CN1033649A - The middle reduction method that contains the ferriferous oxide material in the rotary kiln - Google Patents
The middle reduction method that contains the ferriferous oxide material in the rotary kiln Download PDFInfo
- Publication number
- CN1033649A CN1033649A CN88106723A CN88106723A CN1033649A CN 1033649 A CN1033649 A CN 1033649A CN 88106723 A CN88106723 A CN 88106723A CN 88106723 A CN88106723 A CN 88106723A CN 1033649 A CN1033649 A CN 1033649A
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- CN
- China
- Prior art keywords
- rotary kiln
- component
- ferric oxide
- added
- superfine
- 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.)
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- 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
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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)
- Muffle Furnaces And Rotary Kilns (AREA)
- Compounds Of Iron (AREA)
Abstract
Utilize the material that the solid carbon-contg reductive agent will contain ferric oxide to be reduced to sponge iron.The coarse-grained feed end charging that contains the material of ferric oxide from rotary kiln, the material that contains ferric oxide of particulate then is blown to reduced zone.For avoiding the interference of plasma to operation, the cake mass that contains ferric oxide is sieving between 3～6mm and is being divided into coarse grain component, fine component and superfine particle component between 0.8～1.5mm.The coarse grain component is added the rotary kiln from feed end, and the fines component blows into rotary kiln from discharge end, and is distributed on the material of reduced zone.
Description
This patent relates to a method of utilizing the solid carbon-contg reductive agent material that direct reduction contains ferric oxide in rotary kiln to prepare sponge iron, the wherein coarse-grained material that contains ferric oxide is added to the rotary kiln from feed end, and the material that contains ferric oxide of particulate directly blows to reduced zone.
When in rotary kiln, utilizing the solid carbon-contg reductive agent directly reduction bulk or ball shape ore preparing sponge iron under the temperature that is lower than the material softening temperature, usually reinforced preceding particulate below about 5mm is screened out toward rotary kiln in.The reason that must screen out these particulates is that they are heated than coarse grain lump ore in rotary kiln and reduce comparatively fast, so fine component occurs superheating phenomenon easily and/or reoxidized.Especially in the presence of coal ash, this can cause the softening and crust of material.What purchase usually is the ore particle of pulverizing in advance with specific size, for example size is between 60～100mm, then be ground into be no more than some specific between 15～25mm the ore particle of the upper limit, so just, can obtain a part, even may be up to the particulate that is lower than 5mm of raw material 25%, these can only be sold at discount or go out of use, and this has just improved the cost of producing sponge iron.
British patent specification the 1st, 098, disclosed a directly method of reduction particulate iron ore for No. 157, wherein all ore particles greater than 5mm or 2mm are all screened out and are added the rotary kiln from feed end, smitham then blows into the rotary kiln from discharge end, and it is distributed on the interior material of 4 meters long scopes at least.Superfine ore particle less than 0.06mm preferably sifts out from smitham, is pressed into ball shape or bulk and then adds to the rotary kiln from feed end.If have only a spot of ore particle greater than 5mm or 2mm, then ore particle can all blow to rotary kiln, and the superfine component of briquetting also can blow in the rotary kiln.But it is then not ideal when this method is used to handle massive ore.
One object of the present invention is the fine component that utilizes as far as possible economically in the treating processes of the massive ore that contains ferric oxide, what does not bring unfavorable to operating process simultaneously.
