CN101319257B - Bottom blowing ventilating structure of combined-blowing revolving furnace - Google Patents
Bottom blowing ventilating structure of combined-blowing revolving furnace Download PDFInfo
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- CN101319257B CN101319257B CN2008103025096A CN200810302509A CN101319257B CN 101319257 B CN101319257 B CN 101319257B CN 2008103025096 A CN2008103025096 A CN 2008103025096A CN 200810302509 A CN200810302509 A CN 200810302509A CN 101319257 B CN101319257 B CN 101319257B
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Abstract
The invention discloses a bottom blowing gas-permeable structure of a combined blowing converter in the top and bottom combined blowing technical field and a production method thereof. The structure comprises a gas-permeable brick, and a gas outlet of the gas-permeable brick is overlapped with at least two gas-permeable protective layers formed by mending materials with different substances. The structure greatly decreases the erosive velocity of the gas-permeable brick and prolongs the service life of the gas-permeable brick. The production method for the structure comprises the steps that: a. after the gas outlet of the gas-permeable brick is eroded to form a pit, a mending material is filled into the pit and is solidified to form the first gas-permeable protective layer at the gas outlet of the gas-permeable brick; and b. after the first gas-permeable protective layer is eroded to form a pit, and a mending material with the other substance is filled into the pit and is solidified to form the second gas-permeable protective layer on the first gas-permeable protective layer. The method has the advantages of high efficiency and low cost. The structure and the production method areparticularly suitable for being applied to converters with low melting point furnace slag containing higher vanadium titanium or TFe.
Description
Technical field
The present invention relates to make steel Zhong Ding, end top-bottom blowing technical field, be specifically related to combined blown converter bottom blowing ventilating structure and preparation method thereof.
Background technology
Because steel-making by combined-blown converter or vanadium extraction have the excellent metallurgical effect, steel-making converter has generally adopted top, end top-bottom blowing technology both at home and abroad, and promptly top blowing oxygen, bottom blowing rare gas element add strong mixing, obtains the steel-smelting technology of high-quality molten steel.The key equipment of bottom blowing is furnace bottom air port or gas permeable brick (ventilated element).Along with the Application and Development of spattering the slag technology, converter lining life increases substantially, and the converter bottom-blown air brick is subjected to the strong souring of furnace high-temperature, strong oxidizing property liquid or gas, and be very restricted work-ing life.If effectively do not protect; gas permeable brick is shorter work-ing life; well below the actual use of converter furnace life; multiple blown converter is lower age; the converter intermediary and later stages under arms are in the pure top blast state steel-making down of no bottom blowing for a long time; the metallurgical effect of combined blown converter just can't embody, and causes tremendous loss.
Existing method of carrying out the bottom-blown air brick protection mainly contains two kinds.The one, adopt the slag slag to mend.A lot of producers have adopted this method, promptly utilize the converter finishing slag to be set in gas permeable brick pneumatic outlet position, reach the effect of protection gas permeable brick.This method has obtained certain effect, and increase the work-ing life of bottom-blown air brick, but still differs far away with converter lining life.The 2nd, adopt the method for making the metal mushroom head, promptly gas permeable brick is covered with a thick layer of slag or solid state slag iron, its shape relies on the slag or the slag iron protection gas permeable brick that cover as the mushroom head in the military service process of converter, improve its working life.After gas comes out from gas permeable brick, flow into the molten bath through the formed air flue of slag condensation process with the bubble of disperse shape, the uncertainty that the air flue direction forms in the invar slag is so be also referred to as the labyrinth type air feed.This method has obtained success in some producer, multiple blown converter is increased substantially age, slag slag attitude and appropriate bottom gas-feeding flow are facilitated preferably but this method needs, and the state of converter bottom gas-feeding and slag slag attitude come and go, different producer's slag slag attitude difference is also very big, particularly contain the higher low melting point converter stove slag of vanadium titanium or TFe, it is very fast to occur obstruction or melting loss easily, can't form this metal mushroom head, influence the gas supply flow of gas permeable brick, therefore the success ratio of this method is not high.
