Spheroidal slag and fly ash particles and apparatus and process for producing same
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United States of America Patent
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Jun 8, 2004
Grant Date -
Feb 28, 2002
app pub date -
May 30, 2001
filing date -
Jan 30, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The present invention provides spheroidal particles of coal slag, and methods of making the spheroidal particles. One method of the invention includes delivering a feedstock of irregularly shaped particles of coal fly ash or coal slag to a drop tube, dropping the irregularly shaped particles into the drop tube in a manner such that the irregularly shaped particles flow in a substantially vertical downward path as individualized particles, and heating the irregularly shaped particles to cause at least the outer surface of the irregularly shaped particles to melt and form spheroidal particles due to surface tension at the outer surface. The spheroidal particles typically have a diameter in the range of about 0.001 to 5 mm, and comprise SiO.sub.2, Al.sub.2 O.sub.3, Fe.sub.2 O.sub.3, FeO, Na.sub.2 O, and K.sub.2 O.
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