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

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

C - Chemistry, Metallurgy

09

K

23/228, 23/82

C09K 11/01 (2006.01)

Patent

CA 1197662

Abstract of the Disclosure To a suspension of rare-earth phosphors and sulfidic or selenidic phos- phors there is added about 1 to 2% of the amount of hypohalide 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 hypo- halide has been added, to a pH value of preferably between 1.5 and 2, there is caused a sedimentation of elementary sulphur and/or selenium which becomes atta- ched to the sulfidic and/or selenidic phosphor solids, thus causing these phos- phor solids to sediment. The supernatant suspension containing the rare-earth phosphor is then decanted, and the rare-earth phosphor is reclaimed from the sus- pension. The disclosed reclaiming process is particularly suitable for decontam- inating phosphor mixtures as resulting in the course of manufacturing color tele- vision cathode-ray tubes.

413531

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