Efficient Preparation of Rare Earth Oxides from Back Extraction Praseodymium Neodymium Chloride by Flash Pyrolysis

Abstract

Praseodymium‐neodymium‐oxide powder was prepared using a simple citric acid‐assisted ultrasonic spray pyrolysis. The rare‐earth oxide transformation process and temperature were clarified using the characterisation results. The results show that a sufficient mass ratio of citric acid can promote the decomposition of chlorine oxides produced during calcination. This favourable change is attributed to the unique composition and morphology of the precursors. Furthermore, the residual chlorine content and migration behaviour in the praseodymium‐neodymium‐oxide powder were studied and discussed. This study provides the necessary theoretical and experimental basis for the application of ultrasonic spray pyrolysis technology for rare‐earth oxide production.

Structural Features, Emission Analysis, and Covalency Comparison of Neodymium Acylpyrazolone Complexes using Oscillator Strengths, Covalency and Judd‐Ofelt Parameters**

“…Among all the lanthanides, neodymium is known for forming alloys to make strong permanent magnets. Neodymium can be extracted using various techniques, including ion exchange, flash pyrolysis, [12] solvent extraction, [13] etc. Neodymium compounds and nanomaterials are known for anticandidal, [14] nano catalytic, [15] chemo selective, [15] optical limiting, [16] antibacterial, [17] wastewater treatment, [18] structural, optical, and electrical [19] activities.…”