Source: http://www.google.com/patents/US7625422?ie=ISO-8859-1
Timestamp: 2014-10-02 08:36:08
Document Index: 474577367

Matched Legal Cases: ['Application No. 102', 'Application No. 200380107392', 'application No. 0575245', 'application No. 10061386', 'application No. 196', 'application No. 248', 'application No. 2524541', 'application No. 2624302', 'application No. 2805906', 'application No. 3235559', 'application No. 3822999', 'application No. 40', 'application No. 41', 'application No. 694', 'application No. 69417103']

Patent US7625422 - Method and plant for the heat treatment of solids containing iron oxide ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsThe present invention relates to a method and a plant for the heat treatment of solids containing iron oxide, in which fine-grained solids are heated to a temperature of 700 to 1150� C. in a fluidized bed reactor (8). To improve the utilization of energy, it is proposed to introduce a first gas or gas...http://www.google.com/patents/US7625422?utm_source=gb-gplus-sharePatent US7625422 - Method and plant for the heat treatment of solids containing iron oxide using a fluidized bed reactorAdvanced Patent SearchPublication numberUS7625422 B2Publication typeGrantApplication numberUS 10/540,435PCT numberPCT/EP2003/013500Publication dateDec 1, 2009Filing dateDec 1, 2003Priority dateDec 23, 2002Fee statusPaidAlso published asCA2510925A1, CA2510925C, CN1756851A, CN100529118C, DE10260733A1, DE10260733B4, US8021600, US20070137435, US20100040512, WO2004057039A1Publication number10540435, 540435, PCT/2003/13500, PCT/EP/2003/013500, PCT/EP/2003/13500, PCT/EP/3/013500, PCT/EP/3/13500, PCT/EP2003/013500, PCT/EP2003/13500, PCT/EP2003013500, PCT/EP200313500, PCT/EP3/013500, PCT/EP3/13500, PCT/EP3013500, PCT/EP313500, US 7625422 B2, US 7625422B2, US-B2-7625422, US7625422 B2, US7625422B2InventorsAndreas Orth, Martin Hirsch, Peter Weber, Stuart Sneyd, Dirk Nuber, Michael Str�derOriginal AssigneeOutotec OyjExport CitationBiBTeX, EndNote, RefManPatent Citations (107), Non-Patent Citations (26), Referenced by (3), Classifications (29), Legal Events (4) External Links: USPTO, USPTO Assignment, EspacenetMethod and plant for the heat treatment of solids containing iron oxide using a fluidized bed reactorUS 7625422 B2Abstract The present invention relates to a method and a plant for the heat treatment of solids containing iron oxide, in which fine-grained solids are heated to a temperature of 700 to 1150� C. in a fluidized bed reactor (8). To improve the utilization of energy, it is proposed to introduce a first gas or gas mixture from below through at least one gas supply tube (9) into a mixing chamber region (15) of the reactor (8), the gas supply tube (9) being at least partly surrounded by a stationary annular fluidized bed (12) which is fluidized by supplying fluidizing gas. The gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed (12) are adjusted such that the Particle-Froude-Numbers in the gas supply tube (9) are between 1 and 100, in the annular fluidized bed (12) between 0.02 and 2, and in the mixing chamber (15) between 0.3 and 30.
1. A method for the heat treatment of solids containing iron oxide, in which fine-grained solids are heated to a temperature of 700 to 1150� C. in a fluidized bed reactor, comprising introducing the solids into the reactor, introducing a first gas or gas mixture from below through at least one gas supply tube into a mixing chamber of the reactor located above the orifice region of the at least one gas supply tube, the at least one gas supply tube being at least partly surrounded by a stationary annular fluidized bed which is fluidized by supplying fluidizing gas, wherein the gas flowing through the at least one gas supply tube entrains solids from the stationary annular fluidized bed into the mixing chamber when passing through the upper orifice region of the at least one gas supply tube, and further comprising adjusting the gas velocities of the first gas or gas mixture and of the fluidizing gas for the annular fluidized bed such that the Particle-Froude-Number in the at least one gas supply tube are between 1 and 100, in the annular fluidized bed between 0.02 and 2, and in the mixing chamber between 0.3 and 30, and removing treated solids from the reactor.
