EP1930449B1 - Schachtofen - Google Patents
Schachtofen Download PDFInfo
- Publication number
- EP1930449B1 EP1930449B1 EP07023877A EP07023877A EP1930449B1 EP 1930449 B1 EP1930449 B1 EP 1930449B1 EP 07023877 A EP07023877 A EP 07023877A EP 07023877 A EP07023877 A EP 07023877A EP 1930449 B1 EP1930449 B1 EP 1930449B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- shaft furnace
- burden
- cooling gas
- cone
- cooling
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 9
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000000112 cooling gas Substances 0.000 claims description 43
- 239000007789 gas Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 21
- 239000004215 Carbon black (E152) Substances 0.000 claims description 8
- 229930195733 hydrocarbon Natural products 0.000 claims description 8
- 150000002430 hydrocarbons Chemical class 0.000 claims description 8
- 230000007704 transition Effects 0.000 claims description 7
- 238000002347 injection Methods 0.000 abstract description 6
- 239000007924 injection Substances 0.000 abstract description 6
- 230000005484 gravity Effects 0.000 abstract description 5
- 239000000203 mixture Substances 0.000 abstract description 3
- 238000006722 reduction reaction Methods 0.000 description 26
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 11
- 235000013980 iron oxide Nutrition 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- VBMVTYDPPZVILR-UHFFFAOYSA-N iron(2+);oxygen(2-) Chemical class [O-2].[Fe+2] VBMVTYDPPZVILR-UHFFFAOYSA-N 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/005—Shaft or like vertical or substantially vertical furnaces wherein no smelting of the charge occurs, e.g. calcining or sintering furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/16—Arrangements of tuyeres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B1/00—Shaft or like vertical or substantially vertical furnaces
- F27B1/10—Details, accessories, or equipment peculiar to furnaces of these types
- F27B1/18—Arrangements of dust collectors
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
Definitions
- the present invention relates to a vertical shaft furnace for a burden moving under the influence of gravitation from the top to the bottom of the shaft furnace, in particular for the production of directly reduced iron, with a hot reduction zone and a cooling zone following the reduction zone, in which feed openings for a cooling gas are provided, and with a cooling gas collecting member which is provided in a transition portion between the reduction zone and the cooling zone.
- US 4,054,444 discloses such a shaft furnace.
- a feed opening for the burden and furnace gas outlet are provided at the top of the shaft furnace.
- a burden of iron oxide material may be fed into the shaft furnace through the feed opening.
- the furnace gas outlet serves for discharging used furnace gas.
- the feed opening forms the upper end of a reduction zone, in which gas bustle ports are provided in order to introduce reduction gas, which contains carbon monoxide and hydrocarbon and is produced in a reformer.
- Reduction gas reduces the iron oxide at high temperatures directly into iron.
- the reduction zone is followed by a transition zone where hot material passes to a cooling zone with minimum changes in the chemistry of the product.
- the cooling gas collecting chamber is for receiving hot cooling gas, which has passed through the hot DRI material cooling zone, and recycling it through the cooling gas scrubber to the cooling zone of the furnace. In this way the DRI is cooled, prior to discharge through the bottom of the shaft furnace discharge feeder.
- a cooling gas collecting member is, however, provided in the central part of the shaft furnace. In this way on both sides narrow portions remain in the transition region from the reduction zone to the cooling zone, through which cooling gas may pass into the reduction zone, because no measures are taken to prevent this. As a result the entry of cooling gas into the reduction zone is not effectively prevented, which leads to an undesired cooling of the burden in this zone. In this way more thermal energy has to be fed to the reduction zone in order to maintain the reduction reaction.
- the cooling gas collecting member comprises collector arms arranged in cross shape, each of which forms a cooling gas off-take as set forth in claim 1 and depicted in figs. 1 and 3 .
- collector arms arranged in cross-shape a transition from cooling gas from the cooling zone into the reduction zone is prevented. Accordingly there is no undesired cooling effect in the reduction zone, so that the efficiency of the shaft furnace is improved.
- the cooling gas off-takes have a cross sectional area increasing beginning from the crossing point towards the exterior side.
- the collector arms are slanted from the horizontal in the flow direction of the burden.
