Dolomite and magnesite are core raw materials for magnesia refractories, lightweight magnesium oxide, and magnesium metal. Efficient calcination and purification—with precise temperature control to remove CO₂, moisture and impurities, and avoid magnesia over/under-burning—is key to their value. Conventional equipment struggles with poor dual-ore compatibility, unstable magnesium content, and high energy consumption. Our Dolomite Magnesite Rotary Kiln, designed for both minerals’ calcination characteristics, uses dual-ore adaptation, precise staged temperature control, and full-process energy conservation to produce high-purity calcined dolomite (CaO, MgO) and light-burned magnesite (MgO ≥90%), meeting demands of refractory, magnesium chemical, and magnesium alloy industries.

1. Core Technologies: Ensuring Precise Dual-Mineral Calcination & High Purity

Dolomite (decomposition temperature 700-900°C) and magnesite (1000-1200°C) have distinct calcination characteristics. Our core technologies overcome traditional bottlenecks:

- Mineral-Adaptive Pretreatment System: Customized processing for each mineral: Dolomite (Mohs 3.5-4.5) is jaw-crushed to 10-30mm (preventing excessive pulverization) and airflow-separated to ≤2% mud content. Magnesite (Mohs 3.5-5.0) is cone-crushed to 5-20mm and passed through a 12,000 GS magnetic separator to reduce Fe₂O₃ to ≤0.5%. It supports 3:7-7:3 mix ratios with ±0.5% batching accuracy via belt scale.

- Segmented Precision Temperature Control: A dual-ore adaptive temperature curve with three sections: preheating (400-600°C, moisture removal), decomposition (700-900°C for dolomite, 1000-1200°C for magnesite, CO₂ decomposition), and holding (±50°C of decomposition temp, complete reaction). Dedicated burners and infrared thermometers control temperature fluctuations within ±15°C, avoiding overburning (reduced CaO activity) and underburning (residual CO₂).

2. Application Scenarios: Covering the Entire Magnesium Material Chain

The equipment calcines dolomite and magnesite separately or in combination, tailored to three core downstream fields:

- Magnesia Refractory Industry: Produces calcined dolomite (magnesia-calcium bricks) and light-burned magnesite (refractory mortar), used in steel converter and cement rotary kiln linings. Products offer strong slag resistance and ≥1.5 MPa bond strength; customizable capacity: 100,000-500,000 tons/year (suitable for large refractory groups).

- Magnesium Chemical Industry: Outputs light-burned magnesite (light MgO, magnesium sulfate/hydroxide) and calcined dolomite (magnesium calcium powder) for desulfurization, pharmaceuticals, and agriculture. Adjusting calcination temperature (e.g., 1050°C for desulfurization) ensures MgO activity ≥60%; capacity: 50,000-200,000 tons/year (small-medium chemical companies).

- Magnesium Alloy Industry: Provides calcined dolomite (magnesium smelting flux) and light-burned magnesite (alloy refining), supporting automotive and aerospace applications. Calcined dolomite: CaO ≥55%, SiO₂ ≤1.0%; light-burned magnesite ensures alloy purity ≥99.5%; capacity: 300,000-1,000,000 tons/year (large magnesium companies).

3. Operational Logic: From Pretreatment to Purification

The equipment follows "raw material adaptation - staged temperature control - quality control" with six key steps for stable high-purity output:

1. Raw Material Pretreatment: Dolomite (10-30mm, impurity-screened); magnesite (5-20mm, 12,000 GS magnetic separation, Fe₂O₃ ≤0.5%).

2. Proportioning & Transportation: Separate calcination feeds directly to silos; mixed calcination uses belt scales (3:7-7:3 ratio) and sealed bucket elevators (no moisture/secondary contamination).

3. Preheating & Drying: Vertical preheater uses 1100-1300°C flue gas to heat dolomite to 600°C (moisture ≤0.5%) and magnesite to 800°C (preliminary CO₂ decomposition).

4. Kiln Calcination: Tilted (3.5%-5%) kiln driven by a gear ring (0.3-1.8 rpm adjustable); dedicated burners adjust fuel (natural gas/pulverized coal/coke oven gas) for stable decomposition, CO₂ decomposition rate ≥98%.

5. Cooling & Purification: 800-1000°C products cooled to ≤100°C via sleeve cooler; vibrating screening (fine particle removal) and airflow separation (high-end refractories, SiO₂ removal) ensure 5-25mm particle size. Unqualified products are re-calcined.

4. Service Guarantee: Full-Cycle Support

As a professional magnesia equipment manufacturer, we provide comprehensive services:

- Customized Solutions: Based on raw material characteristics, product needs, and capacity, we offer layout, calcination curves, ROI calculations, and small-scale pilot tests (e.g., ensuring MgO ≥92% for light-burned magnesite).

- Installation & Commissioning: Experienced engineers assemble core components; 30-day continuous trial run optimizes parameters for stable quality and capacity.

- Training & Maintenance: Specialized training (pretreatment, parameter adjustment, troubleshooting); 24/7 after-sales service.