Abstract
The effect and mechanism of magnetite concentrate morphology on the quality of indurated pellets were investigated. Concentrates with different morphologies were prepared using high-pressure grinding rolls (HPGR) and ball mill (BM) grinding techniques. Then pelletizing and induration process is done in the temperature range of 800 to 1300 °C. With similar specific surface area for both BM and HPGR concentrates, the morphology of HPGR concentrate had a broad particle size distribution with a high aspect ratio for particles. Results showed that the porosity and FeO content of indurated HPGR and BM pellets decreased with increasing temperature while their cold compressive strength (CCS) increased. However, the porosity and FeO content of HPGR pellets were lower than BM pellets. Also, the CCS of indurated HPGR pellets at temperatures above 1100 °C was significantly higher than BM pellets. Microstructural analysis was performed on concentrate powder, fracture surface, and cross-section of pellets to analyze the mechanism of morphological influences. It was found that the irregular shape and broad particle size distribution of HPGR particles improved the CCS of HPGR pellets due to the improved sintering, increased interlocking force, longer crack propagation path, formation of the uniform liquid phase distribution, and decreased the pellet porosity.
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