Realize among the present invention this purpose method be will add rotary kiln the cake mass that contains ferric oxide between screening 3～6mm and sieve and be divided into coarse grain component, fine component and superfine particle component between 0.8～1.5mm, the coarse grain component adds to the rotary kiln from feed end, and fine component blows to rotary kiln and is distributed on the material of reduced zone from discharge end.Term " cake mass that contains ferric oxide " comprises massive iron ore and the ball shape particle of being made up of iron ore or other material that contains ferric oxide, as the dirt slag of collecting in the steelmaking process.In ball shape granule materials, fine component comprises ball shape particle and ground particulate.Term " screening " has defined the component that the sieve with a certain size sieve aperture in the above-mentioned scope sifts out.Fine component utilizes an air-flow, and preferably airflow blows to rotary kiln from discharge end, and thicker relatively particle is blown to such an extent that distance is far away than relative thinner particle in rotary kiln like this.Adjust the speed and the distribution of mineral fine component, mineral will be heated, and guarantee to be reduced fully when it arrives discharge end.Can select one or more blowing devices for use.Fine component blows into the distance of rotary kiln and can adjust and control by the variation and/or the blowing rate variations of blowing device wind direction.Fine component can blow into rotary kiln separately or with the solid state reduction agent together.The flow direction of material and air can be reverse in the rotary kiln, also can be forward, and fine component blows into rotary kiln with the direction of air flowing wherein in contrary operation, is forward then blowing into rotary kiln with the direction in contrast to air flowing in the operation.Reduced zone in the rotary kiln is meant that reduction generates the zone of metallic iron.
A kind of preferably situation is that the discharge end that the fine component that will contain iron oxide material blows to the 40%(of whole rotary kiln length from rotary kiln measures), best situation is 15%～20% of a rotary kiln length.The fine component that is blown into above-mentioned length just obtains efficiently, reduction fast, and does not influence the operation of rotary kiln.
A kind of preferably situation is not add solid-state carbon containing reducer, and the fine component that will contain iron oxide material separately blows to rotary kiln, and being blown into separately of fine component can make it especially effectively and equably be distributed on the material.
A kind of preferably situation is that the fine component that contains iron oxide material is distributed in the top 1/4th in rotary kiln cross section, thereby is distributed on the material that drip gets off from the furnace wall.If rotary kiln is to anticlockwise, fine component will be distributed on the material at 1/4th places, right hand top, rotary kiln cross section, the fine component that is blown into like this is before being drawn in bed of material, can stop the long time on the surface of drip bed of material, thereby prolonged the residence time of fine component, the fines component is fully heated on the material surface.
A kind of preferably situation be will contain the superfine particle component of iron oxide material with the reduction that draws off from the rotary kiln discharge end material add to the indirect cooler together.The reduction that from rotary kiln, draws off material add in the indirect cooler, and secluding air because the discharge end of water cooler by rotary kiln links to each other with the gas atmosphere of reductibility, carries out under the reductive condition so cool off.Spray water on the outside surface of water cooler.Even the superfine particle component do not need additional expense, do not introduce operational inconvenience and can further be handled yet, because there is the superfine particle component in the first part of refractory materials highly to be reduced in water cooler.
A kind of preferably situation is that the superfine particle component that will contain iron oxide material adds in the transmission skewed slot between rotary kiln discharge end and indirect cooler feed end, it is mixed especially fully, the superfine particle component just is heated in transmitting skewed slot, thereby will be reduced effectively in water cooler.
At the rotary kiln that is used for forward operating, the superfine particle component also can be blown to rotary kiln from discharge end.This situation must guarantee that the superfine particle component taken out of fully by the atmosphere in the stove from melt down commentaries on classics, and adds to water cooler or store in the container of thermal material.
Particularly Tu Chu a kind of situation is that it is mixed with oil, can improve the carbon content of sponge iron like this.
To give an example below, the present invention will be described in detail.
80 meters of furnace superintendents of revolution, 4.8 meters of internal diameters from feed end, have 3 Air-Breathing Systems along the direction of rotary kiln length, and there are 8 air injection tube their back.Each Air-Breathing System all is made up of some air nozzles that distribute ringwise, and these air nozzles pass furnace wall and its refractory lining of rotary kiln, but does not protrude in the inside of rotary kiln.Air injection tube radially extends, and passes furnace wall and its refractory lining of rotary kiln, and its opening approximately is placed on the medullary ray of rotary kiln, and opening is facing to atmosphere mobile direction.Blow device for coal and comprise a device and a central burner of blowing smitham in the stove, be installed on the discharge end of rotary kiln.The effect of central burner is the heating rotary stove.Rotary kiln is when operation, and wherein material and atmosphere are countercurrent flow.