- the collector arms may be slanted in an angle between 5 to 10° from the horizontal direction. In this way the collector arms offer a reduced resistance to the flowing burden.
- the collector arms each have an edge for breaking the burden, which is oriented against the flow direction of the burden. In this way the burden may even more easy pass by the cooling gas collecting member.
- collector arms may be connected to each other at their outer edge portions. In this way an additional stability of the cooling gas collecting elements is obtained.
- the cooling gas collecting member comprises at least one cone, wherein the cone tip is oriented opposite to the flow direction of the burden.
- a cone breaks the burden in the direction of the shaft furnace side walls.
- the shaft furnace may furthermore comprise at least one gas pipe which is provided to discharge a hydrocarbon gas into the cone. In this way the cone is cooled, so that its durability is improved.
- An upper cone may be provided relative to the flow direction of the burden before the connector arms. By means of this upper cone the burden is easily passed by the crossing portion of the connector arms.
- the shaft furnace may also comprise a lower cone, which in relation to the flow direction of the burden is arranged behind the connector arms.
- This lower cone may be arranged directly at the base face of the upper cone between the collector arms. The lower cone supports the uniform flow of the burden.
- Figure 1 shows a shaft furnace 100 according to the present invention in schematic view, which is in particular adapted for the production of directly reduced iron.
- the shaft furnace 100 has a generally cylindrical form and is vertically arranged.
- a furnace exit gas outlet 120 is provided at the top of the shaft furnace 100, the central axis of the shaft furnace outlet 120 being inclined with regard to the horizontal axis of the shaft furnace 100 by an angle of 45 to 55°.
- the furnace gas outlet 120 is connected with a furnace gas main pipe 123 in such a way, that the central axis of the furnace gas outlet 120 and of the furnace gas main pipe 123 turn at an angle of 90°.
- a feed opening 109 for a burden 115 of iron oxide material is provided at the top of the shaft furnace 100.
- the shaft furnace 100 is designed in such a way, that the burden 115 will move under the influence of gravity from the top to the bottom of the shaft furnace downwardly through the interior of the shaft furnace 100.
- the interior of the shaft furnace 100 is devided into a reduction zone 101, the upper end of which forms the feed opening 109, and a cooling zone 103, which is arranged immediately underneath the reduction zone 101.
- a discharge opening 190 is provided, through which the reduced iron may be discharged from the shaft furnace 100.
- the shaft furnace 100 comprises a reducing gas feeding device 130, which is connected with two bustle gas lines 131, 132 with two sets of bustle gas ports 133, 134.
- the bustle gas ports 133, 134 are arranged at two vertically different levels on the periphery of the shaft furnace wall.
- Both bustle gas lines 131, 132 are equipped with an injection system 400, 410 for a gas mixture.
- the two injection systems 400 410 are each connected with a hydrocarbon source 401, 415 and an oxygen source 402, wherein the two hydrocarbon sources 401, 415 may differ from one another.
- Both injection systems 400, 410 are designed in such a way, that the amount of hydrocarbon and oxygen may be regulated separately.
- FIG. 2 shows an enlarged side view of the injection system 400.
- the injection system 400 comprises two lines 403, 404, wherein the line 403 is connected with the hydrocarbon source 401 and the line 404 is connected with the oxygen source 402.
- the line 403 runs coaxially within the line 404, and both lines are connected to a mixing portion 405.
- the mixing portion 405 has a discharge opening 406 for the hydrocarbon-oxygen-mixture.
- cooling gas nozzles 166 are provided on the shell, which are connected with a cooling gas inlet header 165.
- a cooling gas collecting member 160 is provided in the lower part of a transition zone between the reduction zone 101 and the cooling zone 103.
- the cooling gas collecting member 160 is shown in figures 3 and 4 in an enlarged scale. It comprises invertedly tapered channels formed in collector arms 181, 182, 183, 184 arranged in a cross shape, each of which forms a cooling gas off-take 170, 171, 172, 173.
- the lower side of the collector arms 181, 182, 183, 184 opposite to the shaft furnace bottom have suction openings for the cooling gas formed therein.
- the cross sectional area of the cooling gas off-takes 170, 171, 172, 173 increases beginning from the crossing point towards the exterior side.
- collector arms 181, 182, 183, 184 are inclined with an angle between 5 and 10° from the horizontal direction in the direction of the shaft furnace shell.
