CN115558737A - Secondary combustion oxygen lance blowing process capable of effectively reducing TFe content of converter final slag - Google Patents
Secondary combustion oxygen lance blowing process capable of effectively reducing TFe content of converter final slag Download PDFInfo
- Publication number
- CN115558737A CN115558737A CN202211225943.5A CN202211225943A CN115558737A CN 115558737 A CN115558737 A CN 115558737A CN 202211225943 A CN202211225943 A CN 202211225943A CN 115558737 A CN115558737 A CN 115558737A
- Authority
- CN
- China
- Prior art keywords
- slag
- lance
- furnace
- tapping
- oxygen lance
- Prior art date
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 51
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 51
- 239000001301 oxygen Substances 0.000 title claims abstract description 51
- 239000002893 slag Substances 0.000 title claims abstract description 40
- 238000007664 blowing Methods 0.000 title claims abstract description 21
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 23
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 22
- 238000010079 rubber tapping Methods 0.000 claims abstract description 22
- 239000010959 steel Substances 0.000 claims abstract description 22
- 238000005070 sampling Methods 0.000 claims abstract description 19
- 238000009529 body temperature measurement Methods 0.000 claims abstract description 13
- 229910052742 iron Inorganic materials 0.000 claims abstract description 12
- 238000003723 Smelting Methods 0.000 claims abstract description 11
- 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
- 239000000463 material Substances 0.000 abstract description 4
- 230000001502 supplementing effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000003556 assay Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000012360 testing method Methods 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 blowing process for effectively reducing the TFe content of converter final slag, which comprises the following steps: after the tapping and the slag pouring are finished, the furnace lining is checked, and necessary maintenance is carried out on the furnace condition; adding scrap steel and molten iron, and shaking up the furnace body; igniting and quickly lowering the lance to a converting lance position for blowing, simultaneously adding a first batch of slag, after converting, adding a second batch of slag, and simultaneously adding raw dolomite to ensure the tapping temperature at the smelting terminal point; when the oxygen supply amount reaches 70-80%, carrying out TSC temperature measurement sampling, and lowering the oxygen lance to a carbon drawing lance position in two stages before TSC temperature measurement sampling; turning over the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping; tapping and simultaneously carrying out deoxidation alloying. The invention can control the TFe of the final slag to be at the same level as that of the common oxygen lance, even lower, thereby not only effectively improving the utilization rate of the steel material, but also reducing the risk of corroding the 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 blowing process for effectively reducing TFe content of converter final slag.
Background
In recent years, the adoption of a process for pretreating molten iron causes the temperature of molten iron to be reduced and molten iron to be in molten ironThe converter only takes the tasks of dephosphorization, decarburization and temperature rise due to the problems of heat release element loss and the like, but the heat source brought into the converter is reduced, so the surplus heat of the converter is reduced. The advent of LBE technology has brought converter blowing into more equilibrium and metallurgical reactions into equilibrium, but the oxidation of elements such as Fe and Mn in the molten steel is reduced, and the converter scrap ratio is also slightly reduced. In order to improve the economic benefit, iron and steel enterprises have to work on the research of reducing the molten iron ratio and improving the scrap steel ratio. All of them will accelerate the development and popularization of converter heat compensation technology for steel-smelting workers at home and abroad. The secondary combustion in the converter is to combust CO in the converter into CO by means of a specific oxygen supply device-secondary combustion oxygen lance 2 So as to improve the temperature of the molten steel.
On the basis of research and development of the secondary combustion oxygen lance technology, the secondary combustion oxygen lance is found to have the effects of improving the thermal compensation and good slagging effect, and the existing oxygen lance is not difficult to transform, so that the investment is little, and the economic benefit is high.
Meanwhile, with the advent of the secondary combustion oxygen lance technology, the traditional converting process thinking is no longer applicable, a plurality of technical blanks exist in the converting process, and metallurgy workers are required to continuously explore and perfect. In the technical popularization process, the TFe content of the final slag is used as an important index for reflecting the utilization rate of the steel material of the converter, the quality of the final slag is influenced, and the TFe content of the final slag plays an important role in the campaign length of the converter and the consumption level of the steel material.
