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. 08, 1976
Filed:
Oct. 31, 1973
Jacques M Dulin, Libertyville, IL (US);
Edward C Rosar, Lakewood, CO (US);
Russell B Bennett, Worthington, OH (US);
Harvey S Rosenberg, Columbus, OH (US);
Joseph M Genco, Orono, ME (US);
Industrial Resources, Inc., Chicago, IL (US);
Abstract
Method for disposal of water soluble sodium sulfur oxide-containing wastes resulting from industrial processes producing fly and/or bottom ash from fossil fuel utilization and waste or excess sodium sulfur oxide compounds, particularly disposal of sodium sulfite and/or sodium sulfate resulting from wet or dry sodium alkali scrubbing of tail or flue gases to reduce SO.sub.x emissions therefrom as from smelters, power plants, paper plants, glass plants and industrial boiler operations. Process involves mixing sodium sulfur oxide wastes with an alumina and silica-containing fly ash and/or bottom ash, forming an agglomerate, such as a pellet or briquette, and sintering in the range of about (1000.degree.-2300.degree.F). The resultant sintered particle shows lower solubility than the current standard of calcium sulfate, being 10.sup..sup.-2 to 10.sup..sup.-4 as soluble as the starting sodium sulfur oxides, has increased density (as high as 2.3 g/l), and reduced volume as compared to the dry fly ash or sodium sulfur oxide wastes, and fixes heavy metals. Fly ash leaching and dusting problems are substantially overcome. Sodium sulfur oxides include sodium sulfite, sulfate, bisulfite, bisulfate, thiosulfite, persulfite (pyrosulfite), thiosulfate, persulfate (pyrosulfate), and mixtures thereof. Sintered particle may be disposed of by known landfill techniques, or used as an aggregate for mulch, road beds, concrete, asphalt or the like.