Summary of the invention
Technical problem solved by the invention is: a kind of combined blown converter bottom blowing ventilating structure that can effectively improve the gas permeable brick working life and preparation method thereof is provided.
The technical scheme that solves the problems of the technologies described above is: combined blown converter bottom blowing ventilating structure of the present invention, comprise gas permeable brick, and the gas outlet of gas permeable brick is stacked to be coated with the two-layer at least breathable protective layer that is formed by the mending material of different materials.
As the preferred version of technique scheme, protective layer is followed successively by the air-permeable material for repairing furnace bed of material and the magnesia mending material bed of material from the bottom to top, is provided with the ventilating pit of gas being imported molten steel in the magnesia mending material bed of material.
Further be to be coated with the slag protective layer on the magnesia mending material bed of material.
The making method of combined blown converter bottom blowing ventilating structure comprises the steps:
A, when the gas outlet of gas permeable brick corrode form pit after, in pit, fill mending material, mending material solidify to form the first layer breathable protective layer at the gas outlet of gas permeable brick;
B, after the first layer breathable protective layer corrode to form pit, in pit, fill up the mending material of another kind of material, mending material solidify to form second layer breathable protective layer on the first layer breathable protective layer.
As the preferred version of technique scheme, the mending material among the step a adopts air-permeable material for repairing furnace, and air-permeable material for repairing furnace solidifies the back and forms the air-permeable material for repairing furnace bed of material, and the gas supply flow when air-permeable material for repairing furnace solidifies in the gas permeable brick maintains 0～50Nm
3/ h; Mending material among the step b adopts magnesia mending material, and magnesia mending material solidifies the back and forms the magnesia mending material bed of material, and the gas supply flow when magnesia mending material solidifies in the gas permeable brick maintains 30～80Nm
3/ h.
Further be in step a, when the depth of erosion of pit reaches 100～300mm, in pit, to fill mending material; In step b, when the depth of erosion of pit reaches 50～150mm, in pit, fill mending material.
Further be after step b finishes, on second layer breathable protective layer, to cover the slag protective layer that solidify to form by slag.
Further be that when slag solidified, the gas supply flow in the gas permeable brick maintained 50～150Nm
3/ h.
Further be that periodically additional and curing slag makes the thickness of slag protective layer keep running balance.
Further be before step a, slag and magnesium lime mixture to be covered the gas outlet of gas permeable brick.
The invention has the beneficial effects as follows: the protective layer that is formed by the mending material of different materials has different characteristics according to the difference of material, the ability of the high temperature resistance that has, strong oxidizing property melt or gas pickling is stronger, but ventilation property is poor, blocks the pneumatic outlet of gas permeable brick easily; Though and the ventilation property that has is better, be difficult for to stop up, because of the ability of its antiscour, anti-slag action a little less than, melting loss easily in convertor steelmaking process.These protective layers can't effectively play the protection gas permeable brick to improve the purpose of gas permeable brick working life if use separately.Combined blown converter bottom blowing ventilating structure of the present invention is coated with the two-layer at least breathable protective layer that is formed by the mending material of different materials because of the gas outlet of its gas permeable brick is stacked; therefore the protection of gas permeable brick had both been combined the advantage of the mending material of every kind of material, and can make the mending material shortcoming of different materials obtain complementation again.Through evidence, after adopting combined blown converter bottom blowing ventilating structure of the present invention, the work-ing life of gas permeable brick can be from about original 1000～2000 stoves, bring up to more than 6000 stoves, greatly reduce the erosive velocity of gas permeable brick, prolong gas permeable brick work-ing life, improve the multiple blown converter of converter age, can realize that multiple blown converter age of converter and converter lining life are synchronous, embody the metallurgical effect that the full stove labour of combined blown converter is blown again.And combined blown converter bottom blowing ventilating structure of the present invention also has the obstruction of being difficult for, advantages such as good air permeability.
By the making method of combined blown converter bottom blowing ventilating structure of the present invention, make the two-layer at least breathable protective layer that forms by the mending material of different materials of the stacked covering of gas outlet of gas permeable brick, form multiple protective layer on gas permeable brick top.This method has efficiently, advantage cheaply.
