CN106521071A - Gas-based vertical furnace and method for preparing sponge iron by means of cold consolidated pellets - Google Patents
Gas-based vertical furnace and method for preparing sponge iron by means of cold consolidated pellets Download PDFInfo
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- CN106521071A CN106521071A CN201611159462.3A CN201611159462A CN106521071A CN 106521071 A CN106521071 A CN 106521071A CN 201611159462 A CN201611159462 A CN 201611159462A CN 106521071 A CN106521071 A CN 106521071A
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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
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft 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
- C21B13/0086—Conditioning, transformation of reduced iron ores
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- General Life Sciences & Earth Sciences (AREA)
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- Manufacture Of Iron (AREA)
Abstract
The invention discloses a gas-based vertical furnace and method for preparing sponge iron by means of cold consolidated pellets. The gas-based vertical furnace overall comprises a feeding bin, multiple middle material tanks and a reduction bin, wherein the feeding bin communicates with each middle material tank through a middle material tank feed inlet, and each middle material tank communicates with the reduction bin through a reduction bin feed inlet. Meanwhile, the invention discloses the method for preparing the sponge iron by means of the gas-based vertical furnace. According to the gas-based vertical furnace and the method thereof, drying, preheating and reduction processes of the cold consolidated pellets are integrally completed in the feeding bin, the middle material tanks and the reduction bin of the gas-based vertical furnace, technological processes are greatly simplified, equipment needed in the preparation process of oxidized pellets or roasted pellets is saved, pressure which is borne by the cold consolidated pellets on the lower portion and is from vertical distance and friction which is borne by the cold consolidated pellets on the lower portion and is from surrounding pellets are reduced, the pellet pulverization rate is decreased, comprehensive energy consumption is reduced, the metallizing rate of the sponge iron is increased, and the production efficiency of the sponge iron is improved.
Description
Technical field
The present invention relates to metallurgical technology field, specifically, the present invention relates to be prepared the gas of sponge iron by cold bound pellet
Base shaft furnace and its method.
Background technology
Gas-based shaft kiln prepares sponge iron and adopts acid pellet or agglomerates for raw material, generally requires cold bound pellet Jing
Can enter in gas-based shaft kiln after crossing dry, roasting and cooling.Green-ball dry run is carried out in drying grate, and roasting is often being returned
Carry out in rotary kiln, be cooled in carrying out on central cooler.Gas-based shaft kiln prepares raw material that sponge iron adopted under room temperature or low temperature
Acid pellet, drying, roasting and cooling procedure that this is related to cold bound pellet, long flow path, equipment are complicated, cause substantial amounts of
Energy dissipation.
In recent years, there is patent report gas-based shaft kiln production sponge iron to be directly entered using cold bound pellet, greatly can contract
Short processes flow process, reduces energy dissipation.However, affecting gas base to erect as cold bound pellet itself has low intensity, easily crushes
The deficiency of stove bed permeability, and the commercial practice for producing sponge iron in gas-based shaft kiln using cold bound pellet rarely has report
Road, therefore sponge iron is prepared in gas-based shaft kiln using cold bound pellet remain a need for more practice and exploring.
The comprcssive strength that the cold bound pellet of different temperatures band and position can bear in gas-based shaft kiln is different.It is existing
Gas-based shaft kiln is vertical heater, and in stove, pelletizing bears from body and surrounding pelletizing the pressure and frictional force for bringing, and shaft furnace is higher,
In the stove pressure in vertical dimension and frictional force born by pelletizing is bigger.
The content of the invention
The problem of sponge iron presence is prepared for above-mentioned gas-based shaft kiln, the present invention proposes a kind of using cold bound pellet preparation
The gas-based shaft kiln of sponge iron and its method.Both technological process had been enormously simplify using the gas-based shaft kiln and method of the present invention, while
Comprehensive energy consumption has been saved, the production efficiency of sponge iron has been improve.
