Study on the High-Temperature Interaction between Coke and Iron Ores with Different Layer Thicknesses

Area of Science:

• Metallurgical Engineering
• Chemical Engineering

Background:

• Coke is crucial for blast furnace (BF) structure and gas permeability.
• High-temperature interactions between coke and iron ore impact BF operation, especially with declining ore quality.

Purpose of the Study:

• To investigate the high-temperature interaction between coke and iron ores with varying layer thicknesses.
• To understand the impact of coke layer thickness on gas permeability and blast furnace operation.

Main Methods:

• Utilized a melting-dropping furnace to simulate high-temperature interactions.
• Developed a gas permeability mathematical model.
• Analyzed metallographic images of coke after solution loss reactions.
• Introduced a dripping eigenvalue for molten metal evaluation.

Main Results:

• Increased coke layer thickness improved gas permeability under specific conditions.
• Coke particle size at the interface indicates the extent of melting loss reaction (smaller size = more loss).
• Molten metal dripping properties can deteriorate due to uncontrolled thickness.

Conclusions:

• Coke layer thickness significantly influences blast furnace gas permeability and operational stability.
• Optimizing coke layer thickness is essential for mitigating challenges from poor iron ore quality.
• Limiting coke layer thickness is recommended based on operational indicators and molten metal behavior.