Lime Kiln

What is Lime Kiln?

Limestone is a natural rock with the main component of calcium carbonate whose Mohs hardness is 3. It can be directly processed into stone materials and used for industrial products such as in building materials, highways, metallurgy, chemical industry and so on. Besides, lime can be fired into quicklime, and used in the industries of water quality treatment, asphalt improvement, desulfurization, building materials, medicine and the like.

Lime kiln is also named as limestone rotary kiln and active lime kiln, which is the main equipment for calcining active lime into carbon dioxide and calcium oxide, the latter of which is what we call quick lime. With advantages such as reasonable structure, good sealing property, less thermal radiation loss, and high level of automation, FTM has models of customized lime kiln for sale.

Working Principle of Lime Kiln

Structure of Lime Kiln

The main structure of limestone rotary kiln includes the supporting device, kiln head, kiln tail sealing device, rotary cylinder, coal burner and so on. The kiln body is located on the roller and has a horizontal inclination of about 3 °. The supporting wheel device is used to support the whole kiln body, and the retaining wheel device is used to control the movement of the kiln body up and down.

Lime Kiln Working Process

When lime kiln works, crushed lime in the material bin is screened and lifted to the upper bin of the pre-heating device. Then it is scattered in each room of the pre-heating device and gets heat exchange with smoke. Herein the lime is 30% decomposition. Fully preheated lime gets into the calcination through the tail chute. Lime goes slowly through the pre-heating zone, calcination zone and cooler, in which process, it is calcinated into CaO and CO₂. Finished lime is cooled below 100℃ and exhausted out to the store by bucket elevator and belt conveyor.

Structural Advantages of Limestone Kiln

• Overtemperature alarm device and automatic temperature control device are adopted to ensure the safe and stable operation of the lime kiln. 
• The transmission part of limestone rotary kiln is equipped with an auxiliary device to prevent the deformation of the kiln body, which ensures that the kiln body can still rotate slowly when the main transmission power supply is interrupted. 
• The kiln head is equipped with shell-sealing device, and the kiln tail is equipped with axial contact sealing device, which not only prevents the loss of limestone materials, but also avoids the discharge of dust from the lime kiln. This arrangement reduces dust pollution and improves the working environment of limestone calcination.
• This equipment adopts a vertical preheater with minimal pressure loss, the decomposition rate of the limestone entering the kiln after being preheated can reach 20-25%, and the waste heat effect and the decomposition rate of the limestone are effectively improved. 
• Through the introduction of the design concept of the German rotary kiln, the traditional cylinder structure is optimized and improved, which not only improves the service life of the cylinder, but also improves the burning temperature of the limestone rotary kiln, so that the burning effect of the limestone is better and the efficiency is higher.

Classic Case of FTM Lime Kiln

In Philippine, FTM rotary kiln is used in the limestone line with a production capacity of 100TPH.

As one of the powerful limestone kiln manufacturers in China, Fote Machinery has a number of the high-quality lime kilns for sale. Skilled FTM engineers are here to offer you professional and free consultation including solution on kiln selection, lime kiln price, and the flow chart, etc.

General Specification