- the collector arms 182, 183 and 183, 184 and 181, 184 are connected at their outer edge portions to each other, so that all collector arms 181, 182, 183, 184 form a common off-take header.
- the off-take header is connected with an outlet 164, in which a suction device may be provided.
- the cooling gas collecting number 160 is further provided with an upper hollow cone 161, which is provided above the collector arms 181, 182, 183, 184 in the center thereof (see fig. 4 ).
- the upper cone 161 is hollow.
- a lower cone 162 is provided, which in relation of the flow direction of the burden 115 is positioned behind (beneath) the collector arms 181, 182, 183, 184 in the center thereof.
- a gas pipe 151 is connected to the hollow interior of the upper cone 161 and is connected to hydrocarbon source which is not shown in the drawing.
- rotating shafts 180, 185 are provided for breaking and grinding clusters, if present.
- the burden 115 of iron oxide material is fed through the feed opening 109, into the reduction zone 101.
- a hot reduction gas of hydrogen and carbon monoxide is blown into the reduction zone 101 through the bustle gas ports 133, 134 in such a way, that it flows in the opposite direction of the burden 115, which flows downwardly under the influence of gravity.
- the reduction gas reduces the iron oxide at high temperature and in direct contact with the iron.
- the reacted reduction gas then reaches the shaft furnace top, where it enters the furnace gas outlet 120. Due to the inclination of the furnace gas outlet 120 only a small amount of dust particles reaches the furnace gas main pipe 123, because gravity restrains the dust particles.
- the reduced burden 115 descends from the reduction zone 101 into the cooling zone 103. On its way it passes the cooling gas collecting member 160, thereby passing between the collector arms 181, 182, 183, 184, which offer a comparatively small resistance. At the same time the burden 115 is loosened by the top cone 161 in the direction of the shaft furnace wall. The top cone 161 is cooled by the gas entering into the interior thereof.
- a cooling gas is blown in by way of the cooling gas ports 166.
- the cooling gas streams upwardly against the descending burden 115 thereby cooling the burden 115.
- hot gas reaches the collector arms 181, 182, 183, 184 and exits through the suction openings thereof into the cooling gas off-takes 171, 172, 173, 174.
- the cooling gas is then passed to the cooling gas offtake header 164 through the cooling gas off-takes 171, 172, 173, 174 and is thus effectively removed from the shaft furnace 100 at the lower limit of the cooling zone 103. In this way, the cooling gas is effectively prevented from entering into the reduction zone 101.
- the cooled-off burden 115 finally discharges through the discharge port 190 from the shaft furnace 100.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Metallurgy (AREA)
- Materials Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Manufacture Of Iron (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Compressor (AREA)
- Heat Treatment Of Articles (AREA)
Claims (11)
- Vertikaler Schachtofen (100) für eine Beschickung (115), die sich unter dem Einfluss der Schwerkraft von dem oberen Bereich zu dem unteren Bereich des Schachtofens bewegt, insbesondere für die Produktion von direkt reduziertem Eisen, mit einer Heißreduktionszone (101) und einer auf die Reduktionszone (101) folgenden Kühlzone (103), in der Zuführöffnungen für ein Kühlgas (165) vorgesehen sind, und mit einem Kühlgassammelelement (160), das in einem Übergangsbereich zwischen der Reduktionszone (101) und der Kühlzone (103) vorgesehen ist, dadurch gekennzeichnet, dass das Kühlgassammelelement 160) kreuzförmig angeordnete Sammlerarme (181-184) aufweist, von denen jeder einen Kühlgasabzug (170-173) bildet.
- Schachtofen (100) nach Anspruch 1, dadurch gekennzeichnet, dass die Kühlgasabzüge (171-173) eine Querschnittsfläche aufweisen, die sich ausgehend von dem Kreuzungspunkt in Richtung der Außenseite vergrößert.
- Schachtofen (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Sammlerarme (181-184) ausgehend von der Horizontale in Strömungsrichtung der Beschickung (115) geneigt sind.
- Schachtofen (100) nach Anspruch 3, dadurch gekennzeichnet, dass die Sammlerarme (181-184) ausgehend von der horizontalen Richtung in einem Winkel zwischen 5 bis 10° geneigt sind.
