Recovery of the Phosphorus from the Nitric Acid Extract of Powder Collected in a Bag Filter during the Recycling of Used Fluorescence Tubes

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  • Sugiyama Shigeru
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, The University of Tokushima
  • Kinoshita Haruka
    Department of Chemical Science and Technology, The University of Tokushima
  • Shinomiya Ippei
    Department of Chemical Science and Technology, The University of Tokushima
  • Kitora Ryuta
    Department of Chemical Science and Technology, The University of Tokushima
  • Nakagawa Keizo
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima Department of Resource Circulation Engineering, Center for Frontier Research of Engineering, The University of Tokushima
  • Katoh Masahiro
    Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima
  • Masumoto Kohei
    Japan Recycling Light Technology & System

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During the recovery of phosphorus from the powder collected in a bag filter during the recycling of used fluorescence tubes (bag-powder), the batch method with aqueous HNO3 was used to examine the elution behavior of aqueous phosphate contained in the bag-powder. The main components of the bag-powder included Ca2+, PO43− and Y3+ along with Si4+, Sr2+ and lanthanide cations such as La3+ and Ce4+. Therefore, it seemed possible that, with the selective dissolution of Ca2+ and PO43− from the bag-powder, these lanthanide cations in the residue could be enriched. With the batch method, most of the phosphate in the bag-powder was dissolved within 0.2 min using 1.0 mol/L HNO3. The dissolution behavior of calcium cation was similar to that of the phosphate. In contrast, the dissolution of yttrium, the content of which was the highest among the lanthanide cations in the bag-powder, was increased with the dissolution times, reaching complete dissolution after 24 h. The Sr2+, La3+ and Si4+ in the bag-powder, however, did not dissolve under the same conditions. Although Ca2+, PO43− and Y3+ were the main components in the nitric acid extract, Y3+ was separated as YPO4 at pH=4.0, while Ca2+ and PO43− were separated as calcium phosphates at pH=7.0. These results revealed that the separation of calcium phosphates, YPO4 and some residue was possible, and resulted in the enrichment of lanthanide cations along with the recovery of phosphorus from the bag-powder. Using the present technique, 91% of the P in the bag-powder was recovered.

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