In the pursuit of efficient use of resources and strategic material support today, the recovery of scandium, an important strategic material, from titanium dioxide mother liquor is not only a deep mining of resources, but also a strong support for the development of modern science and technology. Scandium is widely used in aerospace, superconductivity, nuclear technology and other frontier fields, and the preparation of its high-purity products is particularly critical. In order to achieve this goal, the use of combined extraction centrifugal extractor for high efficiency extraction and separation has become the preferred solution in this field.

In the recovery process, it is first necessary to add inhibitors to the mother liquor of titanium dioxide to accurately regulate the extraction behavior of P204 on impurities such as iron and titanium, and avoid its interference with scandium recovery. Subsequently, the multi-stage extraction operation is carried out by the combined extraction centrifugal extractor. With its excellent separation efficiency and stability, the initial separation of scandium and titanium, iron and other impurities is effectively realized. In this stage, the combined extraction centrifugal extractor accelerates the mass transfer and phase separation in the extraction process through its unique centrifugal force field, and improves the extraction efficiency and purity.

After the extraction is completed, the supported organic phase needs to be further treated to remove residual impurity ions such as titanium and iron. In this step, mixed acid or sulfuric acid is used as the washing liquid, and the organic phase is deeply purified through the multi-stage washing section of the combined extraction centrifugal extractor. During the washing process, the combined extraction centrifugal extraction machine ensures the full contact and efficient separation of the washing liquid and the organic phase, effectively removing impurities, and laying a solid foundation for the subsequent scandium stripping.

Next, scandium in the washed organic phase is reversed extracted, and scandium is transferred to the water phase with appropriate extractor through the reverse extraction section of the combined extraction centrifugal extractor. In this process, the combined extraction centrifugal extractor once again gives full play to its advantages of efficient phase separation, ensuring efficient recovery of scandium and further improvement of purity.

The scandium solution after back-extraction was treated by oxalic acid precipitation, burning and other steps, and finally the crude scandium oxide was obtained. After further refining process, Sc2O3 products with purity ≥98% can be obtained. In the entire recovery process, the application of the combined extraction centrifugal extractor not only improves the recovery rate and purity of scandium, but also simplifies the operation process, reduces the production cost, and shows its strong strength and wide application prospects in the separation of complex systems.