CN109852760A - A kind of converter preheating scrap improves the smelting process of scrap ratio - Google Patents
A kind of converter preheating scrap improves the smelting process of scrap ratio Download PDFInfo
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- CN109852760A CN109852760A CN201811464910.XA CN201811464910A CN109852760A CN 109852760 A CN109852760 A CN 109852760A CN 201811464910 A CN201811464910 A CN 201811464910A CN 109852760 A CN109852760 A CN 109852760A
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- scrap
- steel
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- preheating
- ratio
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- 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
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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Abstract
The invention discloses the smelting process that a kind of converter preheating scrap improves scrap ratio, this method specifically: 24%~27%, hot metal ratio is controlled 73%~76% for scrap ratio control in burden structure；Steel scrap is first added to steel scrap bucket, later allocates and transports steel scrap bucket to coal across the anthracite of 9~12kg/t of addition, before later allocating and transporting steel scrap hopper to Converter and is added in converter into steel scrap bucket；Lower oxygen gun blowing carries out scrap steel preheating, and blowing oxygen quantity is controlled in 10.0~12.2Nm3/t；Scrap steel preheating terminates to mention rifle, and hot metal charging carries out conventional smelting.The present invention can solve the problems, such as that the high scrap ratio of converter smelts shortage of heat, and scrap ratio can reach 24% or more.
Description
Technical field
The invention belongs to field of steel metallurgy, and in particular to a kind of converter preheating scrap improves the smelting process of scrap ratio.
Background technique
Green resource of the steel scrap as steel and iron industry, the load energy value of environmental protection with higher.With China's steel and iron industry
It rapidly develops, the steel amount in China increases year by year, while social scrap resources also increase accordingly.Country explicitly indicates that comprehensively
Intermediate frequency furnace, the main frequency furnace production capacity for banning production " bar steel " will raise the steel scrap supply of China's steel and iron industry in a short time
Amount.Social steel scrap data is sufficient, and price is more competitive with respect to molten iron, in the case, improves pneumatic steelmaking scrap ratio, no
Steel-making yield only can be improved, moreover it is possible to reduce steel-making cost.
Converter, which improves scrap ratio smelting, need to mainly solve the problems, such as that furnace inner heat source is insufficient, existing raising pneumatic steelmaking steel scrap
There are mainly two types of for the technology of ratio: the first is converter steelmaking process addition heating material (carbon system, silicon systems or aluminium system), can
Increase furnace inner heat source, improves scrap ratio, but the method is easy to increase the impurity elements such as S, N in molten steel, and the thermal effect for the agent that heats up
Rate is relatively low；Second is the outer preheating scrap of furnace, such as ladle baking steel scrap or steel scrap heat in induction furnace, such
Mode need to additionally increase equipment, and increase scheduling difficulty.
It is current in conclusion finding a kind of smelting process for operating convenient, low-cost raising ton steel scrap ratio
Metallargist's urgent problem.
Summary of the invention
To overcome the problems, such as that the high scrap ratio of converter smelts the shortage of heat occurred, it is useless that the present invention provides a kind of converter preheating
Steel improves the method that scrap ratio is smelted, can be low using burning price under conditions of scrap ratio is more than 24% and does not increase equipment
Honest and clean anthracite generates CO2The mode of release heat heats steel scrap, solves high scrap ratio and smelts asking for shortage of heat
Topic.
The present invention specifically uses following technological means:
A kind of converter preheating scrap improves the smelting process of scrap ratio, including charging, scrap steel preheating, hot metal charging smelt and
Tapping:
(1) it charges: steel scrap and anthracite is added in Converter, anthracite additional amount is 9~12kg/t, burden structure
The control of middle scrap ratio 24%~27%,
(2) scrap steel preheating: lower oxygen gun blowing preheating scrap, blowing oxygen quantity are controlled in 10.0~12.2Nm3/ t, scrap steel preheating
Rifle and back and forth grate are mentioned after complete；
(3) hot metal charging is smelted: grate hot metal charging, molten iron additional amount is the 73%~76% of total furnace charge, with adding amount of scrap steel
Match, oxygen rifle is descended to blow again later, terminal basicity of slag is controlled 3.2~3.8；
(4) tap: when the temperature of molten steel reaches 1620~1650 DEG C, in molten steel the mass fraction of phosphorus less than 0.015%,
When the mass fraction of carbon is 0.03%~0.08%, tapping steel is carried out.