Iron ore contains 67.0% iron and 1.0% moisture content.At first ore powder being broken into the ore particle below the 20mm, is that the sieve of 1.0mm and 5.0mm is different screenings with its sieve with sieve aperture then.Coarse grain component greater than 5.0mm is added the rotary kiln from feed end with 30,500 kilograms/hour speed.1.0 the fine component of～5.0mm enters rotary kiln by a blowing device from discharge end with 3,000 kilograms/hour speed together with the air that drives them, and is distributed on the material of rotary kiln length 20% (measuring from its discharge end).Is after 100 kilograms/hour oil mixes, to add in the transmission skewed slot between rotary kiln discharge end and indirect cooler feed end the superfine particle component below the 1.0mm with 400 kilograms/hour speed and speed.
The composition that is used as the coal of reductive agent is:
Carbon 51.0%
Volatile matter 25.0%
Ash 24.0%
Sulphur 0.6%
Moisture 10%
Granular size 0～15mm
Coal adds to the rotary kiln from feed end with 12,500 kilograms/hour speed, enters in the rotary kiln by blowing device for coal together with airflow with 7,800 kilograms/hour speed simultaneously.
The above sponge iron particle of 3mm is with speed discharging from water cooler of 17,340 kilograms/hour, less than the sponge iron particle of 3mm then with speed discharging from water cooler of 5,800 kilograms/hour.Degree of metalization reaches 92～93%, and carbon content is 0.5%.
When the superfine particle component blows into rotary kiln together with fine component, serious crust problem will appear in the operation.
Advantage provided by the invention has been to reduce the cost of sponge iron, and the value that reduces is suitable with the value of fine component, goes out of use owing to the crust problem in the in other cases unresolved operation can not be added to it in rotary furnace. Even increased the through-put rate of rotary furnace, because other operating condition does not change. Required capital also decreases. It is less to blow into the sulphur that the fine component of rotary furnace absorbs, because along with fine component drops on the material, most of sulphur of being entered by the ribbing is discharged from or chemical combination.
Claims (7)
1, in rotary kiln, utilize the solid carbon-contg reductive agent directly the reduction material that contains ferric oxide prepare the method for sponge iron, the wherein coarse-grained material that contains ferric oxide is added to the rotary kiln from feed end, the material that contains ferric oxide of particulate then blows to reduced zone, be added to material that bulk in the rotary kiln contains ferric oxide between screening 3～6mm and be divided into coarse grain component, fine component and superfine particle component between 0.8～1.5mm, the coarse grain component is added to the rotary kiln from feed end, and fine component is blown to the rotary kiln and is distributed on the material of reduced zone from discharge end.
2, the discharge end that the method in the claim 1, the fine component that wherein contains iron oxide material are blown to the 40%(of rotary kiln length from rotary kiln measures), between 15～20% better.
3, the method in claim 1 or the claim 2, wherein under the situation that does not add solid-state carbon containing reducer, the fine component that will contain iron oxide material blows to rotary kiln.
4, the method in any one in the claim 1 to 3, the fine component that wherein contains iron oxide material is distributed in 1/4th places, top in rotary kiln cross section, and enters from the material that the furnace wall drip gets off.
5, the method in any one in the claim 1 to 4, the superfine component that wherein will contain iron oxide material with the reduction that from rotary kiln, draws off material be added in the indirect cooler together.
6, of adding between the feed end of the discharge end of rotary kiln and indirect cooler transmits in the skewed slot for the method in the claim 5, the superfine component that wherein will contain iron oxide material.
