CN108977614A - A method of inhibiting splash converter smelting early period - Google Patents
A method of inhibiting splash converter smelting early period Download PDFInfo
- Publication number
- CN108977614A CN108977614A CN201810915920.4A CN201810915920A CN108977614A CN 108977614 A CN108977614 A CN 108977614A CN 201810915920 A CN201810915920 A CN 201810915920A CN 108977614 A CN108977614 A CN 108977614A
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- Prior art keywords
- rifle
- rifle position
- oxygen
- splash
- seconds
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- 238000003723 Smelting Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 9
- 239000001301 oxygen Substances 0.000 claims abstract description 41
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 41
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000007664 blowing Methods 0.000 claims abstract description 36
- 230000006837 decompression Effects 0.000 claims abstract description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 9
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 9
- 239000004571 lime Substances 0.000 claims description 9
- 229910000514 dolomite Inorganic materials 0.000 claims description 8
- 239000010459 dolomite Substances 0.000 claims description 8
- 241001417490 Sillaginidae Species 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 10
- 229910052742 iron Inorganic materials 0.000 abstract description 5
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 239000002893 slag Substances 0.000 description 7
- 239000010959 steel Substances 0.000 description 7
- 238000003756 stirring Methods 0.000 description 7
- 229910000831 Steel Inorganic materials 0.000 description 6
- 239000002184 metal Substances 0.000 description 6
- 229910052751 metal Inorganic materials 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 241001062472 Stokellia anisodon Species 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 230000000994 depressogenic effect Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000011017 operating method Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910000720 Silicomanganese Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000005574 cross-species transmission Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/40—Production or processing of lime, e.g. limestone regeneration of lime in pulp and sugar mills
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to pneumatic steelmaking fields, a kind of more particularly to method for inhibiting splash converter smelting early period, the following steps are included: 1) after smelting heat starts, oxygen rifle drops in furnace and opens oxygen blowing, whole rifle position blows according to high-low-low tendency within 3-4 minutes, and rifle position is reduced to normal smelting rifle position 1550-1650mm by 1800-1900mm, meanwhile oxygen pressure is promoted to 0.85-0.88MPa；2) blowing between 30 seconds 10 seconds to 4 points, starts to carry out operation variation, including mention rifle to 4 points；Charging；Decompression；3) after step 2) is completed, bottom blowing flow is improved；4) after all operations, rifle position is gradually reduced, mentions high oxygen pressure, restores bottom blowing flow, adjusts to step 2) and carry out the level before operation variation, then start to be smelted.This invention ensures that the stability reacted in converter smelting molten bath early period, avoid Primary period because metallurgical power foot excessively in molten bath or temperature rise the splash comparatively fast generated especially band iron smolder splash the problem of.
Description
Technical field
The invention belongs to pneumatic steelmaking field more particularly to a kind of methods for inhibiting splash converter smelting early period.
Background technique
Converter splash is the major reason for causing steel-making link metal loss.After tentatively starting because of initial smelting period scorification, gold
Belong to containing the gas largely generated from reaction in furnace in liquid, meanwhile, clinker and molten metal interface are simultaneously unintelligible, mix in slag
It is made of more metal, during reaction in furnace carries out, if splash occurs, causes largely to contain outside scum ejection furnace,
Cause metal loss.Initial smelting period bath temperature rise it is uneven, existing low temperature dead angle in high-temperature area collision process,
It will also result in splash early period.To solve the expulsion problem that initial smelting period frequently occurs, need to replace using a kind of novel operating method
Generation conventional smelting process, prevents the generation of splash early period.
Summary of the invention
To solve the above-mentioned problems, it is an object of the invention to provide a kind of methods for inhibiting splash converter smelting early period.This hair
It is bright that reaction in furnace Variation Features in 4-5 minutes are bessemerized by research, propose a kind of controlling party for inhibiting initial smelting period splash
Method ensure that the normal table of Primary period reaction in furnace, avoid because reaction in furnace early period is violent or temperature change is uneven
The splash of generation especially band iron expulsion problem.
