Pr โลหะพรสิโอไดเมียม 99.99% สารเติมแต่งหลักในโลหะผสมพิเศษ หินเหล็กไฟ สารเพิ่มนอดูล

Praseodymium (Pr): Essential for NdFeB Magnetic Materials, Key Additive in Specialty Alloys (Flints, Nodulizers)

Praseodymium (Pr) is a gray active metal with a density of 6.64g/cm³ (tetragonal crystal), melting point of 935°C, boiling point of 3290°C, and is malleable. Praseodymium has stronger corrosion resistance in air than La, cerium, neodymium and europium, but exposure to air will produce a brittle green oxide layer. Pure praseodymium must be stored in mineral oil or sealed plastic.

1. Praseodymium metal is mainly used in NdFeB magnetic materials.
2. Indirectly added in manufacturing special alloys [lighter flints, nodulizers, etc.]

• Standard packaging: 50 kg/drum, 500 kg/pallet, ton bags
• Sample packaging: 500 g/bag, 1 kg/bottle

Praseodymium is separated from other rare earth elements through ion exchange or solvent extraction technology, then prepared by metallothermic reduction. Lithium reduction of rare earth chlorides differs from calcium reduction - the former's reduction process occurs in the gas phase.

The lithium reduction reactor has two heating zones, combining reduction and distillation in one device. Anhydrous praseodymium chloride is placed in the upper titanium crucible (also serving as PrCl₃ distillation chamber), while lithium metal reductant is placed in the lower crucible. The stainless steel reaction vessel is evacuated to 7Pa before heating.

When temperature reaches 1000°C, maintain for sufficient time to allow complete reaction between PrCl₃ vapor and lithium vapor. The reduced praseodymium metal solid particles fall into the lower crucible. After completion, only heat the lower crucible to distill LiCl to the upper crucible. The reduction process typically takes about 10 hours.

To obtain higher purity praseodymium :

• Use 99.97% high-purity lithium reductant
• Use twice-distilled anhydrous PrCl₃