CN106676220A - Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof - Google Patents
Gas base shaft furnace for preparing sponge iron by cold-solidified pellets and method thereof Download PDFInfo
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- CN106676220A CN106676220A CN201611159784.8A CN201611159784A CN106676220A CN 106676220 A CN106676220 A CN 106676220A CN 201611159784 A CN201611159784 A CN 201611159784A CN 106676220 A CN106676220 A CN 106676220A
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- gas
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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
Abstract
The invention discloses a gas base shaft furnace for preparing sponge iron by cold-solidified pellets and a method thereof. The method comprises the following steps: 1) the cold-solidified pellets are prepared, and are added in a preheating section of the gas base shaft furnace; 2) hot gas is contacted with the added cold-solidified pellets in the preheating section of the gas base shaft furnace for drying and preheating the cold-solidified pellets; 3) combustion assisting gas is introduced, and is contacted with the gas from bottom to top for burning in a roasting section; and heat generated by burning heats and roasts the pellets to form high-temperature roasted pellets and hot gas; 4) the roasted pellets downwards fall to a reduction section by communicating holes, and generate a reduction reaction with primary reduction gas and secondary reduction gas to generate the sponge iron; and 5) the obtained sponge iron is discharged by a sponge iron outlet at the bottom end of the gas base shaft furnace. The gas base shaft furnace and the method save equipment needed by drying, roasting and cooling of the cold-solidified pellets, largely reduce the energy consumption, and promote great improvement of the reduction reaction efficiency.
Description
Technical field
The present invention relates to metallurgical technology field, specifically, the gas the present invention relates to prepare sponge iron by cold bound pellet
Base shaft furnace and its method.
Background technology
It is raw material that gas-based shaft kiln prepares sponge iron and uses acid pellet or agglomerates, generally requires to pass through cold bound pellet
Crossing after drying, be calcined and cooling down to enter in gas-based shaft kiln.Green-ball drying process is carried out in drying grate, and roasting is often being returned
Carried out in rotary kiln, be cooled in being carried out on central cooler.Gas-based shaft kiln prepares raw material that sponge iron used 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 is complicated.
In recent years, there is patent report to be directly entered gas-based shaft kiln production sponge iron using cold bound pellet, can greatly contract
Short processes flow, reduces energy dissipation.However, because there is low intensity, easily crushing and influenceing gas base to erect in cold bound pellet itself
The deficiency of stove bed permeability, and produce the commercial practice of sponge iron in gas-based shaft kiln using cold bound pellet and rarely have report
Road, therefore sponge iron is prepared in gas-based shaft kiln using cold bound pellet still need more practice and exploring.
Further, sea is prepared in gas-based shaft kiln using the acid pellet under room temperature or low temperature, agglomerates or cold bound pellet
The process of continuous iron has that pelletizing temperature is low so as to cause reduction efficiency not high.
The content of the invention
The problem of sponge iron presence is prepared for above-mentioned gas-based shaft kiln, the present invention proposes that one kind is prepared using cold bound pellet
The gas-based shaft kiln and its method of sponge iron.Cold bound pellet drying, roasting had both been saved using gas-based shaft kiln of the invention and method
Burn and equipment needed for cooling, significantly reduce energy dissipation, also improve gas-based shaft kiln reduction section temperature, ensuring that gas base is perpendicular
While stove is to acid pellet or the requirement of agglomerates compression strength, the significantly rising of reduction reaction efficiency is further promoted.
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, and it is special
Levy and be, shaft furnace includes：
Body of heater, it vertically extends, and body of heater is made up of upper and lower part, and upper and lower part is cavity structure and leads to
Intercommunicating pore connection is crossed, top is divided into preheating section and furnace zone, and preheating section is located at furnace zone top, and bottom includes reduction section；
Cold bound pellet entrance, it is located at body of heater upper end；
Top gas is exported, its preheating section for being located at body of heater；
Fuel gas inlet is helped, its furnace zone for being located at body of heater；
Primordial Qi entrance and secondary reduction gas entrance are once gone back, the two is respectively positioned on reduction section；
Secondary reduction gas export, it is located at reduction section and connect with secondary reduction gas entrance, secondary reduction gas outlet and
Circulation booster fan is provided between secondary reduction gas entrance；And
Sponge iron is exported, and it is located at body of heater bottom.
