CN113215345A - Method for controlling slag discharge and rephosphorization in converter tapping process - Google Patents
Method for controlling slag discharge and rephosphorization in converter tapping process Download PDFInfo
- Publication number
- CN113215345A CN113215345A CN202110380458.4A CN202110380458A CN113215345A CN 113215345 A CN113215345 A CN 113215345A CN 202110380458 A CN202110380458 A CN 202110380458A CN 113215345 A CN113215345 A CN 113215345A
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- CN
- China
- Prior art keywords
- slag
- converter
- molten steel
- dolomite particles
- tapping
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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
-
- 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
- C21C7/076—Use of slags or fluxes as treating agents
-
- 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 the technical field of steel making, in particular to a method for controlling slag tapping and phosphorus recovery in the converter tapping process, which comprises the following steps: s1) continuously monitoring the tapping process of the converter; s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance; s3) separating the molten steel from the thickened material. The slagging agent is dolomite particles, wherein the content of CaO in the dolomite particles is 52%, and the content of MgO in the dolomite particles is 40%. Compared with the existing slag former, the technical means for reducing rephosphorization is realized by using dolomite particles, the slag former has the characteristics of low cost, easy and accurate control of the input amount, easy operation and the like, and the dolomite particles have higher thick slag efficiency and better stability than other slag formers; in addition, by adding dolomite particles, the amount of phosphorus return is effectively reduced, so that the production risk is reduced, the yield is improved, and the production cost is saved.
Description
Technical Field
The invention relates to the technical field of steel making, in particular to a method for controlling slag tapping and phosphorus returning in the converter tapping process.
Background
Rephosphorization is a phenomenon in which phosphorus removed in steel production is returned to metal again, so that the phosphorus content in the finished steel is often higher than that in molten steel at the end of smelting, and phosphorus can cause the steel to have a "cold embrittlement" phenomenon and deteriorate the weldability and cold bending property of the steel, and thus phosphorus is a harmful element for most steels.
Under the influence of external condition change, the phosphorus pentoxide ratio in the slag system is linearly increased at present, and the method for solving the phosphorus return phenomenon at present is to reduce the flow control of argon in a molten steel tank of a slag tapping furnace and reduce the contact effect between steel slag and a molten steel interface by reducing argon blowing of the molten steel tank in the tapping process. However, reducing argon or shutting off argon is likely to cause non-uniformity of temperature and components in molten steel, so that the components of molten steel cannot meet the steel type determination standard, and unqualified products and cost waste are caused. Secondly, after tapping is finished, lime is added into the molten steel tank from a high-level stock bin in a furnace shaking mode, so that the production rhythm is influenced, and the control of the adding amount and the actual field effect have fluctuation.
Therefore, how to reduce the phosphorus content in the finished steel is an urgent problem to be solved in the converter steelmaking technology.
Disclosure of Invention
In order to solve the defects of the prior art, the invention discloses a method for controlling slag discharge and phosphorus recovery in the converter tapping process.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for controlling slag discharging and phosphorus returning in the converter tapping process comprises the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
Further, in step S2, a slag former is charged into the molten steel tank through a high-level bunker by rocking the furnace.
Furthermore, the slag former is uniformly covered on the liquid level of the molten steel in the feeding process.
Further, the slagging agent is dolomite particles, wherein the content of CaO in the dolomite particles is 52%, and the content of MgO in the dolomite particles is 40%.
Further, in step S2, the slag former is added to the ladle after tapping is completed.
Furthermore, the slagging agent has a particle structure, and the particle diameter is 3-10 mm.
Further, the adding amount of the slagging agent is 60-90 kg.
Further, the feeding speed of the slagging agent is 180 kg/min.
