Bentonite for Pelletizing: A Key Binder in Iron Ore Pelletizing Process
What is Bentonite?
Bentonite is a naturally occurring clay primarily composed of montmorillonite, a mineral known for its exceptional ability to absorb water and expand. When mixed with water, it transforms into a gel-like consistency, making it useful in several industries.
One of its most important applications is in the iron ore pelletizing process, where it acts as a powerful binder. Bentonite is formed from the alteration of volcanic ash and is available in two main types:
- Sodium Bentonite – valued for its high swelling and binding capacity (most common in pelletizing).
- Calcium Bentonite – less expansive, used in other industrial applications.
What is Pelletizing Bentonite?
Pelletizing Bentonite is a high-purity grade of sodium bentonite used as a binder in the iron ore pelletizing process. When combined with iron ore concentrates, it helps form strong, spherical pellets that serve as feedstock in blast furnaces and DRI (Direct Reduced Iron) plants.
Key benefits include:
- Enhanced mechanical strength of pellets
- Better thermal resistance for high-temperature processes
- Improved durability during handling and transportation
Applications of Pelletizing Bentonite
- Iron Ore Pelletizing – Acts as a binder for iron ore fines, forming durable pellets used in blast furnaces.
- Steel Industry – Essential for producing Direct Reduced Iron (DRI) by binding ore particles.
- Mining Sector – Ensures pellets are compact, improving ore handling and storage.
Chemical and Physical Properties of Pelletizing Bentonite
| Property | Specification |
|---|---|
| Chemical Composition | Mainly montmorillonite, traces of feldspar, quartz, etc. |
| Moisture Content | 10–12% |
| Plasticity | High – aids pellet formation and adhesion |
| Bulk Density | 0.9–1.1 g/cm³ |
| pH Value | 8.5–9.5 |
| Viscosity | 25–40 cps (application dependent) |
| Swelling Capacity | Expands up to 15 times its dry volume |
| Cation Exchange Capacity | 80–95 meq/100g |
| Fineness | 85% passing through 200 mesh sieve |
| Specific Gravity | 2.6–2.8 |
| Sulphur Content | < 0.5% |
| Iron Content | 55–63% |
| Attrition Value | Max 7.5% |
About ELITE MINING
ELITE MINING, based in Kutch, Gujarat, India, is a trusted name in the bentonite mining and processing industry. We specialize in high-quality pelletizing bentonite, ensuring that our customers in iron ore, steel, and mining sectors receive reliable products that enhance operational efficiency.
With advanced processing technology and direct access to Gujarat’s rich deposits, we deliver consistent, high-performance bentonite trusted by industries worldwide.
Pelletizing Bentonite Production Process
- Mining – Extracted through surface mining techniques.
- Sodium Activation – Treated with sodium carbonate (Na₂CO₃) to enhance swelling and binding capacity.
- Drying & Milling – Dried and milled to achieve required particle size.
- Agglomeration – Processed to improve flowability and binder effectiveness.
Benefits of Pelletizing Bentonite
- Moisture Absorption – Helps in proper pellet formation.
- High Strength – Increases compressive and bending strength of pellets.
- Thermal Resistance – Withstands high-temperature smelting and reduction.
- Faster Drying – Speeds up moisture removal for efficient production.
Conclusion
Pelletizing Bentonite plays a vital role in producing strong, durable, and heat-resistant iron ore pellets. Its unique swelling capacity and binding properties make it an indispensable material for the iron and steel industry.
At ELITE MINING, we provide premium-grade pelletizing bentonite, ensuring reliability, efficiency, and superior performance for industries worldwide.
