High quality pellet preparation technology based on particle size distribution regulation
China's domestically produced magnetite concentrates offer cost advantages over imported concentrates,but some of them affect the preparation of high quality pellets due to deviations in pelletizing performance,and the development of more economical and effective control techniques is of great practical importance for the efficient utilization of such iron concentrates.Three typical iron ore concentrates(A,B,and C)with varying particle sizes(coarse,smooth,and ultra-fine)to elucidate the factors affecting pellet performance were examined.It was found that excessively coarse or fine particles and smooth surfaces negatively impact green pellet quality,leading to deviations in preheated and roasted pellet quality.The optimal allocation method of low-quality iron ore concentrate based on particle size composition control was established.Based on the differences and complementarity of physical properties and pelletizing performance of different types of iron ore concentrates,the preferred allocation scheme was 1∶4 for A ore∶B ore and 1∶1 for A ore∶C ore to meet the content of ore concentrates with less than 0.044 mm particle size for 60 mass％-70 mass％,which can significantly improve the pellet performance index;and the mechanism of pellet quality improvement was revealed.Ore concentrates with particle sizes less than 0.044 mm have a greater influence on the green pellet bursting temperature,and the oxidation reaction rate is faster compared with other particle grades,which is beneficial to improve the pellet strength under the same conditions.
万方数据
维普
