高配比磁铁精粉制粒和烧结性能优化  

Optimization of granulation and sintering performance of high-ratio magnet concentrate

作　　者：周卫 朱德庆[2,3] 杨聪聪[2,3] 潘建 王欣[2] ZHOU Wei;ZHU Deqing;YANG Congcong;PAN Jian;WANG Xin(Sinosteel Equipment&Engineering Co.,Ltd.,Beijing 100080,China;Central South University School of Minerals Processing and Bioengineering,Changsha 410083,Hunan,China;Central South University Research Center for Low Carbon and Hydrogen Metallurgy,Changsha 410083,Hunan,China)

机构地区：[1]中钢设备有限公司,北京100080 [2]中南大学资源加工与生物工程学院,湖南长沙410083 [3]中南大学低碳与氢冶金研究中心,湖南长沙410083

出　　处：《烧结球团》2024年第1期56-64,112,共10页Sintering and Pelletizing

基　　金：国家自然科学基金青年科学基金资助项目(52004339)。

摘　　要：针对某内陆型钢铁厂进行高比例磁铁精矿(混匀矿中占比≥85%)烧结时出现的制粒效果差、烧结矿产、质量低和固体燃料消耗高等问题,为确定下一步工程技改方向,本文开展系统的烧结杯试验以揭示高配比磁铁精粉的烧结特性,探究精矿预润湿、生石灰用量、磁铁精粉配比、碱度、料层高度等因素对烧结性能及成品矿冶金性能的影响规律。结果表明:采用精矿预润湿技术和配加适量生石灰对于协同强化高配比铁精矿制粒具有促进作用,在相同制粒水分条件下,将混合铁精矿初始水分3.0%预润湿至7.8%,同时配加5.5%生石灰,制粒所得混合料的透气性指数(JPU)由14.1大幅提高到41.7;在混合料透气性得到保证的前提下,进一步提高碱度和料层厚度能显著改善烧结矿产、质量指标,且烧结矿各冶金性能指标均能满足高炉冶炼要求。本文研究成果将为现场技术改造和生产提供重要的理论依据和技术指导。In view of such problems as poor granulation effect,low quality of sintering ores and high solid fuel consumption when sintering a high-ratio magnetite concentrate(85%of mixed ore)in an inland steel mill,in order to determine the direction of the next engineering technological transformation,a systematic laboratory sintering cup test is carried out to reveal the sintering characteristics of high-ratio magnet concentrate,and to explore the influence rule of such factors as concentrate pre-wetting,quicklime dosage,magnet concentrate ratio,alkalinity,and material layer height on the sintering performance and metallurgical performance of the finished ore.The results show that the pre-wetting technology of concentrate and the addition of an appropriate amount of quicklime can promote the high-ratio iron concentrate granulation of synergistic strengthening,under the same granulation moisture conditions,the initial moisture of the mixed iron concentrate is pre-wetted from 3.0%to 7.8%,and 5.5%quicklime is added at the same time,and the air permeability index(JPU)of the granulated mixture is greatly increased from 14.1 to 41.7.On the premise that the air permeability of the mixture is guaranteed,further increasing the alkalinity and layer height can significantly improve the specification of sintering ores,and the metallurgical performance indexes of sinter can meet the requirements of blast furnace smelting.The results will provide important theoretical basis and technical guidance for on-site technical transformation and production.

关 键 词：磁铁精粉 烧结 制粒 透气性 冶金性能 

分 类 号：TF046.4[冶金工程—冶金物理化学]