Method for separating sulfide phosphor particles from...

Details Method for separating sulfide phosphor particles from... Method for separating sulfide phosphor particles from...

C - Chemistry, Metallurgy

09

K

31/115, 361/6

C09K 11/77 (2006.01) C09K 11/01 (2006.01)

Patent

CA 1039046

ABSTRACT OF THE DISCLOSURE To separate chemically-oxidizable sulfide phosphor particles, such as zinc sulfide and zinc-cadmium sulfide phosphor particles, from a mixture with essentially non- oxidizable phosphor particles, produce an aqueous slurry containing the mixture of particles, about 1 to 10 weight- percent mineral acid, and about 1 to 5 weight-percent alkali nitrite. The acid and nitrite react with the oxidizable phosphor particles producing gas bubbles, which cause the oxidizable particles to rise and to float on the surface of the slurry. The floated particles are removed by decanta- tion, skimming, or other technique.

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