基于熔剂分布均质化概念的碱性球团配矿新模式

Alkaline pellet new ore blending mode based on concept of flux distribution homogenization

发展碱性球团生产、高炉实行高比例球团冶炼是铁前工艺绿色低碳发展的重要途径。碱性球团的固结过程比较复杂,在分析碱性球团的固结过程、理论计算碱性球团液相以及研究磁铁精粉与碱性熔剂反应能力的基础上,提出碱性熔剂分布均质化的概念,并解释了其存在的3个逻辑层次和微观反映。分析表明,碱性球团在实现碱性熔剂均质化后能够获得更好的固结质量和冶金性能。首钢京唐球团基于碱性熔剂分布均质化概念的新型配矿模式生产实践表明,熔剂分布均质化后,球团固结质量保持在较高水平,成品球抗压强度超过3 200 N,还原膨胀率由16.5%降低至15.2%左右,还原度由86.72%升高至88.90%,低温还原粉化指数IRD+3.15小幅降低,熔剂分布均质化效果明显。

Developing alkaline pellets production and keeping high proportion pellet smelting in blast furnace are important ways for the green and low-carbon development of pre iron process.The consolidation process of alkaline pellets was relatively complex,so based on the analysis of consolidation process for alkaline pellets,theoretical calculation of the liquid phase for alkaline pellets,and the study of reaction ability between magnetic powder and alkaline flux,the concept of homogenization for alkaline flux distribution was proposed,and the three logical levels and micro reflections of its existence were explained.Analysis shows that only by homogenizing alkaline flux can alkaline pellets obtain better consolidation quality and metallurgical properties.The production practice of a new ore blending mode of Shougang Jingtang pellets based on the concept of homogenization for alkaline flux distribution shows that after homogenizing flux distribution,the consolidation quality of pellets remains at a high level,and the compressive strength of finished pellets exceeds 3200 N,the reduction swelling index decreases from 16.5%to about 15.2%,the reduction index increases from 86.72%to 88.90%,and the IRD+3.15 decreases slightly,then the homogenization effect of flux distribution is obvious.