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Influence of pelletizing process parameters on the performance of V–Ti magnetite green pellets for composite agglomeration
Ironmaking & Steelmaking ( IF 2.1 ) Pub Date : 2021-08-17 , DOI: 10.1080/03019233.2021.1959873
Zhan-Guo Li 1 , Zheng-Jian Liu 1 , Jian-Liang Zhang 1 , Yao-Zu Wang 2, 3 , Li-Ming Ma 1 , Le-Le Niu 1 , Chen-Yang Xu 1 , Gui-Lin Wang 1
Affiliation  

ABSTRACT

To use vanadium–titanium magnetite (VTM) resources for sintering, a composite agglomeration process (CAP) is applied. This paper studies the effects of pelletizing parameters, including particle size, moisture content and bentonite content on VTM green pellets, composite agglomeration process and mineralogy. The experimental results show that the optimal pellets particle size, water and bentonite content are 5–8 mm, 8.75% and 2.0%, respectively, for the strength of VTM pellets. In the sintering process, the economic and technical indexes obtained by using VTM pellets based on CAP are significantly better than those obtained by traditional sintering process. When using CAP, VTM pellets with the particle size of 5–8 mm have more advantages in the air permeability of the feed layer compared with those with the particle size of 10–12 mm, and accordingly have higher sintering speed, yield, productivity and lower fuel consumption. The addition of 15% ordinary magnetite concentrates into VTM pellets did not improve the productivity, but it was helpful to reduce the solid fuel consumption. By analysing the mineral phase structure of sintering products under different schemes, it is found that the pellets are closely bound to the matrix in the CAP. The main phase in the pellet part is hematite phase, and a large amount of SFCA phase can be observed in the matrix part. When ordinary magnetite concentrate is added, the crystal connections within the particles become more complete.



中文翻译:

造粒工艺参数对复合团聚用钒钛磁铁矿生球团性能的影响

摘要

为了使用钒钛磁铁矿 (VTM) 资源进行烧结,应用了复合烧结工艺 (CAP)。本文研究了造粒参数,包括粒度、水分含量和膨润土含量对 VTM 生球团、复合团聚过程和矿物学的影响。实验结果表明,VTM 球团强度的最佳球团粒径、水和膨润土含量分别为 5-8 mm、8.75% 和 2.0%。在烧结过程中,使用基于CAP的VTM球团获得的经济技术指标明显优于传统烧结工艺。使用 CAP 时,粒径为 5-8 mm 的 VTM 颗粒比粒径为 10-12 mm 的颗粒在饲料层的透气性方面更具优势,因此具有更高的烧结速度、产量、生产率和更低的燃料消耗。在 VTM 球团中添加 15% 的普通磁铁精矿并没有提高生产率,但有助于降低固体燃料消耗。通过分析不同方案下烧结产品的矿物相结构,发现球团在CAP中与基体紧密结合。球团部分的主要相为赤铁矿相,基体部分可观察到大量的SFCA相。当加入普通磁铁精矿时,颗粒内的晶体连接变得更加完整。但它有助于减少固体燃料消耗。通过分析不同方案下烧结产品的矿物相结构,发现球团在CAP中与基体紧密结合。球团部分的主要相为赤铁矿相,基体部分可观察到大量的SFCA相。当加入普通磁铁精矿时,颗粒内的晶体连接变得更加完整。但它有助于减少固体燃料消耗。通过分析不同方案下烧结产品的矿物相结构,发现球团在CAP中与基体紧密结合。球团部分的主要相为赤铁矿相,基体部分可观察到大量的SFCA相。当加入普通磁铁精矿时,颗粒内的晶体连接变得更加完整。

更新日期:2021-08-17
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