CN115354110A - Terminal gun pressing method for improving recovery rate of converter alloy - Google Patents
Terminal gun pressing method for improving recovery rate of converter alloy Download PDFInfo
- Publication number
- CN115354110A CN115354110A CN202210944485.4A CN202210944485A CN115354110A CN 115354110 A CN115354110 A CN 115354110A CN 202210944485 A CN202210944485 A CN 202210944485A CN 115354110 A CN115354110 A CN 115354110A
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- CN
- China
- Prior art keywords
- converter
- end point
- smelting
- lance
- molten steel
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Classifications
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- 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
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B47/00—Obtaining manganese
-
- 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
Abstract
The invention relates to a terminal lance pressing method for improving the recovery rate of converter alloy, which relates to the converter smelting technology and improves the composition and temperature of molten steel hitting the terminal at one time by accurately judging the time of pressing the lance at the terminal; automatically timing the gun pressing time to ensure that the components and the temperature of the molten steel at the end point are uniform and representative; and analyzing component fluctuation caused by unstable factors in smelting operation, and providing reference for adjusting smelting parameters. The method obviously improves the recovery rate of manganese in the molten steel at the end point, reduces the cost waste and improves the steel performance; the time and the time for pressing the gun at the end point are automatically controlled, the one-time hit rate of the molten steel at the end point is improved, the number of secondary blowing furnaces is reduced, and the smelting loss is reduced; the obtained end-point furnace slag is sticky, thereby being beneficial to maintaining the converter lining, improving the quality of slag splashing and furnace protection, and effectively prolonging the service life of the converter.
Description
Technical Field
The invention relates to the field of ferrous metallurgy, relates to a converter smelting technology, and particularly relates to a terminal lance pressing method for improving the recovery rate of converter alloy.
Background
The converter steelmaking uses molten iron, scrap steel and ferroalloy as main raw materials, does not need external energy, and completes the steelmaking process in the converter by means of the heat generated by the physical heat of molten iron and the chemical reaction among molten iron components. The converter is mainly used for smelting carbon steel, alloy steel, copper and nickel. The converter smelting of the low alloy steel has no special difficulty. When the alloy steel is smelted, the molten steel temperature can be reduced because the large amount of ferroalloy needs to be added into a steel ladle in alloying, and the dephosphorization is unfavorable because the tapping temperature is excessively increased. Therefore, the alloy steel smelting is combined with the external refining, and the ladle refining furnace (ladle furnace for short) is used for completing the alloying. Further, as the control requirements for the steel composition are becoming stricter, in order to reduce the fluctuation in the steel properties, it is preferable to demand a narrower range of the composition.
In the converter smelting process, the manganese element in the molten iron plays a key role in the performance of steel. In the converter steelmaking process, the Mn content in the molten steel is often increased by the Mn content in the molten steel at the end of the converter and the addition of Si-Mn alloy in the deoxidation alloying process, so that the performance of the steel is improved. Manganese in molten steel at the end of a converter is generally generated by oxidation-reduction reaction of manganese in molten iron, in the past converter smelting, the ratio of the content of Mn element in the molten steel at the end of the converter to the content of Mn element in the molten iron is about 45-48%, more than half of manganese runs off along with slag, and cost waste is caused.
Generally, in the converter steelmaking industry, the residual manganese content at the end point can be effectively improved by controlling the lance pressing time at the steelmaking end point, but the current method still has the following problems: 1. the gun pressing time at the smelting end point is inaccurately controlled, so that the molten steel components and temperature at the early end point of the gun cannot meet the steel discharge requirement, however, the additional blowing increases the smelting time and reduces the manganese content; 2. the time for pressing the gun at the smelting end point is manually timed, and the time for pressing the gun cannot be accurately judged to homogenize the components and the temperature of molten steel; 3. when the smelting end point lance position is lower, the unfavorable phenomena of high phosphorus, high temperature and the like in the end point molten steel can be caused; 4. the high silicon content in the molten iron can cause more slag charge of the converter, and the percentage of the manganese monoxide in the slag is reduced.
Therefore, the technical problem mentioned in the background above is solved by the terminal lance pressing method for improving the recovery rate of the converter alloy.
