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Publication numberUST980005 I4
Publication typeGrant
Application numberUS 05/850,588
Publication dateMar 6, 1979
Filing dateNov 11, 1977
Priority dateNov 11, 1977
Publication number05850588, 850588, US T980005 I4, US T980005I4, US-I4-T980005, UST980005 I4, UST980005I4
InventorsArthur R. Shirley, Jr.
Original AssigneeTennessee Valley Authority
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Granulation and coating by improved method of heat removal
US T980005 I4
Abstract
an improved process for the granulation or coating of hygroscopic or nonhygroscopic materials where melt is sprayed onto cascading granules of common or uncommon substrate in an enclosed vessel such as a rotary drum preferably with lifting flights which provide maximum mixing of the granules and the atmosphere enclosed in the unit and where heat given off by solidification of the melt is absorbed by evaporation of water which is atomized as an extremely fine mist into areas of the vessel which are not subtended by falling granules. Evaporation is effected without impingement of the mist on the granules or vessel internals. Air for evaporation is pulled through the vessel concurrent with the flow of granules and its moisture content is regulated below the critical humidity of the granules throughout the vessel. Some recycle of undersize granules discharged from the vessel is maintained for size control; however, examples show the recycle rate decreased by 87 percent over recycle cooled processes as 73 percent of the heat evolved is removed by evaporation of water mist. An equation is developed which mathematically represents the thermodynamics of the process and specific values are presented for variables when granulating sulfur or urea.
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Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US5505885 *Jun 29, 1993Apr 9, 1996Bacardi; Jean M.Granulation of phosphorus pentasulfide with a predetermined reactivity
US5788896 *Feb 27, 1997Aug 4, 1998Alberta Research CouncilMethod of producing micron sized sulphur granules
Classifications
U.S. Classification264/7, 264/14
International ClassificationC01B17/02, C05C9/00, B01J2/12, B01J2/00
Cooperative ClassificationB01J2/006, C05C9/005, B01J2/12, C01B17/0237, C01B17/0248
European ClassificationC05C9/00B, B01J2/12, C01B17/02S, C01B17/02T2, B01J2/00D