Further, the converter preheating scrap improves in the smelting process charging process of scrap ratio, and a upper furnace splashes slag shield
After furnace, first paving adds lime in Converter, and lime adding amount is 3~5kg/t, rear that steel scrap and anthracite is added.
Further, the converter preheating scrap improves in the smelting process charging process of scrap ratio, first adds steel scrap
Enter to steel scrap bucket, then by steel scrap bucket allocate and transport to coal across, into steel scrap bucket be added anthracite after steel scrap hopper is allocated and transported to converter
Stokehold is simultaneously added in Converter.
Further, the converter preheating scrap improves the smelting process scrap steel preheating process of scrap ratio, using permanent rifle position
The oxygen supply system of variable-flow, oxygen blast rifle position control in 1.6~1.8m, blowing oxygen quantity 0~30%, oxygen blast flow control 2.3~
2.5Nm3/min/t；In blowing oxygen quantity 30%~70%, oxygen blast flow control is in 1.8~2.0 Nm3/min/t；Blowing oxygen quantity 70%~
In 100%, oxygen blast flow control is in 1.4~1.6Nm3/min/t。
Compared with prior art, the present invention at least has the following beneficial effects:
1. the present invention generates CO by using the cheap anthracite that burns2The mode for discharging heat carries out steel scrap
Heating can control 24%~27% and under conditions of do not increase equipment in scrap ratio, solve high scrap ratio and smelt shortage of heat
The problem of.
2. the present invention provides heat using anthracitic mode of burning, S, N in anthracite are oxidized discharge substantially, keep away
Exempt to enter molten steel, ensure that the cleanliness of molten steel.
3. the present invention adds lime and using the oxygen supply system of permanent rifle position variable-flow by spreading after upper furnace slag splashing
Degree, because of the damage caused by oxygen blast to furnace lining when reducing scrap steel preheating.
Specific embodiment
Further description of the technical solution of the present invention with reference to embodiments.
Embodiment 1
Technical solution of the present invention is used to be smelted in nominal capacity for the converter of 180t.
After upper furnace slag splashing, 730kg lime is added in converter.50t steel scrap is packed by charger and is given up
Steel hopper is simultaneously allocated and transported to coal across 1.6t anthracite is added in past steel scrap hopper, and the steel scrap hopper of steel scrap and coal dust will be housed later
Converter is added in allocation and transportation to stokehold.
Oxygen rifle is descended to carry out oxygen blast operation later, control of lance position is in 1.7m, 0~630Nm of blowing oxygen quantity3, oxygen flow control
System is in 25000Nm3/h；630~1470Nm of blowing oxygen quantity3, oxygen flow control is in 20000Nm3/h；Blowing oxygen quantity 1470~
2100Nm3, oxygen flow control is in 16000Nm3/h.Scrap steel preheating terminates to mention rifle and back and forth grate 2 times, is added in furnace later
146t molten iron.
After having converted molten iron, oxygen rifle is descended to be smelted again, and a small amount of multiple batches of addition is a certain amount of in smelting process
The slag formers such as lime, light dolomite.Converter terminal basicity of slag is controlled 3.5 ± 0.3.
The mass fraction of carbon is 0.045% in smelting endpoint molten steel, and the mass fraction of phosphorus is 0.013%, the quality point of sulphur
The mass fraction that number is 0.023%, N is 0.0036%, when temperature is 1625 DEG C, carries out tapping steel.