Disclosure of Invention
The invention aims to provide a terminal lance pressing method for improving the recovery rate of converter alloy, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: according to the end point gun pressing method for improving the recovery rate of the converter alloy, the composition and the temperature of molten steel hitting the end point at one time are improved by accurately judging the time of pressing the end point gun, the number of reblowing furnaces is avoided or reduced, the loss of manganese is reduced, the cost is reduced, and the smelting time is shortened; automatically timing the gun pressing time to ensure that the components and the temperature of the molten steel at the end point are uniform and representative; and analyzing the component fluctuation caused by unstable factors in the smelting operation, and providing reference for adjusting smelting parameters.
The invention relates to a terminal gun pressing method for improving the recovery rate of converter alloy, which comprises the following steps:
s1, controlling and improving the first-dumping carbon content of the converter when the converter is dumped at first time;
s2, ensuring that the content of ferric oxide in the slag is not too low before the smelting end point of the converter, melting the first batch of slag, and ensuring that the end point slag is well melted completely;
s3, observing flame and determining that the concentration of carbon monoxide does not exceed a fixed amount on the premise that the lance is away from the molten steel liquid level at the end of the smelting end point of the converter;
s4, lowering the gun position, observing that the flame overflows to a position above a flue, and continuing lowering the gun to the carbon drawing gun position after the flame is clear;
s5, automatically judging gun pressing time and gun pressing time; raising the oxygen pressure over a period of time;
and S6, carrying out carbon-oxygen reaction before the smelting end point, wherein the temperature of the molten steel is rapidly increased along with the reduction of manganese.
Preferably, the converter has a carbon content of 0.085% or more, and can obtain a more standardized end-point molten steel.
Preferably, the carbon monoxide content in the slag is ensured to be not lower than 25% two minutes before the smelting end point of the converter, the first batch of slag can be well melted, and the complete melting of the end point slag can be ensured.
Preferably, when the lance reaches 1800mm or more of the molten steel surface before the end of the converter smelting, clear flame is observed and the concentration of carbon monoxide is not more than 40%.
Preferably, the lance position is slowly lowered to about 1300mm of the molten steel level.
Preferably, the oxygen pressure is increased to above 1.10MPa within 15S, and the smelting end point is waited.
Preferably, the carbon-oxygen reaction is carried out with the reduction of manganese 50S before the end of the smelting end point, and the temperature of the molten steel is rapidly increased to 1650 ℃ or more.
Compared with the prior art, the invention has the beneficial effects that: the end point gun pressing method for improving the recovery rate of the converter alloy obviously improves the recovery rate of manganese in end point molten steel, reduces cost waste and improves the performance of steel; the time and the time for pressing the gun at the end point are automatically controlled, the one-time hit rate of the molten steel at the end point is improved, the number of secondary blowing furnaces is reduced, and the smelting loss is reduced; the obtained end-point furnace slag is sticky, so that the maintenance of the converter lining is facilitated, the quality of slag splashing furnace protection is improved, and the service life of the converter is effectively prolonged; the invention has great practicability in the converter smelting industry.
Detailed Description
The technical solution of the present patent will be described in further detail with reference to the following embodiments.
According to the end point gun pressing method for improving the recovery rate of the converter alloy, the components and the temperature of molten steel hitting the end point at one time are improved by accurately judging the time of pressing the gun at the end point, the number of blowing-in furnaces is avoided or reduced, the loss of manganese is reduced, the cost is reduced, and the smelting time is shortened; automatically timing the gun pressing time to ensure that the components and the temperature of the molten steel at the end point are uniform and representative; and analyzing the component fluctuation caused by unstable factors in the smelting operation, and providing reference for adjusting smelting parameters.
In addition, in order to further improve the manganese content in the end-point molten steel, the end-point lance pressing method for improving the alloy recovery rate of the converter can avoid metal splashing during converter smelting by controlling the lance position of the converter, and can effectively prevent the loss of the content of iron monoxide in the slag; the oxidizability of molten steel is greatly reduced by improving the carbon content at the smelting end point; reducing the manganese monoxide in the slag by increasing the temperature of molten steel at the smelting end point, wherein the higher the temperature of the molten steel is, the more beneficial the reduction of the carbon monoxide in the slag is; by reducing the content of ferric oxide in the smelting end-point slag, the viscosity of the slag is effectively reduced, the reaction interface of the steel slag can be reduced, and the oxidation of manganese in molten steel is reduced.
