Process for reclaiming rare-earth metallic oxide and/or rare-ear

Details Process for reclaiming rare-earth metallic oxide and/or rare-ear Process for reclaiming rare-earth metallic oxide and/or rare-ear

1982-10-06

1984-09-25

Cooper, Jack

Compositions

Inorganic luminescent compositions

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

2523014S, 2523016S, 423 211, 423263, C09K 1146

Patent

active

044734883

ABSTRACT:
To a suspension of rare-earth phosphors and sulfidic or selenidic phosphors there is added about 1 to 2% of the amount of hypohalogenite which would be necessary to convert the entire sulfidic or selenidic chalcogenide phosphor into a soluble sulfate and/or selenate. When acidifying the dispersion to which hypohalgenite has been added, to a pH value of preferably between 1.5 and 2, a sedimentation of elementary sulphur and/or selenium forms and becomes attached to the sulfidic and/or selenidic phosphor solids, thus causing these phosphor solids to form sediment. The supernatant suspension containing the rare-earth phosphor is then decanted, and the rare-earth phosphor is reclaimed from the suspension.
The disclosed reclaiming process is particularly suitable for decontaminating phosphor mixtures for use in manufacturing color television cathode-ray tubes.

REFERENCES:
patent: 2796331 (1957-06-01), Kauffman et al.
patent: 3378345 (1968-04-01), Bourdeau et al.
patent: 3664813 (1972-05-01), Hollander
patent: 3763050 (1973-10-01), Dikhoff
patent: 3864273 (1975-02-01), Forbes et al.
patent: 3941714 (1976-03-01), Mathers
patent: 4014980 (1977-03-01), Fujimaki et al.
patent: 4391787 (1983-07-01), Tibbetts
Oberlin et al., J. Of Crystal Growth, V 32, pp. 335-349 (1976).
Koyama et al., Japanese Journal of Applied Physics, vol. 11, No. 4 (Apr. 1972) pp. 445-449.
Katsuki et al., Carbon, vol. 19, pp. 148-150, (1981).

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