Indium, germanium, gallium, rhenium, scandium, and other rare dispersed metals are indispensable key raw materials for strategic emerging industries such as new energy, semiconductors, aerospace, and advanced manufacturing. However, these metals are mostly associated with resources such as lead-zinc ores, bauxite, and coal ash. They typically occur in complex forms at extremely low grades—for example, the abundance of rhenium in the Earth's crust is only 10⁻⁹—and often coexist with large amounts of major metals and impurity ions. When dealing with such complex feed solutions, traditional solvent extraction processes generally face serious challenges, including low separation efficiency and difficulties in purification.

Bottlenecks of Traditional Extraction Processes

At present, the extraction of rare dispersed metals still widely relies on traditional equipment such as mixer-settlers, whose inherent limitations are becoming increasingly apparent:

• Slow phase separation: Relying on gravity settling, the separation of the two phases typically takes tens of minutes, severely limiting processing capacity.
• Prone to emulsification: In complex feed solution systems, the organic and aqueous phases can easily form stable emulsion layers, resulting in solution entrainment and material losses.
• Insufficient mass transfer efficiency: Limited mixing intensity makes it difficult to further improve the extraction rate of a single stage.
• High reagent consumption: Significant solvent entrainment leads to high operating costs.

These problems are particularly pronounced in rare dispersed metal systems characterized by complex compositions and low metal concentrations, seriously hindering pilot-scale testing and the optimization of industrial process parameters.

Technical Principle and Core Advantages of Centrifugal Extraction

The CWL-M Centrifugal Extractor utilizes the centrifugal force generated by high-speed rotation to achieve micron-scale mixing and mass transfer, as well as forced separation of the aqueous and organic phases, within seconds. Its core technological advantages are reflected in three key aspects:

1.Significantly enhanced mass transfer efficiency: Under the centrifugal force field, forced mixing breaks the liquid into micron-scale droplets, increasing the interfacial area for mass transfer by orders of magnitude. The single-stage extraction efficiency is significantly higher than that of traditional gravity-based equipment.

2.Second-level rapid phase separation: The powerful centrifugal force enables the two phases to separate clearly within seconds, fundamentally addressing emulsification problems and preventing the formation of a third phase.

3.Non-equilibrium selective extraction: By taking advantage of differences in the mass-transfer kinetics of different metal ions, the process enables highly selective extraction of target elements within an extremely short contact time, remaining effective even in the presence of large amounts of coexisting impurity ions.

Application Scenarios and Practical Results

In indium extraction processes, the CWL-M Centrifugal Extractor can be used for multi-stage counter-current extraction to consistently achieve high recovery rates and high-purity products, meeting the stringent requirements of high-end semiconductor applications and ITO targets.

For germanium extraction, traditional mixer-settlers are increasingly challenged by their large solution inventory, low separation efficiency, and severe emulsification. In contrast, centrifugal extractors can significantly improve separation efficiency through 4–6 stages of counter-current extraction, while substantially reducing organic-phase holdup and entrainment losses.

In pilot-scale rhenium extraction from spent acid, the centrifugal extractor has successfully produced high-purity ammonium perrhenate, demonstrating its reliability and stability in highly acidic systems with high impurity concentrations.

Conclusion

Rare dispersed metals are not a burden, but strategic resources that support the development of future technologies. With its core technologies of highly efficient mass transfer, second-level phase separation, and selective extraction, the CWL-M Centrifugal Extractor from Tiei Extraction is providing the global rare dispersed metal recovery industry with a more economical, stable, and sustainable solution. It can not only effectively address the extraction challenges associated with low-grade and complex systems, but also significantly reduce solvent consumption and operating costs, helping enterprises unlock high-value resources from materials that were once considered difficult to process.

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