According to one embodiment of present invention, wherein, top gas outlet positioned at preheating section side top；Combustion-supporting gas enters
Mouth is located at the bottom of the side of furnace zone, and particular location is at the bottom-up 10cm~30cm in furnace zone bottom；Once go back Primordial Qi
Entrance is located at the bottom of the side of reduction section；Secondary reduction gas entrance is located at the bottom of the side of reduction section and ratio is once reduced
The height of gas entrance is lower；And the outlet of secondary reduction gas is positioned at the top of the side of reduction section.
Cold bound pellet of the invention prepares the gas-based shaft kiln of sponge iron by cold bound pellet drying and preheating, roasting process collection
In in gas-based shaft kiln complete, not only save equipment, and also avoid the energy dissipation that central cooler cooling procedure is brought.
According to another aspect of the present invention, the present invention also provides one kind and prepares sponge by cold bound pellet using gas-based shaft kiln
The method of iron, the method comprises the following steps：
1) prepare cold bound pellet and cold bound pellet is added in gas-based shaft kiln preheating section by cold bound pellet entrance；
2) fired section of hot gas from bottom to top is in gas-based shaft kiln preheating section and step 1) in add freeze off balling
Group's contact is simultaneously dried preheating to cold bound pellet；
3) through helping fuel gas inlet to be passed through combustion-supporting gas, combustion-supporting gas is contacted and in furnace zone burning, combustion with gas from bottom to top
The heat for producing is burnt to step 2) the middle agglomerates and hot gas for carrying out heating roasting by the pelletizing for preheating, forming high temperature
Body；
4) make step 3) agglomerates that are formed through dropping down onto reduction section under intercommunicating pore, agglomerates with through once and Primordial Qi enters
There is reduction reaction in the once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance that mouth is passed through, generate sponge iron；
5) make step 4) in the sponge iron that obtains export discharge through the sponge iron of gas-based shaft kiln bottom.
According to one embodiment of present invention, method also includes, step 4) in generation sponge iron continue under drop down onto once
Reduction section also between Primordial Qi entrance and secondary reduction gas entrance, and sent out with the secondary reduction gas being passed through through secondary reduction gas entrance
Raw secondary reduction reaction.
According to one embodiment of present invention, step 1) in the biodiversity content of prepared cold bound pellet be not more than
10%.
According to one embodiment of present invention, step 2) in heat gas temperature be 400 DEG C~700 DEG C.
According to one embodiment of present invention, combustion-supporting gas bag contains air and/or oxygen.
According to one embodiment of present invention, step 3) in the also gas temperature that is produced with combustion-supporting gas catalytic combustion of Primordial Qi be
900 DEG C~1200 DEG C.
According to one embodiment of present invention, step 3) in furnace zone reduction temperature degree be 700 DEG C~1200 DEG C.
According to one embodiment of present invention, step 4) in once also Primordial Qi temperature be 850 DEG C~950 DEG C, once also
Primordial Qi includes H2With CO and H2It is not less than 80% with total percent by volume of CO, secondary reduction temperature degree is 900 DEG C~1000
℃。
According to one embodiment of present invention, step 3) in roasting formed high temperature agglomerates temperature be 800 DEG C
~1000 DEG C, mean compressive strength is 1400~1500N/.
According to one embodiment of present invention, step 4) in reduction after sponge iron temperature be 600 DEG C~900 DEG C.
Use gas-based shaft kiln of the invention improves gas-based shaft kiln reduction section by the method that cold bound pellet prepares sponge iron
Temperature, it is ensured that gas-based shaft kiln is required acid pellet or agglomerates compression strength, while to reduction section agglomerates depth also
Original, degree of metalization higher has been obtained compared with traditional handicraft.Additionally, toxic gas content reduction in top gas, and temperature is relatively low,
Air and pollution-free can be discharged directly into.
Brief description of the drawings
Fig. 1 is the schematic diagram of the gas-based shaft kiln that cold bound pellet of the invention prepares sponge iron；And
Fig. 2 is the schematic flow sheet of the method that use gas-based shaft kiln of the 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 in this hair
Only a small number of embodiments have been 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 of the invention
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. makes others and replaces, changes, changes and delete.
The cold bound pellet for describing the embodiment of the present invention referring to Fig. 1 prepares the gas-based shaft kiln of sponge iron.The gas base is erected
Stove generally includes body of heater LT.Body of heater LT vertically extends, and body of heater LT is made up of upper and lower part, and upper and lower part is sky
Cavity configuration is simultaneously connected by intercommunicating pore 230, and top is divided into preheating section 100 and furnace zone 200, and preheating section 100 is located at furnace zone 200
Top, bottom includes reduction section 300.
