Abstract
Magnetization roasting followed by magnetic separation is considered an effective method for recovering iron minerals. As hematite and magnetite are the main concomitant constituents in iron ores, the separation index after the magnetization roasting will be more optimized than with only hematite. In this research, the mechanism of the original magnetite improving iron ore reduction during the magnetization roasting process was explored using ore fines and lump ore samples. Under optimum roasting conditions, the iron grade increased from 62.17% to 65.22%, and iron recovery increased from 84.02% to 92.02% after separation, when Fe in the original magnetite content increased from 0.31% to 8.09%, although the Fe masses in each sample were equal. For lump ores with magnetite and hematite intergrowth, the method of in situ and continuous image capture for microcrack generation and the evolution of the magnetization roasting process was innovatively examined with a laser scanning confocal microscope (LSCM) with confocal technology and 3D morphologic technology for the first time. The naturally uneven areas, protogenetic pore edges, and magnetite and hematite edges provided active sites for reduction reactions. The microcracks gradually evolved from the lump ore surface and the edges of magnetite and hematite, which had a direct connection with the efficient improvement in ore reduction.
Highlights
Published: 17 June 2021In industrial manufacturing, steel is an indispensable raw material
All iron ore samples used in this research were obtained from raw materials f Qidashan dressing plant located in Liaoning Province, China
2O3, CaO, MgO, iron oreThe samples used in research were obtained from from the etc., w
Summary
Steel production is used to measure the national strength and industrial level of a country [1,2]. Steel production demand has increased rapidly and steadily around the world. The highest-quality iron ore resources have been exploited, and reserves are insufficient. Refractory low-grade and fine particle iron ores have gradually become the main raw materials for the steel industry [3,4]. These refractory iron ores pose considerable challenges for conventional beneficiation methods [5,6,7,8,9]
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.