Combined blown converter bottom blowing ventilating structure of the present invention and preparation method thereof especially is fit to be applied in as in the converter that contains the higher low-melting-point slag of vanadium titanium or TFe.
Description of drawings
Fig. 1 is the synoptic diagram of combined blown converter bottom blowing ventilating structure of the present invention.
Be labeled as among the figure: molten steel 1, ventilating pit 2, slag protective layer 3, converter lining 4, the air-permeable material for repairing furnace bed of material 5, gas permeable brick 6, tiny breather hole 7, the magnesia mending material bed of material 8.
Direction shown in the arrow is an air flow line among the figure.
Embodiment
The present invention is described further below in conjunction with drawings and Examples.
As Fig. 1, combined blown converter bottom blowing ventilating structure of the present invention comprises gas permeable brick 6, and the gas outlet of gas permeable brick 6 is stacked to be coated with the two-layer at least breathable protective layer that is formed by the mending material of different materials.The protective layer that is formed by the mending material of different materials has different characteristics according to the difference of material, and the ability of the high temperature resistance that has, strong oxidizing property melt or gas pickling is stronger, but ventilation property is poor, blocks the pneumatic outlet of gas permeable brick 6 easily; Though and the ventilation property that has is better, be difficult for to stop up, because of the ability of its antiscour, anti-slag action a little less than, melting loss easily in convertor steelmaking process.These protective layers can't effectively play protection gas permeable brick 6 to improve the purpose of gas permeable brick 6 working lives if use separately.Combined blown converter bottom blowing ventilating structure of the present invention is coated with the two-layer at least breathable protective layer that is formed by the mending material of different materials because of the gas outlet of its gas permeable brick 6 is stacked; therefore the protection of gas permeable brick 6 had both been combined the advantage of every kind of material, and can make the shortcoming of different materials obtain complementation again.Wherein, every layer of protective layer all is breathables, and the gas from the output of gas permeable brick 6 pneumatic outlets can be blown into molten steel through protective layer successively like this, realizes the function of bottom blowing.Make protective layer have the breathable characteristic, can select the protective layer that forms by the ventilation property material, also can in the protective layer of ventilation property difference, breather hole be set and realize.Combined blown converter bottom blowing ventilating structure of the present invention adopts the two-layer at least protective layer that is formed by the mending material of different materials to gas permeable brick 6 protection that superposes; can on gas permeable brick 6 pneumatic outlets, form multi-level stable protective layer; solve and to blow gas permeable brick 6 again and cannot say for sure a difficult problem of protecting; the erosive velocity or zero that reduces gas permeable brick 6 greatly corrodes, can be identical work-ing life with converter lining life.
As Fig. 1, as a kind of embodiment preferred, protective layer is followed successively by the air-permeable material for repairing furnace bed of material 5 and the magnesia mending material bed of material 8 from the bottom to top, is provided with the ventilating pit 2 of gas being imported molten steel in the magnesia mending material bed of material 8.What the air-permeable material for repairing furnace bed of material 5 adopted is air-permeable material for repairing furnace, air-permeable material for repairing furnace is the fettling material of the present routine of using, its maximum characteristics are to form a lot of tiny breather holes 7 in stove behind the sintering, therefore permeability is good, can not cause that gas permeable brick 6 stops up, but the ability of its antiscour, anti-slag action a little less than, easy melting loss in convertor steelmaking process.What the magnesia mending material bed of material 8 adopted is magnesia mending material; the characteristics of magnesia mending material are that the ability of high temperature resistance, strong oxidizing property melt or gas pickling is stronger; ventilation property is relatively poor; density is higher behind the sintering; can shorten its erosive velocity greatly, and the air-permeable material for repairing furnace bed of material 5 that can protect the bottom to form.With the air-permeable material for repairing furnace bed of material 5 protection gas permeable bricks 6 pneumatic outlet positions, it is unimpeded to guarantee that gas goes out gas permeable brick 6 back air-flows earlier for this scheme, unlikely obstruction, and certain anti-erosion effect is arranged; Form the magnesia mending material bed of material 8 of the stronger densification of corrosion resistance then with magnesia mending material, the protection air-permeable material for repairing furnace bed of material 5, thus effectively protect gas permeable brick 6, make gas permeable brick 6 keep long working life, and be difficult for stopping up good air permeability.
