Study on the Preparation of Large-Particle Anhydrous Pr-Nd Fluoride with Moderate Apparent Density by Hydrofluoric Acid Preparation Method AITranslate

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Chinese Library Classification Number:TQ133.3[化学工程—无机化工]

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Anhydrous Pr-Nd fluoride powder was prepared by hydrofluoric acid precipitation,and the effects of oxalic acid addition,bottom water acidity,supernatant recycling times and hydrofluoric acid dosage on the formation of hydrated Pr-Nd fluoride crystal and the morphology,particle size,apparent density and impurities of anhydrous Pr-Nd fluoride powder were investigated.The results show that the optimized process conditions are as follows:oxalic acid addition at 6%~10%of the theoretical amount(1.5 times the molar amount of RE³⁺),bottom water acidity of 1.6~2.0 mol/L,supernatant recycling up to 3 times,and hydrofluoric acid dosage at 100%of the theoretical amount(3 times the molar amount of RE³⁺).The anhydrous Pr-Nd fluoride powder prepared under these optimized process conditions has a median particle size D₅₀of 10~30μm and an apparent density of 0.7~0.8 g/cm³.The content of non-rare earth impurities is low,and the yield rate of rare earth reaches 99.81%.