Influence of Temperature Control System on the Crystallization Behavior of Magnetite Phases in Nickel Slags

Shen, Yuquan; Chen, Min; Zhang, Yanyun; Xu, Xiangyang; Li, Guozhou; Du, Xueyan

doi:10.1002/srin.201700300

Cited by 9 publications

(4 citation statements)

References 13 publications

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“…Nickel slag is produced during the nickel metallurgy process as industrial solid waste. The large amount of nickel slag in the environment is a serious problem, resulting from largescale occupation of farmland and causing secondary environmental pollution [13,14]. Thus, nickel slag utilization and recycling have recently attracted attention, with special focus on the extraction of valuable metallic elements and their reuse.…”

Section: Introductionmentioning

confidence: 99%

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Yan

Shen

et al. 2020

Materials

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The utilization of nickel slag has attracted much attention due to its high-content of valuable elements. As a part of these efforts, this work focuses on whether magnetite crystals, obtained from nickel slag via molten oxidation, magnetic separation, and ball-milling can be used as a microwave absorber. The composition, morphology, microstructure, magnetic properties, and microwave absorption performance were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), field emission scanning electron microscopy (FE-SEM), transmission electron microscopy (TEM), vibrating sample magnetometer (VSM), and vector network analysis (VNA). The results reveal that the magnetite crystals exhibit excellent microwave absorption properties because of the synergistic action between dielectric loss and magnetic loss. The minimum reflection loss (RL) of the particles obtained after 6 h ball-milling reaches −34.0 dB at 16.72 GHz with thickness of 5 mm. The effective frequency bandwidth (RL ≤ −10 dB) is 4.8–5.4 GHz and 15.9–17.6 GHz. Interfacial polarization of the particles could play a crucial role in improving absorbing properties because several components contained in the particles can dissipate electromagnetic wave effectively. The current study could show great potential in the preparation of magnetite crystals and utilization of nickel slag.

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Section: Introductionmentioning

confidence: 99%

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Yan

Shen

et al. 2020

Materials

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“…The iron resources in the nickel slag can be subsequently recovered by magnetic separation. 18,19) The morphology, precipitation and growth of magnetite are critical to the recovery of iron.…”

Section: Introductionmentioning

confidence: 99%

Precipitation Behavior of Magnetite Phase during Modified Nickel Slag Treated by Molten Oxidation

et al. 2023

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Nickel slag is a kind of solid waste with a high yield and low utilization rate.However, there is a large amount of Fe in nickel slag, which mainly exists in the form of fayalite.In this study, nickel slag is used as raw material. The addition of CaO can destroy the network structure of fayalite, and the iron-rich phase can be oxidized to magnetite under oxidation condition. It is beneficial to the recovery of iron resources. The effect of basicity on structural reconstruction of molten slag and precipitation of magnetite is investigated. The results show that when the basicity is 0.38~1.50, the degree of polymerization of silicate structure decreases with the increase of basicity. When the temperature is 1450~1500℃, viscosity of slag decreases first and then increases with the increase of basicity. The viscosity is the lowest with the basicity of 0.90, and the granular magnetite begins to precipitate during the non-equilibrium solidification at 1455℃. The growth rate of the magnetite is 1.20 μm/s at 0~10 s, which is significantly higher than the magnetite growth rate of 0.16 μm/s at 10~22 s, and the grain size of the magnetite remains unchanged after 22 s.

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“…With the smelting of nickel, the production of iron-rich metallurgical slag increases year by year， because that low nickel matte is produced by blowing oxygen in the Flash Furnace with separating nickel and iron from raw materials, leaveing a lot of Fe in molten slag. In the metallurgical slag of nickel, Fe mainly exists in the olivine phase including fayalite or hortonolite [3]. FeO is the main phase according to the molecular theory of slag at high temperature [4].…”

Section: Introductionmentioning

confidence: 99%

Effect of FeO content on melting characteristics and structure of nickel slag

Peng

et al. 2022

J min metall B Metall

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A great deal of nickel slag containing a lot of Fe in the form of FeO is produced in the process of nickel smelting. The effect of FeO content on the melting characteristics and structure of nickel slag is studied via thermodynamic calculation and experiments, with the nickel slag of water quenching furnace as raw material, which is simplified to CaO-SiO2-FeO-MgO slag system. The results are shown as follows: with the increasing of FeO content, the precipitated primary phase changes from melilite to olivine. The liquidus temperature, softening temperature, hemispheric temperature, flow temperature, viscosity and critical viscosity temperature of slag system tends to decrease gradually, but the solid phase temperature tends to decrease first and then increase. The centre of [SiO4]4- tetrahedron symmetric stretching vibration band in the slag system moves to the low wave number region. The mole fraction of O0 in the slag decreases continuously, the mole fraction of O- and O2- increases. The complex silicon-oxygen tetrahedron structure gradually disintegrates and the structural unit tends to be simple.

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Influence of Temperature Control System on the Crystallization Behavior of Magnetite Phases in Nickel Slags

Cited by 9 publications

References 13 publications

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Microwave Absorption Properties of Magnetite Particles Extracted from Nickel Slag

Precipitation Behavior of Magnetite Phase during Modified Nickel Slag Treated by Molten Oxidation

Effect of FeO content on melting characteristics and structure of nickel slag

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