Effect of Briquetting Pressure on the Properties, Reduction Behavior, and Reduction Kinetics of Cold-Bonded Briquette Prepared From Return Fines of Sinter
Tóm tắt
Return fines of sinter were used to prepare cold-bonded briquette (CBB) with different briquetting pressure and properties, and reduction behavior and reduction kinetics of CBB were investigated in the current study. Increasing the briquetting pressure leads to the increase of the CBB’s compressive strength. The changing tendency of the CBB’s compressive strength after reduction disintegration index (RDI) experiment is similar with the CBB. With the increase of briquetting pressure, the particle size distribution of raw materials changes greatly, and the proportion of < 0.5 and 0.5–2 mm increased significantly. The porosity and reducibility index (RI) of the CBB decrease with the increase of briquetting pressure. The compressive strength of the CBB after the RI experiment and the reduction time both increase as the briquetting pressure is increased. After RI experiment, the main phases of 0 MPa CBB (briquetting pressure absent) are wüstite, metallic iron, calcium ferrite, and silicate, the main phases of periphery part of 20 to 240 MPa CBBs are wüstite, metallic iron, and silicate, and the main phases of core part of 20 to 240 MPa CBBs are wüstite, calcium ferrite, and silicate. Increasing the briquetting pressure from 0 to 240 MPa causes the reduction rate decrease. The effective diffusion coefficient of CO decreases when increasing the briquetting pressure.
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