CN114085943A - Production method of plain carbon steel based on converter slag retention - Google Patents
Production method of plain carbon steel based on converter slag retention Download PDFInfo
- Publication number
- CN114085943A CN114085943A CN202111393313.4A CN202111393313A CN114085943A CN 114085943 A CN114085943 A CN 114085943A CN 202111393313 A CN202111393313 A CN 202111393313A CN 114085943 A CN114085943 A CN 114085943A
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- Prior art keywords
- converter
- slag
- steel
- blowing
- lime
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- 239000002893 slag Substances 0.000 title claims abstract description 67
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 22
- 229910000975 Carbon steel Inorganic materials 0.000 title claims abstract description 18
- 230000014759 maintenance of location Effects 0.000 title claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 68
- 239000010959 steel Substances 0.000 claims abstract description 68
- 238000007664 blowing Methods 0.000 claims abstract description 52
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 40
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 35
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 35
- 239000004571 lime Substances 0.000 claims abstract description 35
- 239000004575 stone Substances 0.000 claims abstract description 22
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 20
- 239000010459 dolomite Substances 0.000 claims abstract description 20
- 229910052742 iron Inorganic materials 0.000 claims abstract description 20
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 14
- 239000001301 oxygen Substances 0.000 claims abstract description 14
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 238000010438 heat treatment Methods 0.000 claims abstract description 10
- 238000010079 rubber tapping Methods 0.000 claims abstract description 10
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 6
- 239000007789 gas Substances 0.000 claims description 28
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 229910052799 carbon Inorganic materials 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 6
- 239000012159 carrier gas Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 3
- 229910052786 argon Inorganic materials 0.000 claims description 3
- 238000005261 decarburization Methods 0.000 claims description 3
- 230000008520 organization Effects 0.000 claims description 3
- 229910052717 sulfur Inorganic materials 0.000 claims description 3
- 239000011593 sulfur Substances 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- 238000003756 stirring Methods 0.000 claims description 2
- 235000010855 food raising agent Nutrition 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000033228 biological regulation Effects 0.000 description 2
- 238000007670 refining Methods 0.000 description 2
- 239000010962 carbon steel Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 239000002699 waste material 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
- C21C5/36—Processes yielding slags of special composition
-
- 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 discloses a method for producing plain carbon steel based on converter slag retention, which comprises the following steps: 1) the former converter produces slag; 2) blowing into slag in a converter: the converter adopts a structure that blowing equipment is arranged at the bottom to form top blowing and bottom blowing; 3) controlling the oxygen content and the molten steel temperature at the end point of the converter; 4) tapping molten steel from the previous converter, and leaving all or part of steel slag of the converter in the converter after slag adjustment and slag splashing; 5) heating the converter in the latter step before smelting molten steel, namely adding 6-8kg of heating agent per ton of steel into the converter; 6) controlling the addition amount of lime, dolomite and stones; 7) carrying out converter blowing, controlling the end point oxygen content and the molten steel temperature, and carrying out deslagging, slag retention and steel tapping; the converter slag-remaining smelting of the invention greatly reduces the consumption of lime, dolomite and stones, reduces the smelting cost, can solve the splashing problem during molten iron mixing, is beneficial to initial slagging and dephosphorization, reduces the pressure of dephosphorization in front of the converter, and improves the service life of a furnace lining and the service life of a steel tapping hole.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for producing plain carbon steel based on converter slag retention.
Background
At present, the average block ash + stone consumption of converter plain carbon steel production is 43.6 kg/ton steel. However, under the current increasingly severe environment-friendly form, the consumption of the block ash and the stones still causes great pressure on the cost of plain carbon steel and environmental governance. The steel slag is directly poured out, so that the waste of energy and heat is caused, the temperature needs to be raised again in the next converter smelting, and the production efficiency is low. Blowing and refining are stopped when slag is poured, so that the production rhythm is influenced, and efficient smelting is difficult to realize. Therefore, a method for producing the plain carbon steel based on the converter slag retention is urgently needed to solve the problems of high lime and stone consumption and low production efficiency in the conventional converter plain carbon steel production.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a method for producing plain carbon steel based on converter slag.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for producing plain carbon steel based on converter slag retention comprises the following steps:
1) and (3) slagging in the previous converter production: the proportion of the added molten iron is 86-89%, and the adding amount of lime, dolomite and stones is controlled;
2) blowing into slag in a converter: the converter adopts a structure combining top blowing and bottom blowing by installing blowing equipment at the bottom, carries lime, dolomite and stone slagging materials, and rapidly forms slag at the initial stage;
3) controlling the oxygen content and the molten steel temperature at the end point of the converter, controlling the oxygen content of the molten steel at the end point of the converter to be 800-1000 ppm, and controlling the temperature of the molten steel at the end point of the converter to be 1690-1720 ℃;
4) tapping molten steel from the previous converter, and leaving all or part of steel slag of the converter in the converter after slag adjustment and slag splashing;
5) heating the next converter before smelting the molten steel, and in order to reach the temperature of the molten iron as soon as possible, adding 6-8kg of heating agent per ton of steel into the converter, and controlling the temperature of the molten iron to be not lower than 1400 ℃;
6) controlling the addition amount of lime, dolomite and stones, wherein the addition amount of lime is controlled to be 38-45 kg/ton steel, the addition amount of dolomite is controlled to be 17-20 kg/ton steel, and the addition amount of stones is controlled to be 41-46 kg/ton steel;
7) and (4) carrying out converter blowing, controlling the end point oxygen content and the molten steel temperature, and carrying out deslagging, slag retention and tapping.
