CN115558737B - Secondary combustion oxygen lance converting process capable of effectively reducing TFe content of final slag of converter - Google Patents
Secondary combustion oxygen lance converting process capable of effectively reducing TFe content of final slag of converter Download PDFInfo
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- CN115558737B CN115558737B CN202211225943.5A CN202211225943A CN115558737B CN 115558737 B CN115558737 B CN 115558737B CN 202211225943 A CN202211225943 A CN 202211225943A CN 115558737 B CN115558737 B CN 115558737B
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- tapping
- slag
- furnace
- converting
- oxygen lance
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 54
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 54
- 239000001301 oxygen Substances 0.000 title claims abstract description 54
- 239000002893 slag Substances 0.000 title claims abstract description 37
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 17
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000010079 rubber tapping Methods 0.000 claims abstract description 24
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 229910052742 iron Inorganic materials 0.000 claims abstract description 14
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 12
- 238000007664 blowing Methods 0.000 claims abstract description 11
- 238000003723 Smelting Methods 0.000 claims abstract description 10
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 8
- 239000010459 dolomite Substances 0.000 claims abstract description 8
- 238000012423 maintenance Methods 0.000 claims abstract description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 6
- 238000005275 alloying Methods 0.000 claims abstract description 6
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 6
- 238000003825 pressing Methods 0.000 claims description 5
- 230000001502 supplementing effect Effects 0.000 abstract description 4
- 230000003628 erosive effect Effects 0.000 abstract description 2
- 239000000463 material Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/32—Blowing from above
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a secondary combustion oxygen lance converting process for effectively reducing the TFe content of converter final slag, which comprises the following steps: after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on furnace conditions; adding scrap steel and molten iron, and shaking up the furnace body; igniting and rapidly lowering the gun to the position of a converting gun for blowing, simultaneously adding a first batch of slag, after converting, adding a second batch of slag, and simultaneously supplementing raw dolomite, thereby ensuring the tapping temperature of a smelting end point; when the oxygen supply reaches 70% -80%, TSC temperature measurement sampling is carried out, and the oxygen lance is lowered to a carbon pulling lance position in two stages before TSC temperature measurement sampling; pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping; tapping and simultaneously deoxidizing and alloying. The invention can control the final slag TFe at the same level as that of a common oxygen lance, and even lower, thereby not only effectively improving the utilization rate of steel and iron materials, but also reducing the risk of erosion of a furnace lining and reducing the maintenance cost of the converter.
Description
Technical Field
The invention belongs to the field of metallurgical engineering, and particularly relates to a secondary combustion oxygen lance converting process for effectively reducing the TFe content of converter final slag.
Background
In recent years, due to the adoption of the process of molten iron pretreatment, the problems of molten iron temperature reduction, loss of exothermic elements in molten iron and the like are caused, so that the converter only takes on the tasks of dephosphorization, decarburization and temperature rise, but the surplus heat of the converter is reduced due to the reduction of heat sources brought into the converter. The LBE technology is developed to make converter blowing more balanced and metallurgical reaction tend to be balanced, but the oxidation of Fe, mn and other elements in molten steel is reduced, and the waste steel ratio of the converter is slightly reduced. In order to improve economic benefits, iron and steel enterprises have to make efforts to reduce the molten iron ratio and improve the scrap ratio. All the methods can accelerate the development, popularization and application of converter thermal compensation technology by steel-making workers at home and abroad. The secondary combustion in the converter is to burn CO in the converter into CO by means of a specific oxygen supply device, namely a secondary combustion oxygen gun 2 Thermal compensation to increase the temperature of molten steelTechniques.
On the basis of researching and developing the secondary combustion oxygen lance technology, the secondary combustion oxygen lance has the effect of improving the thermal compensation and good slag melting effect, is not difficult to reform the existing oxygen lance, and has little investment and higher economic benefit.
Meanwhile, with the advent of the secondary combustion oxygen lance technology, the traditional converting process thought is no longer applicable, and a plurality of technical blanks exist in the converting process, so that metallurgical workers are required to continuously explore and perfect the technology. In the technical popularization process, the auxiliary holes have a certain soft blowing effect on steel slag due to good slag melting effect, and if the blowing process is improper, the condition that the content of the final slag TFe is high and is not low is easily caused, which is a difficult problem always puzzling metallurgical workers in the secondary combustion oxygen lance popularization process.
Disclosure of Invention
The invention aims to: the invention aims to disclose a secondary combustion oxygen lance converting process for effectively reducing the TFe content of converter final slag.
