Solid-Solid Separation of Fluorescent Powders by Liquid-Liquid Extraction Using Aqueous and Organic Phases

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概要

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• Two-step liquid-liquid extraction methods using aqueous and organic phases for separation of red (Y2O3: Eu3+), blue (BaMgAl10O17: Eu2+) and green (CeMgAl10O17: Tb3+) fine fluorescent powders were proposed in this paper. At first, the blue powder was extracted selectively into heptane phase using a chelating agent, 2-thenoyltrifluoroacetone (HTTA, CF3COCH2COC4H3S) under alkaline pH condition. Then, chloroform was used for extracting the green powder into the chloroform phase. The red powder separating from the green powder remained in aqueous phase with a depressant, potassium sodium tartrate tetrahydrate (PST, KNaC4H4O6·4H2O). The powders could be well separated in terms of their grade and recovery. The results suggested directions for future research into the recycling of fluorescent powders from fluorescent lights.

• 環境資源工学会の論文

著者

• SHIBAYAMA Atsushi

  Department of Chemical Science, Graduate School of Natural Science and Technology, Kanazawa Universi

• Fujita Toyohisa

  Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo

• SADAKI Jun

  Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo

• OTSUKI Akira

  Department of Geosystem Engineering, Graduate School of Engineering, The University of Tokyo

• MEI Guangjun

  College of Chemistry and Chemical Engineering, Central South University

• JIANG Yuren

  College of Chemistry and Chemical Engineering, Central South University

• MATSUDA Mitsuaki

  Institute for Mining Research and Studies

• Shibayama Atsushi

  Department Of Chemical Science Graduate School Of Natural Science And Technology Kanazawa University

• Fujita Toyohisa

  Department Of Geosciences Mining Engineering And Materials Processing Akita University

• Shibayama Atsushi

  Department Of Biochemical And Chemical Engineering Faculty Of Engineering Gunma University

• SHIBAYAMA Atsushi

  Department of Materials-process Engineering and Applied Chemistry for Environments, Faculty of Engineering and Resource Sciences, Akita University

• Otsuki Akira

  Department of Chemistry and Physics, National Institute for Environmental Studies

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