Henan Hongke Heavy Machinery Co., Ltd. is pleased to report on the successful deployment of a Φ3.0×60m rotary kiln for lime production at a customer site in Inner Mongolia, China. The system is designed for a capacity of 100 tons per day and represents a robust, efficient solution for medium-scale lime calcination in challenging northern climates.
Project Background: Meeting Industrial Demand in Inner Mongolia
Inner Mongolia has emerged as a significant industrial hub in northern China, with growing metallurgical, calcium carbide, and building materials sectors. These industries all depend on a reliable supply of high-quality active lime for fluxing, chemical reactions, and construction applications.
Our customer, a well-established industrial operator in the region, identified the need to expand their lime production capacity to serve local demand. However, Inner Mongolia's harsh climate—with extreme temperature variations and cold winters—presented unique challenges for equipment selection and system design. The customer required a kiln system that could deliver consistent product quality year-round while maintaining operational efficiency and meeting environmental standards.
The Challenge: Climate and Quality Demands
Before choosing Henan Hongke Machinery, the customer faced several key challenges:
Extreme operating conditions – Winter temperatures in Inner Mongolia can drop well below freezing, requiring robust thermal management
Consistent product quality – Local metallurgical customers demanded lime with stable reactivity and low residual CO₂
Fuel efficiency – Operating costs needed to be controlled despite variable fuel availability
Environmental compliance – Dust emissions had to meet increasingly strict national standards
Reliable operation – The system had to run continuously with minimal weather-related interruptions
Our Solution: Φ3.0×60m Rotary Kiln System
Henan Hongke Heavy Machinery engineered a complete lime production system centered around a Φ3.0×60m rotary kiln – a configuration well-suited for 100 TPD applications in northern climates. The longer kiln length (60 meters) provides extended residence time, ensuring complete calcination even with the variable feed characteristics common in the region.
Key Equipment Specifications
| Parameter | Value |
|---|---|
| Kiln diameter | 3.0 meters |
| Kiln length | 60 meters |
| Capacity (design) | 100 tons per day |
| Operating temperature | 950–1,250°C |
| Kiln inclination | 3.5–4% |
| Rotation speed | Adjustable (variable frequency drive) |
| Drive system | Heavy-duty gear drive with auxiliary motor |
Complete System Configuration
The delivered system includes the following integrated components, all engineered and manufactured by Henan Hongke Machinery:
1. Vertical Preheater
The preheater recovers thermal energy from kiln exhaust gases to preheat limestone feed to approximately 800–900°C before it enters the kiln, achieving 25–35% pre-calcination. This reduces fuel consumption by up to 30% compared to non-preheater configurations. The preheater is specifically insulated for cold-weather operation, maintaining thermal efficiency even during Inner Mongolia's harsh winters.
2. Φ3.0×60m Rotary Kiln
The core calcination unit features a high-quality carbon steel shell with high-alumina refractory lining designed for the demanding thermal cycling of cold-weather startup and shutdown. The 60-meter length provides extended residence time—critical for achieving complete calcination and maintaining product quality under variable feed conditions. The slightly inclined, slowly rotating cylinder ensures uniform heat distribution at temperatures between 1,100°C and 1,250°C, producing lime with activity levels of ≥320–340ml.
3. Vertical Cooler
The cooler rapidly quenches hot lime product from approximately 1,100°C to below 100°C, preserving the lime's reactivity. Rapid cooling is essential for maintaining the high reactivity required for metallurgical applications. The hot cooling air is recovered and recycled to the kiln as secondary combustion air, further improving thermal efficiency.
4. Advanced Sealing System
Cold-weather operation places special demands on kiln seals. The system incorporates labyrinth seals with air purge at both kiln head and tail, minimizing heat loss and preventing cold air ingress that could reduce thermal efficiency.
5. Dust Collection System
A multi-stage dust collection system—cyclone pre-separator followed by bag filter—ensures outlet dust concentrations consistently below 30–50 mg/Nm³, meeting national environmental standards.
6. Automation & Control
PLC-based centralized control monitors temperature profiles, feed rates, kiln rotation speed, and emissions in real time. The system includes cold-weather startup protocols to protect refractory and mechanical components during winter commissioning.
Why This Kiln Works for Inner Mongolia Conditions
| Feature | Advantage |
|---|---|
| 60m length | Extended residence time compensates for cold-weather feed variability |
| Insulated preheater | Maintains thermal efficiency in sub-zero temperatures |
| Advanced seals | Prevents cold air ingress; maintains kiln heat profile |
| Rapid cooler | Preserves lime reactivity for high-value applications |
| Automated controls | Consistent quality; reduced operator exposure to harsh conditions |
Customer Benefits
Once fully operational, this 100 TPD lime production line will deliver:
Consistent high-quality product – Active lime meeting metallurgical specifications with activity ≥ 320ml
Energy-efficient operation – Preheater technology reduces fuel consumption by approximately 30%
Year-round reliability – Cold-weather design ensures stable operation across all seasons
Environmental compliance – Dust emissions controlled to meet national standards
Enhanced competitiveness – Local production reduces dependency on imported lime
About Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd. (Henan Hongke Machinery) has been manufacturing industrial processing equipment since 2006. Our product portfolio includes:
Rotary Kilns – for lime, cement, metallurgy, and mineral calcination
Rotary Dryers – for sludge, biomass, and industrial materials
Ball Mills – for ore, slag, cement, and chemical grinding
Crushers – for primary and secondary size reduction
We provide custom engineering, full manufacturing, installation guidance, and after-sales support for customers worldwide.
Summary
The Φ3.0×60m lime rotary kiln project in Inner Mongolia demonstrates Henan Hongke Machinery's ability to deliver efficient, reliable lime production solutions adapted to challenging northern climates. By integrating preheater technology, advanced sealing, extended kiln length, and automated controls, the system will deliver consistent product quality with optimized fuel consumption—regardless of the weather outside.
For lime calcination, mineral processing, or other thermal treatment applications, contact Henan Hongke Heavy Machinery Co., Ltd.
Henan Hongke Heavy Machinery Co., Ltd.
Rotary Kilns | Rotary Dryers | Ball Mills | Crushers – Engineered for Real-World Results