The specific technical solution of the present invention is as follows:
The present invention provides a kind of control methods for inhibiting splash converter smelting early period, comprising the following steps:
1) after smelting heat starts, oxygen rifle drops in furnace and opens oxygen blowing, and whole rifle position is blown according to high-low-low tendency
It refines within 3-4 minutes, rifle position is reduced to by 1800-1900mm smelts rifle position 1550-1650mm, meanwhile, oxygen pressure is promoted to
0.85-0.88MPa；
2) when blowing was to 4 points and 10 seconds to 4 points and 30 seconds, starts to carry out operation variation, specifically include that
1. mentioning rifle: rifle position improves 200-300mm from rifle position is smelted, and reaches between 1750-1850mm, forms high rifle position soft blow
Atmosphere；
2. charging: dividing 2-3 batch, lime or unprocessed dolomite are added in furnace from feed bin, risen from early period after slag with suppressing
To the clinker of fire door；
3. decompression: after proposing rifle charging, moment is low by oxygen pressure drop, further alleviates the severe degree of reaction in furnace, mitigates
Top blast oxygen gives molten bath bring stirring power, and steel slag is promoted in furnace to restore calm state.
3) it after step 2) is completed, selects the bottom blowing of special setting to stir control switch by force, bottom blowing flow is improved, increase and
From in the stirring power of bottom blown gas, promoting CO, CO for reacting generation in molten steel2Equal gas overflowings, consolidate aforesaid operations effect.
4) after all operations, early period, splash was effectively suppressed, and gradually reduced rifle position, mentioned high oxygen pressure, restored bottom blowing
Flow adjusts to former normal level (step 2) and carries out the level before operation variation), then start to be smelted.Start conventional
Smelting operation.
Preferably, it is basic spacing that the step 1) rifle position, which is with 45-50mm according to high-low-low tendency, with oxygen blast
200-300m3, time 20-30 second is basic time spacing, and gradually multifrequency time reduces rifle position by a small margin.
Preferably, first lime, dolomite and ore are normally added by existing model during step 1) is middle, are fed
Amount view molten iron silicon content, slag charge additional amount is in 55-60%, and for ore additional amount in 25-30%, remainder is dolomite.
Preferably, the step 1) oxygen lance position and oxygen pressure need to all arrive at normal water before smelting 4 minutes
It is flat, it prevents from influencing subsequent operating effect due to a side is not achieved.
Preferably, step 2) rifle position promotion must control between 200-300mm, avoid improving and excessively cause clinker
TFe is increased；Lime or the control of unprocessed dolomite feeding quantity are in every batch of 300-500kg；Oxygen pressure moment need to be reduced to 0.65-
Between 0.75MPa.
Preferably, step 3) the bottom blowing flow need to be set in 600-800Nm3Between/h.
Preferably, step 4) gradually reduces rifle position, restores oxygen pressure, restores bottom blowing after splash is effectively controlled
Flow is adjusted to the time of former normal level and is controlled between 20-30 seconds, avoids restoring to influence very much operating effect fastly.
Preferably, adjusting described in step 4) to former normal level includes reducing rifle position as 1550-1650mm, is restored
Oxygen pressure is 0.85-0.88Mpa, and recovery bottom blowing flow is 320-460Nm3/h。
Existing operating process, mostly using several operations such as permanent rifle constant pressure, change rifle transformation, permanent rifle transformation, i.e., whole rifle position oxygen
Press motionless, rifle position oxygen pressure is all dynamic, and the motionless oxygen of rifle position presses.Several operations cannot effective stability contorting converter splash.
This operation actually combines Three models in one, gradually forces down in rifle position to normal rifle position, reaches the pass of silicomanganese oxidation
Key time point is carried out change rifle position, becomes oxygen press operation, and cooperated and stirred by force with material addition, bottom blowing, and smelting process can be made more steady
It is fixed, after inhibiting splash to occur, successively restore rifle position, oxygen pressure, charging, bottom blowing, after according to charging model manipulation to close to eventually
Point.Its core is that the series cooperation that the rifle position promotion before splash generation-oxygen pressure decrease-charging compacting-bottom blowing is stirred by force.
Compared with prior art, present invention has an advantage that
(1) initial smelting period solves rifle position in routine operation, oxygen pressure, charging nothing by proposing rifle-charging-decompression operation step
Splash caused by cooperation or cooperation order are incorrect controls unstable problem, quickly alleviates the violent of reaction in furnace variation
Degree forms soft blow atmosphere in the furnace under high rifle position, low oxygen pressure, and avoiding violent external force between slagformation period causes
Clinker splash spillover.
(2) effect is stirred by force by bottom blowing, consolidation proposes rifle-charging-decompression operation step effect, promotes in molten steel on gas
It is floating, and uniformly temperature early period, good molten steel movement flow field is formed, stability contorting ability is improved.
(3) through the invention, so that converter smelting splash early period especially band iron splash has been obtained effective control, reduce
Metal loss reduces converter steel technology, plays positive effect for the cost efficiency work of steelmaking process.Together
When, due to effectively reducing for spraying state, reduces the fume amount of initial smelting period generation, has ensured equipment and the safety of personnel,
Active influence is all had for safety and efforts at environmental protection.
