CN109825665B - Method for reducing carbon and oxygen deposit of molten steel at converter end point - Google Patents
Method for reducing carbon and oxygen deposit of molten steel at converter end point Download PDFInfo
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Abstract
The invention belongs to the technical field of metallurgy, and particularly relates to a method for reducing carbon-oxygen deposit of molten steel at a converter end point. The invention aims to solve the technical problem of providing a method for reducing the carbon-oxygen content of molten steel at the end point of a converter, wherein the carbon-oxygen content is reduced before blowing is stopped by adjusting the oxygen supply strength in the top blowing oxygen blowing process; and then the carbon reduction material, the top gun nitrogen blowing and the bottom blowing stirring are added to adjust the slag for the second time to reduce the carbon oxygen deposit after the top blowing is stopped. The method can reduce the carbon-oxygen deposit of the molten steel at the end point of the converter, thereby achieving the purposes of reducing cost and improving quality.
Description
Technical Field
The invention belongs to the technical field of metallurgy, and particularly relates to a method for reducing carbon-oxygen deposit of molten steel at a converter end point.
Background
The carbon content of the molten steel at the end point of the converter is controlled according to the requirements of steel types during converter smelting, and the carbon content of the molten steel at the end point of the converter is often required to be lower than 0.05 percent during the production of low-carbon and ultra-low-carbon steel so as to facilitate the treatment of the subsequent process. However, after the carbon content of the molten steel is lower at the end point, the oxygen activity of the molten steel is higher, so that the deoxidation cost is high, the lining erosion is fast, and the molten steel inclusion content is higher. Therefore, how to reduce the oxygen activity of the molten steel and further reduce the carbon and oxygen product in the low-carbon interval becomes a research and development hotspot for reducing cost and improving quality.
Carbon oxygen product (m) is based on the C-O reaction ([ C ] O) at a certain temperature and pressure]+[O]A relation between carbon and oxygen, m ═ ω [ C ], obtained from the relation CO ═ C)]×ω[O]K/Pco. When smelting in a converter, the temperature (K) is not changed and the partial pressure (P) of carbon monoxide is not changedCO) At a certain time, the carbon-oxygen concentration product m of the end-point molten steel is a constant. During converter smelting, the oxygen activity of the molten steel at the end point is directly related to the deoxidation alloy cost and the molten steel purity, the oxygen activity of the molten steel is higher, the deoxidation alloy consumption is high, the deoxidation cost is high, and simultaneously, the impurities generated by deoxidation are more, and the molten steel purity is poor. Therefore, reducing the carbon-oxygen content of the end-point molten steel becomes an important measure for reducing the cost and improving the quality of the converter.
The prior art is concerned with controlling the converter end point steelPatent literature reports on water carbon oxygen deposition. CN109182640A 'A method for reducing carbon and oxygen deposit at the smelting end point of a converter', discloses a method for reducing carbon and oxygen deposit at the smelting end point of a converter, which is characterized in that 1.1-1.2 kg of waste magnesia carbon brick ton steel and a fluorite catalyst (20% of the addition amount of magnesia carbon bricks) are added into the converter at the middle and later stages of converter smelting to achieve the purpose of reducing the carbon and oxygen deposit at the smelting end point of the converter, but the invention needs to add fluorite into the converter for fluxing, the addition of the fluorite can seriously erode a furnace lining, and the converter smelting at present basically does not adopt the fluorite. CN104004877A method for reducing carbon and oxygen deposit at converter end point discloses that the control of carbon and oxygen deposit is realized by adjusting gas supply parameters of top blowing and bottom blowing, and the flow of bottom blowing nitrogen or argon is 40-60 m at the earlier stage of smelting3The flow of bottom blowing argon in the middle stage of smelting is 40-60 m3The flow of bottom blowing argon in the later stage of smelting is 70-90 m3The flow rate of bottom-blown argon in the tapping process is 40-60 m3The top-blown oxygen gun position is 1.4-1.8 m, the oxygen flow is 25000-35000 m3And h, controlling the carbon-oxygen deposit energy of the molten steel to be 0.00275-0.0028 at the end point by adopting the method, wherein the invention can not achieve good carbon-oxygen deposit control effect only by optimizing top blowing and bottom blowing parameters, and the effect of reducing the carbon-oxygen deposit of the molten steel with lower carbon content is not obvious.
Disclosure of Invention
The carbon content of the converter end-point molten steel is controlled according to the requirements of steel types during converter smelting, the carbon content of the converter end-point molten steel is required to be lower than 0.05% when low-carbon steel and ultra-low-carbon steel are produced so as to facilitate treatment of the subsequent process, and the invention provides a method for reducing the carbon oxygen content of the molten steel when the carbon content of the molten steel is 0.03-0.04% according to the requirements of the low-carbon steel and the ultra-low-carbon steel. The method can reduce the carbon-oxygen deposit of the molten steel on the premise of meeting the requirement of the carbon content.
