Titanium dioxide TiO2 calcination rotary kiln

1.Product Introduction Calcination Rotary Kiln

The Titanium Dioxide Calcination Rotary Kiln is the core thermal engineering equipment used in both the sulfate and chloride processes of titanium dioxide production. It is specifically designed for the high-temperature treatment of hydrolyzed metatitanic acid filter cakes to complete the processes of dehydration, desulfurization, and crystalline phase transformation (from Anatase to Rutile), ultimately producing high-purity titanium dioxide pigments.

2.Application Calcination Rotary Kiln

1. Titanium Dioxide Production (Pigment Grade)
Over 90% of the world's pigment-grade is produced via rotary kiln calcination (Sulfate Process). It serves as the premier white pigment and opacifier for:

• Coatings & Paints: Providing high "hiding power" and weather resistance for architectural and automotive coatings.
• Plastics & Polymers: Preventing yellowing and enhancing opacity in PVC, PE, and specialized engineering plastics.
• Inks, Paper, & Rubber: Used for high-brightness printing, premium bleached paper, and durable rubber compounds.

2. Advanced Functional Materials
Precision calcination allows for the production of specialized variants:

• Cosmetics & Personal Care: Providing non-toxic, high-UV-shielding properties for sunscreens and foundation.
• Industrial Consumables: Serving as a critical component in welding electrode coatings to stabilize the arc and improve slag fluidity.
• Specialty Ceramics: Used as a raw material for 3D-printed ceramics and high-performance photocatalysts for air and water purification.

3. New Energy Sector
In the renewable energy field, the purity and particle size distribution of are vital:

• Perovskite Solar Cells: Calcined acts as the Electron Transport Layer (ETL). Its crystal purity and phase consistency (specifically the rutile/anatase ratio) directly impact the photoelectric conversion efficiency and long-term stability of the cell.

4. Ceramics and Glass Industry
Calcination ensures the removal of impurities and the stabilization of crystal phases required for:

• High-Whiteness Glazes: Providing the brilliant white finish for sanitary ware and domestic porcelain.
• Enamel Coatings: Used in the frit for domestic appliances and industrial reactors to provide acid and alkali resistance.
• Optical Glass: Serving as an additive to adjust the refractive index and dispersion properties of precision lenses.

3.Working Principle Calcination Rotary Kiln

• Material Transport & Tumbling: The wet metatitanic acid filter cake enters from the kiln tail. As the cylinder rotates, internal lifting flights (lifters) repeatedly lift and shower the material through the hot gas stream, ensuring maximum surface area exposure and uniform heat exchange.
• Precision Temperature Gradient Control:
  • Drying Zone (200–400°C): Removal of free moisture and a portion of the chemically bound water.
  • Desulfurization Zone (400–600°C): Decomposition of residual sulfate impurities, releasing gas to ensure chemical purity.
  • Phase Transformation Zone (600–800°C): The critical transition where Anataseconverts to Rutile. This stage determines the final product's optical properties and UV weather resistance.
  • Sintering Zone (800–1,000°C): Particles undergo controlled growth and sintering to form dense, high-refractive-index rutile crystals.
• Counter-Current Heat Exchange: Clean thermal energy (860–1,000°C) from the combustion chamber is injected from the kiln head. Moving in the opposite direction of the material, this counter-current flow creates high-efficiency convective heat transfer, maximizing thermal utilization.
• Off-gas Management: Calcination exhaust gases pass through Electrostatic Precipitators (ESP) and Waste Heat Recovery (WHR) boilers to recapture energy and remove dust before discharge, achieving a synergy between energy savings and environmental compliance.

4.Advantages Calcination Rotary Kiln

• Continuous High Throughput: Supports 24/7 uninterrupted production. A single production line can reach a daily capacity of 610 tons, far exceeding the capabilities of fixed-bed shaft kilns or fluidized bed systems.
• Controllable Crystal Structure: Through precise temperature profiling and residence time regulation, the system consistently produces high-purity Rutile TiO₂, satisfying the rigorous standards of premium coatings and photovoltaic materials.
• Superior Feed Adaptability: The system can handle raw materials with varying moisture contents and particle sizes, showing high tolerance for fluctuations in ore grade and complex feedstock compositions.
• Full Process Automation: Integrated with a DCS (Distributed Control System), the kiln automatically adjusts rotational speed, feed rates, fuel ratios, and internal atmosphere, minimizing manual intervention and enhancing operational stability.

5.Technical Specifications

6.Our Solutions