Leaching of rare earth elements from waste lamp phosphor mixtures by reduced alkali fusion followed by acid leaching

2016 ◽  
Vol 163 ◽  
pp. 99-103 ◽  
Author(s):  
Yong Liang ◽  
Yuanxin Liu ◽  
Rudan Lin ◽  
Doudou Guo ◽  
Chunfa Liao
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Alkali Fusion ◽  
Lamp Phosphor

scholarly journals Selective Extraction of Red Phosphor (Y2O3:Eu3+) Constituents from Waste Fluorescent Lamps Phosphor Using Acid Leaching

2018 ◽  
Vol 15 (3) ◽  
Author(s):  
Parul Johar ◽  
Vishal Jangir ◽  
Yogita Choudhary ◽  
Sudhanshu Mallick
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Xrd Analysis ◽  
Selective Extraction ◽  
Phosphor Powder ◽  
Red Phosphor ◽  
Fluorescent Lamps ◽  
Refinement Method ◽  
Lamp Phosphor

Modern fluorescent lamp phosphor powder contains tricolor phosphor. This tricolor phosphor consists of three different types of rare earth phosphors: red (YOX), green (CMAT/LAP) and blue (BAM); mixed in varying proportions. The exact separation of these three rare earth phosphors is essential in order to precisely recover the contained rare earth elements from waste lamps phosphor. In this present work, we reported an efficient methodology for the separation of these three tricolor phosphors and the selective extraction of predominantly presented red phosphor (YOX) constituents using acid leaching. The waste phosphor powder was leached with different acids: both organic and inorganic type. The 3 M H2SO4 leaching was found to be most suitable for the selective extraction of red phosphor constituents, i.e. Y and Eu. The recovered phosphor powder was analyzed with SEM/EDS and XRD analysis. The obtained XRD pattern was refined using Rietveld refinement method for the quantification of phases present. Recovered red phosphor powder contained three main crystalline phases Y2O3, Eu2O3 and Y2OS2. KEYWORDS: Waste Lamp Phosphor; Tricolor Phosphor; Rare Earth Elements; Acid Leaching

Extraction of Rare Earth Elements from Waste Trichromatic Fluorescent Phosphors

2013 ◽  
Vol 788 ◽  
pp. 279-282 ◽  
Author(s):  
Yu Feng Wu ◽  
Rui Qing Li ◽  
Qi Jun Zhang ◽  
Wei Wang
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Reaction Time ◽  
Rare Earth Elements ◽  
Spinel Structure ◽  
Weight Ratio ◽  
Acid Leaching ◽  
Red Phosphors ◽  
Alkali Fusion ◽  
Leaching Efficiency

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.

Study on extraction of rare earth elements from coal fly ash through alkali fusion – Acid leaching

2019 ◽  
Vol 136 ◽  
pp. 36-42 ◽  
Author(s):  
Mengcheng Tang ◽  
Changchun Zhou ◽  
Jinhe Pan ◽  
Ningning Zhang ◽  
Cheng Liu ◽  
...  
Keyword(s):  
Rare Earth ◽  
Fly Ash ◽  
Rare Earth Elements ◽  
Coal Fly Ash ◽  
Acid Leaching ◽  
Alkali Fusion

Process investigation of the acid leaching of rare earth elements from phosphogypsum using HCl, HNO3, and H2SO4

2016 ◽  
Vol 166 ◽  
pp. 195-204 ◽  
Author(s):  
Mugdha Walawalkar ◽  
Connie K. Nichol ◽  
Gisele Azimi
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching

Selective Nitric Acid Leaching of Rare-Earth Elements from Calcium and Phosphate in Fluorapatite Concentrate

JOM ◽  
2019 ◽  
Vol 71 (12) ◽  
pp. 4578-4587 ◽  
Author(s):  
Seyed Ramin Banihashemi ◽  
Bijan Taheri ◽  
Seyed Mohammad Razavian ◽  
Faraz Soltani
Keyword(s):  
Rare Earth ◽  
Nitric Acid ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Nitric Acid Leaching

scholarly journals Optimization of Acid Leaching of Rare-Earth Elements from Mongolian Apatite-Based Ore

Minerals ◽  
2016 ◽  
Vol 6 (3) ◽  
pp. 63 ◽  
Author(s):  
Rina Kim ◽  
Heechan Cho ◽  
Kenneth Han ◽  
Kihong Kim ◽  
Myoungwook Mun
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching

scholarly journals Acid leaching recovery and occurrence modes of rare earth elements (REEs) from natural kaolinites

2022 ◽  
Vol 175 ◽  
pp. 107278
Author(s):  
Bin Ji ◽  
Qi Li ◽  
Rick Honaker ◽  
Wencai Zhang
Keyword(s):  
Rare Earth ◽  
Rare Earth Elements ◽  
Acid Leaching

scholarly journals Sulfuric Acid Leaching of Heavy Rare Earth Elements (HREEs) from Indonesian Zircon Tailing

2020 ◽  
Vol 11 (4) ◽  
pp. 804
Author(s):  
Iga Trisnawati ◽  
Gyan Prameswara ◽  
Panut Mulyono ◽  
Agus Prasetya ◽  
Himawan Tri Bayu Murti Petrus
Keyword(s):  
Rare Earth ◽  
Sulfuric Acid ◽  
Rare Earth Elements ◽  
Acid Leaching ◽  
Sulfuric Acid Leaching ◽  
Heavy Rare Earth ◽  
Heavy Rare Earth Elements
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