Method for recycling lanthanum and cerium rare earth metals in water by using metal organic framework

The one-step rare earth recovery method using ZIF-67 material solves the problems of complex processes and high energy consumption in existing technologies, achieving efficient and low-cost rare earth recovery, especially with excellent cerium extraction performance under acidic conditions.

CN122445974APending Publication Date: 2026-07-24BEIJING NORMAL UNIV AT ZHUHAI
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BEIJING NORMAL UNIV AT ZHUHAI
Filing Date
2026-06-26
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing rare earth recovery technologies are cumbersome, energy-intensive, and have poor selectivity, making it difficult to effectively recover lanthanum and cerium rare earth metals from water, especially in complex aquatic environments where extraction is ineffective.

Method used

Using zeolite imidazole ester framework material ZIF-67 as an adsorbent, it reacts with rare earth solution at room temperature in a one-step reaction to generate rare earth oxides, hydroxides or carbonate crystals, avoiding desorption and calcination steps.

Benefits of technology

It achieves efficient and environmentally friendly rare earth recycling, with high product purity and good selectivity, and is suitable for the treatment of rare earth wastewater with various pH values, reducing operating costs and the generation of waste residue and waste liquid.

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Abstract

The application discloses a method for recycling lanthanum and cerium rare earth metals in water by using a metal organic framework. The method utilizes the strong coordination affinity between the rich imidazole nitrogen active sites in the ZIF-67 material framework and rare earth ions, and a coupling mechanism of adsorption-framework dissociation-phase transformation of ZIF-67 induced by rare earth ions, to realize one-step efficient and selective recovery of La 3+ and Ce 3+ in water and in-situ crystal phase conversion. The recycling method of the application realizes efficient recovery of La 3+ and Ce 3+ , and is more comprehensive in rare earth recycling types and better in pH adaptability, and is especially suitable for acid wastewater treatment, breaks the bottleneck that products are difficult to collect under acidic conditions in the prior art, and can directly treat typical acid smelting wastewater without pre-neutralization treatment.
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