Disclosure of Invention
The invention aims to: the invention aims to disclose a secondary combustion oxygen lance blowing 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 blowing process for effectively reducing TFe content of converter final slag, which comprises the following steps:
s1, after the steel is tapped from the furnace and the slag is poured, the furnace lining is checked, and necessary maintenance is carried out on the furnace condition;
s2, adding scrap steel and molten iron, and shaking up a furnace body;
s3, igniting and quickly lowering the lance to a converting lance position for blowing, simultaneously adding a first batch of slag charge, after converting, adding a second batch of slag charge, and simultaneously adding raw dolomite to ensure the tapping temperature at the smelting end point;
s4, when the oxygen supply amount reaches 70-80%, carrying out TSC temperature measurement sampling, wherein the oxygen supply flow of the oxygen lance is reduced by about 50%, and the oxygen lance is lowered to a carbon drawing lance position in two stages before TSC temperature measurement sampling;
s5, reversing the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping;
and S6, tapping, and simultaneously carrying out deoxidation alloying.
Furthermore, the lance dropping time in S3 is controlled within 30S, the conventional common lance dropping time is 2-3 min, and the secondary combustion oxygen lance is shortened to be within 30S; adding a second batch of slag after blowing for 1 min; 500-1000kg raw dolomite is added.
Furthermore, in S4, the gun pressing time is guaranteed to be 2min, when TSC temperature measurement sampling is carried out, the lower oxygen supply flow rate is easy to form a soft blowing effect on converter slag, so that the oxidability of the slag is increased, and the TFe content of final slag at the smelting end point is increased.
Has the beneficial effects that: compared with the prior art: the invention can control the TFe of the final slag to be at the same level as that of the common oxygen lance, even lower, thereby not only effectively improving the utilization rate of the steel material, but also reducing the risk of corroding the furnace lining and reducing the maintenance cost of the converter.
Detailed Description
The present invention will be further described with reference to the following examples.
Example 1
The HRB400Nb-2 deformed steel bar of a 120-ton converter in a certain steel mill is tested, the oxygen lance is a single-flow pass secondary combustion oxygen lance, and the blowing process is controlled as follows:
the first step is as follows: after the tapping and the deslagging are finished, the furnace lining is checked, and necessary maintenance is carried out on the furnace condition through operations such as furnace swinging, slag splashing and furnace protection;
the second step: adding scrap steel and molten iron, and shaking the furnace body;
the third step: after ignition, lowering the oxygen lance to a blowing lance position of 1.5m within 28s, simultaneously adding a first batch of slag, after blowing for 1min, adding a second batch of slag, and supplementing 500kg of raw dolomite according to the heat supplementing characteristic of a secondary combustion oxygen lance so as to ensure the tapping temperature at the smelting end point;
the fourth step: carrying out TSC temperature measurement sampling when the oxygen supply amount reaches 70%, reducing the oxygen supply flow of the oxygen lance by about 50%, reducing the oxygen lance to a carbon drawing lance position of 1.3m in two stages before TSC temperature measurement sampling, and pressing the lance for 2min;
the fifth step: turning over the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping;
and a sixth step: tapping and simultaneously carrying out deoxidation alloying.
The TFe content of the final slag is 13.87 percent and is lower than 15 percent of the TFe content of the common smelting through the detection of an assay.
Example 2
The test is carried out on the SM490A-1 steel of 150 tons of converters in a certain steel mill, the oxygen lance is a single flow pass secondary combustion oxygen lance, and the blowing process is controlled as follows:
the first step is as follows: after the tapping and the deslagging are finished, the furnace lining is checked, and necessary maintenance is carried out on the furnace condition through operations such as furnace swinging, slag splashing and furnace protection;
the second step: adding scrap steel and molten iron, and shaking up the furnace body;
the third step: after ignition, lowering the oxygen lance to the position of a converting lance by 1.6m in 30s, simultaneously adding a first batch of slag, adding a second batch of slag after converting for 1min, and supplementing 700kg of raw dolomite according to the heat supplementing characteristic of a secondary combustion oxygen lance so as to ensure the tapping temperature at the smelting end point for the second time;
the fourth step: carrying out TSC temperature measurement sampling when the oxygen supply amount reaches 75%, reducing the oxygen supply flow of the oxygen lance by about 50%, reducing the oxygen lance to a carbon drawing lance position of 1.4m in two stages before TSC temperature measurement sampling, and pressing the lance for 2min;
the fifth step: turning down the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping;
and a sixth step: tapping and simultaneously carrying out deoxidation alloying.
