Lime Rotary Kiln

What is a Lime Rotary Kiln

A lime rotary kiln (also known as a rotary lime calciner) is an industrial calcination system used to convert limestone into quicklime through controlled heating, decomposition, and discharge. It is usually installed after crushing, screening, and preheating stages, then connected with cooler, dust collection, and finished lime handling equipment.

Typical kiln diameters range from 2.5-5.8 m, with lengths from 40-90 m and daily output from 50-1,200 t/d. Calcination quality depends on limestone size, CaCO3 content, residence time, flame temperature, fuel type, kiln slope, and draft control. The equipment is used in steel plants, sugar factories, magnesium smelting, calcium carbide plants, flue gas treatment, and construction lime production.

Key components: rotary kiln shell, supporting rollers, riding rings, girth gear, burner system, kiln hood, sealing device, refractory lining, hydraulic thrust system, preheater, vertical cooler, and dust collection system.

Lime Rotary Kiln Working Principle

A lime rotary kiln calcines limestone by moving material through a slightly inclined rotating cylinder while hot gas flows through the kiln. Beyond industrial lime processing, our engineering team also excels in designing heavy-duty Gold Mine Processing Plant Solutions for global miners. Compared with shaft kilns, a rotary kiln handles a broader limestone size range and gives better control over temperature profile, residence time, and fuel mixing.

• Raw stones processed by our high-efficiency Stone Crusher Plant Solution yield properly screened limestone, which enters the preheater at 10-40 mm
• hot kiln exhaust preheats stone to 750-850°C
• CaCO3 decomposes into CaO and CO2
• active lime discharges into the cooler at 80-120°C above ambient temperature.

Performance is affected by kiln speed, slope, fuel calorific value, limestone reactivity, and exhaust draft. A typical kiln slope is 3-4%, rotation speed is 0.5-2.5 rpm, and residence time usually stays between 2-4 hours depending on capacity and raw stone quality.

Lime Rotary Kiln Configurations

Lime rotary kiln systems are usually classified by process layout, fuel system, and production scale. Zhongyi supplies and configures rotary kiln lines for small lime plants, steel auxiliary lime stations, and continuous active lime production.

Preheater Rotary Kiln Line

Uses a vertical preheater before the kiln to recover exhaust heat and reduce fuel consumption. Capacity usually ranges from 150-1,200 t/d. Best for active lime plants requiring lower heat consumption.

Rotary Kiln with Vertical Cooler

Adds a cooler after kiln discharge to recover heat and reduce finished lime temperature. Typical discharge temperature is 80-120°C above ambient. Preferred for steel and chemical lime production.

Fuel-Flexible Lime Kiln System

Supports coal powder, natural gas, heavy oil, producer gas, or mixed fuel according to local cost and availability. Best for overseas projects where fuel infrastructure differs by region.

Specifications

Note: Specifications are for reference only. All models can be customized according to your specific requirements.

Applications

A lime rotary kiln is used where limestone must be calcined into quicklime with controlled activity, residual CO2, and particle stability. It fits both standalone lime plants and integrated steel, chemical, sugar, and magnesium production lines.

Steel Metallurgy

Produces active lime for converter steelmaking, sintering, and desulfurization, with typical quicklime activity controlled around 300-380 mL.

Sugar Refining

Supplies lime for juice clarification, where stable CaO content and low overburning help reduce process variation.

Magnesium Smelting

Calcines dolomite or limestone-based material for reduction processes, often requiring stable size distribution at 10-40 mm.

Calcium Carbide Production

Provides quicklime for carbide furnaces, where low moisture and controlled residual CO2 improve furnace stability.

Flue Gas Desulfurization

Produces lime used in dry or semi-dry desulfurization systems, with output matched to plant reagent demand.

Building Materials

Supplies lime for autoclaved brick, AAC block, dry mortar, soil stabilization, and road base treatment.

Chemical Processing

Produces lime for pH adjustment, water treatment, precipitated calcium compounds, and industrial neutralization.

While this stationary unit is ideal for large-scale, long-term processing plants, clients focusing on contractor work, concrete recycling, or quarrying with frequent site changes can explore our highly efficient mobile impact crusher for maximum on-site flexibility.

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How to Choose the Right Lime Rotary Kiln

Correct kiln selection affects lime activity, fuel cost, refractory life, emission control, and long-term operating stability. As a premier manufacturer, we offer a full engineering spectrum of premium Rotary Kiln and Dryer Equipment designed to withstand extreme thermal workloads.

For expert guidance and customized process recommendations, contact Zhongyi with your limestone analysis, capacity target, fuel plan, and project location.

Custom Lime Rotary Kiln 

To receive an accurate configuration and quotation,

Please Provide the Following Information:

Limestone or Dolomite Analysis

Feed Size Range (mm)

Target Quicklime Capacity (t/d)

Required Lime Activity or CaO Content

Fuel Type and Calorific Value

Local Power Supply (voltage / frequency)

Operating Hours per Day

Emission Control Requirement

Scope Required (kiln only or complete lime line)

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Lime Rotary Kiln Manufacturer & Supplier

Henan Zhongyi Environmental Protection Equipment Co., Ltd. specializes in lime calcination and mineral processing equipment. We supply rotary kiln systems for active lime, steel, sugar refining, and chemical industries. With proper configuration, our kiln lines can reduce fuel consumption by 20–35% compared to mismatched systems.

We design each solution based on limestone quality, particle size, capacity, fuel, and site conditions, covering kiln, preheater, cooler, burner, and dust collection.

We have 16+ years of experience, Zhongyi has delivered 380+ projects across Africa, Europe, North America, and the Middle East. We support the full process, including design, manufacturing, installation guidance, commissioning, training, and spare parts. ISO9001-certified, with CE options available on request.

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