As Fig. 1, for the magnesia mending material bed of material 8 is protected, thereby further improve the working life of gas permeable brick, be coated with slag protective layer 3 on the magnesia mending material bed of material 8.What the material of slag protective layer 3 adopted is slag, has just formed slag protective layer 3 after slag solidifies.Slag protective layer 3 belongs to loose type, and ventilation property is better.Because slag protective layer 3 directly contacts with molten steel 1 or slag, fierce exchange of substance and heat exchange take place, so erosive velocity is very fast, must regular maintenance.Because it is material that slag protective layer 3 directly adopts slag; therefore its cost of keeping is very cheap; that so just the cycle of safeguarding can be set is more frequent; the magnesia mending material bed of material 8 of state protection with the thickness running balance all the time that guarantees slag protective layer 3 can be fixed up the magnesia mending material bed of material 8.
The maintaining method of combined blown converter bottom-blown air brick of the present invention comprises the steps:
A, when the gas outlet of gas permeable brick 6 corrode form pit after, in pit, fill mending material, mending material solidify to form the first layer breathable protective layer at the gas outlet of gas permeable brick 6;
B, after the first layer breathable protective layer corrode to form pit, in pit, fill up the mending material of another kind of material, mending material solidify to form second layer breathable protective layer on the first layer breathable protective layer.
As Fig. 1, gas permeable brick 6 is arranged in the converter lining 4, and gas is carried from the bottom to top.When just having begun to drop into STEELMAKING PRODUCTION after combined blown converter is built installation by laying bricks or stones, the pneumatic outlet of gas permeable brick 6 flushes substantially with the surface of converter lining 4.But along with the use of converter, gas permeable brick 6 is subjected to the erosion of washing away of high temperature, strong oxidizing property liquid or gas, and its gas outlet melts damage, descend highly gradually, and therefore the erosive velocity of converter lining 4 forms pit much smaller than gas permeable brick.After pit forms, in pit, fill mending material, mending material solidify to form the first layer breathable protective layer on the pneumatic outlet of gas permeable brick 6.The first layer protective layer is filled up pit, prevents that gas permeable brick 6 from contacting with molten steel 1, and that avoids gas permeable brick 6 further melts damage.After forming the first layer breathable protective layer; combined blown converter continues to come into operation; after using for some time; because the washing away of molten steel 3 and slag, erosion action; the pneumatic outlet of the first layer protective layer formation pit that is subjected to deteriorating; fill the mending material of another kind of material this moment in pit, mending material solidify to form second layer breathable protective layer on the first layer protective layer.Like this, make on the pneumatic outlet of gas permeable brick 6 from the bottom to top stack successively cover the breathable protective layer that two-layer at least difference is formed by the mending material of material, at gas permeable brick 6 tops formation multiple protective layer.Adopt aforesaid method the first layer protective layer and second layer protective layer can well be fixed, avoid protective layer to break away from gas permeable brick 6, make protective layer can be for a long time stable gas permeable brick 6 is protected.
Wherein, the mending material among the step a adopts air-permeable material for repairing furnace, and air-permeable material for repairing furnace solidifies the back and forms the air-permeable material for repairing furnace bed of material 5, and the gas supply flow when air-permeable material for repairing furnace solidifies in the gas permeable brick 6 maintains 0～50Nm
3/ h; Mending material among the step b adopts magnesia mending material, and magnesia mending material solidifies the back and forms the magnesia mending material bed of material 8, and the gas supply flow when magnesia mending material solidifies in the gas permeable brick 6 maintains 30～80Nm
3/ h.Keeping the purpose of certain gas supply flow in the mending material solidification process, is to guarantee to form naturally therein under the effect of air-flow when mending material solidifies gas channel.Gas supply flow when air-permeable material for repairing furnace solidifies in the gas permeable brick 6 can for zero be because the ventilation property of air-permeable material for repairing furnace after solidifying own with regard to reasonable cause.And magnesia mending material when solidifying the gas supply flow in the gas permeable brick 6 maintain 30～80Nm
3/ h like this, after magnesia mending material solidifies, just can form several ventilating pits 2 therein naturally.
