EP0090438A1 - Direct reduction method for iron ores - Google Patents
Direct reduction method for iron ores Download PDFInfo
- Publication number
- EP0090438A1 EP0090438A1 EP83200255A EP83200255A EP0090438A1 EP 0090438 A1 EP0090438 A1 EP 0090438A1 EP 83200255 A EP83200255 A EP 83200255A EP 83200255 A EP83200255 A EP 83200255A EP 0090438 A1 EP0090438 A1 EP 0090438A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rotary kiln
- reduction
- fluidized bed
- fine
- reduced
- 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.)
- Granted
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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
- C21B13/08—Making spongy iron or liquid steel, by direct processes in rotary furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/146—Multi-step reduction without melting
Definitions
- the invention relates to a process for the direct reduction of materials containing iron oxide to sponge iron with pre-reduction in a fluidized bed and final reduction below the melting temperature in a rotary kiln.
- the invention has for its object to produce a largely metallized sponge iron made of fine-grained materials in the rotary kiln without build-ups or agglomerations disturb the operation of the rotary kiln.
- This object is achieved according to the invention in that fine-grained materials containing iron oxide in the fluidized bed are reduced to 50 to 80% metallization of the iron content and the pre-reduced fine-grained material in the turn tube furnace is reduced.
- the ratio of metallic iron to the total iron content in percent is referred to as metallization
- a fluidized bed both low-expanded fluidized beds with a defined bed surface can be used as well as more expanded fluidized beds which are operated above the floating speed of the individual particles, such as. B. circulating fluidized beds.
- the pre-reduced material is preferably charged hot into the rotary kiln. On the one hand, this saves heating energy and relieves the rotary kiln - which is a poor heat exchanger - of the heating work. In principle, the pre-reduced material can also be charged cold into the rotary kiln. Coals, gas, oil or combinations of these reducing agents can be used as reducing agents in the rotary kiln.
- the rotary kiln can be operated in countercurrent or cocurrent and can be equipped with jacket pipes, jacket burners and / or nozzle stones. If necessary, desulfurizing agents are added. Any excess solid carbon in the discharge can be separated off and returned to the rotary kiln.
- the material pre-reduced according to the invention can be finished-reduced without problems in the rotary kiln, although its particle size in the fluidized bed has not been significantly increased.
- Special measures, such as B. high peripheral speed of the rotary kiln or limitation of the lower grain size are not required.
- a preferred embodiment is that the pre-reduction takes place in the fluidized bed to 60 to 70% metallization. This metallization leads to particularly favorable conditions both in the fluidized bed and in the rotary tube oven.
- a preferred embodiment is that the final reduction in the rotary kiln is carried out using solid carbon-containing reducing agents.
- the use of solid reducing agents loosens the feed in the rotary kiln. On the one hand, this further reduces the risk of agglomeration and formation of deposits and, on the other hand, has a favorable influence on the reduction.
- a preferred embodiment consists in that at least the major part of the solid carbon-containing reducing agent for the final reduction is already charged in the fluidized bed and is hot-charged with the pre-reduced material in the rotary kiln.
- the coal is also preheated and charged into the rotary kiln and, on the other hand, difficult, baking coals can also be used, the direct use of which in the rotary kiln would lead to malfunctions.
- a preferred embodiment is that the upper grain size of the fine-grained iron oxide-containing material is about 2 mm. This achieves advantageous operating conditions for the fluidized bed.
- a preferred embodiment is that a solid, fine-grain desulfurizing agent is added to the rotary kiln.
- the grain size of the desulfurization agent is less than 3 mm.
- Common desulfurization agents such as. B. limestone or dolomite is used. This enables a low sulfur content in the sponge iron to be achieved.
- a preferred embodiment consists in that the material to be discharged from the rotary kiln is separated into sponge iron, excess fuel and desulfurizing agent after cooling. In this way, the sulfur-containing desulfurization can be removed from the process in a simple manner and the excess carbon is also separated.
