【摘要】 本文以高品位磁铁精矿（O矿）、高镁磁铁精矿（K矿）和高硅赤铁矿粉（Y矿）为原料，根据某钢厂现场原料配比40%O矿+20%K矿+40%Y矿，在实验室开展模拟带式焙烧机工艺的高硅镁质熔剂性球团制备特性研究，揭示了二元碱度（CaO/SiO₂为0.5～0.9）对球团焙烧特性、成品球团冶金性能(还原度RI、还原膨胀指数RSI和动态法低温还原粉化指数LTD_{+3.15 mm})和矿相学特征的影响规律。结果表明：提高球团碱度有利于改善球团焙烧和冶金性能，在0.5～0.9的碱度范围内，球团的还原度≥65.38%、还原膨胀指数15%、动态低温还原粉化性能优良（≥98.88%）。矿相分析结果表明，所制备高硅镁质熔剂性球团的固结形式主要为Fe₂O₃再结晶，提高碱度利于形成更多液相从而促进固结，降低球团孔隙率，从而生产出性能良好的成品球团。本研究将为工业生产实践提供有力支撑和重要借鉴。更多还原

【Abstract】 The present work adopts high grade magnetite concentrate（O ore）,high magnesium magnetite concentrate（K ore）and high silicon hematite fines（Y ore）as raw materials to investigate the preparation characteristics of high silica Mg-bearing fluxed pellets at laboratory scale based on straight grate process in terms of a typical industrial pellet blend consisting of 40% Ore O,20% Ore K and 40% Ore Y.The effects of binary basicity [w（CaO）/w（SiO₂）is 0.5～0.9] on pellet roasting characteristics, metallurgical properties(reduction index RI,reduction swelling index RSI and dynamic low temperature reduction disintegration index(LTD_{+3.15 mm})and mineralogy characteristics of the resultant fired pellets were researched.The results show, increasing pellet basicity is capable of improving the reducibility of fired pellets with high RI of more than 65.38%,low RSI of lower than 15%,and excellent LTD_{+3.15 mm} of more than 98.88%.The mineralogical analysis of the fired pellets revealed that the consolidation form of pellets mainly relies on Fe₂O₃ recrystallization while an increase in pellet basicity is conducive to the formation of more liquid phase to promote consolidation and a decrease in the porosity of pellets.Hence, the finished pellets with good performance can be obtained.The experimental results will provide strong support and important reference for industrial production practice.更多还原