What is the process of lime kiln production?
Lime kiln production is a process that involves the burning of limestone or other calcium carbonate materials to produce quicklime, also known as calcium oxide. The production process typically involves the following steps:
Quarrying and preparing raw materials
The limestone is quarried and transported to the production facility. The raw materials are then crushed and screened to the desired size.
Preheating the limestone
The raw limestone is preheated by burning fuel in a preheater or by using the waste heat from the kiln. This helps to reduce the energy required for the production process.
Calcining the limestone
The preheated limestone is fed into the kiln, which is heated to temperatures between 900 and 1200°C. The limestone is heated to the point of decomposition, which results in the release of carbon dioxide gas and the formation of calcium oxide.
Cooling and hydrating the quicklime
The quicklime produced in the kiln is cooled to a temperature of about 100°C using air or water. The quicklime is then hydrated by adding water to produce slaked lime, also known as calcium hydroxide.
Packing and shipping
The slaked lime is packed in bags or bulk containers and shipped to customers for use in a variety of applications, including construction, agriculture, and industrial processes.
The lime kiln production process requires careful control of the temperature, pressure, and other variables to ensure efficient and high-quality production of quicklime. The process is energy-intensive and requires significant amounts of fuel and electricity, but it is an important source of calcium oxide, which is used in a wide range of applications.