回转窑内结圈物特性分析  

Characteristic analysis of ring-forming material in rotary kiln

作　　者：甄彩玲 梁功庆 潘建[2] 朱德庆[2] 郭正启[2] 李思唯 李会义 周晓军 ZHEN Cailing;LIANG Gongqing;PAN Jian;ZHU Deqing;GUO Zhengqi;LI Siwei;LI Huiyi;ZHOU Xiaojun(Ezhou Pelletizing Co.,Ltd.,Wusteel Resources Group,Ezhou 436000,Hubei,China;School of Minerals Processing and Bioengineering,Central South University,Changsha 410083,Hunan,China)

机构地区：[1]武钢资源集团鄂州球团有限公司,湖北鄂州436000 [2]中南大学资源加工与生物工程学院,湖南长沙410083

出　　处：《中国冶金》2024年第7期42-50,共9页China Metallurgy

基　　金：国家自然科学基金资助项目(52174329)。

摘　　要：回转窑结圈现象是限制回转窑制备氧化球团矿发展的重要因素。采用XRD和SEM-EDS分析回转窑氧化球团和结圈物的化学成分、显微结构、矿相组成及元素分布,以揭示结圈物形成机理。研究结果表明,结圈物主要为赤铁矿,其次为石英、钙铁橄榄石、钙镁橄榄石、长石等硅铝酸盐。球团矿产生的粉末及煤灰在高温下形成低熔点化合物,并形成液相渗入球团矿。液相中的赤铁矿在球团矿表面重结晶、再结晶,形成稳定的结圈物。通过改善配矿结构降低硅及碱金属含量、优化燃料资源质量减少低熔点物质的摄入、提高各工序操作条件来减少粉末的摄入,可有效抑制结圈现象。The phenomenon of ring-formation in rotary kilns is a crucial factor that impedes the development of oxidized pellets produced by rotary kiln.The chemical composition,microstructure,mineral phase composition and element distribution of oxidized pellets and ring-forming material in rotary kiln were analyzed by XRD and SEM-EDS to elucidate the formation mechanism of ring-forming material.The findings indicate that the primary ring-forming material is hematite,followed by quartz,calcium ferric olivine,calcium magnesium olivine,feldspar,and other silico aluminate compounds.The powder generated by the pellets and coal ash forms low-melting-point compounds that liquefy at high temperatures and infiltrate into the pellets.The hematite in the liquid phase then re-crystallizes and adheres to the pellet surface,resulting in the formation of stable ring-forming material.By improving the ore blending structure to reduce the content of silicon and alkali metals,optimizing the quality of fuel resources to reduce the intake of low-melting-point substances,and improving the operating conditions of each process to reduce the intake of powder,the ring-forming phenomenon can be effectively inhibited.

关 键 词：回转窑 结圈 煤灰 液相 再结晶 

分 类 号：TF046.6[冶金工程—冶金物理化学]