CN113201619B - Smelting method for improving desulfurization efficiency of converter - Google Patents
Smelting method for improving desulfurization efficiency of converter Download PDFInfo
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- CN113201619B CN113201619B CN202110539073.8A CN202110539073A CN113201619B CN 113201619 B CN113201619 B CN 113201619B CN 202110539073 A CN202110539073 A CN 202110539073A CN 113201619 B CN113201619 B CN 113201619B
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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
- C21C7/06—Deoxidising, e.g. killing
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/064—Dephosphorising; Desulfurising
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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 smelting method for improving the desulfurization efficiency of a converter, which specifically comprises the following steps: 1) controlling the end point temperature of the converter; 2) deep deoxidation of steel in the converter body; 3) liquid refining slag is added into the molten steel tank in advance; 4) slag washing in the tapping process; 5) after tapping, the molten steel tank is opened to an argon station, 0.6-0.8 Kg/t of metal Ca wire is fed for strong deoxidation, the oxygen content of the molten steel is reduced to be less than or equal to 5ppm, 0.2-0.3 Kg/t of aluminum particles are added for deoxidation at the slag surface after wire feeding, bottom argon blowing is continuously carried out for strong stirring for 5-6 min, sampling is carried out after strong stirring is carried out for 5-6 min, and the desulfurization efficiency is detected; the invention mainly adopts the recycled refining slag to complete the desulfurization in the converter, and moves the desulfurization task forward, thereby effectively realizing the secondary utilization of resources and having good social and economic benefits; the method has high desulfurization efficiency, effectively reduces the content of S after converter argon, can cancel the LF process or reduce the desulfurization pressure of the LF furnace, and saves the refining cost; the method has the advantages of simple and clear process flow, strong operability and easy control.
Description
Technical Field
The invention relates to the technical field of production process equipment of secondary copper, in particular to a smelting method for improving the desulfurization efficiency of a converter.
Background
The sulfur is generally harmful element in steel, and the desulfurization method mainly adopts molten iron pretreatment desulfurization, refining furnace molten steel deep desulfurization, vacuum powder injection desulfurization and the like. The converter is used as main smelting equipment, the main tasks of the converter are decarburization and temperature rise, the final goal of smelting is that the end point carbon, phosphorus and temperature meet the tapping condition, the converter has good dephosphorization capability, but the converter desulfurization capability is very limited in the conventional smelting mode. According to the development trend of the current converter, the high efficiency of converter operation and the high index of converter manufacturing capability are the main directions of converter development, therefore, the adoption of the low iron loss mode has the main characteristics of the converter material structure of most iron and steel enterprises, but brings many defects, and the elimination of hot metal pretreatment desulphurization and slagging-off is one of the main countermeasures for reducing heat loss in order to make up for the heat loss of the converter in the low iron loss mode. However, pretreatment desulfurization is cancelled for molten iron, the original charged sulfur of the converter is increased along with the increase of the original charged sulfur of the converter, and the charged sulfur of the converter is increased due to large amount of scrap steel because the molten iron is not subjected to slag skimming, so that the difficulty is increased for the desulfurization of the converter, and the final sulfur of the converter is high. How to deal with the effective desulfurization of the converter after the pretreatment desulfurization of the molten iron is cancelled needs the support of a new technology. Through the research on the LF furnace molten steel deep desulfurization process, the LF furnace deep desulfurization mainly depends on liquid slag with high alkalinity and good fluidity, after refined slag is manufactured, rapid desulfurization can be realized through strong stirring, and through the research on the converter and the refining process, the LF refined slag can be recycled, the rapid desulfurization of the converter is realized, and the comprehensive desulfurization efficiency of the converter is improved.
Disclosure of Invention
The invention aims to provide a brand-new smelting method for improving the desulfurization efficiency of a converter aiming at the situation, and the method can realize high-efficiency and quick desulfurization.
