Limestone calcination particle size requirements and kiln adaptation
In the process of producing active lime through limestone calcination, the compatibility between limestone particle size and kiln type is crucial, which directly affects the calcination effect, product quality, and production efficiency.
Different kilns have different requirements for the particle size of limestone. Vertical kilns are usually suitable for processing limestone with particle sizes ranging from 40-80mm. Limestone within this particle size range can form a relatively stable material layer in a vertical kiln. When gas passes through the material layer, the resistance distribution is uniform, which is conducive to heat transfer and calcination reaction, ensuring that limestone is fully calcined and producing lime with high activity.
The adaptability of rotary kilns to limestone particle size is relatively wide, and generally a particle size of 10-50mm is more suitable. Smaller particle size can increase the contact area between limestone and hot gases, accelerate heat transfer and reaction rate, and improve production efficiency. However, particles that are too small can easily lead to an increase in dust, which increases the difficulty and cost of exhaust gas treatment.
If the particle size of limestone does not match the kiln, it will bring many problems. If the particle size is too large and the calcination in the kiln is not sufficient, it is easy to produce undercooked lime; If the particle size is too small, collapse may occur in the vertical kiln, affecting the continuity and stability of production.
Therefore, in actual production, it is necessary to strictly control the particle size of limestone according to the selected kiln type, in order to achieve efficient and high-quality calcination production.