- Schachtofen (100) nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass die Sammlerarme (181-184) jeweils eine Kante zum Brechen der Beschickung (115) aufweisen, die entgegen der Strömungsrichtung der Beschickung (115) ausgerichtet ist.
- Schachtofen (100) nach einem der vorgehenden Ansprüche, dadurch gekennzeichnet, dass die Sammlerarme (181-184) miteinander verbunden sind, insbesondere an ihren Außenkantenbereichen.
- Schachtofen (100) nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass ein Kühlgassammelelement (160) wenigstens einen Konus (161, 162) aufweist, wobei die Konusspitze entgegen der Strömungsrichtung der Beschickung (115) ausgerichtet ist.
- Schachtofen (100) nach Anspruch 7, dadurch gekennzeichnet, dass dieser wenigstens eine Gasleitung (150) aufweist, die dazu vorgesehen ist, ein Kohlenwasserstoffgas in den Konus (161, 162) abzuleiten.
- Schachtofen (100) nach Anspruch 7 oder 8, dadurch gekennzeichnet, dass ein oberer Konus (161) relativ zur Strömungsrichtung der Beschickung (115) vor den Sammlerarmen (183 bis 184) vorgesehen ist.
- Schachtofen (100) nach einem der Ansprüche 7 bis 9, dadurch gekennzeichnet, dass ein unterer Konus (162) vorgesehen ist, der relativ zur Strömungsrichtung der Beschickung (115) hinter den Sammlerarmen (181-184) vorgesehen ist.
- Schachtofen (100) nach Anspruch 10, dadurch gekennzeichnet, dass der untere Konus (162) direkt an der Basisfläche des oberen Konus (161) zwischen den Sammlerarmen (181-184) vorgesehen ist.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IR138538200 | 2006-12-11 | ||
DE102006062689A DE102006062689B4 (de) | 2006-12-21 | 2006-12-21 | Schachtofen für die direkte Reduktion von Eisenoxid |
Publications (3)
Publication Number | Publication Date |
---|---|
EP1930449A2 EP1930449A2 (de) | 2008-06-11 |
EP1930449A3 EP1930449A3 (de) | 2009-01-07 |
EP1930449B1 true EP1930449B1 (de) | 2012-06-27 |
Family
ID=83229110
Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07023875A Active EP1930448B1 (de) | 2006-12-11 | 2007-12-10 | Schachtofen |
EP07023876A Active EP1930678B1 (de) | 2006-12-11 | 2007-12-10 | Schachtofen |
EP07023877A Active EP1930449B1 (de) | 2006-12-11 | 2007-12-10 | Schachtofen |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07023875A Active EP1930448B1 (de) | 2006-12-11 | 2007-12-10 | Schachtofen |
EP07023876A Active EP1930678B1 (de) | 2006-12-11 | 2007-12-10 | Schachtofen |
Country Status (4)
Country | Link |
---|---|
EP (3) | EP1930448B1 (de) |
AT (1) | ATE473302T1 (de) |
DE (4) | DE202007019169U1 (de) |
ES (3) | ES2386464T3 (de) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101556108B (zh) * | 2009-05-25 | 2010-12-01 | 四川大学 | 竖窑与竖窑法制磷酸的工艺 |
MX2019004914A (es) * | 2016-11-03 | 2019-06-06 | Midrex Technologies Inc | Proceso de reduccion directa y horno de eje que usa un cono desviador de flujo extendido. |
CN109182634B (zh) * | 2018-09-20 | 2023-08-15 | 中晋冶金科技有限公司 | 一种高效的气基竖炉直接还原炼铁系统及方法 |
US12084730B2 (en) | 2020-03-24 | 2024-09-10 | Midrex Technologies, Inc. | Methods and systems for increasing the carbon content of direct reduced iron in a reduction furnace |
CN116769994B (zh) * | 2023-08-25 | 2023-11-17 | 山西冶金工程技术有限公司 | 一种气基还原竖炉松料装置 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA874354A (en) * | 1971-06-29 | Huttenwerk Oberhausen Ag | Furnace for direct reduction of iron ores |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1458762A1 (de) * | 1965-07-29 | 1969-03-13 | Huettenwerk Oberhausen Ag | Schachtofen fuer die Direktreduktion von Eisenerz |
