Synthesis and characterization of NEODYMIUM PHOSPHATE (cas 14298-32-9) powder resulted from neodymium loaded-HDEHP organic solutions by a stripping–precipitation process using a Lewis type cell

Add time:07/24/2019    Source:sciencedirect.com

The solvent extraction process of neodymium(III) from aqueous solution by di(2-ethylhexyl) phosphoric acid (HDEHP) in kerosene has been performed as a first step to accomplish the homogeneous precipitation of NEODYMIUM PHOSPHATE (cas 14298-32-9) by stripping from an organic metal loaded HDEHP solution using phosphoric acid solutions. In this study, stripping–precipitation approach was proposed to synthesize powders of neodymium phosphate using a modified Lewis cell. The effects of extractant, organic phase, neodymium concentration, stripping phase, phosphoric acid content and temperature were separately investigated. The neodymium precipitate was characterized by X-ray diffractometry, scanning electron microscopy, particle size measurement, thermogravimetric analysis and infrared spectroscopy. The results showed that the powder precipitated with 3 M H3PO4 showed more regular and slightly larger particles than those obtained by 5 M H3PO4 while the precipitate with 8 M H3PO4 gave highly agglomerated particles. Increasing the HDEHP concentration from 0.25 M to 0.75 M gave an increase of the particle size of the precipitate. As the temperature increases (10–45 °C), the formed particles appeared to be more crystalline and smaller in size.

► Pre-extracted neodymium was stripped from an organic loaded HDEHP solution using phosphoric acid solutions. ► Stripping–precipitation approach was proposed to synthesize powders of neodymium phosphate. ► The powder precipitated with 3 M H3PO4 showed more regular particles and slightly larger than those obtained by 5 M H3PO4. ► Increasing the HDEHP concentration gave an increase of the particle size of the precipitate.

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