Magnesite is a carbonate mineral of magnesium and serves as the primary raw material for producing basic magnesia refractories and extracting metallic magnesium . The magnesite rotary kiln is the core equipment used to calcine magnesite at high temperatures, producing finished products such as light-burned magnesia, sintered magnesia, and fused magnesia .
Henan Hongke Machinery manufactures a comprehensive range of magnesite rotary kilns with cylinder diameters ranging from Ø1.6m to Ø6.0m and lengths up to 95m, accommodating production capacities from 2 tons per hour to over 10,000 tons per day . Our kilns are engineered for the rigorous demands of the Pidgeon process in magnesium ingot production lines as well as refractory material manufacturing .
Equipment Structure
The magnesite rotary kiln is composed of several key components working in harmony to ensure stable and efficient calcination:
For kilns with a cylinder diameter of 2.2m or larger, auxiliary transmission systems are standard; units above 3.0m in diameter are equipped with four supporting stations instead of three for enhanced stability .
Working Principle
The magnesite rotary kiln operates on a straightforward yet highly effective thermal processing principle:
Material Feed: Raw magnesite is fed into the kiln through the feed chute at the kiln tail (the elevated end) .
Material Movement: Due to the kiln's inclination (typically 3.5-4.0%) and slow rotation (0.4-2.85 r/min), the magnesite rolls along the circumference while moving axially from the kiln tail toward the kiln head .
Heat Application: Fuel (natural gas, coal powder, diesel, or heavy fuel oil) is injected through the burner at the kiln head and combusted. Heat is transferred to the material through radiation, convection, and conduction .
Calcination Process: As the material travels through the kiln, it undergoes sequential thermal stages:
Preheating zone: 100-200°C – moisture removal
Preheating zone: 200-800°C – initial decomposition
Burning zone: 800-1450°C – complete calcination and sintering
Cooling zone: 100-800°C – gradual cooling before discharge
Discharge: The calcined magnesite (calcined white) is discharged from the kiln head device and sent to the cooling system .
Key Advantages
Henan Hongke Machinery magnesite rotary kilns offer numerous performance benefits that set them apart:
✅ Superior Product Quality & High Output
Our kilns produce uniformly calcined magnesite with consistent quality, ensuring your downstream processes achieve optimal results .
✅ Stable & Reliable Operation
Robust construction and precision-engineered components ensure continuous, trouble-free production with high operating rates .
✅ Excellent Thermal Efficiency
Optimized kiln design and advanced sealing technology minimize heat loss, reducing fuel consumption and operating costs. Kiln heat efficiency reaches 75-85% .
✅ Low Maintenance Requirements
Simple structure with minimal wearing parts means reduced downtime and lower maintenance costs. With routine care, the kiln liner lasts 7-10 years .
✅ Strong Adaptability
The kiln accommodates various fuel types (gas, coal, oil) and can process different grades of magnesite, making it suitable for diverse production scenarios .
✅ Advanced Sealing Technology
Reliable kiln head and tail sealing systems ensure effective dust control and prevent cold air infiltration, maintaining optimal thermal conditions .
✅ Flexible Control
Variable speed drives and optional automation systems allow precise control over kiln rotation speed and temperature profiles .
