Regenerating method and system for fluorescent material

Details Regenerating method and system for fluorescent material Regenerating method and system for fluorescent material

1998-02-06

2000-03-28

Lovering, Richard D.

Compositions

Inorganic luminescent compositions

Compositions containing halogen; e.g., halides and oxyhalides

134 60, 2523014R, 2523016S, 427 68, 427345, 516 89, C09K 1108, C09K 1156, B08B 1300

Patent

active

060427485

ABSTRACT:
A method for regenerating a fluorescent material from a recovered phosphor slurry characterized by including a chemical washing step wherein a hypochlorite and a periodate are used; a carbon removing step for floating carbon in the supernatant liquid by the use of ammonia thereby removing the carbon; an acid washing step; and a heat treating step in this order as well as a system for regenerating a fluorescent material comprising means for effecting the aforesaid steps. From this constitution, it becomes possible that impurities are easily and effectively removed from the recovered phosphor slurry, whereby a fluorescent material providing excellent luminance and excellent grade of phosphor film can be regenerated.

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patent: 4886082 (1989-12-01), Kato et al.
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patent: 5330791 (1994-07-01), Aihara et al.
patent: 5418005 (1995-05-01), Endo et al.
patent: 5435938 (1995-07-01), Bando et al.

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