Henan Hongke Heavy Machinery Co., Ltd. is pleased to report on the successful commissioning of a brand-new Φ2.5×60m calcium fluoride (fluorite) rotary kiln at a customer site in Haining, Zhejiang Province, China. This is a completely new production line—not a refurbishment, not an upgrade of old equipment—designed from the ground up for high-purity fluorite processing.
Project Background: Meeting the Demand for High-Quality Calcium Fluoride
Calcium fluoride (CaF₂), commonly known as fluorspar, is a critical raw material for the metallurgical, chemical, and optical industries. It is widely used as a flux in steelmaking, in the production of hydrofluoric acid, and in specialty glass and ceramics manufacturing . To obtain high-quality synthetic fluorspar, calcium fluoride slurry must be calcined in a rotary kiln at temperatures of approximately 900–1100K (627–827°C) . The calcination process significantly influences grain size and compression strength of the final product.
Haining, located in the Yangtze River Delta region, has emerged as a hub for advanced materials manufacturing. Our customer, a chemical materials producer, identified the need to expand their calcium fluoride processing capacity to serve growing demand from steel mills and chemical plants across eastern China.
The Challenge: New Facility, New Equipment
Before choosing Henan Hongke Machinery, the customer was operating a smaller, outdated production line that could no longer meet their quality or output targets. They required:
Brand-new equipment – no second-hand machines, no retrofits
Consistent product quality – stable grain size and compression strength
High throughput – to meet growing market demand
Energy efficiency – lower operating costs
Environmental compliance – strict dust emission standards
The customer made it clear from the start: they wanted a purpose-built, modern rotary kiln system designed specifically for calcium fluoride calcination—not a repurposed cement or lime kiln.
Our Solution: Φ2.5×60m Rotary Kiln System
Henan Hongke Heavy Machinery engineered and manufactured a complete, brand-new calcination line centered around a Φ2.5×60m rotary kiln—a configuration well-suited for calcium fluoride processing at medium-to-large capacity.
Key Equipment Specifications
| Parameter | Value |
|---|---|
| Kiln diameter | 2.5 meters |
| Kiln length | 60 meters |
| Processing capacity | Custom-engineered to customer requirements |
| Operating temperature | 627–827°C (900–1100K) |
| Kiln inclination | 3.5–4% |
| Rotation speed | Variable frequency drive |
| Drive system | Heavy-duty gear drive with auxiliary motor |
| Sealing system | Labyrinth seals with air purge at both ends |
Complete System Configuration
1. Feed System
The system includes a variable-speed screw feeder designed to handle calcium fluoride slurry or powder with consistent feed rates—critical for maintaining uniform calcination conditions.
2. Φ2.5×60m Rotary Kiln
The core calcination unit features a high-quality carbon steel shell with high-alumina refractory lining. The 60-meter length provides sufficient residence time for complete thermal treatment at 900–1100K, ensuring optimal grain size and compression strength . The temperature profile is precisely controlled across heating zones to accommodate the specific requirements of calcium fluoride calcination.
3. Burner System
The multi-fuel burner can operate on natural gas or pulverized coal, adapting to local fuel availability while maintaining stable temperature control.
4. Dust Collection System
A multi-stage dust collection system—cyclone pre-separator followed by bag filter—captures fine particles and ensures emissions meet environmental standards.
5. Automation & Control
PLC-based centralized control monitors temperature profiles, feed rates, kiln rotation speed, and emissions in real time. Full data logging supports quality documentation and process optimization.
Key Advantages: Brand-New, Purpose-Built
| Feature | Benefit |
|---|---|
| New design | Built to modern standards—no hidden wear, full service life ahead |
| Precise temperature control | Consistent product quality, optimized grain size |
| Continuous operation | 24/7 production, no batch-to-batch variability |
| Advanced seals | Minimal heat loss, lower fuel consumption |
| Automated controls | Reduced labor requirements, consistent output |
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 calcium fluoride, lime, dolomite, 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 Φ2.5×60m calcium fluoride rotary kiln project in Haining, Zhejiang, demonstrates Henan Hongke Machinery's ability to deliver brand-new, purpose-built calcination solutions for the chemical and metallurgical industries. By integrating precise temperature control, continuous operation, and automated monitoring, the system produces consistent, high-quality calcium fluoride product with optimized process efficiency.
For calcium fluoride processing, mineral calcination, 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 – Built New, Built Right