Converter scrap ratio is 25.5%, and total oxygen blow duration is 19.3min, and total blowing oxygen quantity is 9018Nm3, when total smelting
Between be 43min.
Embodiment 2
Technical solution of the present invention is used to be smelted in nominal capacity for the converter of 180t.
After upper furnace slag splashing, 650kg lime is added in converter.48t steel scrap is packed by charger and is given up
Steel hopper is simultaneously allocated and transported to coal across 1.5t anthracite is added in past steel scrap hopper, and the steel scrap hopper of steel scrap and coal dust will be housed later
Converter is added in allocation and transportation to stokehold.Converter terminal basicity of slag is controlled 3.5 ± 0.3.
Oxygen rifle is descended to carry out oxygen blast operation later, control of lance position is in 1.7m, 0~600Nm of blowing oxygen quantity3, oxygen flow control
System is in 25000Nm3/h；600~1400Nm of blowing oxygen quantity3, oxygen flow control is in 20000Nm3/h；Blowing oxygen quantity 1400~
2000Nm3, oxygen flow control is in 16000Nm3/h.Scrap steel preheating terminates to mention rifle and back and forth grate 2 times, is added in furnace later
148t molten iron.
After having converted molten iron, oxygen rifle is descended to be smelted again, and a small amount of multiple batches of addition is a certain amount of in smelting process
The slag formers such as lime, light dolomite.
The mass fraction of carbon is 0.035% in smelting endpoint molten steel, and the mass fraction of phosphorus is 0.013%, the quality point of sulphur
The mass fraction that number is 0.02%, N is 0.0027%, when temperature is 1646 DEG C, is tapped.
Converter scrap ratio is 24.5%, and total oxygen blow duration is 19.8min, and total blowing oxygen quantity is 9832Nm3, when total smelting
Between be 44min.
Comparative example 1
Technical solution of the present invention is used to be smelted in nominal capacity for the converter of 180t.
After upper furnace slag splashing, 33t steel scrap is added into converter for grate, and 163t molten iron is added later.
Lower oxygen rifle blows after converting material, and the slag making such as a certain amount of lime, light dolomite are added in smelting process
Agent, converter terminal basicity of slag are controlled 3.5 ± 0.3.
The mass fraction of carbon is 0.06% in smelting endpoint molten steel, and the mass fraction of phosphorus is 0.014%, the quality point of sulphur
The mass fraction that number is 0.025%, N is 0.0033%, when temperature is 1622 DEG C, is tapped.
Converter scrap ratio is 16.8%, and total oxygen blow duration is 13.2min, and total blowing oxygen quantity is 8340Nm3, when total smelting
Between be 35min.
Comparative example 2
Technical solution of the present invention is used to be smelted in nominal capacity for the converter of 180t.
After upper furnace slag splashing, 32t steel scrap is added into converter for grate, and 164t molten iron is added later.
Lower oxygen rifle blows after converting material, and the slag making such as a certain amount of lime, light dolomite are added in smelting process
Agent, converter terminal basicity of slag are controlled 3.5 ± 0.3.
The mass fraction of carbon is 0.04% in smelting endpoint molten steel, and the mass fraction of phosphorus is 0.012%, the quality point of sulphur
The mass fraction that number is 0.03%, N is 0.0028%, when temperature is 1635 DEG C, is tapped.
Converter scrap ratio is 16.3%, and total oxygen blow duration is 13.6min, and total blowing oxygen quantity is 8460Nm3, when total smelting
Between be 35.6min.
Compared by above-described embodiment and comparative example as it can be seen that the present invention is had at low cost using burning anthracite preheating scrap
The advantages of honest and clean, easy to operate, without increasing equipment, improves pneumatic steelmaking scrap ratio, increases steel-making yield, reducing has
Double promotions of Business Economic Benefit, social benefit are finally realized in the generation of evil gas and solid waste.