7, the method in claim 5 or the claim 6 was wherein mixed superfine component before being added to water cooler with oil.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3743007 | 1987-12-18 | ||
| DE19873743007 DE3743007A1 (en) | 1987-12-18 | 1987-12-18 | METHOD FOR THE DIRECT REDUCTION OF IRON OXYGEN-CONTAINING MATERIALS IN THE ROTATING THREAD |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1033649A true CN1033649A (en) | 1989-07-05 |
| CN1016618B CN1016618B (en) | 1992-05-13 |
Family
ID=6342944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN88106723A Expired CN1016618B (en) | 1987-12-18 | 1988-09-16 | Process for directly reducing iron oxide-containing materials in rotary kiln |
Country Status (11)
| Country | Link |
|---|---|
| EP (1) | EP0321018B1 (en) |
| CN (1) | CN1016618B (en) |
| AU (1) | AU610957B2 (en) |
| BR (1) | BR8805650A (en) |
| DE (2) | DE3743007A1 (en) |
| ES (1) | ES2042722T3 (en) |
| GR (1) | GR3005903T3 (en) |
| IN (1) | IN169929B (en) |
| PT (1) | PT89252B (en) |
| TR (1) | TR23570A (en) |
| ZA (1) | ZA889414B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056886C (en) * | 1995-11-14 | 2000-09-27 | 金属还原流程有限公司 | Method of processing finely divided material incorporating metal based constituents |
| CN100398669C (en) * | 2005-05-10 | 2008-07-02 | 太原理工大学 | Method of manufacturing low carbon sponge iron using microwave vertical furnace |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| PL313585A1 (en) * | 1993-09-22 | 1996-07-08 | Rgc Mineral Sands Ltd | Roasting of titanium-bearing substances |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1542305A1 (en) * | 1965-06-23 | 1970-04-30 | Metallgesellschaft Ag | Process for carrying out endothermic reactions in a rotary kiln |
| FR1484260A (en) * | 1965-06-23 | 1967-06-09 | Metallgesellschaft Ag | Process for carrying out endothermic reactions in a rotating tube furnace |
| DE2905339A1 (en) * | 1979-02-13 | 1980-08-21 | Metallgesellschaft Ag | METHOD FOR PRODUCING STEEL |
-
1987
- 1987-12-18 DE DE19873743007 patent/DE3743007A1/en not_active Withdrawn
-
1988
- 1988-01-11 IN IN22/CAL/88A patent/IN169929B/en unknown
- 1988-09-16 CN CN88106723A patent/CN1016618B/en not_active Expired
- 1988-10-05 TR TR706/88A patent/TR23570A/en unknown
- 1988-11-02 BR BR888805650A patent/BR8805650A/en not_active IP Right Cessation
- 1988-12-01 DE DE8888202755T patent/DE3873051D1/en not_active Expired - Lifetime
- 1988-12-01 ES ES88202755T patent/ES2042722T3/en not_active Expired - Lifetime
- 1988-12-01 EP EP88202755A patent/EP0321018B1/en not_active Expired - Lifetime
- 1988-12-15 ZA ZA889414A patent/ZA889414B/en unknown
- 1988-12-16 PT PT89252A patent/PT89252B/en not_active IP Right Cessation
- 1988-12-16 AU AU26953/88A patent/AU610957B2/en not_active Ceased
-
1992
- 1992-10-08 GR GR920401646T patent/GR3005903T3/el unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1056886C (en) * | 1995-11-14 | 2000-09-27 | 金属还原流程有限公司 | Method of processing finely divided material incorporating metal based constituents |
| CN100398669C (en) * | 2005-05-10 | 2008-07-02 | 太原理工大学 | Method of manufacturing low carbon sponge iron using microwave vertical furnace |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0321018B1 (en) | 1992-07-22 |
| PT89252B (en) | 1993-07-30 |
| CN1016618B (en) | 1992-05-13 |
| AU610957B2 (en) | 1991-05-30 |
| IN169929B (en) | 1992-01-11 |
| GR3005903T3 (en) | 1993-06-07 |
| AU2695388A (en) | 1989-06-22 |
| PT89252A (en) | 1989-12-29 |
| BR8805650A (en) | 1989-07-18 |
| ZA889414B (en) | 1990-08-29 |
| ES2042722T3 (en) | 1993-12-16 |
| EP0321018A1 (en) | 1989-06-21 |
| DE3743007A1 (en) | 1989-06-29 |
| DE3873051D1 (en) | 1992-08-27 |
| TR23570A (en) | 1990-04-03 |
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| C13 | Decision | ||
| GR02 | Examined patent application | ||
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| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |