Dohyeon Kim, Byeongsoo Yoo, Leonardo Tomas da Rocha, Seongkyu Cho, Seongjin Kim, Sung-Mo Jung
{"title":"造粒新方法:利用低品位矿石作为潜在原料","authors":"Dohyeon Kim, Byeongsoo Yoo, Leonardo Tomas da Rocha, Seongkyu Cho, Seongjin Kim, Sung-Mo Jung","doi":"10.1007/s40831-024-00921-3","DOIUrl":null,"url":null,"abstract":"<p>For carbon neutrality, the use of sinter should be decreased owing to higher CO<sub>2</sub> emission in the sintering process of the blast furnace operations. This trend might contribute to the increased use of iron ore pellets with lower CO<sub>2</sub> 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 (Fe<sub>3</sub>O<sub>4</sub>) 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 (Fe<sub>2</sub>O<sub>3</sub>∙nH<sub>2</sub>O) 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 H<sub>2</sub> 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.</p><h3 data-test=\"abstract-sub-heading\">Graphical Abstract</h3><p>Enhancing blast furnace sustainability via pellet feed optimization</p>\n","PeriodicalId":17160,"journal":{"name":"Journal of Sustainable Metallurgy","volume":null,"pages":null},"PeriodicalIF":2.5000,"publicationDate":"2024-09-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"A New Approach of Pelletizing: Use of Low-Grade Ore as a Potential Raw Material\",\"authors\":\"Dohyeon Kim, Byeongsoo Yoo, Leonardo Tomas da Rocha, Seongkyu Cho, Seongjin Kim, Sung-Mo Jung\",\"doi\":\"10.1007/s40831-024-00921-3\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<p>For carbon neutrality, the use of sinter should be decreased owing to higher CO<sub>2</sub> emission in the sintering process of the blast furnace operations. This trend might contribute to the increased use of iron ore pellets with lower CO<sub>2</sub> 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 (Fe<sub>3</sub>O<sub>4</sub>) 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 (Fe<sub>2</sub>O<sub>3</sub>∙nH<sub>2</sub>O) 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 H<sub>2</sub> 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. 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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
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.