Cold bound pellet entrance 110 is located at body of heater LT upper ends.Top gas outlet 120 is located at the preheating section 100 of body of heater LT, tool
Position is set to the top of the side of preheating section 100.Fuel gas inlet 210 is helped to be located at the furnace zone 200 of body of heater, particular location is roasting
At the section bottom-up 10cm~30cm in 200 bottoms.Once also Primordial Qi entrance 310 and secondary reduction gas entrance 320 are respectively positioned on reduction
300 bottoms of section, wherein secondary reduction gas entrance 320 are lower than the height of once also Primordial Qi entrance 310.Secondary reduction gas is exported
The top of 330 sides for being located at reduction section 300, and connects with secondary reduction gas entrance 320, secondary reduction gas outlet 330 with
Circulation booster fan 340 is provided between secondary reduction gas entrance 320.Sponge iron outlet 350 is located at body of heater bottom.
When preparing sponge iron using gas-based shaft kiln of the invention, cold bound pellet is passed through into cold bound pellet entrance first
110 are added in preheating section 100.The cold bound pellet for adding is preheated by the hot gas from bottom to top of furnace zone 200,
Furnace zone 200 is dropped down onto under cold bound pellet after preheating, due to being passed through combustion-supporting gas in furnace zone 200, therefore carrys out autoreduction
Section 300 also Primordial Qi and helps contacts fuel gas and burns, and the heat for producing that burns carries out heating roasting, shape to the pelletizing by preheating
Into the agglomerates and the gas of heat of high temperature.Agglomerates fall to falling reduction section 300 by intercommunicating pore 230.Agglomerates exist
Reduction section 300 obtains sponge iron with once also Primordial Qi and secondary reduction gas contact concurrently raw reduction reaction.Sponge iron is finally passed through
The sponge iron outlet 350 of the bottom of reduction section 300 is discharged.Wherein, secondary reduction gas is after a preceding reduction reaction in reduction section
Portion gas export discharge and the resulting gas after circulation booster fan 340 pressurizes from secondary reduction gas.Afterwards
Secondary reduction gas is passed through the bottom of reduction section 300 by secondary reduction gas entrance 320.During reduction reaction, roasting
Burn pelletizing temperature higher, reducing gas is heated, therefore, partial reduction gas is recycled both reduce in discharge gas and is had
Agglomerates can also be carried out drastic reduction by the content of poisonous gas using the hot secondary reduction gas.
Fig. 2 shows that the flow of the method that sponge iron is prepared by cold bound pellet using gas-based shaft kiln of the invention is illustrated
Figure.With reference to Fig. 1 and the explanation the method disclosed in the present of reference picture 2.
The method starts from step S100.In the step s 100, cold bound pellet is prepared and by cold bound pellet by freezing off
Balling group's entrance 110 is added in gas-based shaft kiln preheating section 100.The moisture of prepared cold bound pellet is not more than
10%.
In step s 200, fired section 200 hot gas from bottom to top is in gas-based shaft kiln preheating section 100 and step
The cold bound pellet contact added in S100 is simultaneously dried preheating to cold bound pellet, and the temperature of the gas of heat is 400 DEG C~
700℃。
In step S300, through helping fuel gas inlet 210 to be passed through combustion-supporting gas, combustion-supporting gas contacted with gas from bottom to top and
Furnace zone 200 burns, and the heat for producing that burns forms high temperature to carrying out heating roasting by the pelletizing of preheating in step S200
The gas of agglomerates and heat.Combustion-supporting gas bag contains air and/or oxygen, the gas temperature that also Primordial Qi is produced with combustion-supporting gas catalytic combustion
It is 900 DEG C~1200 DEG C to spend, and the reduction temperature degree of furnace zone is 700 DEG C~1200 DEG C.It is calcined the agglomerates of the high temperature for being formed
Temperature be 800 DEG C~1000 DEG C, mean compressive strength is 1400~1500N/.
In step S400, make the agglomerates that step S300 is formed through dropping down onto reduction section 300 under intercommunicating pore 230, be calcined
Pelletizing with through once also Primordial Qi and the secondary reduction being passed through through secondary reduction gas entrance 320 that once also Primordial Qi entrance 310 is passed through
There is reduction reaction in gas, generate sponge iron.Once also the temperature of Primordial Qi is 850 DEG C~950 DEG C, once reduces gas bag and contains H2And CO
And H2It is not less than 80% with total percent by volume of CO, secondary reduction temperature degree is 900 DEG C~1000 DEG C.Once go back Primordial Qi
With secondary reduction gas collective effect, realize reducing in reduction section, sponge iron temperature is 600 DEG C~900 DEG C after reduction.