In addition, in step a, when the depth of erosion of pit reaches 100～300mm, in pit, fill mending material; In step b, when the depth of erosion of pit reaches 50～150mm, in pit, fill mending material.Like this, the thickness of the air-permeable material for repairing furnace bed of material 5 is 100～300mm just, and the thickness of the magnesia mending material bed of material 8 just is 50～150mm.The thickness of the air-permeable material for repairing furnace bed of material 5 is thicker relatively, so the ventilation property of whole protecting layer just can be guaranteed.
For the magnesia mending material bed of material 8 is protected, after step b finishes, on second layer breathable protective layer, cover the slag protective layer 3 that solidify to form by slag.In order to make the slag protective layer 3 after the curing have air permeability and good, when slag solidified, the gas supply flow in the gas permeable brick 6 maintained 50～150Nm
3/ h.Because the erosive velocity of slag protective layer 3 is very fast, therefore, can periodically replenish and solidify slag and make the thickness of slag protective layer 3 keep running balance.
Because combined blown converter is built by laying bricks or stones when beginning to drop into STEELMAKING PRODUCTION after the installation, this moment, gas permeable brick top did not have slag blanket, be in naked state, be subjected to the erosion of washing away of high temperature, strong oxidizing property liquid or gas, the gas permeable brick melting loss is very fast, therefore can be before step a, slag and magnesium lime mixture can be covered the erosion rate that reduces gas permeable brick 6 on the pneumatic outlet of gas permeable brick 6.Adopt the erosion rate of the reduction gas permeable brick 6 that this method can be suitable, but be difficult to form permanently effective protection slag blanket.
Embodiment
The making method of combined blown converter bottom blowing ventilating structure, concrete steps are:
(1) combined blown converter (120 tons of nominal capacities; yearly capacity is 1,200,000) promptly begin to drop into STEELMAKING PRODUCTION after building installation by laying bricks or stones; this moment, gas permeable brick 6 tops did not have slag blanket; be in naked state; be subjected to the erosion of washing away of high temperature, strong oxidizing property liquid or gas; the gas permeable brick melting loss is very fast; must be according to the slag attitude situation of slag; stay 2～4t converter slag after adopting smelting; and add 300～800kg and contain magnesium lime, grate dross or be aided with and spatter slag operation, the protection gas permeable brick then; can suitably reduce the erosion rate of gas permeable brick 6, but be difficult to form permanently effective protection slag blanket.After described " grate dross " meaning was converter steelmaking, with molten steel after rolling, slag did not temporarily fall, and shakes converter then, made the interior slag of stove stick to furnace wall or gas permeable brick position, played the effect of protection converter lining 4 or gas permeable brick.After described " spattering slag operation " is meant that converter has gone out steel, wouldn't fall slag, and utilize oxygen rifle or special-purpose rifle that slag is blown N
2Gas splashes slag attached on the furnace wall, makes to form the certain thickness slag blanket that spatters on the furnace wall, plays the effect of protection converter lining 4, alleviates deteriorating of converter lining 4, prolongs the work-ing life of converter.
(2) form pit when the gas outlet of gas permeable brick 6 corrodes, when the depth of erosion of pit reached 100～300mm, the protective layer that begins to adopt the mending material by different materials to form carried out multilayer stack maintenance.At first treat to outwell slag after converter has gone out steel, and go out remaining molten steel to the greatest extent, then the gas supply flow of gas permeable brick 6 is transferred to 0～50Nm
3/ h, under the condition of higher fire box temperature, immediately a kind of air-permeable material for repairing furnace (has been obtained national patent, physical and chemical index sees Table 1) 1.0～2.5t pours converter into, the converter that rocks back and forth then allows air-permeable material for repairing furnace cover the gas outlet of gas permeable brick 6, fill up the erosive pit, form the air-permeable material for repairing furnace bed of material 5 after afterwards converter being rested on the position sintering 30～90min that waits to mend gas permeable brick, recover normal discharge and carry out STEELMAKING PRODUCTION again.
