Lime Rotary Kiln for sale

What is Lime Rotary Kiln?

Lime rotary kiln, also known as roller rotary kiln, is a large-scale calcining equipment, mainly used to decompose limestone (the main component is CaCO₃) into quicklime (CaO) and carbon dioxide (CO₂) at high temperature. To ensure that its air leakage coefficient is less than 10%, the lime rotary kiln adopts an advanced structure and a reliable combination of scaled seals at both ends. Its core function is to realize the continuous calcination of limestone, it also adopts composite refractory material to reduce heat radiation loss, widely used in building materials, metallurgy, chemical industry, environmental protection and other fields.

Working Principle: A Five-Step Breakdown of the Clinker Production Process

By means of the elevator speaks stored in the silo is transported to the top silo of the preheater during recycling. By means of a kiln rotating at an incline (inclination 3%-5%), the limestone raw material is evenly distributed to the different chambers of the preheater by means of feed pipes.

At the same time in the kiln through the preheating zone (200-800 ℃ dry preheating), calcination zone (900-1200 ℃ high temperature decomposition) and cooling zone (cooling down out of the material) of the three temperature zones; when the lime is pushed by the hydraulic actuator into the kiln, the heat generated by the combustion of the discharged fuel or electromagnetic induction heating is transferred to the material through radiation, conduction and convection, which prompts the decomposition of the limestone (CaCO₃) into quicklime (CaO ) and carbon dioxide (CO₂) which is then cooled to 100°C by cold air from the cooler. The continuous rotation of the kiln body ensures that the material is heated uniformly, ultimately realizing a continuous and efficient calcination process.

Lime Rotary Kiln Calcination Process – Precise, Efficient, Uniform

CHUNLEI lime rotary kiln adopts a proven high-temperature calcination process to continuously and uniformly convert limestone (CaCO₃) into high-activity quicklime (CaO). The entire process consists of four key stages:

1. Raw Material Preparation
   Limestone is crushed and screened to the optimal particle size (10-30mm), with fines and impurities removed to ensure proper permeability and heat exchange efficiency inside the kiln.
2. Preheating & Calcination
   The material enters the rotary kiln and is first preheated to approximately 900°C by the hot exhaust gases from the kiln tail. It then moves into the calcination zone (900-1200°C), where calcium carbonate undergoes a precise decomposition reaction:
   CaCO₃ → CaO + CO₂↑
   Precise temperature control prevents under-burning (incomplete decomposition) or over-burning (reduced reactivity), ensuring stable product reactivity above 300ml.
3. Rapid Cooling
   The finished lime enters a cooler and exchanges heat counter-currently with cold air, rapidly dropping the temperature to below 100°C before discharge. The preheated combustion air returns to the kiln, significantly reducing energy consumption (improving thermal efficiency by 15-20%).
4. Finished Product Output
   The discharged lime is transported via sealed conveyors to finished product silos, fully protected from moisture and carbonation, maintaining high reactivity to meet the demanding requirements of industries such as steel, chemical, and environmental protection.

Core Advantages:

• Uniform Calcination: The rotating kiln body tumbles the material, eliminating “hot spots” and achieving an under/over-burning rate of less than 5%.
• Fuel Flexibility: Supports various fuels including pulverized coal, natural gas, heavy oil, and biomass.
• Large-Scale Output: Single production line can achieve a daily capacity of 200-1,200 tons, ideal for continuous industrial production.
• Energy Efficient & Eco-Friendly: Waste heat recovery system plus enclosed dust collection design reduce energy consumption and dust emissions.

The Core Advantages of CHUNLEI Cement Rotary Kilns

• Lime rotary kiln controls the rotating speed through transmission device, DE machine and frequency conversion motor, which has advantages in energy saving and environmental protection, high efficient continuous production, stable product quality and so on:
• Lime rotary kiln adopts spring sealing, graphite block sealing and the combination of the above according to the characteristics and calcination requirements of lime to successfully solve the prevailing problems such as air leakage and make the conveying smoother.
• The lime rotary kiln, based on the thermodynamic calculation and analysis system, leaves a specific length of gap between the wheel belt and the kiln body to ensure that they fit closely under the working condition. This method effectively increases the rigidity of the kiln while preventing necking.
• The lime rotary kiln is heated evenly and has a low over-firing rate, which ensures the production quality.
• The lime rotary kiln is set with automatic temperature measuring device, advanced shaft structure and electric heating device.

Technical Parameters of Lime Rotary Kiln

Lime Rotary Kiln FAQ

Q: How much does a 300 tpd limestone rotary kiln cost?
A: Based on 2025 market prices, the complete equipment set (from preheater to cooler) typically costs between $210,000 and $420,000 USD. The exact price depends on the level of automation, environmental protection configurations, and whether installation is included. We offer a free customized quotation with a clear breakdown of all costs – no hidden fees.

Q: How much coal is needed to produce 1 ton of lime in a rotary kiln?
A: With a modern system including a vertical preheater and vertical cooler, the heat consumption to produce one ton of active lime is 1050-1200 kcal. This is equivalent to about 150-170 kg of standard coal per ton of lime. That saves about 15-20% in fuel costs compared to traditional old shaft kilns.

Q: My limestone is 10-40mm in size. Can I use a rotary kiln to calcine it?
A: Absolutely yes. Our rotary kiln system is specially designed with a low-pressure drop vertical preheater, which can directly utilize fine-grained limestone in the 10-50mm range. (Traditional shaft kilns usually require 30-80mm). This helps you reduce your raw material purchasing costs.

Q: How can I prevent ring formation (build-up) inside the rotary kiln?
A: Ring formation is mainly caused by high sulfur/chlorine content in the raw material or unstable operating temperatures. Our solutions include: ① An infrared temperature measurement and intelligent control system at the kiln hood to avoid local overheating; ② Anti-ringing refractory brick design; ③ Operator training. In daily operation, strictly controlling raw material quality and stabilizing the feed rate greatly reduces ring formation.

Q: Do you have overseas installation references? Can you send someone to guide the installation?
A: Yes. We have supplied complete production lines to clients in Russia, Kazakhstan, Indonesia, Nigeria, and other countries. We will dispatch 2-3 engineers to your site to guide the installation, perform commissioning, and train your workers – until the line produces qualified lime consistently.