Compared with the prior art, the invention has the beneficial effects that:
1. the dolomite particles are used as the slagging agent, so that the dolomite slag has the characteristics of low cost, easiness in accurately controlling the adding amount, easiness in operation and the like, has higher slag thickening efficiency compared with other slagging agents, and has better stability than other slagging agents; meanwhile, because the dolomite particles have high slag thickening speed, impurities in molten steel can be effectively reduced, phosphorus pentoxide in the slag can be reduced to be converted into a phosphorus simple substance, and the reduction amount of the rephosphorization of the dolomite particles can be increased by 5-10% compared with other slagging agents through field data collection and analysis.
2. By adding dolomite particles, the amount of phosphorus return is effectively reduced, so that the production risk is reduced, the yield is improved, and the production cost is saved.
3. Dolomite particles are added by operators after tapping is finished, so that the loss of production joining time can be reduced, and the working efficiency is improved.
Detailed Description
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The invention will now be further illustrated with reference to the following examples:
example one
A method for controlling slag discharging and phosphorus returning in the converter tapping process comprises the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
In step S2, the slag former is added to the ladle after tapping is completed.
The slagging agent is put into a molten steel tank by an operator in a mode of rocking a furnace by utilizing a high-level bin.
In order to achieve better dissolving efficiency, operators uniformly cover the liquid level of the molten steel with the slagging agent in the feeding process, the feeding speed of the slagging agent is 180kg/min, and the slagging agent is dissolved through the temperature of the steel slag.
Specifically, the slagging agent is dolomite particles, wherein the dolomite particles comprise 52% of CaO, 40% of MgO and the balance of impurities.
Specifically, the dolomite particles adopt a particle structure with a small volume, and the diameter of the dolomite particles is 3 mm; the adding amount of the dolomite particles is 60 kg.
Example two
A method for controlling slag discharging and phosphorus returning in the converter tapping process comprises the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
In step S2, the slag former is added to the ladle after tapping is completed.
The slagging agent is put into a molten steel tank by an operator in a mode of rocking a furnace by utilizing a high-level bin.
In order to achieve better dissolving efficiency, operators uniformly cover the liquid level of the molten steel with the slagging agent in the feeding process, the feeding speed of the slagging agent is 180kg/min, and the slagging agent is dissolved through the temperature of the steel slag.
Specifically, the slagging agent is dolomite particles, wherein the dolomite particles comprise 52% of CaO, 40% of MgO and the balance of impurities.
The diameter of the dolomite particles thrown in the embodiment is 10 mm; the input amount of dolomite particles is 60 kg.
EXAMPLE III
A method for controlling slag discharging and phosphorus returning in the converter tapping process comprises the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
In step S2, the slag former is added to the ladle after tapping is completed.
The slagging agent is put into a molten steel tank by an operator in a mode of rocking a furnace by utilizing a high-level bin.
In order to achieve better dissolving efficiency, operators uniformly cover the liquid level of the molten steel with the slagging agent in the feeding process, the feeding speed of the slagging agent is 180kg/min, and the slagging agent is dissolved through the temperature of the steel slag.
Specifically, the slagging agent is dolomite particles, wherein the dolomite particles comprise 52% of CaO, 40% of MgO and the balance of impurities.
The diameter of the dolomite particles in the embodiment is 3 mm; the adding amount of dolomite particles is 90 kg.
Example four
A method for controlling slag discharging and phosphorus returning in the converter tapping process comprises the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
In step S2, the slag former is added to the ladle after tapping is completed.
The slagging agent is put into a molten steel tank by an operator in a mode of rocking a furnace by utilizing a high-level bin.
In order to achieve better dissolving efficiency, operators uniformly cover the liquid level of the molten steel with the slagging agent in the feeding process, the feeding speed of the slagging agent is 180kg/min, and the slagging agent is dissolved through the temperature of the steel slag.
Specifically, the slagging agent is dolomite particles, wherein the dolomite particles comprise 52% of CaO, 40% of MgO and the balance of impurities.
The diameter of the dolomite particles in the embodiment is 10 mm; the adding amount of dolomite particles is 90 kg.