The specific scheme of the invention is as follows: a smelting method for improving the desulfurization efficiency of a converter specifically comprises the following steps:
1) controlling the end point temperature of the converter: limiting the end point temperature, wherein the end point temperature is required to be controlled to be more than or equal to 1630 ℃;
2) deep deoxidation of steel in the converter body: when converter blowing reaches a terminal point and tapping conditions are met, adding strong deoxidizer Al particles into the converter, wherein the dosage of an aluminum ingot per ton of steel is 3-3.5 Kg, quickly controlling acid-soluble aluminum components in molten steel to 0.050-0.080% before tapping, and reducing the oxygen content of the molten steel to be less than or equal to 30ppm in advance before tapping;
3) adding liquid refining slag into a molten steel tank in advance: adding 8-10 Kg/t of liquid refining slag into a molten steel tank, wherein the liquid refining slag comprises the following components: 50-55% of CaO, 5-8% of SiO2, 17-25% of Al2O3, 8-10% of MgO, and less than or equal to 1.5% of FeO and MnO, and also comprises CaS and P2O 5;
4) slag washing in the tapping process: after adding the liquid refining slag, adding 0.2-0.5 Kg/t of aluminum particles into the molten steel tank again, and opening the molten steel tank to a steel tapping position for steel receiving, wherein argon is blown from the bottom of the molten steel tank in the steel tapping process to perform strong stirring so as to promote desulfurization reaction, the flow of bottom blowing gas is controlled at 500-800 NL/min in the strong stirring process, and argon is blown from the bottom in the whole steel tapping process;
5) after tapping, the molten steel tank is opened to an argon station, 0.6-0.8 Kg/t of metal Ca wire is fed for strong deoxidation, the oxygen content of the molten steel is reduced to be less than or equal to 5ppm, 0.2-0.3 Kg/t of aluminum particles are added for deoxidation at the slag surface after wire feeding, bottom blowing argon is continuously and strongly stirred for 5-6 min, and after strong stirring for 5-6 min, sampling is carried out, and the desulfurization efficiency is detected.
Further, in the invention, the Al content of the aluminum ingot in the step 2) is more than or equal to 99.5%.
Further, the liquid refining slag in the step 3) is ladle top slag after the continuous casting of the front furnace.
Further, in the present invention, the Ca content of the Ca metal wire in the step 5) is 90%, and the others are Fe.
The invention has the following beneficial effects:
1) the invention mainly adopts the recycled refining slag to complete the desulfurization in the converter, moves the desulfurization task forward, effectively realizes the secondary utilization of resources and has good social and economic benefits.
2) The method has high desulfurization efficiency, effectively reduces the content of S after argon in the converter, can cancel the LF process or reduce the desulfurization pressure of the LF furnace, and saves the refining cost.
3) The method has the advantages of simple and clear process flow, strong operability and easy control.
Detailed Description
The technical solutions of the present invention will be described clearly and completely in the following description with reference to the actual situations, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The invention relates to a smelting method for improving the desulfurization efficiency of a converter, which specifically comprises the following steps:
1) controlling the end point temperature of the converter: limiting the end point temperature, wherein the end point temperature is required to be controlled to be more than or equal to 1630 ℃;
2) deep deoxidation of steel in the converter body: when converter blowing reaches a terminal point and tapping conditions are met, adding strong deoxidizer Al particles into the converter, wherein the dosage of an aluminum ingot per ton of steel is 3-3.5 Kg, quickly controlling acid-soluble aluminum components in molten steel to 0.050-0.080% before tapping, and reducing the oxygen content of the molten steel to be less than or equal to 30ppm in advance before tapping;
3) liquid refining slag is added in advance into a molten steel tank: adding 8-10 Kg/t of liquid refining slag into a molten steel tank, wherein the liquid refining slag comprises the following components: 50-55% of CaO, 5-8% of SiO2, 17-25% of Al2O3, 8-10% of MgO, and less than or equal to 1.5% of FeO and MnO, and also comprises CaS and P2O 5;
4) slag washing in the tapping process: after the liquid refining slag is added, 0.2-0.5 Kg/t of aluminum particles are added into the molten steel tank again, the molten steel tank is opened to a steel tapping position to receive steel, argon is blown from the bottom of the molten steel tank in the steel tapping process to perform strong stirring so as to promote desulfurization reaction, the flow of bottom blowing gas is controlled to be 500-800 NL/min in the strong stirring process, and argon is blown from the bottom in the whole steel tapping process;
5) after tapping, the molten steel tank is opened to an argon station, 0.6-0.8 Kg/t of metal Ca wire is fed for strong deoxidation, the oxygen content of the molten steel is reduced to be less than or equal to 5ppm, 0.2-0.3 Kg/t of aluminum particles are added for deoxidation at the slag surface after wire feeding, bottom blowing argon is continuously and strongly stirred for 5-6 min, and after strong stirring for 5-6 min, sampling is carried out, and the desulfurization efficiency is detected.