Specific embodiment
The present invention is further explained in the light of specific embodiments.
Embodiment 1
1, preparation starts heat smelting production after converter is added steel scrap, is blended into molten iron.After equipment is provided with condition, drop
Rifle opens oxygen and starts to blow.Initial rifle position uses high rifle position 1850mm.It opens and blows 1 point head batch slag charge and ore are added after 30 seconds, wherein
3200kg is added in lime, and 1100kg is added in ore, and 1500kg is added in dolomite.
2, after starting blowing, until oxygen lance position is reduced to 1550mm, and oxygen pressure is promoted to 0.85- when blowing 3 minutes
Between 0.88Mpa, i.e., normally smelt horizontality.
3, when blowing was to 4 points and 15 seconds, rifle position 200mm to 1750mm is improved, lifting process need to ensure precision, in strict accordance with
The section 200-300mm carries out, and avoids being promoted excessively high；Then point 3 batches add in lime to furnace, every batch of 350kg, every batch of minor tick
10 seconds or so；It then quickly reduces oxygen and is depressed into 0.68Mpa, to realize the purpose for quickly slowing down reaction in furnace severe degree.
4, after mentioning rifle-charging-decompression operation and all terminating, using the auxiliary bottom blowing mode of special setting, bottom is improved
Wind drift amount is to 600Nm3/ h carries out bottom blowing and stirs by force, stirs the time by force 10 seconds.
5, reaction in furnace restores calm, and gradually reduces rifle position to 1550mm, and starts to feed according to model, meanwhile,
Restore bottom blowing flow to normal level.
Embodiment 2
1, preparation starts heat smelting production after converter is added steel scrap, is blended into molten iron.After equipment is provided with condition, drop
Rifle opens oxygen and starts to blow.Initial rifle position uses high rifle position 1800mm.It opens and blows 1 point head batch slag charge and ore are added after 30 seconds, wherein
3300kg is added in lime, and 1150kg is added in ore, and 1500kg is added in dolomite.
2, after starting blowing, until oxygen lance position is reduced to 1550mm, and oxygen pressure is promoted to 0.85- when blowing 3 minutes
Between 0.88Mpa, i.e., normally smelt horizontality.
3, when blowing was to 4 points and 15 seconds, rifle position 200mm to 1750mm is improved, lifting process need to ensure precision, in strict accordance with
The section 200-300mm carries out, and avoids being promoted excessively high；Then point 3 batches add in lime to furnace, every batch of 350kg, every batch of minor tick
10 seconds or so；It then quickly reduces oxygen and is depressed into 0.70Mpa, to realize the purpose for quickly slowing down reaction in furnace severe degree.
4, after mentioning rifle-charging-decompression operation and all terminating, using the auxiliary bottom blowing mode of special setting, bottom is improved
Wind drift amount is to 600Nm3/ h carries out bottom blowing and stirs by force, stirs the time by force 10 seconds.
5, reaction in furnace restores calm, and gradually reduces rifle position to 1550mm, and starts to feed according to model, meanwhile,
Restore bottom blowing flow to normal level.
Inventor fully takes into account operation between converter smelting 4-5 early period minutes and presses down to early period by combining production practices
The influence of splash effect processed carries out sequence of maneuvers to rifle position, oxygen pressure, charging, bottom blowing by changing original operating procedure, with
Reach Optimal Control effect.
It is first begin to a heat using the process according to the above control method and smelts and rifle position, the voltage-controlled system of oxygen exist
Then normal level carried out dynamic rifle, charging, decompression, big bottom blowing operation in 4-5 minutes slagformation period reaction violent periods.
Smelting process operator carries out system operatio, and after converter application, converter splash rate is reduced within 10%, the splash quantity of slag
Control the problem of avoiding because of metal loss caused by splash, reduces the loss of converter cost, together within 5.8kg/t
When, the stabilization of safety and equipment for environmental requirement and operator all has good effect.
It is the state of the art, details are not described herein again if there is the content not kept detailed accounts in this specification.
Certainly, the present invention can also there are many embodiments, without deviating from the spirit and substance of the present invention, are familiar with
Those skilled in the art can disclosure according to the present invention make various corresponding changes and modifications, but these it is corresponding change and
Deformation all should belong to scope of protection of the claims of the invention.