Finally, it is stated that the above examples are only used to illustrate the technical scheme of the present invention and are not limiting, although referring to compared with
Good embodiment describes the invention in detail, those skilled in the art should understand that, it can be to skill of the invention
Art scheme is modified or replaced equivalently, and without departing from the objective and range of the technical program, should all be covered in the present invention
Scope of the claims in.
Claims (4)
1. a kind of converter preheating scrap improves the smelting process of scrap ratio, including charging, scrap steel preheating, hot metal charging are smelted and are gone out
Steel, it is characterised in that:
(1) it charges: steel scrap and anthracite is added in Converter, anthracite additional amount is 9~12kg/t, steel scrap in burden structure
Than control 24%~27%,
(2) scrap steel preheating: lower oxygen gun blowing preheating scrap, blowing oxygen quantity are controlled in 10.0~12.2Nm3/ t, after scrap steel preheating is complete
Mention rifle and back and forth grate；
(3) hot metal charging is smelted: grate hot metal charging, molten iron additional amount is the 73%~76% of total furnace charge, with adding amount of scrap steel phase
Match, oxygen rifle is descended to blow again later, terminal basicity of slag is controlled 3.2~3.8；
(4) tap: when the temperature of molten steel reaches 1620~1650 DEG C, the mass fraction of phosphorus is less than 0.015% in molten steel, the matter of carbon
When amount score is 0.03%~0.08%, tapping steel is carried out.
2. the smelting process that converter preheating scrap according to claim 1 improves scrap ratio, it is characterised in that: the charging
In the process, after upper furnace slag splashing, first paving adds lime in Converter, and lime adding amount is 3~5kg/t, rear to be added
Steel scrap and anthracite.
3. the smelting process that converter preheating scrap according to claim 1 or 2 improves scrap ratio, it is characterised in that: described
In charging process, steel scrap is first added to steel scrap bucket, then steel scrap bucket is allocated and transported to coal across after anthracite is added into steel scrap bucket
Before steel scrap hopper is allocated and transported to Converter and it is added in Converter.
4. the smelting process that converter preheating scrap according to claim 1 improves scrap ratio, it is characterised in that: described is useless
Steel warm, using the oxygen supply system of permanent rifle position variable-flow, oxygen blast rifle position is controlled in 1.6~1.8m, blowing oxygen quantity 0~30%
Interior, oxygen blast flow control is in 2.3~2.5Nm3/min/t；In blowing oxygen quantity 30%~70%, oxygen blast flow control 1.8~
2.0Nm3/min/t；In blowing oxygen quantity 70%~100%, oxygen blast flow control is in 1.4~1.6Nm3/min/t。
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811464910.XA CN109852760A (en) | 2018-12-03 | 2018-12-03 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811464910.XA CN109852760A (en) | 2018-12-03 | 2018-12-03 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
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| CN109852760A true CN109852760A (en) | 2019-06-07 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904299A (en) * | 2019-10-28 | 2020-03-24 | 张家港宏昌钢板有限公司 | Method for supplementing heat by using carbon-based heating agent for converter |
| CN111154938A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Smelting method for applying light and thin scrap steel in converter |
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
| CN112029948A (en) * | 2020-07-13 | 2020-12-04 | 首钢集团有限公司 | Scrap steel preheating method and control system |
| CN112126734A (en) * | 2020-09-15 | 2020-12-25 | 山东钢铁集团日照有限公司 | Converter thermal compensation smelting method |
