Method of reclaiming phosphor

Details Method of reclaiming phosphor Method of reclaiming phosphor

1993-04-16

1994-07-19

Cooper, Jack

Coating processes

Particles, flakes, or granules coated or encapsulated

Inorganic base

2523014R, 2523014S, 2523016S, 427 64, 427 68, C09K 1101

Patent

active

053307917

ABSTRACT:
A method of reclaiming a phosphor from a recovered phosphor slurry containing carbon, a bichromate, and polyvinyl alcohol, comprises, (a) a decomposition treatment step of adding an alkali to the recovered phosphor slurry after the slurry is heated to prepare a phosphor suspension having an alkali concentration of 0.5N or less in the slurry, and adding an oxidizing agent in an amount of 1.0 to 20.0 wt % with respect to a dry solid component of the suspension, (b) a weak acid treatment step of separating a phosphor from the suspension, and adding a weak acid to a suspension obtained by adding water to the separated phosphor, thereby adjusting a pH to be 3.0 to 5.0, and (c) a surface treatment step of treating the surface of the phosphor separated from the suspension.

REFERENCES:
patent: 3647522 (1972-03-01), Single
patent: 3763050 (1973-10-01), Dikhoff et al.
Patent Abstracts of Japan vol. 4, No. 151 (C-028) Oct. 23, 1980 & JP-A-55 094 986 (Hitachi Ltd) Jul. 1980.
Patent Abstracts of Japan, vol. 2, No. 51 (F-026) Apr. 12, 1978 & JP-A-53 015 032 (Tokyo Sshsibaura Elec. Ltd) May 22, 1978.
Patent Abstracts of Japan vol. 2, No. 59 (C-012) Apr. 27, 1978 & JP-A-53 018 489 (Hitachi Ltd) Feb. 20, 1978.
Patent Abstracts of Japan vol. 6, No. 226 (E-141) [1104], Nov. 11, 1982 & JP-A-57 130 337 (Tokyo Shibaura Denki K.K.) Aug. 12, 1982.
Patent Abstracts of Japan, vol. 5, No. 41 (C-047), Mar. 18, 1981 & JP-A-55 164 283 (Nichia Kagaku Kogyo) Dec. 21, 1980.

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