency, but a thin material layer will also limit output. Therefore, the 40-80mm grain size range can optimize output and energy consumption while ensuring quality.
In practice, the screening of raw materials is an important step to ensure a uniform particle size of limestone before it is fed into the kiln. By using screening equipment to remove excessively large or small particles, we can ensure that the particle size of the limestone fed into the kiln falls within the specified range. The selection of screening equipment should be based on the particle size distribution and production requirements of the raw materials to ensure efficient and precise screening.
Besides grain size selection, the calcining process of the blast furnace lime kiln vertical kiln is also influenced by multiple factors such as raw material properties, equipment performance, and market demand. The chemical composition, physical properties, and particle size distribution of the raw materials affect the choice of the optimal calcining grain size. The height, diameter, and thermal regime of the equipment also affect the calcining of limestone in the kiln. Meanwhile, different uses of lime require different particle size ranges, so the optimal grain size range needs to be determined based on market demand.
While optimizing the grain size selection, the vertical kiln for blending burnt lime should also pay attention to improving the automation level and intelligence level of the calcining process. By introducing advanced control systems and detection technologies, the precise control of calcining temperature, time, and air volume can be achieved, further improving the calcining quality and production efficiency of lime.
In summary, the selection of limestone particle size for co-firing lime kiln rotary kiln is a problem that requires comprehensive consideration of multiple factors. Only by fully understanding the characteristics of raw materials, equipment performance, and market demand, combining practical operational experience and optimization measures, can the most suitable particle size range be selected to achieve the efficient and stable operation of the lime kiln rotary kiln and sustainable development.