Through field data collection and analysis of four groups of embodiments, when the diameter of dolomite particles is 3mm and the input amount is 90kg, the dissolving efficiency of the dolomite particles is highest, the dissolving balance is achieved, and the measured rephosphorization amount in molten steel is lowest; compared with other slagging agents, the diameter and the adding amount of the dolomite particles can increase the reduction amount of the rephosphorization by 5-10 percent in the actual production.
Compared with the existing slag former, the technical means for reducing rephosphorization is realized by using dolomite particles, the slag former has the characteristics of low cost, easy and accurate control of the input amount, easy operation and the like, and the dolomite particles have higher thick slag efficiency and better stability than other slag formers; meanwhile, because the dolomite particles have high slag thickening speed, the impurities in the molten steel can be effectively reduced, and the phosphorus pentoxide in the slag can be reduced to be converted into a phosphorus simple substance.
In addition, by adding dolomite particles, the amount of rephosphorization is effectively reduced, so that the production risk is reduced, the yield is improved, and the production cost is saved; dolomite particles are added by operators after tapping is finished, so that the loss of production joining time can be reduced, and the working efficiency is improved.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (8)
1. A method for controlling slag discharging and phosphorus returning in the converter tapping process is characterized by comprising the following steps:
s1) continuously monitoring the tapping process of the converter;
s2), discharging slag from the molten steel tank in the tapping process, and adding a slag former into the molten steel tank to dissolve the slag former and mix the slag former with steel slag to form a thickened substance;
s3) separating the molten steel from the thickened material.
2. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: in step S2, a slag former is charged into the ladle through a head bin by rocking the ladle.
3. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 2, characterized in that: the slag former is uniformly covered on the liquid level of the molten steel in the feeding process.
4. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: the slagging agent is dolomite particles, wherein the content of CaO in the dolomite particles is 52%, and the content of MgO in the dolomite particles is 40%.
5. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: in step S2, the slag former is put into the ladle after tapping is completed.
6. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: the slagging agent is of a particle structure, and the diameter of each particle is 3-10 mm.
7. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: the adding amount of the slagging agent is 60-90 kg.
8. The method for controlling slagging and rephosphorization during tapping of the converter as claimed in claim 1, characterized in that: the feeding speed of the slagging agent is 180 kg/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110380458.4A CN113215345A (en) | 2021-04-09 | 2021-04-09 | Method for controlling slag discharge and rephosphorization in converter tapping process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110380458.4A CN113215345A (en) | 2021-04-09 | 2021-04-09 | Method for controlling slag discharge and rephosphorization in converter tapping process |
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| CN113215345A true CN113215345A (en) | 2021-08-06 |
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| CN202110380458.4A Pending CN113215345A (en) | 2021-04-09 | 2021-04-09 | Method for controlling slag discharge and rephosphorization in converter tapping process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807510A (en) * | 2022-05-09 | 2022-07-29 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling rephosphorization in tapping process of high-titanium molten iron smelted by converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423879A (en) * | 2007-10-31 | 2009-05-06 | 鞍钢股份有限公司 | Smelting method of low-phosphorus steel |
| CN108611461A (en) * | 2018-06-12 | 2018-10-02 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing semi-steel making rephosphorization |
-
2021
- 2021-04-09 CN CN202110380458.4A patent/CN113215345A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423879A (en) * | 2007-10-31 | 2009-05-06 | 鞍钢股份有限公司 | Smelting method of low-phosphorus steel |
| CN108611461A (en) * | 2018-06-12 | 2018-10-02 | 攀钢集团攀枝花钢铁研究院有限公司 | The method for reducing semi-steel making rephosphorization |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114807510A (en) * | 2022-05-09 | 2022-07-29 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling rephosphorization in tapping process of high-titanium molten iron smelted by converter |
| CN114807510B (en) * | 2022-05-09 | 2023-05-12 | 首钢水城钢铁（集团）有限责任公司 | Method for controlling rephosphorization in converter smelting high-ferrotitanium tapping process |
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Application publication date: 20210806 |
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