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:
Sep. 18, 2001
Filed:
Mar. 26, 1999
Applicant:
Inventor:
Jiann-Yang Hwang, Houghton, MI (US);
Assignee:
Board of Control for Michigan Technological University, Houghton, MI (US);
Primary Examiner:
Int. Cl.
CPC ...
C01C 1/02 ; C01C 1/10 ; C04B 1/808 ;
U.S. Cl.
CPC ...
C01C 1/02 ; C01C 1/10 ; C04B 1/808 ;
Abstract
A method for removing ammonia and ammonia compounds from fly ash and other combustion by-products is provided. The method may be performed with raw or processed fly ash, or it may be performed in conjunction with a wet beneficiation process. The method involves mixing the ammonia-contaminated fly ash with water and then filtering and/or drying the solution to remove the ammonia and water. The method produces fly ash having an ammonia content of less than about 60-80 ppm, which allows the fly ash to be utilized in a number of applications.