Process Flow & Technical Parameters
Typical Production Process
The magnesite calcination process using our rotary kilns follows these steps:
Raw Material Preparation: Magnesite ore is crushed and screened to appropriate size (10-40mm or 40-80mm)
Feeding: Material enters the kiln via the feed chute
Calcination: Material progresses through preheating, decomposition, and sintering zones
Discharge: Calcined product exits at the kiln head
Cooling: Product passes through a cooling system
Storage/Packaging: Final magnesium oxide product is prepared for shipment
Technical Parameter Range (Representative Models)
| Product specifications(m) | Kiln dimensions | Capacity(t/d) | Rotation speed(r/min) | Motor power(kw) | Total weight(t) | Note |
| Diameter(m) | Length(m) | Obliquity(%) |
| Φ2.5×40 | 2.5 | 40 | 3.5 | 180 | 0.44-2.44 | 55 | 149.61 | Kiln with shaft cyclone preheater |
| Φ2.5×50 | 2.5 | 50 | 3 | 200 | 0.62-1.86 | 55 | 187.37 | ---- |
| Φ2.5×54 | 2.5 | 54 | 3.5 | 204 | 0.48-1.45 | 55 | 196.29 | ---- |
| Φ2.7×42 | 2.7 | 42 | 3.5 | 320 | 0.10-1.52 | 55 | 198.5 | ---- |
| Φ2.8×44 | 2.8 | 44 | 3.5 | 400 | 0.437-2.18 | 55 | 201.58 | Outside disassemble kiln |
| Φ3.0×45 | 3 | 45 | 3.5 | 500 | 0.5-2.47 | 75 | 210.94 | ---- |
| Φ3.0×48 | 3 | 48 | 3.5 | 700 | 0.6-3.48 | 100 | 237 | Outside disassemble kiln |
| Φ3.0×60 | 3 | 60 | 3.5 | 300 | 0.3-2 | 100 | 310 | Alumyte-alumina forge kiln |
| Φ3.2×50 | 3.2 | 50 | 4 | 1000 | 0.6-3 | 125 | 278 | Outside disassemble kiln |
| Φ3.3×52 | 3.3 | 52 | 3.5 | 1300 | 0.266-2.66 | 125 | 283 | Kiln with preheater precalcine |
| Φ3.5×54 | 3.5 | 54 | 3.5 | 1500 | 0.55-3.4 | 220 | 363 | Kiln with preheater precalcine |
| Φ3.6×70 | 3.6 | 70 | 3.5 | 1800 | 0.25-1.25 | 125 | 419 | Generating kiln for using ofterheat |
| Φ4.0×56 | 4 | 56 | 4 | 2300 | 0.41-4.07 | 315 | 456 | Kiln with preheater precalcine |
| Φ4.0×60 | 4 | 60 | 3.5 | 2500 | 0.396-3.96 | 315 | 510 | Kiln with preheater precalcine |
| Φ4.2×60 | 4.2 | 60 | 4 | 2750 | 0.4-3.98 | 375 | 633 | Kiln with preheater precalcine |
| Φ4.3×60 | 4.3 | 60 | 3.5 | 3200 | 0.396-3.96 | 375 | 583 | Kiln with preheater precalcine |
| Φ4.5×66 | 4.5 | 66 | 3.5 | 4000 | 0.41-4.1 | 560 | 710.4 | Kiln with preheater precalcine |
| Φ4.7×74 | 4.7 | 74 | 4 | 4500 | 0.35-4 | 630 | 849 | Kiln with preheater precalcine |
| Φ4.8×74 | 4.8 | 74 | 4 | 5000 | 0.396-3.96 | 630 | 899 | Kiln with preheater precalcine |
| Φ5.0×74 | 5 | 74 | 4 | 6000 | 0.35-4 | 710 | 944 | Kiln with preheater precalcine |
| Φ5.6×87 | 5.6 | 87 | 4 | 8000 | Max4.23 | 800 | 1265 | Kiln with preheater precalcine |
| Φ6.0×95 | 6 | 95 | 4 | 10000 | Max5 | 950×2 | 1659 | Kiln with preheater precalcine |
Note: Custom configurations are available to meet specific customer requirements.
Applications
The magnesite rotary kiln is widely used in:
Magnesium Ingot Production: Calcining dolomite for the Pidgeon process
Refractory Manufacturing: Producing light-burned and sintered magnesia for basic refractories
Chemical Industry: Manufacturing magnesium oxide for chemical applications
Metallurgy: Processing various metallurgical minerals
Why Choose Henan Hongke Heavy Machinery?
As a high-tech enterprise integrating scientific research, production, and marketing, Henan Hongke Heavy Machinery Co., Ltd. has over a decade of experience in manufacturing rotary kilns, dryers, crushers, and complete mineral processing equipment . Our commitment to quality, innovation, and customer satisfaction ensures that every magnesite rotary kiln delivers outstanding performance and long-term value.
Our Services Include:
Custom Design: Tailored solutions based on your specific material characteristics and capacity requirements
Full Technical Support: From design and production to installation and commissioning
Overseas Service: Engineers available to service machinery at project sites worldwide
Standard Export Packaging: Suitable for safe sea freight transportation
Contact Us
Ready to discuss your magnesite calcination needs? Contact Henan Hongke Heavy Machinery Co., Ltd. for a customized quotation. Provide us with:
Material type to be processed
Raw material input size
Desired output size
Required production capacity (per hour or per day)
Our engineering team will recommend the most suitable kiln model for your specific application.
Henan Hongke Heavy Machinery Co., Ltd. – Your Trusted Partner in Rotary Kiln Solutions
Rotary Kiln
Lime Rotary Kiln
