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Patent Searching and Data


Title:
SEPARATION METHOD AND SEPARATION DEVICE FOR PHOSPHOR MIXTURE
Document Type and Number:
WIPO Patent Application WO/2012/118221
Kind Code:
A1
Abstract:
This separation method for a phosphor comprises: a step of bringing, into a treatment tube (100), a mixed solution (140) prepared by dispersing, into a dispersion medium, a mixture made of a plurality of types of phosphors of different magnetic susceptibilities, and of positioning, within the mixed solution, a filter (102) formed of a ferromagnetic material; a step of discharging and recovering the mixed solution from the treatment tube in a state where a magnetic field (130) has been applied to the filter; a step of cleaning the filter with dispersion medium and recovering the dispersion medium; and a step of cleaning the filter with dispersion medium in a state where the magnetic field has been reduced and recovering the dispersion medium. The dispersion medium is a solution in which a low-molecular-weight surfactant has been added to an aqueous solution of a high-molecular-weight dispersion agent. Each of the recovery steps is repeated using the recovered solution as a new mixture. Because a dispersion medium having high wettability is used on a fine-powder phosphor, the phosphor can be efficiently separated.

Inventors:
AKAI TOMOKO (JP)
YAMASHITA MASARU (JP)
OKI TATSUYA (JP)
Application Number:
PCT/JP2012/055530
Publication Date:
September 07, 2012
Filing Date:
March 05, 2012
Export Citation:
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Assignee:
NAT INST OF ADVANCED IND SCIEN (JP)
AKAI TOMOKO (JP)
YAMASHITA MASARU (JP)
OKI TATSUYA (JP)
International Classes:
C09K11/01; B03C1/00; B03C1/027; B03C1/029; B03C1/03; B03C1/032
Foreign References:
JP2010013626A2010-01-21
Other References:
TAKASHI HORIKAWA ET AL.: "Reuse and recycle processing for rare earth phosphors", MATERIALS INTEGRATION, vol. 24, no. 02, 1 February 2011 (2011-02-01), pages 37 - 43
TOMOKO AKAI: "Recent R&D for material technology of reducing or replacing rare earth elements in phosphor and recycling", FUNCTION & MATERIALS, vol. 31, no. 7, 5 June 2011 (2011-06-05), pages 25 - 30
Attorney, Agent or Firm:
SHIMIZU, SATOSHI (JP)
Spring water 敏 (JP)
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Claims: