生石灰消化行为对钒钛磁铁精粉烧结制粒的影响  

Effects of Quicklime Digestion Behavior on the Granulation of Vanadium Titano-magnetite Concentrate

作　　者：刘东辉 李俊华[1] 张建良[2] 王广伟[2] 彭悦[1] 姜曦[3] Liu Donghui;Li Junhua;Zhang Jianliang;Wang Guangwei;Peng Yue;Jiang Xi(School of Environment,Tsinghua University,Beijing 100084,China;School of Metallurgy and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Marketing Representative Manager,China Iron and Steel Association,Beijing 100711,China)

机构地区：[1]清华大学环境学院,北京100084 [2]北京科技大学冶金与生态工程学院,北京100083 [3]中国钢铁工业协会市场调研部,北京100711

出　　处：《钢铁钒钛》2019年第6期84-89,共6页Iron Steel Vanadium Titanium

摘　　要：研究了生石灰消化行为对锐钛磁铁精粉烧结制粒的影响规律。研究结果表明:不同生石灰消化后粒度分布指数差异较大,影响生石灰消化后粒度分布行为的主要因素是生石灰的化学成分和矿物组成。生石灰消化后的粒度分布指数与锐钛磁铁精粉的颗粒长大指数、均匀性指数和抗热粉化指数呈正相关,与破损指数呈负相关。相对于中钛型和高钛型饥钛磁铁精粉而言,低钛型锐钛磁铁矿的破损指数受消化后粒度分布指数的影响较小。消化后粒度分布指数大的生石灰,其在混合料中分布均匀,消化放热使得准颗粒小球中消石灰胶体颗粒均匀收缩,准颗粒小球中各组分粘结的更加紧密且烧结抽风过程中准颗粒小球各向热应力均衡,在一定程度上抑制了准颗粒小球的热粉化现象。Effects of quicklime digestion behavior on the granulation of the vanadium titano-magnetite concentrate were investigated by using micro-drum granulation equipment.The results show that there exist great difference in the particle size distribution index(PDI) of different kinds of quicklime after hydration with water.The main reasons for the great difference of PDI are chemical composition and mineral structure.The PDI has positive correlations with the granulation index(GI),uniformity index(UI),and resistance index of the thermal disintegration(KI),but has negative correlations with the damage index(DI) of vanadium titanium magnetite concentrate.The effect of PDI on the DI is comparatively low for low-titanium magnetite concentrate compared with the other two concentrates.The quicklime with high particle size distribution index is good for its uniform distribution in the sinter mixture.The heat from hydration action of the quicklime can make the lime particles in the quasi-particles shrunk,and the particles in the quasi-particles are bonded more tightly and the isotropic thermal stress is more balanced,which is beneficial to the improvement of the hot property of the quasi-particles.

关 键 词：烧结 锐钛磁铁精粉 制粒 生石灰 消化行为 配矿 

分 类 号：TF046.4[冶金工程—冶金物理化学]