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Correlation Evaluation of ion adsorption-Based rare earth Leaching Performance Based on Zeta Potential Drop Leaching

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Journal of Materials Science and Chemical Engineering 2023年第11期11卷 28-47页

作者： Xunhe Li Zhengxiong Ding Sengbiao Zeng Yanzhu Liu Dongping Li Yongxiu Li School of Chemistry and Chemical Engineering Nanchang University Nanchang China

rare earth elements are indispensable raw materials for advanced aero-engines, special optical materials, and high-performance electronic products. With the development of the social economy, the global demand for rare earth resources is increasing, and rare earths have become a key metal for the development of new industries and frontier technologies that are highly valued both at home and abroad. ion-adsorbed rare earth ores are an important source of rare earths, so the efficient green leaching of ion-adsorbed rare earths is important. Researchers found that the selection of an efficient green leaching agent for ion-adsorbed rare earths is based on the zeta potential of tailing clay minerals in addition to leaching efficiency, and both zeta potential and leaching ion concentration are related to mineral acidity and alkalinity, and the pH of tailing water suspension is a direct indicator of environmental water quality requirements. Therefore, the efficiency of the leaching process is closely integrated with the environmental evaluation, and the characteristics and correlation of the changes in zeta potential, pH, conductivity and pollutant concentration of the pulp of clay mineral content during the leaching process of ore leaching and tailings aqueous electrolyte solution leaching are studied by evaluating the leaching system, and a set of correlation leaching efficiency and environmental impact evaluation method is established based on the results of the above analysis, which is of scientific development of ion adsorption rare earth resources. It has important theoretical significance and practical application value.

关键词： ion adsorption rare earth Ph Value Zeta Potential the Leaching Efficiency

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A new generation of efficient green leaching technology for ion-adsorption rare earth

A new generation of efficient green leaching technology for ...

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中国化学会第十届全国无机化学学术会议

作者： Li Yongxiu Li hongyang Wang Dashan Wang Kang Liu Yanzhu Zhou Xuezhen Research Center for rare earths & Nano-micro Functional Materials Nanchang University

To overcome the serious water pollution and landslides that occur in response to in situ ion-adsorption rare earth(IARE) leaching, a new generation of efficient green leaching technology for ion-adsorption rare earth is proposed. The present presentation covers the contents including: Development history of IARE extraction technology;Classification and efficiency evaluation of IARE;Significance of high-efficiency green leaching IARE;A new generation of efficient green leaching reagents and new processes;Assessment of tailings landslide risk and leaching efficiency based on zeta potential determination;Linkage with the separation process;It was demonstrated that aluminum sulfate as a leaching agent of IARE not only has a high LE but also can reduce the amount of wastewater and risk of landslide.

关键词： ion adsorption rare earth Leaching Aluminum sulfate

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