Rotary kiln for forming lightweight aggregate from flyash and sewage sludge
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United States of America Patent
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Feb 6, 2001
Grant Date -
N/A
app pub date -
Aug 26, 1999
filing date -
Aug 26, 1999
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for producing a lightweight aggregate by treating flyash and sewage sludge. The flyash and sewage sludge are mixed together and agglomerated into pellets. The pelletized agglomerate is fed into a rotary kiln in a direction that is co-current with the flow of fuel and air through the kiln. The rotary kiln includes at least one port air zone near the infeed end of the rotary kiln to introduce port air beneath the bed of pelletized agglomerate feed stock flowing through the rotary kiln. The introduction of port air beneath the material bed causes the volatized combustible matter to burn in the bed of material, which oxidizes the outer shell of the pelletized agglomerate. As the pelletized agglomerate continues to travel through the rotary kiln, bloating occurs within the interior of the material and results in the formation of the lightweight aggregate material.
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