Specifically, the temperature of the molten iron in the step 1 is not lower than 1400 ℃, the sulfur content in the desulfurized molten iron is lower than 0.002%, the addition amount of lime is 41-48 kg/ton steel, the addition amount of dolomite is 20-23 kg/ton steel, and the addition amount of pebbles is 39-44 kg/ton steel.
Specifically, the blowing equipment in the step 2 takes the central line of the converter as an axis, a special ventilating blowing element is annularly arranged at the bottom of the converter, and a bottom connecting pipeline adopts a wear-resistant conveying pipeline; the conveying pipeline is connected with a gas switching valve, the switching valve is used for switching bottom blowing gas and lime carried by fluidized high-pressure carrier gas, the converter is added with molten iron, the furnace body is straightened by shaking, the top blowing organization oxygen blowing operation is descended, a first batch of slag making materials are added, simultaneously the bottom blowing of the converter gas is started, the converter gas is switched into the high-pressure fluidized gas carrying the lime by the switching valve after the top blowing is carried out for 2-3 min, the high-pressure fluidized gas gradually enters the decarburization period, and the lime is fully decomposed into CaO and CO2，CO2Effectively reacting with carbon in the molten steel to generate CO gas, and further stirring the molten pool; and after switching, controlling the blowing time to be 4-8min, and switching to a later argon blowing mode.
Specifically, the gas supply pressure of the lime-carrying carrier gas is 0.8-1.8 MPa, and the gas is supplied in the blowing processThe gas strength is 0.04-0.1M3The amount of lime carried is 3-7 kg/t.min.
Specifically, the slag regulation in the step 4 is to add 12 kg/ton of steel slag thickening agent after the steel is discharged from the converter, then lift the rear end of the converter to splash slag, and leave all the steel slag in the converter after the slag splashing is finished.
Specifically, the heating agent in the step 5 is fixed carbon, the adding amount of each time is controlled to be 550-650 kg, and the batch adding time interval is more than 30 seconds.
The invention has the following beneficial effects:
the invention designs a common carbon steel production method based on converter slag retention
(1) The consumption of lime, dolomite and stones is greatly reduced by the converter slag-remaining smelting, and the smelting cost is reduced;
(2) the slag remaining operation of the converter can solve the splashing problem during molten iron mixing as long as the temperature of the slag and the content of FeO in the slag are controlled;
(3) the slag remaining operation of the converter is beneficial to initial slagging and dephosphorization, reduces the pressure of dephosphorization in front of the converter, and reduces the consumption of ton steel lime and steel materials with considerable economic benefit;
(4) according to the analysis of test results, the slag remaining method has obvious effect under the existing smelting conditions, and the corrosion to the furnace lining can be reduced because the initial slag alkalinity is increased and the carbon drawing is high at the end point, thereby prolonging the service life of the furnace lining and prolonging the service life of a steel tapping hole.
Detailed Description
The technical scheme in the embodiment of the invention is clearly and completely further detailed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
A method for producing plain carbon steel based on converter slag retention comprises the following steps:
1) and (3) slagging in the previous converter production: the proportion of the added molten iron is 86-89%, and the adding amount of lime, dolomite and stones is controlled; the temperature of molten iron is not lower than 1400 ℃, the sulfur content in the desulfurized molten iron is lower than 0.002 percent, the addition amount of lime is 41-48 kg/ton steel, the addition amount of dolomite is 20-23 kg/ton steel, and the addition amount of stones is 39-44 kg/ton steel.