The maximum characteristics of this air-permeable material for repairing furnace are: in stove, form a lot of tiny breather holes 7 behind the sintering, so permeability is good, can cause that gas permeable brick stops up, but the ability of its antiscour, anti-slag action a little less than, melting loss easily in convertor steelmaking process.If only adopt this mending material to safeguard, then can not form nonvolatil gas permeable brick protective layer, this falls about 5～15 furnace foundations with regard to melting loss.
The special-purpose air-permeable material for repairing furnace physical and chemical index of table 1
(3) behind the formation air-permeable material for repairing furnace bed of material 5, the gas permeable brick gas supply flow is returned to normal blowing model air feed, converter begins steel-making, when smelting 2～10 stoves, because the washing away of molten steel 1 and slag, erosion action, the gas outlet of the air-permeable material for repairing furnace bed of material 5 formation pit that is subjected to deteriorating, when the degree of depth of deteriorating of pit reaches 50～150mm, carry out the fettling operation second time, that is: outwell slag after having gone out steel, go out remaining molten steel to the greatest extent, the gas supply flow of gas permeable brick 6 is transferred to 30～80Nm
3/ h, under the condition of higher fire box temperature, 1.0～2.5t pours converter into magnesia mending material (physical and chemical index sees Table 2), the converter that rocks back and forth then makes mending material cover the gas permeable brick place, fill up the erosive pit, form the magnesia mending material bed of material 8 after afterwards converter being rested on the position sintering 30～90min that waits to mend gas permeable brick, recover normal discharge and carry out STEELMAKING PRODUCTION again.
The characteristics of magnesia mending material are that the ability of high temperature resistance, strong oxidizing property melt or gas pickling is stronger; ventilation property is relatively poor; density is higher behind the sintering; can shorten its erosive velocity greatly; and the air-permeable material for repairing furnace bed of material that can protect the bottom to form; but under the effect of air-flow, can form 2～5 ventilating pits 2, guarantee the gas supply flow of gas permeable brick, be unlikely to stop up.The repairing of gas permeable brick can not all be repaired gas permeable brick with general magnesia mending material, otherwise gas communication is not smooth, occurs blocking the problem of gas permeable brick easily.
(4) the slag protective layer 3 that solidify to form by slag in the surface coverage of the magnesia mending material bed of material 8 then.Slag protective layer 3 be maintained as regular maintenance, can safeguard by every stove, also can safeguard by discontinuous, promptly by spattering slag or stay slag after the tapping, and the gas supply flow of gas permeable brick 6 is transferred to 50～150Nm
3/ h on gas permeable brick top, protects the slag cooled and solidified to the magnesia mending material bed of material 8.Because slag protective layer 3 directly contacts with molten steel 1 or slag; fierce exchange of substance and heat exchange take place; therefore erosive velocity is faster; necessary regular additional slag; make state that the thickness of this layer the is in running balance all the time magnesia mending material bed of material 8 of protection down, the magnesia mending material bed of material 8 can be fixed up.Slag protective layer 3 belongs to loose type, also forms gas passage under the air-flow effect easily, is difficult for stopping up gas permeable brick.
After by above maintaining method gas permeable brick 6 being implemented to safeguard, stratified, stable protective layer is formed on gas permeable brick 6 tops, the significant prolongation in work-ing life of gas permeable brick 6, even synchronous with converter lining life, and also gas permeable brick is not easy to stop up, and permeability is good.
One magnesia mending material physical and chemical index of table 2
| Project | MgO ％ | C* ％ | Compressive strength, 1500 ℃ * 3h of Mpa (burying carbon) | Refractoriness ℃ | Volume density g/cm 3 | Granularity mm |
| Index | ≥70.0 | ≥ 6.0 | ≥10 | ≥ 1790 | ≥2.4 | ≤ 12 |
Claims (8)
1. combined blown converter bottom blowing ventilating structure comprises gas permeable brick (6), it is characterized in that: the gas outlet of gas permeable brick (6) is stacked to be coated with the two-layer breathable protective layer that is formed by the mending material of different materials; Described protective layer is followed successively by the air-permeable material for repairing furnace bed of material (5) and the magnesia mending material bed of material (8) from the bottom to top, is provided with the ventilating pit (2) of gas being imported molten steel in the magnesia mending material bed of material (8).