- a hematitic iron ore with 67% Fe was used.
- the grain size distribution was:
- the iron ore was used together with a lignite coal in an amount corresponding to 0.5 kg C fix / kg Fe in an electrically heated rotary kiln.
- the oven was heated to 980 ° C over four hours and held at that temperature.
- Material samples were taken from the furnace at intervals of one hour with an N 2 -flushed sample spoon and it was found that, starting with a degree of reduction (calculated as 0 2 -degradation) of approximately 50%, corresponding to a degree of metallization of approximately 25%, the material sintered together. A further reduction was therefore not possible.
- Example 1 The ore / coal mixture used in Example 1 was also reduced in a fluidized bed at 980 ° C. to a degree of reduction of 50%, corresponding to a degree of metallization of 25%.
- the pre-reduced material was then placed in an electrically heated rotary kiln. At a temperature of 980 ° C, the sintering of the Determine the contents of the oven.
- Example 1 The ore / coal mixture used in Example 1 was treated as described in Example 2, but was now reduced to a degree of reduction of 75%, corresponding to a degree of metallization of 63%, and, as described in Example 2, was used in the rotary kiln.
- the metallization could be increased to 92% without the furnace contents sintering.
- the advantages of the invention are that fine-grained materials can be reduced to sponge iron easily and economically, only cheap primary energy being required in both stages, and in particular in the final reduction stage.
- the rotary kiln is relieved of heating work.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Manufacture Of Iron (AREA)
- Apparatus For Disinfection Or Sterilisation (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
Feinkörniges eisenoxidhaltiges Material wird in einer Wirbelschicht vorreduziert und anschließend in einem Drehrohrofen fertigreduziert. Zur Vermeidung von Agglomeraten und Ansatzbildung im Drehrohrofen wird die Vorreduktion auf eine Metallisierung von 50 bis 80% durchgeführt.Fine-grained material containing iron oxide is pre-reduced in a fluidized bed and then reduced in a rotary kiln. To avoid agglomerates and build-up in the rotary kiln, the pre-reduction to a metallization of 50 to 80% is carried out.
Description
Die Erfindung betrifft ein Verfahren zur Direktreduktion von eisenoxidhaltigen Materialien zu Schwammeisen unter Vorreduktion in einer Wirbelschicht und Endreduktion unterhalb der Schmelztemperatur in einem Drehrohrofen.The invention relates to a process for the direct reduction of materials containing iron oxide to sponge iron with pre-reduction in a fluidized bed and final reduction below the melting temperature in a rotary kiln.
Bei der Aufbereitung ärmerer Eisenerze fallen in zunehmendem Maße feinkörnige Konzentrate mit einem beträchtlichen Anteil unter 0,25 mm Korngröße an. Diese und feinkörnige Erze sind preisgünstiger als z. B. Pellets oder Stückerze.When processing poorer iron ores, fine-grained concentrates with a considerable proportion below 0.25 mm grain size are increasingly being obtained. These and fine-grained ores are cheaper than z. B. pellets or lump ores.
Der Einsatz solcher feinkörnigen, eisenoxidhaltigen Materialien zur Direktreduktion in einem Drehrohrofen verursacht jedoch Schwierigkeiten, da feinkörnige Materialien - und insbesondere ihr hoher Anteil an Feinstkorn - bei der Reduktion zur Bildung von Agglomeraten und Ansätzen im Drehrohrofen führen.However, the use of such fine-grained materials containing iron oxide for direct reduction in a rotary kiln causes difficulties, since fine-grained materials - and in particular their high proportion of fine grains - lead to the formation of agglomerates and batches in the rotary kiln during the reduction.