In order to more clearly understand the technical scheme of the invention, the following description is provided for the specific implementation process of the invention. The invention relates to a terminal gun pressing method for improving the recovery rate of converter alloy, which comprises the following steps:
s1, controlling and improving the first-dumping carbon content of the converter when the converter is dumped at first time;
here, the first converter reversing is a pause in the converter smelting process, and the purpose is to know the smelting process conditions in the converter at the moment, such as temperature, components and slagging conditions, so as to determine the accurate molten steel tapping condition; in order to obtain a more standardized end point molten steel, it is preferable to control the carbon content of the converter to 0.085% or more.
S2, ensuring that the content of the ferric oxide in the slag is not too low before the smelting end point of the converter, melting the first batch of slag, and ensuring that the end point slag is well melted;
according to the current operation, preferably, the carbon monoxide content in the slag is ensured to be not lower than 25% two minutes before the smelting endpoint of the converter, which indicates that the slag is more "alive" at the moment, the first batch of slag can be well melted, and the endpoint slag is ensured to be well melted completely.
S3, observing flame and determining that the concentration of carbon monoxide does not exceed a fixed amount on the premise that the lance is away from the molten steel liquid level at the end of the smelting end point of the converter;
preferably, the clear flame can be observed when the lance reaches 1800mm above the molten steel liquid level before the smelting end point of the converter is finished, and the concentration of carbon monoxide is not more than 40 percent.
S4, then lowering the lance position, preferably slowly lowering the lance position to about 1300mm of the liquid level of the molten steel in the actual operation, observing that the flame overflows to a position above a flue, and continuing lowering the lance to a carbon drawing lance position after the flame is clear;
s5, automatically judging gun pressing time and gun pressing time; the oxygen pressure is increased within a certain time, in practical operation, the oxygen pressure is preferably increased to more than 1.10Mpa within 15S, and the smelting end point is waited
S6, carrying out carbon-oxygen reaction before the end of the smelting end point, wherein the temperature of the molten steel is rapidly increased along with the reduction of manganese;
in practical operation, preferably, before the smelting end point is finished for 50S, the carbon-oxygen reaction is carried out and the manganese is reduced, and the temperature of the molten steel is rapidly increased to be more than 1650 ℃.
By adopting the end point lance pressing method for improving the alloy recovery rate of the converter, the smelting end point manganese recovery rate of the converter is obviously improved, the manganese recovery rate is improved to 58.2 percent from the original average 48.8 percent and is improved by 9.4 percent, and the cost is reduced by about 0.56 yuan per square meter according to the calculation of the price of silicon-manganese alloy in the current market; the gun pressing time and time at the end point are automatically controlled, and the one-time hit rate of the smelting end point is improved; the obtained smelting end-point slag is sticky, the maintenance of the converter lining is facilitated, the quality of slag splashing furnace protection is improved, and the service life of the converter is prolonged.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (8)
1. A terminal lance pressing method for improving the recovery rate of converter alloy is characterized in that the composition and temperature of molten steel hitting the terminal point at one time are improved by accurately judging the moment of pressing the lance at the terminal point; the gun pressing time is automatically timed, so that the components and the temperature of the molten steel at the end point are uniform and representative; analyzing component fluctuation caused by unstable factors in smelting operation, and providing reference for adjusting smelting parameters;
the method specifically comprises the following steps:
s1, controlling and improving the one-time carbon content of the converter during one-time converter carbon reversing;
s2, ensuring that the content of the iron monoxide in the slag is not too low before the smelting end point of the converter, melting the first batch of slag, and ensuring that the end point slag is completely melted;
s3, observing flame and determining that the concentration of carbon monoxide does not exceed a fixed amount on the premise that the lance is away from the molten steel liquid level at the end of the smelting end point of the converter;
s4, lowering the lance position, observing the flame overflowing to a position above a flue, and continuing lowering the lance to the carbon drawing lance position after the flame is clear;
s5, automatically judging gun pressing time and gun pressing time; raising the oxygen pressure over a period of time;
and S6, carrying out carbon-oxygen reaction before the end of the smelting end point, wherein the temperature of the molten steel is rapidly increased along with the reduction of manganese.
