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南非PMC钒钛精矿基础性能及对烧结过程的影响
王天雄1,2, 丁成义1, 赵伟2, 游志雄1
1.重庆大学 材料科学与工程学院, 重庆 400044;2.重庆钢铁股份有限公司, 重庆 401258
摘要:
本研究的目的是在查明南非PMC钒钛磁铁精矿物化性能基础上,研究配加PMC精矿对烧结产质量指标的影响。通过化学分析、X射线衍射分析、激光粒度分析、扫描电镜能谱分析等,分别研究了PMC精矿的化学成分、物相组成、粒度分布和颗粒形貌;进而采用烧结杯试验,考查了配加PMC精矿后利用系数、固体燃耗、转鼓指数等主要技术经济指标的变化规律,并结合烧结矿微观结构,揭示了PMC精矿对烧结过程的影响机制。研究表明,PMC钒钛磁铁矿铁含量高达63.46%,脉石含量较低,具有较高的利用价值;其物相主要为磁铁矿,粒度较细;配加10% PMC精矿后恶化了烧结过程,利用系数、转鼓指数均明显降低,固体燃耗上升。其原因主要是PMC精矿烧结性能较差,烧结过程液相生成不足,影响了烧结矿强度,且钙钛矿的生成破坏了液相的粘结作用和烧结矿良好的微观结构。
关键词:  PMC精矿  基础性能  烧结  微观结构
DOI:10.11835/j.issn.1000-582X.2019.08.007
分类号:TD981
基金项目:国家重点研发计划资助项目(2018YFC1900500)。
Basic properties and sintering performance of PMC vanadium titanium concentrate of South Africa
WANG Tianxiong1,2, DING Chengyi1, ZHAO Wei2, YOU Zhixiong1
1.School of Materials Science and Engineering, Chongqing University, Chongqing 400044, P. R. China;2.Chongqing Iron & Steel(Group) Co. Ltd., Chongqing 401258, P. R. China
Abstract:
The purpose of this paper is to study the physicochemical properties of PMC vanadium-titanium magnetite in South Africa, and reveal the effect of PMC concentrate on the sintering performances. The chemical and phase composition, size distribution and particle morphology were investigated by chemical analysis, XRD, LPSA and SEM-EDS, respectively. After that, sintering pot experiments were carried out to study the effect of PMC concentrate on the utilization factor, tumbler index and solid fuel consumption. The mechanism was clarified by investigating the microstructure of finished sinter. The results reveal that the iron content is as high as 63.460% while gangue content is low, which is of great value to the utilization. The main phase is magnetite and the fraction of particles not smaller than 74 μm is close to 70%. The sintering pot test shows that the utilization and strength is deteriorated obviously after adding 10% PMC concentrate, and the solid fuel consumption increased correspondingly. This is mainly attributed to the relative poor sintering performance of PMC concentrate, which affects the generation of liquid phase during sintering process. As a result, the strength of finished sinter is influenced. Worse still, the formation of perovskite destroys the bonding effect of the liquid phase as well as the microstructure of sinter.
Key words:  PMC concentrate  basic properties  sintering  microstructure
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