According to an aspect of the present invention, the present invention provides the gas-based shaft kiln that a kind of cold bound pellet prepares sponge iron, the gas
Base shaft furnace includes：
Feeding bin, which is located at the topmost of gas-based shaft kiln and has cavity, and feeding bin includes freezing off knot at the top of which
Pelletizing entrance and top gas outlet, the diapire of wherein feeding bin is convex taper, the bottom wall edge and side wall of feeding bin it
Between be provided with multiple middle batch can feeding mouths；
Multiple hollow middle batch cans, each middle batch can are connected with feeding bin by middle batch can feeding mouth, middle material
The diapire of tank is inclined-plane, and inclined-plane edge is gradually lowered towards the direction of the vertical centrage of gas-based shaft kiln；
Reduction storehouse, its roof are connected with the side wall of each middle batch can, and reduction storehouse has cavity and roof is convex
Taper, is provided with multiple reduction storehouses feeding mouth between the roof and its side wall that reduce storehouse, in the middle of reduction storehouse feeding mouth connection batch can and
Reduction storehouse, reduction storehouse also include once also Primordial Qi entrance, secondary reduction gas entrance and secondary reduction gas outlet, wherein, secondary
Primordial Qi entrance and secondary reduction gas outlet and circulation booster fan is provided with therebetween also；And
Sponge iron is exported, and which is located at reduction orlop end.
According to one embodiment of present invention, wherein top gas outlet, positioned at the top of feeding bin side wall, once goes back Primordial Qi
Entrance is located at the bottom of the side wall in reduction storehouse, and secondary reduction gas entrance is located at the bottom of the side wall in reduction storehouse and ratio is once reduced
The height of gas entrance is lower, and the outlet of secondary reduction gas is positioned at the middle part of reduction silo roof wall.
According to one embodiment of present invention, the quantity of middle batch can is not less than 2.
According to one embodiment of present invention, the corner angle of the taper formed by the diapire of feeding bin be 120 °～
170°。
According to one embodiment of present invention, the angle of inclined-plane and horizontal plane that the diapire of middle batch can is formed be 5 °～
30°。
According to one embodiment of present invention, the corner angle for reducing the taper that silo roof wall is formed is not more than 180 °.
According to a further aspect in the invention, the present invention also provides a kind of method that employing gas-based shaft kiln prepares sponge iron, should
Method comprises the following steps：
1) prepare cold bound pellet and cold bound pellet is added to by cold bound pellet entrance the feeding bin of gas-based shaft kiln
It is interior；
2) in the feeding bin using first gas from bottom to top to step 1) in the cold bound pellet that adds be dried；
3) by step 2) in the middle of dried cold bound pellet Jing batch can feeding mouth be transported in middle batch can, using from
Second gas on down are preheated to cold bound pellet in middle batch can, the cold bound pellet after being preheated and first
Gas；
4) by step 3) in preheating after cold bound pellet Jing reduction storehouse feeding mouth be transported to reduction storehouse in, cold bound pellet
There is reduction with the Jing secondary reduction gas that once also Primordial Qi and Jing secondary reduction gas entrances are passed through that once also Primordial Qi entrance is passed through
Reaction, generates sponge iron and second gas；
5) make step 4) in the sponge iron outlet at sponge iron Jing reduction orlop end that obtains discharge.
According to one embodiment of present invention, step 4) also include making the sponge iron of generation continue to fall and once reducing
There is further reduction reaction with secondary reduction gas between gas entrance and secondary reduction gas entrance.
According to one embodiment of present invention, step 1) in the moisture of prepared cold bound pellet be not more than
10%, and prepare the mode of cold bound pellet include disk pelletizing, to roll-in ball or compacting balling-up mode in one kind or several
Kind.
According to one embodiment of present invention, step 4) in once also the temperature of Primordial Qi is 850 DEG C～950 DEG C.
The cold bound pellet of the present invention prepares the gas-based shaft kiln of sponge iron and its method by the drying of cold bound pellet, preheating
Concentrate on reduction process and complete in gas-based shaft kiln feeding bin, middle batch can and reduction storehouse, enormously simplify technological process, save
Acid pellet or agglomerates preparation process equipment needed thereby.And feeding bin, middle batch can and reduction three, storehouse device are each other
It is relatively independent, reduce the pressure in vertical dimension and the friction from pelletizing around that bottom cold bound pellet is born
Power, reduces pelletizing pulverization rate, also a saving comprehensive energy consumption, improves degree of metalization and the production efficiency of sponge iron.
Description of the drawings
Fig. 1 is the schematic diagram of the gas-based shaft kiln that the cold bound pellet of the present invention prepares sponge iron；And
Fig. 2 is the schematic flow sheet of the method that the employing gas-based shaft kiln of the present invention is prepared sponge iron by cold bound pellet.