Further, in the embodiment, the content of Al in the aluminum ingot in the step 2) is not less than 99.5%.
Further, in this embodiment, the liquid refining slag in step 3) is ladle top slag after the continuous casting of the front furnace.
Further, the Ca content of the metal Ca wire in the step 5) described in this example was 90%, and the others were Fe.
The following is the comparison of the advantages of the smelting method before and after the improvement:
the present invention will be further described with reference to specific examples, but the present invention is not limited to the following examples.
Example 1:
furnace number 1, converter end point sulfur content: w (S)%: 0.048 percent.
1) The requirement of the converter end temperature is as follows: high temperature is favorable for desulfurization, and the end point temperature is limited, which is 1630 ℃.
2) Deep deoxidation of steel in the converter body: when converter blowing reaches the end point and meets the tapping condition, adding strong deoxidizer Al particles (the Al content of an aluminum ingot is more than or equal to 99.5 percent) into the converter, wherein the dosage of the aluminum ingot per ton of steel is 3Kg, quickly controlling the acid-soluble aluminum content in the molten steel to 0.050 percent before tapping, and fixing oxygen before tapping, wherein the oxygen content of the molten steel is 30 ppm.
3) Adding liquid refining slag into a molten steel tank in advance: 8Kg/t of liquid refining slag (liquid refining slag is ladle top slag after the continuous casting of the front furnace) is added into the molten steel tank, and the liquid refining slag comprises 50 percent of CaO, 5 percent of SiO2, 17 percent of Al2O3, 8 percent of MgO, 1.5 percent of FeO and MnO, and the balance of CaS, P2O5 and the like.
4) Slag washing in the tapping process: after adding the liquid refining slag, adding 0.2Kg/t of aluminum particles into the molten steel tank, and opening the molten steel tank to a steel tapping position for steel receiving, blowing argon at the bottom of the molten steel tank in the steel tapping process to perform strong stirring so as to promote desulfurization reaction, wherein the flow of bottom blowing gas is 500NL/min in the strong stirring process, and blowing argon at the bottom in the whole steel tapping process.
5) After tapping, the molten steel tank is opened to an argon station, Ca wire is fed for strong deoxidation at 0.6Kg/t, the oxygen content is determined to be 5ppm, aluminum particles are added for deoxidation at 0.2Kg/t after wire feeding, bottom blowing argon is continuously and strongly stirred for 5min, and after strong stirring for 5min, sampling is carried out, w (S)%: 0.019 percent, and the desulfurization efficiency reaches 60 percent after the strong stirring from the converter terminal point to the argon station is finished.
Example 2:
furnace number 1, converter end point sulfur content: w (S)%: 0.049 percent.
1) The requirement of the converter end temperature is as follows: the high temperature is beneficial to desulfurization, the end point temperature is limited, and the end point temperature is controlled to be 1640 ℃.
2) Deep deoxidation of steel in the converter body: when the converter blowing reaches the end point and meets the tapping condition, adding strong deoxidizer Al particles (the Al content of an aluminum ingot is more than or equal to 99.5 percent) into the converter, wherein the dosage of the aluminum ingot per ton of steel is 3.2Kg, quickly controlling the acid-soluble aluminum content in the molten steel to be 0.065 percent before tapping, and determining oxygen before tapping, wherein the oxygen content of the molten steel is 20 ppm.
