What is the general lime burning rate
Lime burning rate, this seemingly simple technical indicator, actually contains many mysteries and process requirements in the lime production process. It is not only an important indicator for measuring the performance of lime production processes and equipment, but also one of the key factors for evaluating the quality of lime products. So, what is the typical lime burning rate?
Lime burning rate refers to the proportion of limestone heated at high temperatures (about 900 ℃ to 1100 ℃, also known as 900 ℃ to 1200 ℃) during the lime production process, which undergoes chemical reactions and is converted into active calcium oxide (CaO). Specifically, the formula for calculating the firing rate is: firing rate=amount of quicklime burned/amount of limestone burned x 100%. This indicator directly reflects the conversion efficiency of limestone at high temperatures and the purity of lime products.
Under normal circumstances, the firing rate of lime should reach a high level to ensure the quality and production efficiency of lime products. Generally speaking, high-quality limestone can achieve a firing rate of over 97% under suitable calcination conditions. This means that for every 100 tons of limestone, over 97 tons of high-quality quicklime can be burned. Of course, this value is not absolute and is influenced by various factors, including the chemical composition, physical properties, firing temperature, firing time, and furnace atmosphere of limestone.
The quality of limestone is one of the key factors affecting the firing rate. High quality limestone usually contains a high content of calcium carbonate (CaCO3), while the impurity content (such as silicon dioxide SiO2, aluminum oxide Al2O3, etc.) is low. During the calcination process, such limestone can be more fully converted into active calcium oxide, thereby improving the firing rate. On the contrary, if limestone contains a large amount of impurities, it will not only reduce the burning rate, but also affect the purity and quality of lime products.
In addition to the quality of limestone itself, the firing temperature and firing time are also important factors affecting the firing rate. Appropriate high temperature can promote the decomposition of calcium carbonate in limestone and increase the firing rate. However, excessively high temperatures may lead to excessive calcination of limestone, resulting in the phenomenon of "overburning", which in turn reduces the firing rate. Similarly, the length of firing time can also affect the firing rate. A longer firing time can improve the decomposition degree of limestone, but it can also increase energy consumption and process cycle. Therefore, it is necessary to reasonably control the firing temperature and firing time while ensuring product quality.
In addition, the atmosphere inside the furnace (especially the oxygen content) also has a significant impact on the firing rate. During the calcination process, sufficient oxygen can promote the decomposition reaction of calcium carbonate and increase the firing rate. However, excessive oxygen may lead to increased energy consumption and decreased product quality. Therefore, it is necessary to adjust the atmosphere inside the furnace and control the oxygen content to achieve the best calcination effect.
Lime burning rate is a complex and important technical indicator that is influenced by multiple factors. Under normal circumstances, high-quality limestone can achieve a firing rate of over 97% under appropriate calcination conditions. However, to achieve this goal, it is necessary to strictly control key factors such as raw material quality, firing temperature and time, and furnace atmosphere. Only in this way can we ensure the quality and production efficiency of lime products, and promote the sustainable development of the lime industry.