Specific embodiment
It should be appreciated that embodiments of the invention shown in the exemplary embodiment are merely illustrative.Although at this
Only minority embodiment is described in detail in bright, but those skilled in the art to be readily appreciated that and depart from the present invention in not essence
In the case of the teaching of theme, various modifications are feasible.Correspondingly, all such modifications should all be included in the present invention's
In the range of.Without departing from the spirit of the invention, can be to the design of following exemplary embodiment, operating condition and ginseng
Number etc. is made others and replaces, changes, changes and delete.
The cold bound pellet that the embodiment of the present invention is described referring to Fig. 1 prepares the gas-based shaft kiln of sponge iron.The gas base is erected
Stove generally includes feeding bin 100, multiple hollow middle batch cans 200 and reduction storehouse 300.
Feeding bin 100 is located at the topmost of gas-based shaft kiln and has cavity, and feeding bin 100 includes freezing off at the top of which
Balling group's entrance 110 and top gas outlet 130, the diapire of wherein feeding bin 100 is convex taper, the bottom of feeding bin 100
Multiple middle batch can feeding mouths 120 are provided between wall edge and its side wall.The drift angle of the taper formed by the diapire of feeding bin 100
Angle is 120 °～170 °, thereby assists in the extrorse middle batch can of cold bound pellet fallen on 100 diapire of feeding bin and enters
Material mouth 120 is moved.
Multiple hollow 200 in the vertical directions of middle batch can are totally located at the middle part of gas-based shaft kiln.Each middle batch can
Logical 200 centre batch can feeding mouths 120 excessively are connected with feeding bin 100, and the diapire of middle batch can 200 is inclined-plane, and the inclined-plane is along direction
The direction of the vertical centrage of gas-based shaft kiln is gradually lowered, and the angle of the inclined-plane and horizontal plane is 5 °～30 °, preferably 15 °～
25 °, the cold bound pellet for falling 200 diapire of middle batch can is thereby assisted in towards reduction storehouse feeding mouth (being detailed below) shifting
It is dynamic.
The roof in reduction storehouse 300 is located at the side wall inside gas-based shaft kiln with each middle batch can and is connected, and reduction storehouse 300 has
Cavity and roof are convex taper, and the corner angle of the taper is not more than 180 °, thus preferably in guiding reduction storehouse 300
Gas Jing secondary reductions gas outlet enter closed circuit.Multiple reduction storehouses are provided between the roof and its side wall in reduction storehouse 300
Feeding mouth 310, reduction storehouse feeding mouth 310 connect middle batch can 200 and reduction storehouse 300, and reduction storehouse 300 also includes once also Primordial Qi
Entrance 320, secondary reduction gas entrance 330 and secondary reduction gas outlet 340.Wherein, secondary reduction gas entrance 330 and it is secondary also
Primordial Qi outlet 340 is connected and is provided with therebetween circulation booster fan 350.Sponge iron is provided with the bottom in reduction storehouse 300 to go out
Mouth 360.
According to a particular embodiment of the invention, the quantity of middle batch can 200 is not less than 2.
When sponge iron is prepared using the gas-based shaft kiln of the present invention, cold bound pellet is passed through into cold bound pellet entrance first
110 are added in feeding bin 100.As the feeding bin 100 of gas-based shaft kiln is connected with multiple middle batch can 200 below, because
This, in middle batch can 200, the higher gas of temperature can be travelled up in feeding bin 100.Gas from bottom to top be added to
Cold bound pellet in feeding bin 100 contacts and which is dried.As the diapire of feeding bin 100 is convex taper,
Therefore, fall the cold bound pellet on diapire to move to feeding bin bottom wall edge, and then enter through middle batch can feeding mouth 120
Enter to middle batch can 200.In middle batch can 200, the gas for coming autoreduction storehouse 300 is contacted and right with the cold bound pellet for falling
Which is preheated.Cold bound pellet after preheating is snapped down to reduce storehouse feeding mouth 310 along the inclined plane shape diapire of middle batch can 200,
And Jing reduction storehouse feeding mouths 310 enter reduction storehouse 300.In reduction storehouse 300, the cold bound pellet after preheating is reduced with once
Reduction reaction is concurrently given birth in gas and the contact of secondary reduction gas, obtains sponge iron, and the final Jing of sponge iron reduces the sponge of 300 bottom of storehouse
Ferrum outlet 360 is discharged.Wherein, secondary reduction gas is to reduce portion gas in storehouse 300 after a front reduction reaction from secondary
The gas that also Primordial Qi outlet 340 is discharged and obtained after circulating booster fan 350 and pressurizeing.Afterwards secondary reduction gas is passed through
Secondary reduction gas entrance 330 is passed through the bottom in reduction storehouse 300.