The technical scheme is as follows: the invention discloses a secondary combustion oxygen lance converting process for effectively reducing the TFe content of converter final slag, which comprises the following steps:
s1, after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on furnace conditions;
s2, adding scrap steel and molten iron, and shaking up the furnace body;
s3, igniting the quick gun to open and blow the position of the converting gun, adding a first batch of slag charge, converting, adding a second batch of slag charge, and adding raw dolomite at the same time, so as to ensure the tapping temperature at the smelting end point;
s4, when the oxygen supply reaches 70% -80%, TSC temperature measurement sampling is carried out, at the moment, the oxygen supply flow of the oxygen lance can be reduced by about 50%, and the oxygen lance is lowered to a carbon pulling lance position in two stages before TSC temperature measurement sampling;
s5, pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping;
s6, tapping and deoxidizing and alloying at the same time.
Further, the gun descending time in S3 is controlled within 30 seconds, the gun descending time of the existing common gun is 2-3 minutes, the secondary combustion oxygen gun is shortened to be within 30 seconds, and because the secondary combustion oxygen gun is designed to have larger oxygen supply flow, the jet flow width is wider than that of the common oxygen gun, the gun is quickly descended, the activity of slag can be effectively reduced, and splashing is prevented; after converting for 1min, adding a second batch of slag; 500-1000kg of raw dolomite is added.
Further, in S4, the gun pressing time is ensured to be 2min, when the TSC measures the temperature and samples, the lower oxygen supply flow is easy to form a soft blowing effect on converter slag, so that the oxidizing property of the slag is increased, the TFe content of the final slag at the smelting end point is increased, the TSC measures the temperature and samples in the past, and the operation is not suitable for a secondary combustion oxygen gun.
The beneficial effects are that: compared with the prior art: the invention can control the final slag TFe at the same level as that of a common oxygen lance, and even lower, thereby not only effectively improving the utilization rate of steel and iron materials, but also reducing the risk of erosion of a furnace lining and reducing the maintenance cost of the converter.
Detailed Description
The invention is further described below with reference to examples.
Example 1
In a test of HRB400Nb-2 threaded steel of a 120 ton converter in a certain steel plant, an oxygen lance is a single-pass secondary combustion oxygen lance, and the converting process is controlled as follows:
the first step: after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on the furnace condition through operations such as furnace shaking, slag splashing, furnace protection and the like;
and a second step of: adding scrap steel and molten iron, and shaking up the furnace body;
and a third step of: after ignition, the oxygen lance is lowered to a converting lance position of 1.5m at 28s, and a first batch of slag is added at the same time, and a second batch of slag is added after converting for 1min, wherein 500kg of raw dolomite is added according to the heat supplementing characteristic of the secondary combustion oxygen lance, so that the tapping temperature of a smelting end point is ensured;
fourth step: when the oxygen supply reaches 70%, TSC temperature measurement sampling is carried out, at the moment, the oxygen supply flow of the oxygen lance is reduced by about 50%, the oxygen lance is lowered to a carbon pulling lance position of 1.3m in two stages before TSC temperature measurement sampling, and the lance pressing time is 2min;
fifth step: pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping;
sixth step: tapping and simultaneously deoxidizing and alloying.
Through test, the content of TFe in the final slag is 13.87 percent which is lower than 15 percent of that in common smelting.
Example 2
In the test of SM490A-1 steel of 150 ton converter in a certain steel mill, the oxygen lance is a single-pass secondary combustion oxygen lance, and the converting process is controlled as follows:
the first step: after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on the furnace condition through operations such as furnace shaking, slag splashing, furnace protection and the like;
and a second step of: adding scrap steel and molten iron, and shaking up the furnace body;
and a third step of: after ignition, the oxygen lance is lowered to a converting lance position of 1.6m at 30s, a first batch of slag is added at the same time, after converting for 1min, a second batch of slag is added, and at the moment, 700kg of raw dolomite is added according to the heat supplementing characteristic of the secondary combustion oxygen lance so as to ensure the tapping temperature of a smelting end point;
fourth step: when the oxygen supply reaches 75%, TSC temperature measurement sampling is carried out, at the moment, the oxygen supply flow of the oxygen lance is reduced by about 50%, the oxygen lance is lowered to a carbon pulling lance position of 1.4m in two stages before TSC temperature measurement sampling, and the lance pressing time is 2min;
fifth step: pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping;
sixth step: tapping and simultaneously deoxidizing and alloying.
Through test, the content of TFe in the final slag is 16.06 percent, which is slightly lower than 16.63 percent of that in general smelting.