Aus der DE-OS 20 20 306 ist es bekannt, feinkörnige Erze in einer Korngröße von etwa 0,25 bis 3 mm und schwefelbindende Materialien in einer Korngröße von etwa 0,2 bis 2 mm in den Drehrohrofen zu chargieren, den Drehrohrofen mit einer Umfangsgeschwindigkeit von 2 bis 20 m/min anzutreiben und die Temperatur in der Reduktionszone zwischen 1000 und 1115 °C zu halten. Die untere Korngröße des Erzes ist also limitiert, und außerdem muß der Drehrohrofen mit steigendem Anteil an kleiner Korngröße schneller rotiert werden.From DE-OS 20 20 306 it is known to charge fine-grained ores in a grain size of about 0.25 to 3 mm and sulfur-binding materials in a grain size of about 0.2 to 2 mm in the rotary kiln, the rotary kiln at a peripheral speed to drive from 2 to 20 m / min and to keep the temperature in the reduction zone between 100 0 and 1115 ° C. The lower grain size of the ore is therefore limited, and in addition, the rotary kiln must be rotated faster with increasing proportion of small grain size.
Aus der DE-OS 15 33 869 ist es bekannt, die Direktreduktion mittels reduzierender Gase zwecks Verbesserung der Ausnutzung der reduzierenden Gase zweistufig durchzuführen. Dabei wird in der Vorreduktionsstufe und in der Endreduktionsstufe jeweils etwa die Hälfte des insgesamt am Erz gebundenen Sauerstoffes abgebaut, d.h. in der Vorreduktion erfolgt eine Metallisierung von etwa 25 - 35 %. Die Reduktion in der Vorreduktion kann im Gegenstrom in einem Schachtofen, Drehrohrofen oder in einer Wirbelschicht erfolgen. Die Endreduktion kann ebenfalls in den genannten Apparaten im Gegenstrom, Gleichstrom oder Querstrom erfolgen. Bei der Verwendung von Drehrohröfen und dem Einsatz von Feinerz treten die bereits geschilderten Nachteile ein. Auch bei einer Verwendung einer Wirbelschicht in der Vorreduktion werden die Nachteile in einem nachfolgenden Drehrohrofen nicht vermieden.From DE-OS 15 33 869 it is known to carry out the direct reduction by means of reducing gases in order to improve the utilization of the reducing gases in two stages. In the pre-reduction stage and in the final reduction stage, approximately half of the total oxygen bound to the ore is mined, i.e. in the pre-reduction there is a metallization of about 25 - 35%. The reduction in the pre-reduction can take place in countercurrent in a shaft furnace, rotary tube furnace or in a fluidized bed. The final reduction can also be carried out in countercurrent, cocurrent or crosscurrent in the apparatuses mentioned. When using rotary kilns and using fine ore, the disadvantages already described occur. Even when using a fluidized bed in the pre-reduction, the disadvantages in a subsequent rotary kiln are not avoided.
Es ist auch bekannt, eine Vorreduktion mit einer Metallisierung von 50 bis 80 % in einer Wirbelschicht durchzuführen und die Endreduktion als Schmelzreduktion in elektrischen Öfen durchzuführen (DE-OS 25 52 904, DE-OS 26 07 554, DE-AS 22 53 228). Für die Endreduktion wird eine große Menge teurer elektrischer Energie verbraucht. Eine weitergehende Metallisierung in der Wirbelschicht führt zu Schwierigkeiten in der Wirbelschicht.It is also known to carry out a pre-reduction with a metallization of 50 to 80% in a fluidized bed and to carry out the final reduction as a smelting reduction in electric furnaces (DE-OS 25 52 904, DE-OS 26 07 554, DE-AS 22 53 228) . A large amount of expensive electrical energy is consumed for the final reduction. Further metallization in the fluidized bed leads to difficulties in the fluidized bed.
Der Erfindung liegt die Aufgabe zugrunde, im Drehrohrofen ein weitgehend metallisiertes Schwammeisen aus feinkörnigen Materialien zu erzeugen, ohne daß Ansatzbildungen oder Agglomerationen den Drehrohrofenbetrieb stören.The invention has for its object to produce a largely metallized sponge iron made of fine-grained materials in the rotary kiln without build-ups or agglomerations disturb the operation of the rotary kiln.
