Plastic and nonmetallic article shaping or treating: processes – Formation of solid particulate material directly from molten... – By vibration or agitation
Patent
1980-11-17
1983-12-06
Hall, James R.
Plastic and nonmetallic article shaping or treating: processes
Formation of solid particulate material directly from molten...
By vibration or agitation
264 14, B01J 204
Patent
active
044193033
ABSTRACT:
Substantially pure, free flowing, sodium amalgam particles of predetermined composition and controlled particle size are prepared for use as vaporizable fill for high pressure discharge lamp devices, whereby accurately measurable quantities of the sodium amalgam may be introduced into the lamp devices. A process for producing the substantially pure amalgam particles of accurately controlled size includes heating a mixture of sodium and mercury to form a melt, passing the melt through a vibrating discharge nozzle and subjecting the droplets so formed to an inert cooling fluid maintained at a temperature below the solidification point of the amalgam. An apparatus for producing the amalgam particles comprises a vessel to contain an alkali metal amalgam melt, a virbrating discharge nozzle adatped to form the melt into uniformly sized droplets, and a column of inert cooling fluid maintained at a low temperature at which the melt droplets are solidified. Where spheres in the range of 500-1400 microns are desired, the velocity of the melt exiting the nozzle may be reduced to approximately zero and an updraft in the coding fluid provided to assist quenching.
REFERENCES:
patent: 4216178 (1980-08-01), Anderson
Hall James R.
Rogers, III L. Lawton
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