Method of recovering phosphor for picture tubes

Details Method of recovering phosphor for picture tubes Method of recovering phosphor for picture tubes

1991-01-11

1992-04-07

Jones, W. Gary

Liquid purification or separation

Processes

Using magnetic force

210774, 210785, 210804, 210806, 210906, 2523014R, B01D 2100, B01D 3303, C09K 1108

Patent

active

051025540

ABSTRACT:
In a method of recovering phosphor for picture tubes from phosphor sludge, the phosphor sludge is first subjected to a steam treatment, thereby causing substances adhering to the surface of the phosphor particles to pass into solution. The phosphor is then washed several times. Following wet screening, one then obtains a phosphor suspension that can be further processed just like virgin phosphor. The said method does not comprise any drying or calcining processes. The steam treatment causes the phosphor particles in the phosphor sludge to lose their tendency to cluster and form lumps, so that one obtains a high-yield suspension of very fine phosphor particles that can be further processed without any additional grinding or homogenization steps.

REFERENCES:
patent: 3649216 (1972-03-01), Hammond et al.
patent: 3864273 (1975-02-01), Forbes et al.
patent: 4306974 (1981-12-01), Harry
patent: 4492633 (1985-01-01), Sandulyak et al.

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