Simplified hydrometallurgical route for the synthesis of silica-free hematite from iron ore tailings

Almeida, Vítor Otacílio de; Lima, Neymayer Pereira; Schneider, Ivo

doi:10.1016/j.mineng.2023.108140

Cited by 8 publications

(1 citation statement)

References 40 publications

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“…Despite the research conducted on the secondary resource utilization of iron tailings, their comprehensive utilization rate remains low. Most studies have focused on separating the physical and chemical properties of iron tailings [38][39][40][41], overlooking their potential as a wave-absorbing material for microwave maintenance technology. Currently, there is a lack of research on the combination of iron tailings with asphalt pavements and microwave maintenance.…”

Section: Introductionmentioning

confidence: 99%

Temperature Field Characterization of Iron Tailings Based on Microwave Maintenance Technology

Xue,

Liu,

et al. 2024

Materials

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Microwave maintenance technology, as a new development trend, can realize the environmentally noninvasive and rapid repair of asphalt pavement and gradually replace traditional maintenance methods. Iron tailings were used as a self-healing material in this study to investigate the temperature response matching of microwave maintenance technology. Firstly, the physical properties and the mechanism of iron tailings were elaborated through macroscopic physical index testing and microscopic X-ray diffraction (XRD) analysis. Secondly, the applicability of aggregates to microwave heating was demonstrated by analyzing the temperature rise characteristics of the granules using infrared imaging. Then, the temperature field variation rules of the iron tailing asphalt mixture were summarized by microwave heating Marshall specimens. Finally, the road performance was assessed by conducting high-temperature dynamic stability, low-temperature tensile, water immersion Marshall, and freeze-thaw splitting tests. The experimental results showed that the iron tailings can be used as an aggregate for high-grade asphalt pavement and as the preferred aggregate for microwave maintenance technology. The iron tailings temperature field was radial from the inside out to provide different temperature response states for different pavement diseases, so the asphalt was dissolved and precipitated in a short time. The particle size of iron tailings was inversely proportional to the wave-absorbing heating rate, and the heating efficiency of the small particle size (0–4.75 mm) was the highest. The specimens doped with 4.75–13.2 mm iron tailings showed the best heating performance and road performance, with the average surface temperature of the specimens reaching 126.0 °C within 2 min. In summary, according to different disease types and construction needs, iron tailings can be used as an aggregate for asphalt pavement, providing an appropriate temperature field and improving the efficiency of the microwave maintenance of asphalt pavements.

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Section: Introductionmentioning

confidence: 99%

Temperature Field Characterization of Iron Tailings Based on Microwave Maintenance Technology

Xue,

Liu,

et al. 2024

Materials

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Optimization of hematite nanoparticles from natural ore as novel imaging agents: A Green Chemistry approach

Asha,

Chamundeeswari,

Flora

et al. 2024

Biotech and App Biochem

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In this research, we propose an environmentally friendly method for producing hematite nanoparticles (H‐NPs) from natural hematite ore, focusing on their application as efficient contrast agents in x‐ray and computed tomography (CT) imaging for medical purposes. The process involves the reduction of iron oxide within the ore to attain the desired hematite phase, crucial for synthesizing H‐NPs. To ensure sustainability, we adopted a Green Chemistry approach, utilizing a combination of carbon soot and limestone for the purification process, thereby achieving eco‐conscious production. The produced H‐NPs were thoroughly characterized using various analytical techniques, such as x‐ray fluorescence (XRF), x‐ray diffraction (XRD), Fourier transmission infrared spectroscopy (FT‐IR), and FESEM‐EDX (field emission scanning electron microscopy‐energy‐dispersive x‐ray spectroscopy). XRD analysis confirmed the crystalline rhombohedral hexagonal lattice structure, while FT‐IR spectra indicated the presence of characteristic Fe–O stretching modes in line with the expected molecular composition. FESEM‐EDX imaging unveiled agglomerated particles, ranging in size from 54.6 to 149.9 nm for iron ore and 22 nm for H‐NPs. These particles were primarily composed of iron (Fe) and oxygen (O). The magnetic properties of the H‐NPs were investigated through vibrating sample magnetometer (VSM) studies, highlighting their distinct ferromagnetic behavior. Of particular significance, the H‐NPs demonstrated exceptional performance as contrast agents in both x‐ray and CT imaging. Even at minimal concentrations, they exhibited remarkable x‐ray absorption capabilities. CT scans further validated their exceptional absorptive capacity. These findings emphasize the potential of H‐NPs as valuable assets in medical imaging, serving as sustainable tools for enhanced diagnostic applications. The study showcases an eco‐conscious approach to harnessing natural resources, paving the way for a greener and more effective utilization of H‐NPs in the medical imaging landscape.

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Comparing the Microstructural Changes of Mechanically Activated Hematite During Nano Zero-Valent Iron Preparation

Akhgar

2024

J. Sustain. Metall.

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Simplified hydrometallurgical route for the synthesis of silica-free hematite from iron ore tailings

Cited by 8 publications

References 40 publications

Temperature Field Characterization of Iron Tailings Based on Microwave Maintenance Technology

Temperature Field Characterization of Iron Tailings Based on Microwave Maintenance Technology

Optimization of hematite nanoparticles from natural ore as novel imaging agents: A Green Chemistry approach

Comparing the Microstructural Changes of Mechanically Activated Hematite During Nano Zero-Valent Iron Preparation

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