钙质熔剂对熔剂性球团矿强度的影响  

Effects of calcium flux on fluxed pellets strength

作　　者：徐子轩 姜鑫 何佳 王小艾 谢云飞 沈峰满 XU Zixuan;JIANG Xin;HE Jia;WANG Xiaoai;XIE Yunfei;SHEN Fengman(School of Computer Science and Engineering,Northeastern University,Shenyang 110819,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China;Materials Technology Research Institute,HBIS Group,Shijiazhuang 050023,Hebei,China)

机构地区：[1]东北大学计算机科学与工程学院,辽宁沈阳110819 [2]东北大学冶金学院,辽宁沈阳110819 [3]河钢集团材料技术研究院,河北石家庄050023

出　　处：《中国冶金》2023年第9期11-18,共8页China Metallurgy

基　　金：辽宁省兴辽英才计划资助项目(XLYC2007152);国家自然科学基金资助项目(NSFC 52074074,51974073);国家重点研发计划资助项目(2021YFC2902401)。

摘　　要：近年来受环境保护政策的影响,熔剂性球团的相关技术开发得到普遍关注。以石灰石和生石灰为钙质熔剂,系统研究了熔剂种类及其添加量对生球、预热球团和成品球团抗压强度的影响规律与作用机理。试验结果表明,无论是采用石灰石熔剂还是生石灰熔剂,生球抗压强度均随着碱度的增加先升高后降低,当碱度R=1.0时抗压强度最高;预热球团的抗压强度均随碱度的增加而降低,延长预热时间与提高温度能提高预热球团的抗压强度。焙烧温度为1200℃时,成品球团抗压强度随碱度的升高而下降,碱度由0.06(无碱性熔剂,自然碱度)增加至2.0,石灰石球团和生石灰球团的抗压强度由2212 N/个分别降低至1070 N/个和1010 N/个;焙烧温度为1250℃时,成品球团抗压强度随碱度的升高而先升高后降低,在碱度R=0.5时达到峰值。本试验条件下,熔剂性球团的最佳碱度为0.5、焙烧温度为1250℃、焙烧时间为20 min。碳酸盐分解产生的CO_(2)比消石灰(生石灰消化形成)分解产生的H2O在焙烧过程中对球团内部结构造成的不利影响更大,因此生石灰作为熔剂性球团的钙质熔剂效果更好。研究内容可为生产熔剂性球团矿选择合适的钙质熔剂、碱度与焙烧温度等参数提供理论依据。In recent years,under the influence of environmental protection policies,the technology development of fluxed pellets has received widespread attention.Limestone and burnt lime were used as calcium fluxes,and influence law and action mechanism of flux type and flux addition amount on the compression strength of green pellets,preheated pellets and fired pellets were systematically studied.The experimental results show that,whether limestone or burnt lime is used,the compression strength of green pellets increases first and then decreases with the increase of basicity.When the basicity R=1.0,the compression strength is the highest.The compression strength of preheated pellets decreases with the increase of basicity.Prolonging the preheating time and increasing temperature can improve the compression strength of preheated pellets.When the roasting temperature is 1200℃,the compression strength of fired pellets decreases with the increase of basicity.The basicity increases from 0.06(no calcium flux,natural basicity)to 2.0,the compression strength of limestone pellets and burnt lime pellets decreases from 2212 N to 1070 N and 1010 N per pellet,respectively.When the roasting temperature is 1250℃,the compression strength of fired pellets increases first and then decreases with the increase of basicity,and reaches the peak when basicity R=0.5.Under the experimental conditions,the optimum basicity of fluxed pellets is R=0.5,the roasting temperature is 1250℃,and the roasting time is 20 min.Because the CO_(2) produced by the decomposition of carbonate has greater adverse effect on the internal structure of pellets than H2O produced by the decomposition of hydrated lime during roasting process of pellets,the effect of burnt lime as the calcium flux of fluxed pellets is better.The research content can provide theoretical basis for the selection of suitable calcium flux,basicity and roasting temperature parameters for the production of fluxed pellets.

关 键 词：钙质熔剂 熔剂性球团 碱度 抗压强度 显微结构 

分 类 号：TF046.6[冶金工程—冶金物理化学]