Fig. 2 shows that the flow process of the method for being prepared sponge iron by cold bound pellet using the gas-based shaft kiln of the present invention is illustrated
Figure.The method that sponge iron is prepared by cold bound pellet using the present invention is illustrated with reference to Fig. 1 and with reference to Fig. 2.
In the step s 100, prepare cold bound pellet and cold bound pellet is added to into gas by cold bound pellet entrance 110
In the feeding bin 100 of base shaft furnace, the biodiversity content of prepared cold bound pellet is not more than 10%, and can be using circle
Disk pelletizing, to one or more in roll-in ball or compacting balling-up mode preparing cold bound pellet.
In step s 200, what is added in the interior first gas for utilizing from bottom to top of feeding bin 100 are to step S100 is cold
Agglomerated pellet is dried, and dried top gas Jing top gases outlet 130 is discharged, top gas temperature about 100 DEG C～300
℃。
In step S300, batch can feeding mouth 120 in the middle of dried cold bound pellet Jing in step S200 is transported to
In middle batch can 200, cold bound pellet is preheated in middle batch can 200 using second gas from bottom to top, obtained
Cold bound pellet and first gas after preheating, about 300 DEG C～700 DEG C of the temperature of the second gas in middle batch can 200.
In step S400, the cold bound pellet Jing reduction storehouse feeding mouths 310 after preheating in step S300 are transported to also
In former storehouse 300, cold bound pellet and Jing once also Primordial Qi and Jing secondary reduction gas entrances that once also Primordial Qi entrance 320 is passed through
There is reduction reaction in the 330 secondary reduction gas being passed through, generate sponge iron and second gas.Wherein, once go back H in Primordial Qi2And CO
The percentage ratio of cumulative volume be not less than 80%, about 850 DEG C～950 DEG C of its temperature.After reduction sponge iron temperature be 300 DEG C～
600℃。
In step S500, the sponge iron of sponge iron Jing reduction 300 bottom of storehouse obtained in making step S400 exports 360 rows
Go out.
According to a particular embodiment of the invention, when the temperature of second gas is more than 500 DEG C, the circulation of part second gas Jing
Booster fan 350 enters reduction 300 bottom of storehouse after pressurizeing, and is once going back Primordial Qi entrance 320 and secondary reduction gas entrance 330
Between reduction section drastic reduction is carried out to the sponge iron after reduction.About 300 DEG C of the temperature of the sponge iron after drastic reduction～
500℃.The volume of the also Primordial Qi being circulated accounts for the ratio of second gas and is not less than 30%.Will also Primordial Qi be circulated both can be with
The recycling of also Primordial Qi is realized, the content of toxic gas in top gas is reduced, while further can also carry out to sponge iron
Drastic reduction, improves the degree of metalization for generating sponge iron.
Further below in conjunction with specific embodiments illustrating the cold bound pellet method for preparing sponge iron of the present invention.
Embodiment one
The cold bound pellet of moisture 10% is added in gas-based shaft kiln feeding bin 100 by cold bound pellet entrance 110.
The cold bound pellet for adding is dried using first gas from bottom to top in feeding bin 100, dried top gas
Jing top gases outlet 130 is discharged, about 100 DEG C of top gas temperature.Batch can feeding mouth 120 in the middle of dried cold bound pellet Jing
It is transported in middle batch can 200, cold bound pellet is carried out in middle batch can 200 using second gas from bottom to top pre-
Heat, about 300 DEG C of the temperature of the second gas, the cold bound pellet and first gas after being preheated.Freezing off after by preheating
Balling group Jing reduction storehouse feeding mouths 310 are transported in reduction storehouse 300, and once also Primordial Qi entrance 320 is passed through cold bound pellet with Jing
The secondary reduction gas that once also Primordial Qi and Jing secondary reduction gas entrance 330 are passed through there is reduction reaction, generate sponge iron and the
Two gases.Wherein, once go back H in Primordial Qi2Percentage ratio with the cumulative volume of CO is 80%, about 850 DEG C of its temperature, sea after reduction
Continuous ferrum temperature is 300 DEG C.Finally discharge the sponge iron outlet 360 that the sponge iron Jing for obtaining reduces 300 bottom of storehouse.
