How to calculate the calcination rate of lime in a lime kiln
Lime firing rate is a key technical indicator for measuring the quality of kiln calcination, directly reflecting the degree of complete decomposition of limestone. This value needs to be obtained through standardized sampling and measurement methods, and the calculation results should be objective and comparable.
The determination of the burning rate is based on the residual amount of undecomposed calcium carbonate (CaCO). The specific operation process is as follows: Select representative samples from the finished lime products from the kiln according to the prescribed method. After carefully crushing it, select the clearly undecomposed limestone cores, which are usually different in color from the surrounding area and have a harder texture. Subsequently, weigh the picked raw burnt portion separately from the complete sample. The formula for calculating the burning rate is: burning rate (%)=(weight of raw materials/total weight of samples) × 100%.
This process requires representative sampling and uniform selection criteria to reduce human error. More precise laboratory methods can be supplemented by chemical analysis, which can be validated by measuring the residual carbon dioxide or acid insoluble content in the sample. The lower the firing rate, the more stable the thermal system inside the kiln, the more uniform the heat distribution, and the more complete the calcination.
The core factors affecting the firing rate include calcination temperature, residence time, uniformity of limestone block size, and gas-solid heat transfer efficiency. Modern lime kilns can stabilize the firing rate at a lower level by precisely controlling these parameters. Continuous monitoring of the firing rate is an important basis for optimizing kiln operations, improving product consistency, and enhancing economic benefits.