3) Adding liquid refining slag into a molten steel tank in advance: 9Kg/t of liquid refining slag (liquid refining slag, namely ladle top slag after the front furnace continuous casting is finished) is added into the molten steel tank, and the liquid refining slag comprises 52 percent of CaO, 6 percent of SiO2, 20 percent of Al2O3, 9 percent of MgO, 1.0 percent of FeO + MnO, and the balance of CaS, P2O5 and the like.
4) Slag washing in the tapping process: after adding the liquid refining slag, adding 0.3Kg/t of aluminum particles into the molten steel tank, starting the molten steel tank to a steel tapping position to receive steel, blowing argon at the bottom of the molten steel tank in the steel tapping process to perform strong stirring to promote desulfurization reaction, blowing gas at the bottom in the strong stirring process at a flow rate of 600NL/min, and blowing argon at the bottom in the whole steel tapping process.
5) After tapping, the molten steel tank is opened to an argon station, 0.7Kg/t of metal Ca wire is fed for strong deoxidation, the oxygen content is 3ppm, 0.25Kg/t of slag surface of aluminum particles is added for deoxidation after wire feeding, bottom blowing argon is continuously and strongly stirred for 5.5min, after strong stirring for 5.5min, sampling is carried out, w (S)% is 0.015%, and the desulfurization efficiency is 69% after the converter is finished and the argon station is strongly stirred.
Example 3:
furnace number 1, converter end point sulfur content: w (S)%: 0.052 percent.
1) The requirement of the converter end temperature is as follows: the high temperature is favorable for desulfurization, limits the end point temperature, and the end point temperature is 1650 ℃.
2) Deep deoxidation of steel in the converter body: when converter blowing reaches the end point and meets the tapping condition, adding strong deoxidizer Al particles (the Al content of an aluminum ingot is more than or equal to 99.5 percent) into the converter, wherein the dosage of the aluminum ingot per ton of steel is 3.5Kg, quickly controlling the acid-soluble aluminum content in the molten steel to 0.080 percent before tapping, and fixing oxygen before tapping, wherein the oxygen content of the molten steel is 10 ppm.
3) Adding liquid refining slag into a molten steel tank in advance: 10Kg/t of liquid refining slag (liquid refining slag, namely ladle top slag after the front furnace continuous casting is finished) is added into the molten steel tank, and the liquid refining slag comprises 55 percent of CaO, 8 percent of SiO2, 25 percent of Al2O3, 10 percent of MgO, 0.8 percent of FeO and MnO, and the balance of CaS, P2O5 and the like.
4) Slag washing in the tapping process: after adding the liquid refining slag, adding 0.5Kg/t of aluminum particles into the molten steel tank, starting to a steel tapping position to receive steel, blowing argon at the bottom of the molten steel tank in the steel tapping process to perform strong stirring to promote desulfurization reaction, blowing gas at the bottom of the molten steel tank in the strong stirring process with the flow of 800NL/min, and blowing argon at the bottom of the whole steel tapping process.
5) After tapping, the molten steel tank is opened to an argon station, Ca wire is fed for strong deoxidation at 0.8Kg/t, the oxygen content is determined to be 2ppm, aluminum particles are added for deoxidation at 0.2Kg/t after wire feeding, bottom blowing argon is continuously and strongly stirred for 5min, and after strong stirring for 5min, sampling is carried out, w (S)%: 0.013 percent, and the desulfurization efficiency is 75 percent when the strong stirring is finished from the converter terminal to the argon station.
The comprehensive desulfurization rate of the converter can reach 60-75%, while the conventional mode basically has no desulfurization capability and the desulfurization rate is only 2%.