Die Lösung dieser Aufgabe erfolgt erfindungsgemäß dadurch, daß feinkörnige eisenoxidhaltige Materialien in der Wirbelschicht auf 50 bis 80 % Metallisierung des Eiseninhaltes vorreduziert werden und das vorreduzierte feinkörnige Material in dem Drehrohrofen fertigreduziert wird.This object is achieved according to the invention in that fine-grained materials containing iron oxide in the fluidized bed are reduced to 50 to 80% metallization of the iron content and the pre-reduced fine-grained material in the turn tube furnace is reduced.
Als Metallisierung ist das Verhältnis von metallischem Eisen zum gesamten Eisengehalt in Prozent bezeichnet
Überraschenderweise hat sich herausgestellt, daß sich das gemäß der Erfindung vorreduzierte Material problemlos im Drehrohrofen fertigreduzieren läßt, obwohl seine Korngröße in der Wirbelschicht nicht wesentlich vergrößert wurde. Besondere Maßnahmen, wie z. B. hohe Umfangsgeschwindigkeit des Drehrohrofens oder Limitierung der unteren Korngröße, sind nicht erforderlich.Surprisingly, it has been found that the material pre-reduced according to the invention can be finished-reduced without problems in the rotary kiln, although its particle size in the fluidized bed has not been significantly increased. Special measures, such as B. high peripheral speed of the rotary kiln or limitation of the lower grain size are not required.
Eine vorzugsweise Ausgestaltung besteht darin, daß die Vorreduktion in der Wirbelschicht auf 60 bis 70 % Metallisierung erfolgt. Diese Metallisierung führt zu besonders günstigen Bedingungen sowohl in der Wirbelschicht als auch im Drehrohrofen.A preferred embodiment is that the pre-reduction takes place in the fluidized bed to 60 to 70% metallization. This metallization leads to particularly favorable conditions both in the fluidized bed and in the rotary tube oven.
Eine vorzugsweise Ausgestaltung besteht darin, daß die Endreduktion im Drehrohrofen mittels fester Kohlenstoffhaltiger Reduktionsmittel erfolgt. Die Verwendung von festen Reduktionsmitteln bewirkt eine Auflockerung der Beschickung im Drehrohrofen. Dadurch wird einerseits die Gefahr der Agglomerierung und Ansatzbildung nochmals verringert und andererseits die Reduktion günstig beeinflußt.A preferred embodiment is that the final reduction in the rotary kiln is carried out using solid carbon-containing reducing agents. The use of solid reducing agents loosens the feed in the rotary kiln. On the one hand, this further reduces the risk of agglomeration and formation of deposits and, on the other hand, has a favorable influence on the reduction.
Eine vorzugsweise Ausgestaltung besteht darin, daß mindestens der überwiegende Teil des festen kohlenstoffhaltigen Reduktionsmittels für die Endreduktion bereits in die Wirbelschicht chargiert wird und mit dem vorreduzierten Material heiß in den Drehrohrofen chargiert wird. Dadurch wird einerseits die Kohle ebenfalls vorgeheizt in den Drehrohrofen chargiert und andererseits können auch schwierige, backende Kohlen verwendet werden, deren direkter Einsatz in den Drehrohrofen zu Betriebsstörungen führen würde.A preferred embodiment consists in that at least the major part of the solid carbon-containing reducing agent for the final reduction is already charged in the fluidized bed and is hot-charged with the pre-reduced material in the rotary kiln. As a result, the coal is also preheated and charged into the rotary kiln and, on the other hand, difficult, baking coals can also be used, the direct use of which in the rotary kiln would lead to malfunctions.
