rotary lime kiln for sale

Rotary Lime Kiln

Kiln Body Length: 40 – 72 m

Production Capacity: 200 – 1,200 t/d

Calcination Temperature: 1100±50℃

Application: Active lime production, quick lime production.

AGICO Rotary Lime Kiln

AGICO Rotary Lime Kilns are specifically designed for efficient, energy-saving, and environmentally friendly lime production. Our rotary lime kilns adopt internationally advanced technology and are equipped with vertical preheaters and vertical coolers, providing lime production enterprises with complete turnkey solutions. Tailored to the unique production needs of each customer, personalized customization solutions are provided.

Lime, produced through the high-temperature calcination of limestone, is a common but essential material in today’s world. It finds widespread use in various fields in modern society, including construction, building materials, metallurgy, chemical industry, environmental protection, pharmaceuticals, and more.

Currently, there are two mature lime production processes: shaft kiln calcination and rotary kiln calcination, each with its own advantages and disadvantages. Among them, the rotary kiln process is more suitable for high-yield and large-scale lime production. After years of technological accumulation and product innovation, AGICO’s rotary lime kilns demonstrate excellent performance in calcination efficiency, heat loss reduction, and controlling over-burning rate.

vertical preheater in rotary lime kiln

AGICO Rotary Lime Kiln Features

Convenient and efficient automation control

AGICO rotary lime kiln adopts advanced PLC and computer control systems, achieving rational, scientific, and intuitive process control. Our automation control system not only facilitates human-machine interaction but also features unmanned operation, providing more efficient management and operation for production.

Convenient installation and maintenance

To meet customer needs, AGICO rotary lime kiln is designed with auxiliary transmission devices, allowing the cylinder to rotate at low speeds. This greatly simplifies the installation and maintenance process, providing customers with convenience and efficiency.

Reliable sealing performance

AGICO lime rotary kiln is designed with careful consideration of sealing performance. Reliable sealing devices are installed at the feeding end (kiln tail) and the discharging end (kiln head) to effectively prevent cold air from entering and smoke and dust from overflowing the cylinder. This not only improves thermal efficiency but also ensures a clean and safe production environment.

Excellent environmental performance

AGICO rotary lime kiln is equipped with advanced dust removal technology and exhaust gas treatment devices, dedicated to reducing the emission of smoke and waste gas, achieving more environmentally friendly lime production. Our products not only meet production needs but also shoulder environmental responsibilities, contributing to sustainable development.

Rotary Lime Kiln Structure Design

The cylinder of the lime rotary kiln is made of rolled steel plates and lined with refractory materials. It is inclined at a specified angle to the horizontal line and supported by multiple sets of riding rings on various supporting devices. Near the feeding end of the rotary kiln, a large girth gear is fixed on the cross-section of the cylinder with tangential spring plates, and below it, there is a small gear that meshes with it.

During normal operation, the main drive motor transmits power to the open gear device through the main reducer, driving the rotary kiln. Materials enter the kiln for calcination from the kiln tail (the high end of the cylinder). Due to the inclination of the cylinder and the slow rotation, the materials roll along the circumference and move axially (from the high end to the low end), continuing their process, and finally, the finished product enters the cooler through the kiln head hood for cooling. Fuel is injected into the kiln from the kiln head, and after exchanging heat with the materials, the waste gas is discharged from the kiln tail.

Rotary Kiln Lime Production Process

The limestone raw material is screened and fed into the top bin of the preheater by a belt feeder, and then enters the preheating chamber through the discharge pipe inside the bin. In the preheater, limestone exchanges heat with high-temperature flue gas, absorbing the heat of the flue gas, raising its temperature, while the temperature of the flue gas decreases as it enters the dust collector. After absorbing sufficient residual heat, limestone enters the rotary kiln through the tail chute and passes slowly and orderly through the preheating zone, calcining zone, and cooling zone inside the kiln. The highest temperature inside the kiln during calcination can reach 1350°C. The entire process is completed in three separate units: the preheater, the rotary kiln, and the cooler. Secondary air blown into the kiln from the bottom of the cooler participates in combustion after exchanging heat with lime. The cooled lime is discharged through an electric vibrating feeder, then uniformly conveyed to the top of the material bin through a chain conveyor, and finally sent to the top of the material bin by a bucket elevator. The top of the material bin is equipped with screening equipment, where particles smaller than 8mm are collected as powder and enter the material bin, while the rest enter the block bin.

Product Specifications

Production capacity(t/d)20025030035040050060080010001200
Kiln size (m)φ2.8×43φ3.0×48φ3.2×50φ3.3×52φ3.6×55φ3.8×58φ4.0×60φ4.3×65φ4.9×70φ5.1×72
Calcination temperature (℃)1100±50
Energy consumption (kCal/kg)1200±100
Electricity consumption(kW·h/t)40±5
limestone : lime1.7~1.78:1
Lime overfiring rate≤5%
Product lime activity (ml)360 ~ 400
Discharged lime temperature (℃)Ambient temperature +65
limestone size (mm)20 ~ 40
CO concentration in flue gas≤1.5%
Applicable fuelsCoal, diesel, natural gas, liquefied petroleum gas, etc.

Rotary Kiln Lime Calcination Principle

When using the rotary kiln process to produce lime, the conversion of limestone into lime requires three processes: preheating, calcination, and cooling.

Preheating

Calcination

Cooling

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