PMC精粉配比对氧化球团质量的影响规律

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英文篇名：Law of influence of PMC concentrate proportion on quality of oxidized pellets 作者：邢宏伟 ; 魏福申 ; 田铁磊 ; 霍国杰 ; 李雅茹 英文作者：Xing Hongwei;Wei Fushen;Tian Tielei;Huo Guojie;Li Yaru;College of Metallurgy and Energy,North China University of Science and Technology;HBIS Group Tangsteel Company; 关键词：庙沟粉 ; PMC精粉 ; 氧化球团 ; 显微结构 ; 冶金性能 英文关键词：Miaogou powder;;PMC concentrate fines;;oxidized pellet;;microstructure;;metallurgical properties 中文刊名：SJQT 英文刊名：Sintering and Pelletizing 机构：华北理工大学冶金与能源学院;河钢集团唐钢公司; 出版日期：2018-12-15 出版单位：烧结球团 年：2018 期：v.43 基金：河北省科技计划项目(16214015);; 华北理工大学大学生创新创业训练计划项目(X2017107) 语种：中文; 页：SJQT201806016 页数：4 CN：06 ISSN：43-1133/TF 分类号：75-78

摘要

为了确定庙沟粉和PMC精粉两种矿粉造球的最佳配比,对庙沟粉、PMC精粉进行理化性能测定及颗粒形貌观察,并在此基础上对球团工艺试验进行了研究,分析了球团矿的显微形貌。结果表明:PMC精粉细颗粒含量较少,粒度较粗,且颗粒表面较粗糙,配加PMC精粉可以改善庙沟粉的成球特性;当PMC精粉配比为40%时,生球抗压强度及落下强度均达到最佳值,分别为10. 1 N/P及4. 8次/(0. 5 m),生球爆裂温度为500℃,球团矿抗压强度达到最大值3 283 N/P,且在此配比条件下生产的球团矿冶金性能能够满足球团生产要求;对PMC精粉配比为40%的球团矿进行显微形貌观察,发现球团矿中Fe_3O_4氧化充分,赤铁矿晶体发育完全,且赤铁矿晶体之间互连紧密成整体,显微结构比较致密,这表明配加PMC精粉改善了球团矿的显微结构,提高了球团矿的抗压强度。
        In order to determine the optimum ratio of the two kinds of iron ore concentrate fines Miaogou powder and PMC concentrate powder,the physical and chemical properties of the Miaogou powder and the PMC concentrate powder were measured and the particle morphology was observed. Based on this,a study about the pellet process test was conducted to analyze the microstructure of the pellets. The results show that the content of fine PMC concentrate fines is low,the granularity is coarse,and the surface of the particles is rough. Adding PMC concentrate fines can improve the balling properties of Miaogou powder.When the proportion of PMC concentrate fines is 40%,the compressive strength and drop strength of the green balls reach the best values,which are 10. 1 N/P and 4. 8 times/( 0. 5 m) respectively,and the bursting temperature of green balls is 500 ℃.The compressive strength of pellet reaches a maximum value of 3 283 N/P,and the metallurgical properties of the pellets produced under this condition can meet the requirements of the pellet production. The pellets produced with a proportion of 40%PMC concentrate fines were observed for microscopic morphology,and it was found that the Fe_3O_4 in the pellets was fully oxidized,the hematite crystals were fully developed,and the interconnections between the hematite crystals were tightly integrated and the microstructures were relatively dense,which indicates that the addition of PMC improves the microstructure of the pellets and the compressive strength of pellets.

引文

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