2) Blowing into slag in a converter: the converter adopts a structure combining top blowing and bottom blowing by installing blowing equipment at the bottom, carries lime, dolomite and stone slagging materials, and rapidly forms slag at the initial stage; the blowing equipment takes the central line of the converter as an axis, a special ventilating blowing element is annularly arranged at the bottom of the converter, and a bottom connecting pipeline adopts a wear-resistant conveying pipeline; the conveying pipeline is connected with a gas switching valve, the switching valve is used for switching bottom blowing gas and lime carried by fluidized high-pressure carrier gas, molten iron is added into the converter, the converter body is shaken to be upright, the top blowing organization oxygen blowing operation is lowered, a first batch of slag making materials are added, simultaneously, the gas bottom blowing of the converter is started, after the top blowing is carried out for 2-3 min, the switching valve is used for switching the bottom blowing gas into the high-pressure fluidized gas carrying the lime, the high-pressure fluidized gas gradually enters a decarburization period, the lime is fully decomposed into CaO and CO2, the CO2 and carbon in the molten steel effectively react to generate CO gas, and a molten pool is further stirred; and after switching, controlling the blowing time to be 4-8min, and switching to a later argon blowing mode. The gas supply pressure of the lime-carrying carrier gas is 0.8-1.8 MPa, the gas supply intensity in the blowing process is 0.04-0.1M 3/t.min, and the lime carrying amount is 3-7 kg/t.min. The carrier gas is Ar, N2, O2Natural gas, CO2And air after dehydration.
3) Controlling the oxygen content and the molten steel temperature at the end point of the converter, controlling the oxygen content of the molten steel at the end point of the converter to be 800-1000 ppm, and controlling the temperature of the molten steel at the end point of the converter to be 1690-1720 ℃;
4) tapping molten steel from the previous converter, and leaving all or part of steel slag of the converter in the converter after slag adjustment and slag splashing; the slag regulation of the steel slag is that 12 kg/ton of steel slag thickening agent is added after the steel is put in the converter, then the rear end of the converter is lifted to splash slag, and all the steel slag remains in the converter after the slag splashing is finished.
5) Heating the next converter before smelting the molten steel, and in order to reach the temperature of the molten iron as soon as possible, adding 6-8kg of heating agent per ton of steel into the converter, and controlling the temperature of the molten iron to be not lower than 1400 ℃; the heating agent is fixed carbon, the adding amount of each time is controlled to be 550-650 kg, and the batch adding time interval is more than 30 seconds.
6) The adding amount of lime, dolomite and stones is controlled, the adding amount of lime is controlled to be 38-45 kg/ton steel, the adding amount of dolomite is controlled to be 17-20 kg/ton steel, and the adding amount of stones is controlled to be 41-46 kg/ton steel.
7) And (4) carrying out converter blowing, controlling the end point oxygen content and the molten steel temperature, and carrying out deslagging, slag retention and tapping.
Slag remaining operation reduces 500kg of lime, 500kg of dolomite and 800kg of stones in each furnace. 520 yuan/ton lime, 370 yuan/ton dolomite and 120 yuan/ton stone. Leaving 15 furnaces per day, theoretical savings (0.5 × 520+0.5 × 370+0.8 × 120) — 15 ═ 8115 elements/day 30 ═ 24.345 ten thousand elements/month 12 ═ 292.14 ten thousand elements/year. Thereby achieving the purposes of reducing the cost, improving the alkalinity of the refining slag and the like.
The present invention is not limited to the above embodiments, and any structural changes made under the teaching of the present invention shall fall within the scope of the present invention, which is similar or similar to the technical solutions of the present invention.
The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (6)
1. A method for producing plain carbon steel based on converter slag retention is characterized by comprising the following steps:
1) and (3) slagging in the previous converter production: the proportion of the added molten iron is 86-89%, and the adding amount of lime, dolomite and stones is controlled;
2) blowing into slag in a converter: the converter adopts a structure combining top blowing and bottom blowing by installing blowing equipment at the bottom, carries lime, dolomite and stone slagging materials, and rapidly forms slag at the initial stage;
3) controlling the oxygen content and the molten steel temperature at the end point of the converter, controlling the oxygen content of the molten steel at the end point of the converter to be 800-1000 ppm, and controlling the temperature of the molten steel at the end point of the converter to be 1690-1720 ℃;
4) tapping molten steel from the previous converter, and leaving all or part of steel slag of the converter in the converter after slag adjustment and slag splashing;
5) heating the next converter before smelting the molten steel, and in order to reach the temperature of the molten iron as soon as possible, adding 6-8kg of heating agent per ton of steel into the converter, and controlling the temperature of the molten iron to be not lower than 1400 ℃;
6) controlling the addition amount of lime, dolomite and stones, wherein the addition amount of lime is controlled to be 38-45 kg/ton steel, the addition amount of dolomite is controlled to be 17-20 kg/ton steel, and the addition amount of stones is controlled to be 41-46 kg/ton steel;
7) and (4) carrying out converter blowing, controlling the end point oxygen content and the molten steel temperature, and carrying out deslagging, slag retention and tapping.
