Insight into the mechanism on co-leaching of REEs and Fe from NdFeB sludge: Elucidating phase transformation and co-leaching kinetics

• Autorzy: Li Xinglan , Liu Zishuai , Liu Xiu , Tang Xuekun , Lin Huiyang , Yao Lushuai , Bai Wanting , Guo Jiangfeng

Identyfikatory

DOI

10.37190/ppmp/189908

• Języki publikacji: EN

Abstrakty

EN

The NdFeB sludge is a secondary rare earth resource abundant in both REEs and Fe elements. However, there tends to be a focus on recovering only high-value rare earths while neglecting the recycling of high-content iron, leading to a low comprehensive utilization of this secondary rare earth resource. The present study builds upon previous research on the separation and coextraction of REEs and Fe from NdFeB sludge, further investigating the phase transformation behavior during oxidation roasting and elucidating the kinetics of simultaneous leaching of REEs and Fe. The results suggest that NdFeB waste exhibited a loose morphology and demonstrated high susceptibility to dissolution in hydrochloric acid when subjected to roasting temperatures below 500℃. The morphology of NdFeB waste becomes denser and more spherical, hindering its dissolution in hydrochloric acid when the roasting temperature exceeded 500C, resulting in a reduction in the leaching efficiencies of both roasting. The co-leaching of REEs and Fe in NdFeB sludge is governed by internal diffusion for REEs and chemical reaction for Fe, as evidenced by the kinetic results. Furthermore, it is observed that the apparent activation energy of rare earth surpasses that of iron, leading to the attainment of equilibrium for rare earth prior to that of iron during the synchronous leaching process. The findings of this study hold theoretical significance in enhancing the overall efficiency of secondary rare earth resource utilization.

Słowa kluczowe

EN

NdFeB sludge; rare earth; iron; phase transformation; co-leaching kinetics

• Wydawca: Oficyna Wydawnicza Politechniki Wrocławskiej
• Czasopismo: Physicochemical Problems of Mineral Processing
• Rocznik: 2024
• Tom: Vol. 60, iss. 3
• Strony: art. no. 189908
• Opis fizyczny: Bibliogr. 30 poz., ry., tab., wykr.

Twórcy

autor

Li Xinglan

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Liu Zishuai

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Liu Xiu

• Chinalco Environmental Protection and Energy Conservation Group Co., Ltd., Beijing 101300, China

autor

Tang Xuekun

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Lin Huiyang

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Yao Lushuai

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Bai Wanting

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

autor

Guo Jiangfeng

• Jiangxi Provincial Key Laboratory of Environmental Pollution Prevention and Control in Mining and Metallurgy, Jiangxi University of Science and Technology, Ganzhou 341000, China
• Key Laboratory of Testing and Tracing of Rare Earth Products for State Market Regulation, Jiangxi University of Science and Technology, Ganzhou 341000, China

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