Extraction of Rare Earth Elements from Waste Trichromatic Fluorescent Phosphors

Abstract:

Two methods, direct acid leaching, alkali fusion and acid leaching, were adopted to deal with the Waste Trichromatic Fluorescent Phosphors (WTFPs). The research results showed that using the direct acid leaching method can only dissolved the Red phosphors. And yet, high-temperature alkali fusion could effectively destroy the Mg-Al spinel structure of the components of the Blue and the Green phosphors, and make REEs dissolved completely. The acid leaching efficiency of REEs could reach 100% when the weight ratio of NaOH with WTFPs is 6:1, and the calcination temperature is 900 °C and the reaction time is 4 hrs.

• Periodical: Advanced Materials Research (Volume 788)
• Pages: 279-282
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.788.279
• Online since: September 2013
• Authors: Yu Feng Wu, Rui Qing Li, Qi Jun Zhang, Wei Wang
• Keywords: Acid Leaching, Acid Leaching Efficiency, High-Temperature Alkali Fusion, Waste Trichromatic Fluorescent Phosphors

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