The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 06, 2001
Filed:
Aug. 26, 1999
Glenn A. Heian, Franklin, WI (US);
Svedala Industries, Inc., Waukesha, WI (US);
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.