Method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles

Abstract

The invention relates to a method for recovering rare earth from low-concentration rare earth solution through prussian blue colloidal nanoparticles (PB-CNP). The method comprises the following steps: firstly synthesizing a stable PB-CNP colloidal solution, loading into a bag produced by a dialysis membrane, enabling a dialysis bag containing PB-CNP suspension to be in contact with rare earth material liquid (the pH value is 4-7), and enabling rare earth ions to pass through membrane holes to be in contact with the PB-CNP for being adsorbed. Dilute acid solution is used for desorbing the rareearth from the PB-CNP suspension which absorbs the rare earth ions, thereby achieving the purpose of recovering the rare earth. The PB-CNP suspension and the rare earth material liquid can also be arranged in different channels on the two sides of the membrane of a membrane component for flowing in a countercurrent way, thereby achieving the high-efficient enrichment effect. The method has the advantages of simple process, large rare earth loading amount, high rare earth recovery rate and the like, and can be widely used for the rare earth material liquid of rare earth mines and separation factories; and furthermore, by adopting the method, the rare earth ions in low-concentration rare earth wastewater can be completed removed and recovered, thereby having wide application prospects.

Description

Technical field: [0001] The invention belongs to the technical field of rare earth hydrometallurgy and wastewater treatment, and specifically relates to a method for recovering rare earths from rare earth solutions by using Prussian blue colloidal nanoparticles (PB-CNP) as an adsorbent. Background technique: [0002] Rare earth functional materials are widely used in high-tech industries, national defense, and aerospace technology. However, with the strengthening of the development of rare earth resources, the demand for rare earths increases, and the high-grade rare earth mines are decreasing. Therefore, the high-efficiency rare earth extraction technology for low-grade rare earth ores and the rare earth recovery technology in the low-concentration rare-earth wastewater generated in the rare-earth production process have received extensive attention in recent years, especially from the perspective of environmental and resource protection. Rare earth recovery technology in ...

AI Technical Summary

Problems solved by technology

The resin adsorption method is also relatively simple, but the loading capacity is small, the resin cost is high, and rare earth desorption is difficult

Although the extraction method has high efficiency and large enrichment factor, the ratio is too small, the loss of the extraction agent is large, the cost is high, and the problems of secondary pollution have not been completely solved.

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