2. The end-point lance pressing method for improving the alloy recovery rate of the converter according to claim 1, wherein metal splashing during converter smelting is avoided by controlling the lance position of the converter; the oxidizability of molten steel is greatly reduced by improving the carbon content at the smelting end point; reducing manganese monoxide in the slag by increasing the temperature of molten steel at the smelting end point; the content of ferric oxide in the smelting end-point slag is reduced, the viscosity of the slag is reduced, and then the reaction interface of the steel slag is reduced.
3. The end point lance pressing method for improving the recovery rate of converter alloy according to claim 2, wherein in S1, the one-shot carbon content of the converter is controlled to be more than 0.085%.
4. The end point lance pressing method for improving the alloy recovery rate of the converter according to claim 3, wherein in S2, the content of carbon monoxide in the slag is ensured to be not less than 25% two minutes before the end point of the smelting of the converter, the first batch of slag is well melted, and the end point slag is well melted completely.
5. The method of claim 4, wherein in S3, the flame is observed to be clear and the concentration of carbon monoxide is not more than 40% when the lance reaches 1800mm above the molten steel level before the converter smelting end point.
6. The end point lance pressing method for improving the recovery rate of converter alloy according to claim 5, wherein in S4, the lance position is slowly lowered to about 1300mm of the molten steel level.
7. The end point pressure gun method for improving the alloy recovery rate of the converter according to claim 6, wherein in S5, the oxygen pressure is increased to more than 1.10MPa within 15S, and the smelting end point is waited.
8. The end point lance pressing method for improving the alloy recovery rate of the converter according to claim 7, wherein in S6, before 50S from the end point of smelting, the carbon-oxygen reaction is carried out, and the temperature of molten steel is rapidly increased to more than 1650 ℃ along with the reduction of manganese.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944485.4A CN115354110A (en) | 2022-08-08 | 2022-08-08 | Terminal gun pressing method for improving recovery rate of converter alloy |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210944485.4A CN115354110A (en) | 2022-08-08 | 2022-08-08 | Terminal gun pressing method for improving recovery rate of converter alloy |
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| CN115354110A true CN115354110A (en) | 2022-11-18 |
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| CN202210944485.4A Pending CN115354110A (en) | 2022-08-08 | 2022-08-08 | Terminal gun pressing method for improving recovery rate of converter alloy |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050023960A (en) * | 2003-09-04 | 2005-03-10 | 주식회사 포스코 | Method for Refining Pig Iron Containg High Mn |
| KR20130046694A (en) * | 2011-10-28 | 2013-05-08 | 현대제철 주식회사 | Manufacturing method of fe-mn steel with improvement of mangan recovery |
| CN105483314A (en) * | 2016-01-04 | 2016-04-13 | 首钢总公司 | Control method for increasing left manganese content of converter end point |
| CN109385503A (en) * | 2018-12-06 | 2019-02-26 | 云南玉溪仙福钢铁（集团）有限公司 | It protects carbon and protects manganese converter steelmaking process |
| CN114622054A (en) * | 2022-03-04 | 2022-06-14 | 山东钢铁集团永锋临港有限公司 | Method for improving converter end-point manganese ratio |
-
2022
- 2022-08-08 CN CN202210944485.4A patent/CN115354110A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20050023960A (en) * | 2003-09-04 | 2005-03-10 | 주식회사 포스코 | Method for Refining Pig Iron Containg High Mn |
| KR20130046694A (en) * | 2011-10-28 | 2013-05-08 | 현대제철 주식회사 | Manufacturing method of fe-mn steel with improvement of mangan recovery |
| CN105483314A (en) * | 2016-01-04 | 2016-04-13 | 首钢总公司 | Control method for increasing left manganese content of converter end point |
| CN109385503A (en) * | 2018-12-06 | 2019-02-26 | 云南玉溪仙福钢铁（集团）有限公司 | It protects carbon and protects manganese converter steelmaking process |
| CN114622054A (en) * | 2022-03-04 | 2022-06-14 | 山东钢铁集团永锋临港有限公司 | Method for improving converter end-point manganese ratio |
Non-Patent Citations (1)
| Title |
|---|
| 郑毅;胡建光;陈志平;: "150t转炉终点钢水锰含量分析及控制", 炼钢, no. 05, pages 9 - 13 * |
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