Claims (5)
1. a kind of method for inhibiting splash converter smelting early period, comprising the following steps:
1) after smelting heat starts, oxygen rifle drops in furnace and opens oxygen blowing, and whole rifle position is according to high-low-low tendency, and blowing is extremely
Within 3-4 minutes, rifle position is reduced to by 1800-1900mm smelts rifle position 1550-1650mm, meanwhile, oxygen pressure is promoted to 0.85-
0.88MPa；
2) when blowing was to 4 points and 10 seconds to 4 points and 30 seconds, start to carry out operation variation, comprising the following steps:
1. mentioning rifle: rifle position improves 200-300mm from rifle position is smelted, and reaches between 1750-1850mm, forms high rifle position soft blow atmosphere
It encloses；
2. charging: dividing 2-3 batch, lime or unprocessed dolomite are added in furnace from feed bin；
3. decompression: after proposing rifle charging, oxygen pressure drop is low；
3) after step 2) is completed, bottom blowing flow is improved；
4) after all operations, rifle position is gradually reduced, mentions high oxygen pressure, restores bottom blowing flow, adjusts to step 2) and grasped
Then level before changing starts to be smelted.
2. the method according to claim 1, wherein the step 1) rifle position according to high-low-low tendency be with
45-50mm is basic spacing, with oxygen blast 200-300m3, time 20-30 second is basic time spacing, and rifle position reduces.
3. the method according to claim 1, wherein the step 2) lime or the control of unprocessed dolomite feeding quantity exist
Every batch of 300-500kg；Oxygen pressure drop is down to 0.65-0.75MPa.
4. the method according to claim 1, wherein step 3) the bottom blowing flow is improved to 600-800Nm3/h。
5. the method according to claim 1, wherein step 4) adjusts to step 2) water carried out before operation variation
The flat time controlled at 20-30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915920.4A CN108977614B (en) | 2018-08-13 | 2018-08-13 | Method for inhibiting splashing in earlier stage of converter smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810915920.4A CN108977614B (en) | 2018-08-13 | 2018-08-13 | Method for inhibiting splashing in earlier stage of converter smelting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108977614A true CN108977614A (en) | 2018-12-11 |
| CN108977614B CN108977614B (en) | 2020-06-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810915920.4A Active CN108977614B (en) | 2018-08-13 | 2018-08-13 | Method for inhibiting splashing in earlier stage of converter smelting |
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| Country | Link |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699511A (en) * | 2019-09-27 | 2020-01-17 | 山东钢铁股份有限公司 | Method for smelting high-silicon molten iron |
| CN112143853A (en) * | 2020-10-13 | 2020-12-29 | 长春工业大学 | A method and system for splatter prediction and splatter suppression in AOD furnace smelting process |
| CN112280924A (en) * | 2020-10-10 | 2021-01-29 | 山东莱钢永锋钢铁有限公司 | Method for controlling temperature in converter smelting |
| CN113430327A (en) * | 2021-05-14 | 2021-09-24 | 阳春新钢铁有限责任公司 | Method for controlling splashing and slag overflowing of converter |
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| JPS57123913A (en) * | 1981-01-26 | 1982-08-02 | Nisshin Steel Co Ltd | Oxygen blowing method for converter |
| CN104250672A (en) * | 2014-05-29 | 2014-12-31 | 莱芜钢铁集团有限公司 | Efficient dephosphorization method of combined blown converter |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110699511A (en) * | 2019-09-27 | 2020-01-17 | 山东钢铁股份有限公司 | Method for smelting high-silicon molten iron |
| CN110699511B (en) * | 2019-09-27 | 2021-07-13 | 山东钢铁股份有限公司 | Method for smelting high-silicon molten iron |
| CN112280924A (en) * | 2020-10-10 | 2021-01-29 | 山东莱钢永锋钢铁有限公司 | Method for controlling temperature in converter smelting |
| CN112280924B (en) * | 2020-10-10 | 2022-03-08 | 山东莱钢永锋钢铁有限公司 | Method for controlling temperature in converter smelting |
| CN112143853A (en) * | 2020-10-13 | 2020-12-29 | 长春工业大学 | A method and system for splatter prediction and splatter suppression in AOD furnace smelting process |
| CN112143853B (en) * | 2020-10-13 | 2022-04-15 | 长春工业大学 | Splash forecasting and splash pressing method and system in AOD furnace smelting process |
| CN113430327A (en) * | 2021-05-14 | 2021-09-24 | 阳春新钢铁有限责任公司 | Method for controlling splashing and slag overflowing of converter |
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| CN108977614B (en) | 2020-06-16 |
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