造粒新方法:利用低品位矿石作为潜在原料

IF 2.5 3区 材料科学 Q3 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY
Dohyeon Kim, Byeongsoo Yoo, Leonardo Tomas da Rocha, Seongkyu Cho, Seongjin Kim, Sung-Mo Jung
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引用次数: 0

摘要

为实现碳中和,应减少烧结矿的使用,因为高炉烧结过程中二氧化碳排放量较高。这一趋势可能会促使人们更多地使用在制造过程中二氧化碳排放量较低、还原性较高以及因机械强度较高而具有气体渗透性的铁矿石球团。球团矿生产过程大多使用高品位铁矿石,如磁铁矿(Fe3O4)作为主要原料,但由于球团矿生产需求的不断增加,磁铁矿已经枯竭。本研究尝试用不同添加量(10、30、50 和 100 wt%)的低品位褐铁矿(Fe2O3∙nH2O)替代磁铁矿。褐铁矿含量的增加影响了球团矿孔隙率的增加,而孔隙率的增加是脱水的结果。通过孔隙率和孔径分布分析,可以阐明微观结构对还原前混合球团抗压强度的影响以及混合球团在氢气环境中的还原行为。褐铁矿与磁铁矿的结合促进了小尺寸孔隙的形成,进而显著增强了微观结构,褐铁矿混合球团的抗压强度与磁铁矿球团相当。鹅绿泥石相为氢渗透提供了途径,因此,褐铁矿混合球团在 H2 大气中的还原度达到 80%,与磁铁矿球团的还原度相似。混合球团在还原过程中的机械强度表明,它们具有在高炉操作中承受堆料层的潜力。这些研究结果表明了利用低品位铁矿球团工艺的潜力。 图文摘要通过球团给料优化提高高炉可持续性
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A New Approach of Pelletizing: Use of Low-Grade Ore as a Potential Raw Material

A New Approach of Pelletizing: Use of Low-Grade Ore as a Potential Raw Material

For carbon neutrality, the use of sinter should be decreased owing to higher CO2 emission in the sintering process of the blast furnace operations. This trend might contribute to the increased use of iron ore pellets with lower CO2 emission in the fabrication process, high reducibility and gas permeability due to higher mechanical strength. The pelletizing process mostly uses high-grade iron ore such as magnetite (Fe3O4) as the main raw material, which has been depleted due to the increasing demand for pellet production. The current study attempted to replace magnetite ore with low-grade limonite ore (Fe2O3∙nH2O) at different additional levels (10, 30, 50 and 100 wt%). The augmented limonite content influenced the increase in the porosity of pellets, which resulted from dehydration. The effect of microstructure on the compressive strength of mixed pellets before reduction and the reduction behavior of mixed pellets in a hydrogen atmosphere could be elucidated by porosity and pore size distribution analysis. The integration of limonite with magnetite facilitated the formation of small-sized pores, which in turn resulted in a significantly enhanced microstructure, with the limonite-mixed pellets demonstrating compressive strength comparable to that of magnetite pellets. The goethite phase provided a pathway for hydrogen permeability, and consequently, the reduction degree of limonite-mixed pellets in a H2 atmosphere amounted to a reduction degree of 80%, which is similar to that of magnetite pellets. The mechanical strength of mixed pellets during reduction suggests their potential to withstand the stack layer in blast furnace operations. These findings could suggest the potential to utilize low-grade iron ore pellet process.

Graphical Abstract

Enhancing blast furnace sustainability via pellet feed optimization

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来源期刊
Journal of Sustainable Metallurgy
Journal of Sustainable Metallurgy Materials Science-Metals and Alloys
CiteScore
4.00
自引率
12.50%
发文量
151
期刊介绍: Journal of Sustainable Metallurgy is dedicated to presenting metallurgical processes and related research aimed at improving the sustainability of metal-producing industries, with a particular emphasis on materials recovery, reuse, and recycling. Its editorial scope encompasses new techniques, as well as optimization of existing processes, including utilization, treatment, and management of metallurgically generated residues. Articles on non-technical barriers and drivers that can affect sustainability will also be considered.
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