This application claims the benefit of International Application No. PCT/EP 2003/013500 filed on Dec. 1, 2003 under 35 U.S.C �371, entitled, �Method and Plant for the Heat Treatment of Solids Containing Iron Oxide Using a Fluidized Bed Reactor� which claims the benefit of German Patent Application No. 102 60 733.8 filed on Dec. 23, 2002.
TECHNICAL FIELD The present invention relates to a method for the heat treatment of solids containing iron oxide, in which fine-grained solids are heated to a temperature of 700 to 1150� C. in a fluidized bed reactor, and to a corresponding plant.
DESCRIPTION OF THE INVENTION Therefore, it is the object of the present invention to improve the conditions for a mass and heat transfer during the heat treatment of solids containing iron oxide.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the method shown in FIG. 1, which is in particular suited for preheating and prereducing iron-nickel ores and iron-manganese ores, fine-grained, possibly moist ore with a grain size of less than 10 mm is charged via a screw conveyor 1 into a suspension heat exchanger 2 of a first preheating stage, in which the material is preferably suspended and preheated by exhaust gas from a second preheating stage, until a large part of the surface moisture of the ore has been removed. Subsequently, the suspension is conveyed by the gas stream into a cyclone 3, in which the solids are separated from the gas. The separated solids then are conveyed through a conduit 4 into a second Venturi-type suspension heat exchanger 5, heated up further and again separated from the gas stream in a cyclone 6.
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Chemical Engineering Journal, vol. 66, (1997), p. 105-110.* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS8025836Nov 2, 2009Sep 27, 2011Outotec OyiMethod and plant for the heat treatment of solids containing iron oxideUS8048380Jul 10, 2009Nov 1, 2011Outotec OyjImproved thermal efficiency; e.g. alumina from aluminum hydroxide; gas supply tube surrounded by an annular chamber in which a stationary annular fluidized bed is disposed; and a mixing chamber disposed above an orifice region of the gas supply tubeUS20100322721 *Jan 23, 2009Dec 23, 2010Uhde GmbhMethod and apparatus for receiving fine-grained to coarse-grained solids from a vessel and transferring them to a higher-pressure system* Cited by examinerClassifications U.S. Classification75/444, 148/630, 266/172International ClassificationC22B5/14, B01J8/24, C22B1/10, B01J8/18, B01J8/44, F27B15/08, F27B15/10, B01J8/30, F27B15/02Cooperative ClassificationC22B5/14, B01J8/18, F27B15/10, B01J8/44, F27B15/02, C22B1/10, B01J8/30, F27B15/08, B01J2208/00061, B01J8/1863European ClassificationB01J8/18K4, B01J8/44, B01J8/18, C22B5/14, F27B15/02, C22B1/10, B01J8/30Legal EventsDateCodeEventDescriptionMar 14, 2013FPAYFee paymentYear of fee payment: 4Jun 3, 2009ASAssignmentOwner name: OUTOKUMPU TECHNOLOGY OYJ, FINLANDFree format text: CHANGE OF NAME;ASSIGNOR:OUTOKUMPU TECHNOLOGY OY;REEL/FRAME:022775/0457Effective date: 20060924Owner name: OUTOTEC OYJ, FINLANDFree format text: CHANGE OF NAME;ASSIGNOR:OUTOKUMPU TECHNOLOGY OYJ;REEL/FRAME:022775/0553Effective date: 20070422May 5, 2009ASAssignmentOwner name: OUTOKUMPU TECHNOLOGY OY, FINLANDFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ORTH, ANDREAS;HIRSCH, MARTIN;WEBER, PETER;AND OTHERS;REEL/FRAME:022644/0133;SIGNING DATES FROM 20060221 TO 20060223Mar 30, 2006ASAssignmentOwner name: OUTOKUMP TECHNOLOGY OY, FINLANDFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ORTH, ANDREAS;HIRSCH, MARTIN;WEBER, PETER;AND OTHERS;REEL/FRAME:017728/0562;SIGNING DATES FROM 20060221 TO 20060223RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google