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.
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