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Dysprosium is sourced from rare earth-bearing minerals such as monazite, bastnäsite, and xenotime. These ores are extracted via mining (e.g., open-pit or underground), followed by crushing, grinding, and concentration techniques like flotation to isolate the rare-earth fraction.
The concentrated material undergoes acid baking—typically with sulfuric or hydrochloric acid—to break down the mineral matrix. This is followed by acid leaching to dissolve rare earth elements, allowing dysprosium to enter solution.
To isolate dysprosium from other rare earths, techniques such as solvent extraction (liquid-liquid extraction) or ion-exchange are used. These processes exploit subtle differences in chemical behavior among lanthanides to achieve high purity.
The purified dysprosium is chemically converted into a halide form—typically dysprosium fluoride (DyF₃) or chloride (DyCl₃)—which is suitable for metallothermal reduction.
The dysprosium halide is reduced using a reactive metal, most commonly calcium. The reaction occurs at high temperature (around 1,450 °C), producing metallic dysprosium and a stable salt (e.g., CaF₂) that separates upon cooling.
The crude metallic dysprosium is further purified by vacuum distillation or sublimation. This step helps remove residual impurities and any excess reducing agent, yielding high-purity dysprosium.
For ultra-high purity needs, additional refining techniques—such as vacuum melting or electron-beam melting—are applied. These processes remove trace contaminants and homogenize the metal for its intended applications.