Claims (4)
1. A smelting method for improving the desulfurization efficiency of a converter is characterized by comprising the following steps: the method specifically comprises the following steps:
1) controlling the end point temperature of the converter: limiting the end point temperature, wherein the end point temperature is required to be controlled to be more than or equal to 1630 ℃;
2) deep deoxidation of steel in the converter body: when converter blowing reaches a terminal point and tapping conditions are met, adding strong deoxidizer Al particles into the converter, wherein the dosage of an aluminum ingot per ton of steel is 3-3.5 Kg, quickly controlling acid-soluble aluminum components in molten steel to 0.050-0.080% before tapping, and reducing the oxygen content of the molten steel to be less than or equal to 30ppm in advance before tapping;
3) adding liquid refining slag into a molten steel tank in advance: adding 8-10 Kg/t of liquid refining slag into a molten steel tank, wherein the liquid refining slag comprises the following components: CaO content of 50-55%, SiO 2 5-8% of Al 2 O 3 17 to 25 percent of the total content of the magnesium oxide, 8 to 10 percent of the MgO, less than or equal to 1.5 percent of the FeO and the MnO, and also comprises CaS and P 2 O 5 ；
4) Slag washing in the tapping process: after adding the liquid refining slag, adding 0.2-0.5 Kg/t of aluminum particles into the molten steel tank again, and opening the molten steel tank to a steel tapping position for steel receiving, wherein argon is blown from the bottom of the molten steel tank in the steel tapping process to perform strong stirring so as to promote desulfurization reaction, the flow of bottom blowing gas is controlled at 500-800 NL/min in the strong stirring process, and argon is blown from the bottom in the whole steel tapping process;
5) after tapping, the molten steel tank is opened to an argon station, 0.6-0.8 Kg/t of metal Ca wire is fed for strong deoxidation, the oxygen content of the molten steel is reduced to be less than or equal to 5ppm, 0.2-0.3 Kg/t of aluminum particles are added for deoxidation at the slag surface after wire feeding, bottom blowing argon is continuously and strongly stirred for 5-6 min, and after strong stirring for 5-6 min, sampling is carried out, and the desulfurization efficiency is detected.
2. The smelting method for improving the desulfurization efficiency of the converter according to claim 1, wherein: the Al content of the aluminum ingot in the step 2) is more than or equal to 99.5 percent.
3. The smelting method for improving the desulfurization efficiency of the converter according to claim 1, wherein: the liquid refining slag in the step 3) is ladle top slag after the continuous casting of the front furnace.
4. The smelting method for improving the desulfurization efficiency of the converter according to claim 1, wherein: the Ca content of the metal Ca wire in the step 5) is 90 percent, and the rest is Fe.
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| CN114045376A (en) * | 2021-10-18 | 2022-02-15 | 首钢集团有限公司 | Method for desulfurizing molten steel in converter tapping process |
| CN114622053B (en) * | 2022-03-31 | 2023-01-24 | 宝武集团鄂城钢铁有限公司 | Smelting method for efficient desulfurization at converter end point |
| CN115820984A (en) * | 2022-11-30 | 2023-03-21 | 河北荣信钢铁有限公司 | Desulfurization slagging agent and converter steelmaking desulfurization process |
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| JP5876168B2 (en) * | 2012-03-13 | 2016-03-02 | 鞍鋼股▲ふん▼有限公司Ａｎｇａｎｇ Ｓｔｅｅｌ Ｃｏｍｐａｎｙ Ｌｉｍｉｔｅｄ． | Low cost clean steel manufacturing method |
| CN102851443B (en) * | 2012-09-19 | 2014-09-17 | 武汉钢铁(集团)公司 | Method for increasing continuous casting heats of aluminum-deoxidized bearing steel |
| CN105112651A (en) * | 2015-09-28 | 2015-12-02 | 攀枝花钢城集团有限公司 | High-aluminum slag modifier pellets and production method thereof |
| CN110157854A (en) * | 2019-06-04 | 2019-08-23 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the deoxidation of molten steel alloying in converter |
| CN111893242B (en) * | 2020-08-12 | 2022-02-01 | 宝武集团鄂城钢铁有限公司 | Smelting method for deep desulfurization of low-aluminum steel |
| CN111926137B (en) * | 2020-08-12 | 2021-11-09 | 宝武集团鄂城钢铁有限公司 | Preparation method for producing ship plate by adopting high-phosphorus, high-arsenic and high-sulfur molten iron |
| CN112322837B (en) * | 2020-11-05 | 2022-02-01 | 马鞍山钢铁股份有限公司 | Smelting process for efficient slagging and desulfurization of LF (ladle furnace) aluminum killed steel |
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