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:
Jun. 23, 1998
Filed:
Jul. 28, 1997
Applicant:
Inventor:
John W College, Pittsburgh, PA (US);
Assignee:
Dravo Lime Company, Pittsburgh, PA (US);
Primary Examiner:
Int. Cl.
CPC ...
C04B / ; C04B / ; C01B / ;
U.S. Cl.
CPC ...
106745 ; 106752 ; 106757 ; 106761 ; 106763 ; 106765 ; 106769 ; 4235411 ; 4235671 ; 423569 ; 423570 ;
Abstract
Cement and elemental sulfur are produced by forming a moist mixture of a flue gas desulfurization process waste product containing 80-95 percent by weight calcium sulfate hemihydrate and 5-20 percent by weight calcium sulfate hemihydrate, aluminum, iron, silica and carbon, agglomerating the moist mixture while drying the same to form a feedstock, and calcining the dry agglomerated feedstock in a rotary kiln. Sulfur dioxide produced during the calcination is cooled and contacted with hydrogen and carbon monoxide to reduce the same to elemental sulfur.