2. combined blown converter bottom blowing ventilating structure as claimed in claim 1 is characterized in that: be coated with slag protective layer (3) on the magnesia mending material bed of material (8).
3. the making method of combined blown converter bottom blowing ventilating structure comprises the steps:
A, when the gas outlet of gas permeable brick (6) corrode form pit after, in pit, fill mending material, mending material solidify to form the first layer breathable protective layer at the gas outlet of gas permeable brick (6);
B, after the first layer breathable protective layer corrode to form pit, in pit, fill up the mending material of another kind of material, mending material solidify to form second layer breathable protective layer on the first layer breathable protective layer;
Wherein, the mending material among the step a adopts air-permeable material for repairing furnace, and air-permeable material for repairing furnace solidifies the back and forms the air-permeable material for repairing furnace bed of material (5), and the gas supply flow when air-permeable material for repairing furnace solidifies in the gas permeable brick (6) maintains 0～50Nm
3/ h; Mending material among the step b adopts magnesia mending material, and magnesia mending material solidifies the back and forms the magnesia mending material bed of material (8), and the gas supply flow when magnesia mending material solidifies in the gas permeable brick (6) maintains 30～80Nm
3/ h.
4. the making method of combined blown converter bottom blowing ventilating structure as claimed in claim 3 is characterized in that: in step a, when the depth of erosion of pit reaches 100～300mm, fill mending material in pit; In step b, when the depth of erosion of pit reaches 50～150mm, in pit, fill mending material.
5. as the making method of claim 3 or 4 described combined blown converter bottom blowing ventilating structures, it is characterized in that: after step b finishes, on second layer breathable protective layer, cover the slag protective layer (3) that solidify to form by slag.
6. the making method of combined blown converter bottom blowing ventilating structure as claimed in claim 5 is characterized in that: when slag solidified, the gas supply flow in the gas permeable brick (6) maintained 50～150Nm
3/ h.
7. the making method of combined blown converter bottom blowing ventilating structure as claimed in claim 5 is characterized in that: periodically additional and curing slag makes the thickness of slag protective layer (3) keep running balance.
8. the making method of combined blown converter bottom blowing ventilating structure as claimed in claim 3 is characterized in that: before step a, slag and magnesium lime mixture are covered the gas outlet of gas permeable brick (6).
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| CN2008103025096A CN101319257B (en) | 2008-07-03 | 2008-07-03 | Bottom blowing ventilating structure of combined-blowing revolving furnace |
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|---|---|---|---|
| CN2008103025096A CN101319257B (en) | 2008-07-03 | 2008-07-03 | Bottom blowing ventilating structure of combined-blowing revolving furnace |
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| CN101319257B true CN101319257B (en) | 2010-10-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101760579B (en) * | 2008-12-24 | 2015-04-01 | 攀钢集团钢铁钒钛股份有限公司 | Fettling method for vanadium extracting converter |
| CN102230055A (en) * | 2011-06-15 | 2011-11-02 | 邯郸开发区鑫福冶金科技有限公司 | Induction furnace capable of blowing inert gas towards inside of furnace |
| CN103014200B (en) * | 2012-03-27 | 2014-05-28 | 新疆八一钢铁股份有限公司 | Process applicable to transfer of molten steel slag of converter and optimization of treatment of hot smouldering slag |
| CN102888486A (en) * | 2012-09-17 | 2013-01-23 | 宣化钢铁集团有限责任公司 | Converter slag iron furnace protecting technology |
| CN103290167B (en) * | 2013-06-17 | 2015-01-28 | 武钢集团昆明钢铁股份有限公司 | Method for prolonging service life of top-bottom composite blowing converter bottom |
| CN111440917A (en) * | 2020-04-21 | 2020-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling uniform erosion of steel furnace bottom blowing bricks and furnace bottom |
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2008
- 2008-07-03 CN CN2008103025096A patent/CN101319257B/en not_active Expired - Fee Related
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