基于返矿分流的烧结强化制粒技术研究  

Study on process of strengthening granulation based on sinter returns and BF returns shunting

作　　者：王兆才[1,2] 周志安 何国强[1] 范晓慧 甘敏[2] 胡兵[1] Wang Zhaocai;Zhou Zhian;He Guoqiang;Fan Xiaohui;Gan Min;Hu Bing(Zhongye Changtian International Engineering Co.,Ltd.,Changsha 410205,Hunan;School of Mineral Processing and Bioengineering,Central South University,Changsha 410083,Hunan)

机构地区：[1]中冶长天国际工程有限责任公司,湖南长沙410205 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《烧结球团》2018年第4期12-16,共5页Sintering and Pelletizing

基　　金：长沙市科技计划项目(kq1703008)

摘　　要：由于烧结过程的自动蓄热作用,厚料层烧结作为一种行之有效的节能提质技术被国内外各大烧结企业广泛应用。本文针对粉矿为主的烧结原料提出了一种返矿分流强化制粒技术,即将一部分粗颗粒返矿单独处理而不直接参与制粒,使得剩余混合料中成核粒子含量与黏附粉含量的比例更有利于制粒要求,同时改变物料中水分的分布状态,提升物料的制粒效果。研究了返矿分流对混合料制粒和烧结指标的影响。结果表明,采用返矿分流强化制粒工艺后,在同等制粒水分条件下,制粒小球平均粒度由4.27 mm提升至4.58mm,制粒效果得到明显改善;烧结速度和利用系数分别从21.66 mm/min、1.46 t/(m2·h)提高到23.86 mm/min、1.54 t/(m2·h)。研究结果有助于将料层厚度从700 mm提高至780 mm。Due to auto accumulation of heat during the sintering process,the deep-bed sintering is an effective way to save energy and improve quality,which is used in large sinter plants at home and abroad. This paper presents a process of strengthening granulation based on sinter returns and BF returns shunting for iron ore fines which are used as the main sintering raw materials,that is,a part of coarse-grained returns will be processed individually but not granulated directly,then the content of nucleated particles and adhesive powder of the rest of mixture is more favorable for meeting the requirements of granulation,and meanwhile changing the distribution of the water in the material can improve granulation. The influences of returns shunting on mixture granulation and sintering indexes are studied,and the result shows that,after using the process of strengthening granulation based on returns shunting,under the same condition of granulation moisture,the average granulated particle size is increased to 4. 58 mm from 4. 27 mm,which is a significant improvement,the sintering speed and utilization factor are increased to 23. 86 mm/min and 1. 54 t/（ m2·h） from 21. 66 mm/min and 1. 46 t/（ m2·h） respectively. Meanwhile the research result will help the bed depth increase to 780 mm from 700 mm.

关 键 词：烧结 返矿分流 厚料层 强化制粒 节能降耗 

分 类 号：TF046.4[冶金工程—冶金物理化学]