The degree of metalization of sponge iron that the above-mentioned technical proposal of the present invention is obtained is adopted for 83.2%, and traditional handicraft is obtained
Sponge iron degree of metalization be 82.4%.
Embodiment two
The cold bound pellet of moisture 9% is added in gas-based shaft kiln feeding bin 100 by cold bound pellet entrance 110.
The cold bound pellet for adding is dried using first gas from bottom to top in feeding bin 100, dried top gas
Jing top gases outlet 130 is discharged, about 200 DEG C of top gas temperature.Batch can feeding mouth 120 in the middle of dried cold bound pellet Jing
It is transported in middle batch can 200, cold bound pellet is carried out in middle batch can 200 using second gas from bottom to top pre-
Heat, about 400 DEG C of the temperature of the second gas, the cold bound pellet and first gas after being preheated.Freezing off after by preheating
Balling group Jing reduction storehouse feeding mouths 310 are transported in reduction storehouse 300, and once also Primordial Qi entrance 320 is passed through cold bound pellet with Jing
The secondary reduction gas that once also Primordial Qi and Jing secondary reduction gas entrance 330 are passed through there is reduction reaction, generate sponge iron and the
Two gases.Wherein, once go back H in Primordial Qi2Percentage ratio with the cumulative volume of CO is 85%, about 900 DEG C of its temperature, sea after reduction
Continuous ferrum temperature is 400 DEG C.Finally discharge the sponge iron outlet 360 that the sponge iron Jing for obtaining reduces 300 bottom of storehouse.
The degree of metalization of sponge iron that the above-mentioned technical proposal of the present invention is obtained is adopted for 85.9%, and traditional handicraft is obtained
Sponge iron degree of metalization be 84.1%.
Embodiment three
The cold bound pellet of moisture 8% is added in gas-based shaft kiln feeding bin 100 by cold bound pellet entrance 110.
The cold bound pellet for adding is dried using first gas from bottom to top in feeding bin 100, dried top gas
Jing top gases outlet 130 is discharged, about 300 DEG C of top gas temperature.Batch can feeding mouth 120 in the middle of dried cold bound pellet Jing
It is transported in middle batch can 200, cold bound pellet is carried out in middle batch can 200 using second gas from bottom to top pre-
Heat, about 700 DEG C of the temperature of the second gas, the cold bound pellet and first gas after being preheated.Freezing off after by preheating
Balling group Jing reduction storehouse feeding mouths 310 are transported in reduction storehouse 300, and once also Primordial Qi entrance 320 is passed through cold bound pellet with Jing
The secondary reduction gas that once also Primordial Qi and Jing secondary reduction gas entrance 330 are passed through there is reduction reaction, generate sponge iron and the
Two gases.Wherein, once go back H in Primordial Qi2Percentage ratio with the cumulative volume of CO is 88%, about 950 DEG C of its temperature.Make the second gas
The secondary reduction gas outlet 340 of gas Jing reduction 300 roofs of storehouse of the 30% of body volume is discharged, afterwards by circulating booster fan
350 pressurizations, Jing secondary reduction gas entrance 330 enter the bottom in reduction storehouse 300.The sponge iron of whereabouts is once going back Primordial Qi entrance
There is further reduction reaction with secondary reduction gas between 320 and secondary reduction gas entrance 330, carry out drastic reduction.Depth
About 500 DEG C of the temperature of the sponge iron after reduction.The sponge iron Jing for obtaining finally is made to reduce the sponge iron outlet of 300 bottom of storehouse
360 discharge.
The degree of metalization of sponge iron that the above-mentioned technical proposal of the present invention is obtained is adopted for 89.5%, and traditional handicraft is obtained
Sponge iron degree of metalization be 87.3%.
The foregoing is only presently preferred embodiments of the present invention, not for limit the present invention practical range；If do not taken off
From the spirit and scope of the present invention, the present invention is modified or equivalent, all should be covered in the claims in the present invention
In the middle of protection domain.
