Determining optimal operation parameters for reducing PCDD/F emissions (I-TEQ values) from the iron ore sintering...

Area of Science:

• Environmental Science
• Chemical Engineering
• Materials Science

Background:

• Iron ore sintering processes generate polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs).
• Controlling PCDD/Fs emissions is crucial for environmental protection in the iron and steel industry.

Purpose of the Study:

• To identify optimal operating conditions for minimizing PCDD/Fs formation during iron ore sintering.
• To evaluate the impact of key operating parameters on PCDD/Fs emission factors.

Main Methods:

• Utilized Taguchi experimental design for process optimization.
• Conducted pilot-scale sinter pot experiments simulating real-scale operations.
• Analyzed results using Analysis of Variance (ANOVA).

Main Results:

• An optimal combination of operating parameters (6.5 wt% water content, 500 mm bed height, 1000 mmH2O suction pressure, and hematite hearth layer) reduced total PCDD/Fs emission factors by 62.8%.
• Water content was identified as the most significant parameter, contributing 74.7% to the reduction.
• Sinter productivity and strength were slightly enhanced.

Conclusions:

• The identified optimal operating conditions effectively reduce PCDD/Fs emissions from iron ore sintering.
• The optimized process parameters are applicable to real-scale sinter production without compromising productivity or strength.