Grate Kiln

Best pellet for DRI

Metso pioneered the Grate Kiln induration system and brings over 65 years of proven expertise in process engineering, equipment design, and project execution. Our comprehensive lifecycle solutions, consistently deliver top‑quality pellets while reducing fuel and power consumption, emissions, and overall operating costs.

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Original developer of the Grate Kiln

More than 65 years of experience

Highest pellet quality

The Rotary Kiln design ensures uniform mixing and heating

Optimal plant performance and flexibility

Enables processing of a wide range of ores and pellet products with no process interruption

Global service network

Expert support wherever customer operations are located

Features and benefits

Plant flexibility

Metso’s Grate Kiln offers exceptional operational flexibility, enabling processing of a wide range of ores and pellet products with no process interruption.

Benefits:

Independent control of the grate, kiln, and cooler for precise operating conditions
Ability to run on solid, liquid, gaseous, and alternative fuels, including biomass and hydrogen
Proprietary burner technologies designed to reliably handle multi‑fuel combinations
Smooth product transitions without the need for shutdowns

Plant flexibility

Metso’s Grate Kiln offers exceptional operational flexibility, enabling processing of a wide range of ores and pellet products with no process interruption.

Benefits:

Independent control of the grate, kiln, and cooler for precise operating conditions
Ability to run on solid, liquid, gaseous, and alternative fuels, including biomass and hydrogen
Proprietary burner technologies designed to reliably handle multi‑fuel combinations
Smooth product transitions without the need for shutdowns

Highest pellet quality

Metso’s Rotary Kiln design ensures uniform mixing and heating, resulting in consistently high pellet quality.

Benefits:

Premium pellets with superior physical and metallurgical properties
Excellent cold crush strength
Optimized porosity
Reduced low temperature breakdown
High reducibility, ideal for Direct Reduction (DR) applications

Optimal plant performance

Metso Grate Kiln systems are engineered for optimal plant performance and lower total cost of ownership, combining efficient process controls with durable equipment.

Performance highlights:

Smaller grate, lower operating temperatures, and a thinner pellet bed
Lower gas flow pressure → more uniform temperature profile
Reduced bottom layer pellet deformation
Lower fan power consumption
Advanced combustion and burner technologies for higher efficiency and reduced emissions
Improved heat recovery delivers significant energy savings
Digital solutions enhance process control, safety, and reliability

Industry leader

As the original developer of the Grate Kiln induration system, Metso brings more than 65 years of proprietary technology and continuous innovation.

Leadership facts:

55+ Grate Kiln systems installed worldwide
Combined annual capacity exceeding 150+ million tons
Metso is the supplier of the world’s largest and most advanced Grate Kiln installations
Supported by a global service network
Aftermarket parts available as original or improved designs
Retrofits typically deliver:
- ~3% increase in production and uptime (improved grate components)
- ~10% cost reduction (improved cooler components)