Method for producing large diameter high purity sodium amalgam particles
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United States of America Patent
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Dec 6, 1983
Issued Date -
N/A
app pub date -
Nov 17, 1980
filing date -
Feb 2, 1976
priority date (Note) -
Expired
status (Latency Note)
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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.
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