熔剂性球团低温还原粉化问题解析  

Analysis of low temperature reduction pulverization of fluxed pellets

作　　者：王英春 胡启晨 WANG Yingchun;HU Qichen(MCC Jingcheng Engineering Technology Co.,Ltd.,Beijing,100176,China)

机构地区：[1]中冶京诚工程技术有限公司,北京100176

出　　处：《烧结球团》2024年第4期70-76,共7页Sintering and Pelletizing

基　　金：湖北省重点研发项目(21314001D);山西省科技重大专项计划(202201050201011)。

摘　　要：熔剂性球团的应用是实现高炉降本增铁的有效途径,研究熔剂性球团在高炉内的还原行为很有必要。本文重点探讨分析了两种企业熔剂性球团的低温粉化问题,经过试验检测,1#、2#球团的RDI>3.15 mm分别仅为75.59%与81.74%,两者粉化性能均较差。通过分析研究发现,两种球团内部孔隙占比分别为54.31%和56.46%,内部渣相较多,影响赤铁矿连晶;焙烧过程中渣相的开始熔化温度较低,分别为999.7℃和1046.8℃,同时产生渣量较大,分别达到了24.2 g和21.3 g,球团内部结构疏松,粉化性能差。生产中可以通过加强混料,调整脉石成分来控制渣相成因、渣相组分和渣相黏度,从而改善其低温还原粉化指数。The application of flux pellets is an effective way to reduce the cost and increase the iron output,it is necessary to study the reduction behavior of fusible pellets in the blast furnace.This paper focuses on the analysis of low-temperature pulverization of two types of flux pellets.After experimental testing,the RDI>3.15 mm of 1#and 2#pellet are only 75.59%and 81.74%respectivey.Which is poor of the pulverization performance.The proportion of internal pores in the two pellets is 54.31%and 56.46%respectively.Many internal slag phases exist in the pellets,which affect the hematite joined crystal.The calculation results show that the initial melting temperature of slag phase in the two pellets during roasting is lower,which is 999.7℃ and 1046.8℃respectively.And the amount of slag in pellets is large,which is 24.2 g and 21.3 g respectively,the internal structure of the pellets is loose,and the pulverization performance is poor.The analysis shows that in production,the formation of slag phase,slag phase composition,and slag phase viscosity can be controlled by strengthening mixing and adjusting the composition of gangue,which can improve its low-temperature reduction pulverization index.

关 键 词：熔剂性球团 低温还原粉化 SiO_(2) Factsage 微观分析 

分 类 号：TF046.6[冶金工程—冶金物理化学]