In step S500, the sponge iron obtained in step S400 is set to export 350 rows through the sponge iron of gas-based shaft kiln bottom
Go out.
A specific embodiment of the invention, method also includes that the sponge iron generated in step S400 continues to fall
It is to reduction section once also between Primordial Qi entrance 310 and secondary reduction gas entrance 320 and logical with through secondary reduction gas entrance 320
There is secondary reduction reaction in the secondary reduction gas for entering.
Cold bound pellet of the invention prepares the gas-based shaft kiln of sponge iron by cold bound pellet drying and preheating, roasting process collection
In in gas-based shaft kiln complete, not only save equipment, and also avoid the energy dissipation that central cooler cooling procedure is brought.This
Invention improves gas-based shaft kiln reduction section temperature using gas-based shaft kiln by the method that cold bound pellet prepares sponge iron, is ensuring gas
While base shaft furnace is to acid pellet or the requirement of agglomerates compression strength, degree of metalization higher is obtained compared with traditional handicraft.
Additionally, toxic gas content reduction in top gas, and temperature is relatively low, can be discharged directly into air and pollution-free.
Embodiment one
The cold bound pellet of moisture 10% is added in gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110.
Fired section 200 from bottom to top 400 DEG C of hot gas is contacted in gas-based shaft kiln preheating section 100 with the cold bound pellet for adding
And preheating is dried to cold bound pellet, the top gas produced by preheating cold bound pellet is discharged through top gas outlet 120.Through
Fuel gas inlet 210 is helped to be passed through air as combustion-supporting gas, air themperature is room temperature, air is contacted simultaneously with reducing gas from bottom to top
Burnt in furnace zone 200, the temperature of the gas for producing that burns is 900 DEG C, the heat for producing that burns enters to the pelletizing by preheating
Row heating roasting, forms the agglomerates of high temperature and the gas of heat, and the temperature of the agglomerates of high temperature is 800 DEG C, in the step
Middle reduction temperature degree is 700 DEG C.Reduction section 300 is dropped down onto under the agglomerates of formation and is passed through with through once also Primordial Qi entrance 310
850 DEG C of once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance 320 there is reduction reaction, generate sponge
Iron, resulting sponge iron temperature is 600 DEG C, and gas bag is wherein once reduced in the step containing H2With CO and H2It is total with CO
Percent by volume is 80%.The sponge iron of generation is discharged through the sponge iron outlet 350 of gas-based shaft kiln bottom.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this hair
The compression strength of the agglomerates that bright above-mentioned technical proposal is obtained is 1432N/, and the degree of metalization of resulting sponge iron is
92.2%；And the compression strength of the agglomerates that traditional handicraft is obtained is 922N/, the degree of metalization of resulting sponge iron is
82.4%.Traditional handicraft is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the invention.
Embodiment two
The cold bound pellet of biodiversity content 9% is added into gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110
It is interior.Fired section 200 from bottom to top 600 DEG C of hot gas is in gas-based shaft kiln preheating section 100 and the cold bound pellet for adding
Contact and preheating is dried to cold bound pellet, the top gas produced by preheating cold bound pellet exports 120 rows through top gas
Go out.Through helping fuel gas inlet 210 to be passed through oxygen as combustion-supporting gas, oxygen temperature is room temperature, oxygen and reducing gas from bottom to top
Contact and burnt in furnace zone 200, the temperature of the gas for producing that burns is 1000 DEG C, the heat for producing that burns is to by preheating
Pelletizing carries out heating roasting, forms the agglomerates of high temperature and the gas of heat, and the temperature of the agglomerates of high temperature is 900 DEG C,
It is 900 DEG C that temperature degree is reduced in the step.Dropped down onto under the agglomerates of formation reduction section 300 and with through once also Primordial Qi entrance
There is reduction reaction in the once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance 320 of 310 900 DEG C for being passed through,
Generation sponge iron, resulting sponge iron temperature is 700 DEG C, and gas bag is wherein once reduced in the step containing H2With CO and H2With
Total percent by volume of CO is 83%.The sponge iron of generation is discharged through the sponge iron outlet 350 of gas-based shaft kiln bottom.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this hair
The compression strength of the agglomerates that bright above-mentioned technical proposal is obtained is 1544N/, and the degree of metalization of resulting sponge iron is
94.7%；And the compression strength of the agglomerates that traditional handicraft is obtained is 965N/, the degree of metalization of resulting sponge iron is
84.1%.Traditional handicraft is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the invention.
