Study on the Roasting Process of Guisha Limonite Pellets.

Area of Science:

• Metallurgical Engineering
• Materials Science

Background:

• Guisha limonite presents a low-cost, abundant resource for iron-making.
• Traditional sinter production contributes significantly to greenhouse gas emissions.
• Depletion of high-grade iron ore necessitates efficient utilization of alternative resources.

Purpose of the Study:

• To develop and optimize a pelletizing method for Guisha limonite as a sinter alternative.
• To reduce greenhouse gas emissions in the iron-making process.
• To provide a technical foundation for lignite pellet-roasting in the steel industry.

Main Methods:

• Response surface methodology for experimental design optimization.
• Box-Behnken experimental design to study key factors.
• Multivariate regression modeling to predict pellet compressive strength.
• Analysis of Variance (ANOVA) to determine factor influence.

Main Results:

• Optimized pelletizing conditions were identified.
• A multivariate regression model accurately estimated pellet compressive strength.
• Maximum compressive strength achieved was 2705 N, with a 5.20% relative error from the target value.
• Roasting temperature, pellet diameter, and bentonite content were identified as key influencing factors.

Conclusions:

• The developed pelletizing method is effective for Guisha limonite.
• This approach offers a viable, lower-emission alternative to traditional sinter.
• The findings support the comprehensive utilization of ore resources in the iron and steel industries.