| CN112280926A (en) * | 2020-10-30 | 2021-01-29 | 张家港荣盛特钢有限公司 | Smelting method for producing low-P steel by converter |
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
| CN114058768A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Converter smelting method for improving converter scrap ratio |
| CN114231693A (en) * | 2021-12-20 | 2022-03-25 | 欧冶链金再生资源有限公司 | Scrap steel packaging block and manufacturing method thereof and steel making method |
| CN114381568A (en) * | 2021-12-02 | 2022-04-22 | 安阳钢铁股份有限公司 | Method for improving converter tapping quantity |
| CN114774614A (en) * | 2022-04-14 | 2022-07-22 | 首钢集团有限公司 | Converter steelmaking method |
| CN115261547A (en) * | 2021-04-30 | 2022-11-01 | 宝山钢铁股份有限公司 | Method, device, system and storage medium for determining optimal scrap preheating temperature |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039446A (en) * | 1988-07-11 | 1990-02-07 | 霍格温斯·格鲁普公司 | In the Oxygen Furnace Steel converter, produce the method for steel in batches with steel scrap |
| US5868817A (en) * | 1994-06-30 | 1999-02-09 | Nippon Steel Corporation | Process for producing steel by converter |
| CN107419051A (en) * | 2017-08-23 | 2017-12-01 | 华北理工大学 | Promote the smelting process of converter scrap melting using the dephosphorized slag that gasifies |
| CN107663561A (en) * | 2017-09-25 | 2018-02-06 | 云南曲靖呈钢钢铁（集团）有限公司 | A kind of smelting process of steel scrap stove external heat reuse |
-
2018
- 2018-12-03 CN CN201811464910.XA patent/CN109852760A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1039446A (en) * | 1988-07-11 | 1990-02-07 | 霍格温斯·格鲁普公司 | In the Oxygen Furnace Steel converter, produce the method for steel in batches with steel scrap |
| US5868817A (en) * | 1994-06-30 | 1999-02-09 | Nippon Steel Corporation | Process for producing steel by converter |
| CN107419051A (en) * | 2017-08-23 | 2017-12-01 | 华北理工大学 | Promote the smelting process of converter scrap melting using the dephosphorized slag that gasifies |
| CN107663561A (en) * | 2017-09-25 | 2018-02-06 | 云南曲靖呈钢钢铁（集团）有限公司 | A kind of smelting process of steel scrap stove external heat reuse |
Non-Patent Citations (1)
| Title |
|---|
| 李碧春: "《提高转炉废钢比的技术措施》", 《重庆钢铁高等专科学校学报》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110904299A (en) * | 2019-10-28 | 2020-03-24 | 张家港宏昌钢板有限公司 | Method for supplementing heat by using carbon-based heating agent for converter |
| CN111154938A (en) * | 2020-01-21 | 2020-05-15 | 鞍钢股份有限公司 | Smelting method for applying light and thin scrap steel in converter |
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
| CN112029948A (en) * | 2020-07-13 | 2020-12-04 | 首钢集团有限公司 | Scrap steel preheating method and control system |
| CN112126734A (en) * | 2020-09-15 | 2020-12-25 | 山东钢铁集团日照有限公司 | Converter thermal compensation smelting method |
| CN112280926A (en) * | 2020-10-30 | 2021-01-29 | 张家港荣盛特钢有限公司 | Smelting method for producing low-P steel by converter |
| CN115261547A (en) * | 2021-04-30 | 2022-11-01 | 宝山钢铁股份有限公司 | Method, device, system and storage medium for determining optimal scrap preheating temperature |
| CN115261547B (en) * | 2021-04-30 | 2024-05-14 | 宝山钢铁股份有限公司 | Method, device, system and storage medium for determining optimal scrap preheating temperature |
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
| CN114058768A (en) * | 2021-10-18 | 2022-02-18 | 首钢集团有限公司 | Converter smelting method for improving converter scrap ratio |
| CN114381568A (en) * | 2021-12-02 | 2022-04-22 | 安阳钢铁股份有限公司 | Method for improving converter tapping quantity |
| CN114231693A (en) * | 2021-12-20 | 2022-03-25 | 欧冶链金再生资源有限公司 | Scrap steel packaging block and manufacturing method thereof and steel making method |
| CN114774614A (en) * | 2022-04-14 | 2022-07-22 | 首钢集团有限公司 | Converter steelmaking method |
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Application publication date: 20190607 |