Embodiment three
The cold bound pellet of biodiversity content 8% is added into gas-based shaft kiln preheating section 100 by cold bound pellet entrance 110
It is interior.Fired section 200 from bottom to top 700 DEG C of hot gas is in gas-based shaft kiln preheating section 100 and the cold bound pellet for adding
Contact and preheating is dried to cold bound pellet, the top gas produced by preheating cold bound pellet exports 120 rows through top gas
Go out.Through helping fuel gas inlet 210 to be passed through oxygen as combustion-supporting gas, oxygen temperature is room temperature, oxygen and reducing gas from bottom to top
Contact and burnt in furnace zone 200, the temperature of the gas for producing that burns is 1200 DEG C, the heat for producing that burns is to by preheating
Pelletizing carries out heating roasting, forms the agglomerates of high temperature and the gas of heat, and the temperature of the agglomerates of high temperature is 1000 DEG C,
It is 1200 DEG C that temperature degree is reduced in the step.Dropped down onto under the agglomerates of formation reduction section 300 and with through once also Primordial Qi entrance
The secondary reduction gas of the once also Primordial Qi and be passed through through secondary reduction gas entrance 320 1000 DEG C of 310 950 DEG C for being passed through occurs also
Original reaction, generates sponge iron, and resulting sponge iron temperature is 700 DEG C, and gas bag is wherein once reduced in the step containing H2And CO
And H2It is 85% with total percent by volume of CO.The sponge iron of generation drops down onto once also Primordial Qi entrance 310 and two under continuing
Reduction section between secondary also Primordial Qi entrance 320, and sent out with the secondary reduction gas of 1000 DEG C be passed through through secondary reduction gas entrance 320
Raw secondary reduction reaction, obtains the sponge iron of drastic reduction, and the sponge iron exports 350 rows through the sponge iron of gas-based shaft kiln bottom
Go out.
Technological parameter and testing result using this method and traditional handicraft is as shown in table 1.As shown in Table 1, using this hair
The compression strength of the agglomerates that bright above-mentioned technical proposal is obtained is 1712N/, and the degree of metalization of resulting sponge iron is
96.5%；And the compression strength of the agglomerates that traditional handicraft is obtained is 1041N/, the degree of metalization of resulting sponge iron
It is 87.3%.Traditional work is significantly better than that using the compression strength and degree of metalization obtained by above-mentioned technical proposal of the invention
Skill.
The technological parameter and testing result of the method for the present invention of table 1 and traditional handicraft
Presently preferred embodiments of the present invention is the foregoing is only, not for limiting practical range of the invention；If do not taken off
From the spirit and scope of the present invention, the present invention is modified or equivalent, all should 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 shaft furnace includes：
Body of heater, it vertically extends, and body of heater is made up of upper and lower part, and upper and lower part is cavity structure and by connecting
Through hole is connected, and top is divided into preheating section and furnace zone, and preheating section is located at furnace zone top, and bottom includes reduction section；
Cold bound pellet entrance, it is located at body of heater upper end；
Top gas is exported, its preheating section for being located at the body of heater；
Fuel gas inlet is helped, its furnace zone for being located at the body of heater；
Primordial Qi entrance and secondary reduction gas entrance are once gone back, the two is respectively positioned on reduction section；
Secondary reduction gas export, it is located at reduction section and connect with secondary reduction gas entrance, secondary reduction gas export with it is secondary
Also circulation booster fan is provided between Primordial Qi entrance；And
Sponge iron is exported, and it is located at body of heater bottom.
2. the gas-based shaft kiln for preparing sponge iron according to claim 1, it is characterised in that wherein：
Top of the top gas outlet positioned at the side of the preheating section；
The bottom of the side for helping fuel gas inlet to be located at furnace zone；
It is described that once also Primordial Qi entrance is located at the bottom of the side of reduction section；
The secondary reduction gas entrance is located at the bottom of the side of reduction section and the height of Primordial Qi entrance is once gone back than described in more
It is low；And
Top of the secondary reduction gas outlet positioned at the side of the reduction section.