Eine vorzugsweise Ausgestaltung besteht darin, daß die obere Korngröße des feinkörnigen eisenoxidhaltigen Materials bei etwa 2 mm liegt. Dadurch werden vorteilhafte Betriebsbedingungen für die Wirbelschicht erzielt.A preferred embodiment is that the upper grain size of the fine-grained iron oxide-containing material is about 2 mm. This achieves advantageous operating conditions for the fluidized bed.
Eine vorzugsweise Ausgestaltung besteht darin, daß dem Drehrohrofen ein festes feinkörniges Entschwefelungsmittel zugesetzt wird. Die Korngröße des Entschwefelungsmittels liegt unter 3 mm. Es werden übliche Entschwefelungsmittel wie z. B. Kalkstein oder Dolomit verwendet. Dadurch kann ein niedri- ger Schwefelgehalt im Eisenschwamm erzielt werden.A preferred embodiment is that a solid, fine-grain desulfurizing agent is added to the rotary kiln. The grain size of the desulfurization agent is less than 3 mm. Common desulfurization agents such as. B. limestone or dolomite is used. This enables a low sulfur content in the sponge iron to be achieved.
Eine vorzugsweise Ausgestaltung besteht darin, daß das Austragsgut des Drehrohrofens nach Kühlung in Eisenschwamm, Brennstoffüberschuß und Entschwefelungsmittel getrennt wird. Auf diese Weise kann das den Schwefel enthaltende Entschwefelungsmittel in einfacher Weise aus den Verfahren ausgeschleust werden und dabei auch der überschüssige Kohlenstoff abgetrennt werden.A preferred embodiment consists in that the material to be discharged from the rotary kiln is separated into sponge iron, excess fuel and desulfurizing agent after cooling. In this way, the sulfur-containing desulfurization can be removed from the process in a simple manner and the excess carbon is also separated.
Die Erfindung wird anhand von Beispielen näher erläutert.The invention is explained in more detail by means of examples.
Es wurde ein hämatitisches Eisenerz mit 67 % Fe verwendet. Die Korngrößenverteilung war:
Das Eisenerz wurde zusammen mit einer Lignitkohle in einer Menge entsprechend 0,5 kg Cfix/kg Fe in einen elektrisch beheizten Drehrohrofen eingesetzt. Der Ofen wurde im Laufe von vier Stunden auf 980 °C aufgeheizt und bei dieser Temperatur gehalten. In Abständen von jeweils einer Stunde wurden dem Ofen mit einem N2-gespülten Probelöffel Materialproben entnommen und festgestellt, daß, beginnend bei einem Reduktionsgrad (gerechnet als 02-Abbau) von etwa 50 %, entsprechend einem Metallisierungsgrad von etwa 25 %, das Material zusammensinterte. Eine weitergehende Reduktion war daher nicht zu erreichen.The iron ore was used together with a lignite coal in an amount corresponding to 0.5 kg C fix / kg Fe in an electrically heated rotary kiln. The oven was heated to 980 ° C over four hours and held at that temperature. Material samples were taken from the furnace at intervals of one hour with an N 2 -flushed sample spoon and it was found that, starting with a degree of reduction (calculated as 0 2 -degradation) of approximately 50%, corresponding to a degree of metallization of approximately 25%, the material sintered together. A further reduction was therefore not possible.
Die im Beispiel 1 verwendete Erz/Kohle-Mischung wurde in einer Wirbelschicht ebenfalls bei 980 °C bis zu einem Reduktionsgrad von 50 %, entsprechend einem Metallisierungsgrad von 25 %, reduziert. Das vorreduzierte Material wurde anschließend in einen elektrisch beheizten Drehrohrofen eingesetzt. Bei einer Temperatur von 980 °C war bereits nach kurzer Zeit bei nur geringfügig angestiegener Metallisierung eine Versinterung des Ofeninhaltes festzustellen.The ore / coal mixture used in Example 1 was also reduced in a fluidized bed at 980 ° C. to a degree of reduction of 50%, corresponding to a degree of metallization of 25%. The pre-reduced material was then placed in an electrically heated rotary kiln. At a temperature of 980 ° C, the sintering of the Determine the contents of the oven.