Example 3
In a test of HRB400Nb-2 threaded steel of a 100 ton converter in a certain steel mill, an oxygen lance is a single-pass secondary combustion oxygen lance, and the converting process is controlled as follows:
the first step: after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on the furnace condition through operations such as furnace shaking, slag splashing, furnace protection and the like;
and a second step of: adding scrap steel and molten iron, and shaking up the furnace body;
and a third step of: after ignition, the oxygen lance is lowered to a converting lance position of 1.5m in 26s, and meanwhile, a first batch of slag is added, and after converting for 1min, a second batch of slag is added, at the moment, 1000kg of raw dolomite is added according to the heat supplementing characteristic of the secondary combustion oxygen lance, so that the tapping temperature of a smelting end point is ensured;
fourth step: when the oxygen supply reaches 80%, TSC temperature measurement sampling is carried out, at the moment, the oxygen supply flow of the oxygen lance is reduced by about 50%, the oxygen lance is lowered to a carbon pulling lance position of 1.3m in two stages before TSC temperature measurement sampling, and the lance pressing time is 2min;
fifth step: pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping;
sixth step: tapping and simultaneously deoxidizing and alloying.
Through test and detection, the content of TFe in the final slag is 12.98 percent which is lower than 15 percent of that in common smelting.
Claims (1)
1. The secondary combustion oxygen lance converting process for effectively reducing the TFe content of the final slag of the converter is characterized by comprising the following steps of:
s1, after tapping and deslagging are finished, checking a furnace lining, and carrying out necessary maintenance on furnace conditions;
s2, adding scrap steel and molten iron, and shaking up the furnace body;
s3, igniting the quick gun to open and blow the position of the converting gun, adding a first batch of slag charge, converting, adding a second batch of slag charge, and adding raw dolomite at the same time, so as to ensure the tapping temperature at the smelting end point;
s4, when the oxygen supply reaches 70% -80%, TSC temperature measurement sampling is carried out, and the oxygen lance is lowered to a carbon pulling lance position in two stages before TSC temperature measurement sampling;
s5, pouring the furnace, measuring the temperature, sampling, and determining the blowing time or tapping;
s6, tapping and deoxidizing and alloying at the same time;
wherein the gun falling time in S3 is controlled within 30S; after converting for 1min, adding a second batch of slag; adding 500-1000kg of raw dolomite;
and S4, ensuring that the gun pressing time is 2min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211225943.5A CN115558737B (en) | 2022-10-09 | 2022-10-09 | Secondary combustion oxygen lance converting process capable of effectively reducing TFe content of final slag of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211225943.5A CN115558737B (en) | 2022-10-09 | 2022-10-09 | Secondary combustion oxygen lance converting process capable of effectively reducing TFe content of final slag of converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115558737A CN115558737A (en) | 2023-01-03 |
| CN115558737B true CN115558737B (en) | 2024-03-19 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048562A (en) * | 1989-05-10 | 1991-01-16 | 上海第三钢铁厂 | Double flow compound top blown steel making process and oxygen rifle thereof |
| JPH0543926A (en) * | 1991-08-15 | 1993-02-23 | Kobe Steel Ltd | Secondary combustion blow-refining method |
| CN102094103A (en) * | 2011-01-12 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Method for increasing endpoint carbon content of converter |
| CN105648136A (en) * | 2014-12-04 | 2016-06-08 | 重庆聆益机械有限公司 | Converter blowing and smelting technology |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
-
2022
- 2022-10-09 CN CN202211225943.5A patent/CN115558737B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1048562A (en) * | 1989-05-10 | 1991-01-16 | 上海第三钢铁厂 | Double flow compound top blown steel making process and oxygen rifle thereof |
| JPH0543926A (en) * | 1991-08-15 | 1993-02-23 | Kobe Steel Ltd | Secondary combustion blow-refining method |
| CN102094103A (en) * | 2011-01-12 | 2011-06-15 | 攀钢集团钢铁钒钛股份有限公司 | Method for increasing endpoint carbon content of converter |
| CN105648136A (en) * | 2014-12-04 | 2016-06-08 | 重庆聆益机械有限公司 | Converter blowing and smelting technology |
| CN112646944A (en) * | 2020-12-02 | 2021-04-13 | 扬州圣莱特冶金科技有限公司 | Converter less-slag smelting method |
Non-Patent Citations (2)
| Title |
|---|
| 转炉终渣TFe含量影响因素研究;李宁;燕建宏;江路平;刘文强;孟义春;;山西冶金(01);第24-26页 * |
| 降低转炉终渣TFe技术研究;祝志胜;杜振杰;杨锁兵;;浙江冶金(03);第38-40页 * |
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| CN115558737A (en) | 2023-01-03 |
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