The TFe content of the final slag is 16.06 percent and is slightly lower than 16.63 percent of the common smelting through the detection of an assay.
Example 3
The HRB400Nb-2 deformed steel bar of a 100-ton converter in a certain steel mill is tested, the oxygen lance is a single-flow pass secondary combustion oxygen lance, and the blowing process is controlled as follows:
the first step is as follows: after tapping and deslagging, checking a furnace lining, and performing necessary maintenance on the furnace condition through operations such as furnace shaking, slag splashing and furnace protection;
the second step is that: adding scrap steel and molten iron, and shaking the furnace body;
the third step: after ignition, lowering the oxygen lance to the position of a converting lance by 1.5m in 26s, simultaneously adding a first batch of slag, adding a second batch of slag after converting for 1min, and supplementing 1000kg of raw dolomite according to the heat supplementing characteristic of a secondary combustion oxygen lance so as to ensure the tapping temperature at the smelting end point for the second time;
the fourth step: when the oxygen supply amount reaches 80%, carrying out TSC temperature measurement sampling, reducing the oxygen supply flow of the oxygen lance by about 50%, reducing the oxygen lance to a carbon drawing lance position of 1.3m in two stages before TSC temperature measurement sampling, and pressing the lance for 2min;
the fifth step: turning down the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping;
and a sixth step: tapping and simultaneously carrying out deoxidation alloying.
The TFe content of the final slag is 12.98 percent and is lower than 15 percent of the TFe content of the common smelting through the detection of an assay.
Claims (3)
1. A secondary combustion oxygen lance blowing process for effectively reducing the TFe content of converter final slag is characterized by comprising the following steps:
s1, after the steel is tapped from the furnace and the slag is poured, the furnace lining is checked, and necessary maintenance is carried out on the furnace condition;
s2, adding scrap steel and molten iron, and shaking up a furnace body;
s3, igniting and quickly lowering the lance to a converting lance position for blowing, simultaneously adding a first batch of slag charge, after converting, adding a second batch of slag charge, and simultaneously adding raw dolomite to ensure the tapping temperature at the smelting terminal point;
s4, when the oxygen supply amount reaches 70-80%, TSC temperature measurement sampling is carried out, and the oxygen lance is lowered to a carbon drawing lance position in two stages before TSC temperature measurement sampling;
s5, reversing the furnace, measuring the temperature, sampling, and determining the blowing-in time or tapping;
and S6, tapping and simultaneously carrying out deoxidation alloying.
2. The post-combustion oxygen lance blowing process effective in reducing the TFe content of the converter final slag according to claim 1, characterized in that: in S3, the gun descending time is controlled within 30S; adding a second batch of slag after blowing for 1 min; 500-1000kg raw dolomite is added.
3. The post-combustion oxygen lance blowing process effective in reducing the TFe content of the converter final slag according to claim 1, characterized in that: 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 true CN115558737A (en) | 2023-01-03 |
| CN115558737B CN115558737B (en) | 2024-03-19 |
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| CN202211225943.5A Active 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 |
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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 |
|---|
| 李宁;燕建宏;江路平;刘文强;孟义春;: "转炉终渣TFe含量影响因素研究", 山西冶金, no. 01, pages 24 - 26 * |
| 祝志胜;杜振杰;杨锁兵;: "降低转炉终渣TFe技术研究", 浙江冶金, no. 03, pages 38 - 40 * |
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| CN115558737B (en) | 2024-03-19 |
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