Die in Beispiel 1 verwendete Erz/Kohlemischung wurde, wie in Beispiel 2 beschrieben, behandelt, jedoch jetzt bis zu einem Reduktionsgrad von 75 %, entsprechend einem Metallisierungsgrad von 63 %, reduziert und, wie in Beispiel 2 beschrieben, in den Drehrohrofen eingesetzt. Dabei konnte die Metallisierung bis auf 92 % erhöht werden, ohne daß eine Versinterung des Ofeninhaltes eintrat.The ore / coal mixture used in Example 1 was treated as described in Example 2, but was now reduced to a degree of reduction of 75%, corresponding to a degree of metallization of 63%, and, as described in Example 2, was used in the rotary kiln. The metallization could be increased to 92% without the furnace contents sintering.
Die Vorteile der Erfindung bestehen darin, daß feinkörnige Materialien problemlos und in wirtschaftlicher Weise zu Schwammeisen reduziert werden können, wobei in beiden Stufen, und insbesondere in der Endreduktionsstufe, nur billige Primärenergie benötigt wird. Außerdem wird gleichzeitig der Drehrohrofen von Aufheizarbeit entlastet.The advantages of the invention are that fine-grained materials can be reduced to sponge iron easily and economically, only cheap primary energy being required in both stages, and in particular in the final reduction stage. In addition, the rotary kiln is relieved of heating work.
Claims (7)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19823210232 DE3210232A1 (en) | 1982-03-20 | 1982-03-20 | METHOD FOR THE DIRECT REDUCTION OF MATERIALS CONTAINING IRON OXIDE TO SPONGE IRON |
| DE3210232 | 1982-03-20 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0090438A1 true EP0090438A1 (en) | 1983-10-05 |
| EP0090438B1 EP0090438B1 (en) | 1985-08-28 |
Family
ID=6158802
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP83200255A Expired EP0090438B1 (en) | 1982-03-20 | 1983-02-19 | Direct reduction method for iron ores |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4443250A (en) |
| EP (1) | EP0090438B1 (en) |
| AU (1) | AU556203B2 (en) |
| CA (1) | CA1204943A (en) |
| DE (2) | DE3210232A1 (en) |
| IN (1) | IN158419B (en) |
| NO (1) | NO159864C (en) |
| NZ (1) | NZ203437A (en) |
| PH (1) | PH20105A (en) |
| ZA (1) | ZA831901B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE602007014062D1 (en) | 2006-08-01 | 2011-06-01 | Iron Mineral Beneficiation Services Proprietary Ltd | METHOD FOR THE INDUSTRIAL MANUFACTURE OF IRON |
| JP5123571B2 (en) * | 2007-06-04 | 2013-01-23 | 住友重機械工業株式会社 | Reduction processing apparatus and reduction processing method |
| US8333821B2 (en) * | 2010-02-05 | 2012-12-18 | Innova Powders, Inc. | Environmentally friendly system and method for manufacturing iron powder |
| CN105723002B (en) * | 2014-03-11 | 2018-03-27 | 新日铁住金株式会社 | The manufacture method and manufacturing equipment of reduced iron |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2663632A (en) * | 1951-03-06 | 1953-12-22 | Nat Lead Co | Reduction of iron ores |
| FR1128520A (en) * | 1954-04-09 | 1957-01-07 | Improvement in iron oxide reduction processes | |
| GB979053A (en) * | 1960-04-27 | 1965-01-01 | Yawata Iron & Steel Co | Rapid direct reduction method of iron oxide |