2. A process for producing a plain carbon steel based on converter slag according to claim 1, wherein the molten iron in step 1 has a temperature of not less than 1400 ℃, the sulfur content in the desulfurized molten iron is less than 0.002%, the amount of lime added is 41 to 48 kg/ton of steel, the amount of dolomite added is 20 to 23 kg/ton of steel, and the amount of stone added is 39 to 44 kg/ton of steel.
3. A plain carbon steel production method based on converter slag retention according to claim 1, characterized in that the blowing equipment in step 2 is arranged with a special ventilating blowing element annularly along the center line of the converter as an axis, and a bottom connecting pipeline adopts a wear-resistant conveying pipeline; the conveying pipeline is connected with a gas switching valve, the switching valve is used for switching bottom blowing gas and lime carried by fluidized high-pressure carrier gas, the converter is added with molten iron, the furnace body is straightened by shaking, the top blowing organization oxygen blowing operation is descended, a first batch of slag making materials are added, simultaneously the bottom blowing of the converter gas is started, the converter gas is switched into the high-pressure fluidized gas carrying the lime by the switching valve after the top blowing is carried out for 2-3 min, the high-pressure fluidized gas gradually enters the decarburization period, and the lime is fully decomposed into CaO and CO2，CO2Effectively reacting with carbon in the molten steel to generate CO gas, and further stirring the molten pool; and after switching, controlling the blowing time to be 4-8min, and switching to a later argon blowing mode.
4. A plain carbon steel production method based on converter slag retention according to claim 3, characterized in that the lime carrier-carrying gas supply pressure is 0.8-1.8 MPa, and the blowing process gas supply intensity is 0.04-0.1M3The amount of lime carried is 3-7 kg/t.min.
5. The method for producing a plain carbon steel based on the slag remaining in the converter according to claim 1, wherein the slag adjustment in the step 4 is performed by adding 12 kg/ton of steel slag thickener after the converter is charged with steel, then lifting the rear end of the converter to splash slag, and leaving all the steel slag in the converter after the splashing is completed.
6. A plain carbon steel production method based on converter slag retention according to claim 1, characterized in that the temperature raising agent in step 5 is fixed carbon, the addition amount of each time is controlled to be 550-650 kg, and the batch addition time interval is more than 30 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111393313.4A CN114085943A (en) | 2021-11-23 | 2021-11-23 | Production method of plain carbon steel based on converter slag retention |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111393313.4A CN114085943A (en) | 2021-11-23 | 2021-11-23 | Production method of plain carbon steel based on converter slag retention |
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| Publication Number | Publication Date |
|---|---|
| CN114085943A true CN114085943A (en) | 2022-02-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111393313.4A Pending CN114085943A (en) | 2021-11-23 | 2021-11-23 | Production method of plain carbon steel based on converter slag retention |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005089839A (en) * | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | Method for refining molten steel |
| CN104911295A (en) * | 2015-06-08 | 2015-09-16 | 北京科技大学 | Converter low-slag-added smelting method |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN109852762A (en) * | 2019-04-01 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of compound top and bottom combined blown converter bottom spray lime stone smelting process |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
| CN113652516A (en) * | 2021-06-30 | 2021-11-16 | 首钢京唐钢铁联合有限责任公司 | Thick slag agent, preparation method thereof and slag splashing furnace protection method |
-
2021
- 2021-11-23 CN CN202111393313.4A patent/CN114085943A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005089839A (en) * | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | Method for refining molten steel |
| CN104911295A (en) * | 2015-06-08 | 2015-09-16 | 北京科技大学 | Converter low-slag-added smelting method |
| CN108893574A (en) * | 2018-06-20 | 2018-11-27 | 山东钢铁股份有限公司 | One kind being used for molten iron [Si]<0.50% converter steel making method |
| CN109852762A (en) * | 2019-04-01 | 2019-06-07 | 山东钢铁集团日照有限公司 | A kind of compound top and bottom combined blown converter bottom spray lime stone smelting process |
| CN110373511A (en) * | 2019-07-17 | 2019-10-25 | 邯郸钢铁集团有限责任公司 | A kind of converter smelting process of low lime consumption |
| CN113652516A (en) * | 2021-06-30 | 2021-11-16 | 首钢京唐钢铁联合有限责任公司 | Thick slag agent, preparation method thereof and slag splashing furnace protection method |
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| 尹建妙: "转炉留渣操作工艺实践", 《天津冶金》 * |
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Application publication date: 20220225 |