3. the method that a kind of use gas-based shaft kiln as claimed in claim 1 or 2 is prepared sponge iron by cold bound pellet, its feature
It is that methods described comprises the following steps：
1) prepare cold bound pellet and the cold bound pellet is added in gas-based shaft kiln preheating section by cold bound pellet entrance；
2) fired section of hot gas from bottom to top is in gas-based shaft kiln preheating section and step 1) in add cold bound pellet connect
Touch and preheating is dried to cold bound pellet；
3) through helping fuel gas inlet to be passed through combustion-supporting gas, the combustion-supporting gas is contacted and in furnace zone burning, combustion with gas from bottom to top
The heat for producing is burnt to step 2) the middle agglomerates and hot gas for carrying out heating roasting by the pelletizing for preheating, forming high temperature
Body；
4) make step 3) agglomerates that are formed through dropping down onto reduction section under intercommunicating pore, agglomerates with through once also Primordial Qi entrance leads to
There is reduction reaction in the once also Primordial Qi and the secondary reduction gas being passed through through secondary reduction gas entrance for entering, generate sponge iron；
5) make step 4) in the sponge iron that obtains export discharge through the sponge iron of gas-based shaft kiln bottom.
4. the method for preparing sponge iron according to claim 3, it is characterised in that methods described also includes, step 4) in
The sponge iron of generation drops down onto reduction section once also between Primordial Qi entrance and secondary reduction gas entrance under continuing, and is gone back with through secondary
There is secondary reduction reaction in the secondary reduction gas that Primordial Qi entrance is passed through.
5. the method for preparing sponge iron according to claim 3, it is characterised in that step 1) in prepared freeze off balling
The biodiversity content of group is not more than 10%.
6. the method for preparing sponge iron according to claim 3, it is characterised in that step 2) in the temperature of gas of heat be
400 DEG C~700 DEG C.
7. the method for preparing sponge iron according to claim 3, it is characterised in that the combustion-supporting gas bag containing air and/or
Oxygen.
8. the method for preparing sponge iron according to claim 3, it is characterised in that step 3) in also Primordial Qi connect with combustion-supporting gas
The gas temperature for touching burning generation is 900 DEG C~1200 DEG C.
9. the method for preparing sponge iron according to claim 3, it is characterised in that step 3) in furnace zone reduction temperature
Spend is 700 DEG C~1200 DEG C.
10. the method for preparing sponge iron according to claim 3, it is characterised in that step 4) in the once also temperature of Primordial Qi
It is 850 DEG C~950 DEG C to spend, and once reduces gas bag and contains H2With CO and H2It is not less than 80% with total percent by volume of CO, it is secondary
Reduction temperature degree is 900 DEG C~1000 DEG C.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111270038A (en) * | 2020-04-05 | 2020-06-12 | 上海泰普星坦新材料有限公司 | Moving bed reaction furnace for producing sponge iron by gas-based direct reduction |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
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| CN201589515U (en) * | 2009-11-25 | 2010-09-22 | 杨光 | Roasting reduction shaft furnace |
| CN103205561A (en) * | 2013-03-18 | 2013-07-17 | 酒泉钢铁(集团)有限责任公司 | Coal-based magnetic roasting method for powdery refractory low-grade iron ore carbon-bearing pellets by pellet shaft furnace |
| CN103667678A (en) * | 2013-12-05 | 2014-03-26 | 北京神雾环境能源科技集团股份有限公司 | Roasting technology of vanadium titano-magnetite oxidized pellet for shaft furnace |
| CN103805771A (en) * | 2014-02-25 | 2014-05-21 | 郭世宏 | Method for producing iron from sulfuric acid residue |
| CN104293998A (en) * | 2014-07-18 | 2015-01-21 | 北京神雾环境能源科技集团股份有限公司 | Method and system of preparing spongy iron by using gas-based shaft furnace |
| CN206385187U (en) * | 2016-12-15 | 2017-08-08 | 江苏省冶金设计院有限公司 | A kind of cold bound pellet prepares the gas-based shaft kiln of sponge iron |
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| CN111270038A (en) * | 2020-04-05 | 2020-06-12 | 上海泰普星坦新材料有限公司 | Moving bed reaction furnace for producing sponge iron by gas-based direct reduction |
| CN114107591A (en) * | 2021-11-26 | 2022-03-01 | 钢铁研究总院 | Heating-pure hydrogen reduction cooling system and method |
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