| DE1270581B (en) * | 1957-08-12 | 1968-06-20 | Hydrocarbon Research Inc | Process for reducing iron oxide |
| FR2086342A1 (en) * | 1970-04-25 | 1971-12-31 | Metallgesellschaft Ag | Fine grained iron contg oxide materials,direct reduction |
| DE2239605A1 (en) * | 1971-08-12 | 1973-04-26 | Nippon Kokan Kk | METHOD AND DEVICE FOR DIRECT IRON REDUCTION |
| DE2428715A1 (en) * | 1974-06-14 | 1975-12-18 | Polysius Ag | Process and plant for ore redn and pelletising - using multi-stage cyclone preheater followed by rotary drum furnace |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR1365441A (en) * | 1963-05-21 | 1964-07-03 | Siderurgie Fse Inst Rech | Method and device for reducing iron ore fines in a rotary kiln |
-
1982
- 1982-03-20 DE DE19823210232 patent/DE3210232A1/en not_active Withdrawn
- 1982-06-18 IN IN707/CAL/82A patent/IN158419B/en unknown
- 1982-09-14 US US06/417,958 patent/US4443250A/en not_active Expired - Fee Related
-
1983
- 1983-02-19 DE DE8383200255T patent/DE3360636D1/en not_active Expired
- 1983-02-19 EP EP83200255A patent/EP0090438B1/en not_active Expired
- 1983-03-02 NZ NZ203437A patent/NZ203437A/en unknown
- 1983-03-03 NO NO830733A patent/NO159864C/en unknown
- 1983-03-18 AU AU12664/83A patent/AU556203B2/en not_active Ceased
- 1983-03-18 CA CA000423928A patent/CA1204943A/en not_active Expired
- 1983-03-18 ZA ZA831901A patent/ZA831901B/en unknown
- 1983-03-18 PH PH28668A patent/PH20105A/en unknown
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2663632A (en) * | 1951-03-06 | 1953-12-22 | Nat Lead Co | Reduction of iron ores |
| FR1128520A (en) * | 1954-04-09 | 1957-01-07 | Improvement in iron oxide reduction processes | |
| DE1270581B (en) * | 1957-08-12 | 1968-06-20 | Hydrocarbon Research Inc | Process for reducing iron oxide |
| GB979053A (en) * | 1960-04-27 | 1965-01-01 | Yawata Iron & Steel Co | Rapid direct reduction method of iron oxide |
| FR2086342A1 (en) * | 1970-04-25 | 1971-12-31 | Metallgesellschaft Ag | Fine grained iron contg oxide materials,direct reduction |
| DE2239605A1 (en) * | 1971-08-12 | 1973-04-26 | Nippon Kokan Kk | METHOD AND DEVICE FOR DIRECT IRON REDUCTION |
| DE2428715A1 (en) * | 1974-06-14 | 1975-12-18 | Polysius Ag | Process and plant for ore redn and pelletising - using multi-stage cyclone preheater followed by rotary drum furnace |
Non-Patent Citations (1)
| Title |
|---|
| PATENTS ABSTRACTS OF JAPAN, Band 3, Nr. 95, 11. August 1979, Seite 33C55 & JP - A - 54 72707 (ISHIKAWAJIMA HARIMA JUKOGYO K.K.) 11.06.1979 * |
Also Published As
| Publication number | Publication date |
|---|---|
| AU556203B2 (en) | 1986-10-23 |
| NZ203437A (en) | 1985-01-31 |
| EP0090438B1 (en) | 1985-08-28 |
| DE3210232A1 (en) | 1983-09-22 |
| US4443250A (en) | 1984-04-17 |
| ZA831901B (en) | 1984-10-31 |
| IN158419B (en) | 1986-11-15 |
| NO830733L (en) | 1983-09-21 |
| DE3360636D1 (en) | 1985-10-03 |
| NO159864C (en) | 1989-02-15 |
| CA1204943A (en) | 1986-05-27 |
| PH20105A (en) | 1986-09-29 |
| AU1266483A (en) | 1983-09-22 |
| NO159864B (en) | 1988-11-07 |
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