Claims (10)
1. a kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron, it is characterised in that the gas-based shaft kiln includes：
Feeding bin, which is located at the topmost of gas-based shaft kiln and has cavity, and feeding bin includes the cold bound pellet at the top of which
Entrance and top gas outlet, the diapire of wherein feeding bin is convex taper, is set between the bottom wall edge of feeding bin and side wall
There are multiple middle batch can feeding mouths；
Multiple hollow middle batch cans, each middle batch can are connected with feeding bin by middle batch can feeding mouth, middle batch can
Diapire is inclined-plane, and the inclined-plane edge is gradually lowered towards the direction of the vertical centrage of gas-based shaft kiln；
Reduction storehouse, its roof are connected with the side wall of each middle batch can, and reduction storehouse has cavity and roof is convex taper,
Multiple reduction storehouses feeding mouth, batch can and reduction in the middle of reduction storehouse feeding mouth connection is provided between the roof and its side wall in reduction storehouse
Storehouse, reduction storehouse also include once also Primordial Qi entrance, secondary reduction gas entrance and secondary reduction gas outlet, wherein, secondary reduction
Gas entrance and secondary reduction gas outlet and it is provided with therebetween circulation booster fan；And
Sponge iron is exported, and which is located at reduction orlop end.
2. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that wherein：
The top gas outlet is positioned at the top of feeding bin side wall；
It is described that once also Primordial Qi entrance is located at the bottom of the side wall in reduction storehouse；
The secondary reduction gas entrance is located at the bottom of the side wall in reduction storehouse and once goes back the height of Primordial Qi entrance than described in more
It is low；And
The secondary reduction gas outlet is positioned at the middle part of the reduction silo roof wall.
3. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that the quantity of the middle batch can is not
Less than 2.
4. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that the diapire institute shape of the feeding bin
Into taper corner angle be 120 °～170 °.
5. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that the diapire shape of the middle batch can
Into the angle of inclined-plane and horizontal plane be 5 °～30 °.
6. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that what the reduction silo roof wall was formed
The corner angle of taper is not more than 180 °.
7. a kind of method that gas-based shaft kiln using as described in any one of claim 1-6 prepares sponge iron, it is characterised in that institute
The method of stating comprises the following steps：
1) prepare cold bound pellet and the cold bound pellet is added to by cold bound pellet entrance the feeding bin of gas-based shaft kiln
It is interior；
2) in the feeding bin using first gas from bottom to top to step 1) in the cold bound pellet that adds be dried；
3) by step 2) in the middle of dried cold bound pellet Jing batch can feeding mouth be transported in middle batch can, using from lower
On second gas cold bound pellet is preheated in middle batch can, the cold bound pellet and the first gas after being preheated
Body；
4) by step 3) in cold bound pellet Jing reduction storehouse feeding mouths after preheating be transported in reduction storehouse, cold bound pellet and Jing
There is reduction reaction in the secondary reduction gas that once also Primordial Qi and Jing secondary reduction gas entrances are passed through that once also Primordial Qi entrance is passed through,
Generate sponge iron and second gas；
5) make step 4) in the sponge iron outlet at sponge iron Jing reduction orlop end that obtains discharge.
8. the method for preparing sponge iron according to claim 7, it is characterised in that step 4) also include making the sponge of generation
Ferrum continues to fall and once also enters one with secondary reduction gas between Primordial Qi entrance and the secondary reduction gas entrance described
The reduction reaction of step.
9. the method for preparing sponge iron according to claim 7, it is characterised in that step 1) in prepared freeze off balling
The biodiversity content of group is not more than 10%, and prepare the mode of cold bound pellet include disk pelletizing, to roll-in ball or pressure
Make one or more in ball mode.
10. the method for preparing sponge iron according to claim 7, it is characterised in that step 4) in the once also temperature of Primordial Qi
Spend for 850 DEG C～950 DEG C.
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| CN201611159462.3A CN106521071A (en) | 2016-12-15 | 2016-12-15 | Gas-based vertical furnace and method for preparing sponge iron by means of cold consolidated pellets |
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| CN106755694A (en) * | 2017-03-24 | 2017-05-31 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
| CN106811564A (en) * | 2017-03-24 | 2017-06-09 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106755695A (en) * | 2017-03-24 | 2017-05-31 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
| CN106755694A (en) * | 2017-03-24 | 2017-05-31 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
| CN106811564A (en) * | 2017-03-24 | 2017-06-09 | 江苏省冶金设计院有限公司 | The waste-heat recovery device and gas-based shaft kiln of gas-based shaft kiln |
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