CA922519A (en) * | 1968-06-24 | 1973-03-13 | Beggs Donald | Method of and apparatus for reducing iron oxide to metallic iron |
AU459472B2 (en) * | 1971-03-29 | 1975-03-11 | Nippon Koran Kabushiki Kaisha | A combustion process and apparatus for blast furnaces |
AT342632B (de) * | 1973-11-06 | 1978-04-10 | Bischoff Gasreinigung | Gichtgasreinigungsanlage fur druckhochofen |
JPS5814485B2 (ja) * | 1975-08-29 | 1983-03-19 | イシカワジマハリマジユウコウギヨウ カブシキガイシヤ | ヨウコウロ |
US4054444A (en) | 1975-09-22 | 1977-10-18 | Midrex Corporation | Method for controlling the carbon content of directly reduced iron |
JPS5260204A (en) * | 1975-11-13 | 1977-05-18 | Ishikawajima Harima Heavy Ind Co Ltd | Dust remover for blast furnace |
JPS5832205B2 (ja) * | 1976-01-09 | 1983-07-12 | 石川島播磨重工業株式会社 | 高炉のガス捕集装置 |
GB2016124B (en) * | 1978-03-11 | 1982-06-09 | Hamburger Stahlwerke Gmbh | Rocess and apparatus for the direct reduction of iron ores |
US4536213A (en) * | 1984-09-10 | 1985-08-20 | Mildrex International, B.V. | Reforming of higher hydrocarbons for metal oxide reduction |
FR2702221B1 (fr) * | 1993-03-03 | 1995-04-28 | Air Liquide | Procédé d'obtention de métal au haut-fourneau ou au cubilot. |
US20020007699A1 (en) | 1997-09-05 | 2002-01-24 | Montague Stephen C. | Apparatus and method for optimizing the use of oxygen in the direct reduction of iron |
IT1302815B1 (it) * | 1998-12-11 | 2000-09-29 | Danieli & C Ohg Sp | Procedimento ed apparato per la riduzione diretta di minerale diferro con iniezione ottimizzata del gas riducente |
-
2007
- 2007-12-10 DE DE202007019169U patent/DE202007019169U1/de not_active Expired - Lifetime
- 2007-12-10 ES ES07023876T patent/ES2386464T3/es active Active
- 2007-12-10 EP EP07023875A patent/EP1930448B1/de active Active
- 2007-12-10 ES ES07023877T patent/ES2386466T3/es active Active
- 2007-12-10 DE DE202007019452U patent/DE202007019452U1/de not_active Expired - Lifetime
- 2007-12-10 EP EP07023876A patent/EP1930678B1/de active Active
- 2007-12-10 EP EP07023877A patent/EP1930449B1/de active Active
- 2007-12-10 DE DE602007007561T patent/DE602007007561D1/de active Active
- 2007-12-10 DE DE202007019472U patent/DE202007019472U1/de not_active Expired - Lifetime
- 2007-12-10 AT AT07023875T patent/ATE473302T1/de active
- 2007-12-10 ES ES07023875T patent/ES2346796T3/es active Active
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA874354A (en) * | 1971-06-29 | Huttenwerk Oberhausen Ag | Furnace for direct reduction of iron ores |
Also Published As
Publication number | Publication date |
---|---|
DE202007019452U1 (de) | 2012-08-27 |
EP1930678A2 (de) | 2008-06-11 |
EP1930448A2 (de) | 2008-06-11 |
EP1930449A2 (de) | 2008-06-11 |
EP1930678B1 (de) | 2012-06-27 |
EP1930678A3 (de) | 2008-12-31 |
DE202007019169U1 (de) | 2010-11-11 |
DE202007019472U1 (de) | 2012-10-12 |
EP1930448B1 (de) | 2010-07-07 |
ATE473302T1 (de) | 2010-07-15 |
ES2386466T3 (es) | 2012-08-21 |
EP1930449A3 (de) | 2009-01-07 |
EP1930448A3 (de) | 2008-12-31 |
ES2346796T3 (es) | 2010-10-20 |
DE602007007561D1 (de) | 2010-08-19 |
ES2386464T3 (es) | 2012-08-21 |
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