The invention discloses a method for reducing carbon and oxygen deposit of molten steel at the end point of a converter, which comprises the following steps:
a. blowing is carried out after the iron is added into the converter, and the oxygen supply intensity of the top-blowing oxygen lance is 3-4 m3/(min·tSteel) The oxygen lance position is 1.3-1.8 m, and the bottom blowing gas strength is 0.03-0.08 m3/(min·tSteel) (ii) a On the topWhen the oxygen blowing progress of the oxygen blowing lance is 90-95%, controlling the oxygen supply intensity of the top blowing lance to be 2-2.5 m3/(min·tSteel) And continuing blowing until the carbon content of the molten steel is below 0.05 percent when the height of the oxygen lance is 1.2-1.5 times of the previous lance position, and ending the blowing;
b. adding a carbonaceous reducing material, and controlling the top-blown oxygen lance to blow nitrogen and bottom-blown gas, wherein the top-blown lance position is 1.0-1.2 m, and the strength is 1.5-2.0 m3/(min·tSteel) The bottom blowing gas supply intensity is 0.01-0.03 m3/(min·tSteel) (ii) a And after the top blowing is finished, bottom blowing is continued for gas supply until tapping is finished.
Specifically, in step a of the method for reducing the carbon-oxygen content of the molten steel at the end point of the converter, the carbonaceous reducing material is anthracite or coke.
Preferably, in the step a of the method for reducing carbon oxygen deposit in molten steel at the end point of the converter, the particle size of the carbonaceous reducing material is 10 to 20 mm.
Preferably, in the step a of the method for reducing carbon oxygen deposit in molten steel at the end point of the converter, the amount of the carbonaceous reducing agent added is 0.8 to 1.5kg/tSteel。
Specifically, in the step a of the method for reducing the carbon-oxygen content of the molten steel at the end point of the converter, the gas of the bottom blowing gas is argon or nitrogen.
Specifically, in the step b of the method for reducing the carbon-oxygen content of the molten steel at the end point of the converter, the gas of the bottom blowing gas is argon or nitrogen.
Preferably, in the step b of the method for reducing carbon-oxygen content of molten steel at the end point of the converter, the time of top blowing is 0.5-1 min.
Preferably, in the step b of the method for reducing carbon-oxygen content of molten steel at the end point of the converter, the time for continuing bottom blowing is 1-2 min.
The method firstly adjusts the oxygen supply intensity through the top blowing oxygen blowing process to reduce the carbon-oxygen deposition before blowing stop (reduce the gas supply intensity at the later stage and reduce the oxygen transfer to the molten steel); and then after top blowing and oxygen blowing are stopped, adding a carbonaceous reducing material as a slag regulating agent, and matching with top gun nitrogen blowing and bottom blowing stirring to regulate slag, thereby secondarily reducing carbon and oxygen deposition. The method can obviously reduce the carbon-oxygen product of the molten steel at the end point, reduce the consumption of deoxidation alloy, reduce the quantity of inclusions in the molten steel and improve the quality of the molten steel.
Detailed Description
The invention provides a method for reducing the carbon-oxygen deposit of end-point molten steel according to the requirement that the final carbon content of molten steel is required to be 0.03-0.04% in certain steel grades. The method firstly controls the carbon mass fraction of the molten steel at the smelting end point to be below 0.05% by adjusting parameters such as top blowing oxygen and the like, then carries out slag regulation by adding a reducing material and changing a top blowing gas supply medium, parameters, bottom blowing parameters and the like, and finally achieves the purpose of reducing the carbon oxygen product of the molten steel at the end point while ensuring the carbon content.
The method specifically comprises the following steps:
blowing: blowing after the iron is added into the converter, wherein the oxygen supply intensity of the top-blown oxygen lance is 3-4 m3/(min·tSteel) The height of the oxygen lance is 1.3-1.8 m, and the strength of argon or nitrogen supplied by bottom blowing is 0.03-0.08 m3/(min·tSteel) When the oxygen blowing progress of the top-blowing oxygen lance is 90-95%, the oxygen supply intensity of the top-blowing oxygen lance is reduced to 2-2.5 m3/(min·tSteel) And raising the height of the oxygen lance to 1.2-1.5 times of the blowing lance position until the carbon content in the molten steel is below 0.05%, and ending oxygen blowing;
slag mixing: after the oxygen blowing is finished, slag adjustment is carried out on the end-point furnace slag, a carbonaceous reducing material is added into the furnace during the slag adjustment, the addition amount of the carbonaceous reducing material is 0.8-1.5 kg per ton of steel, the granularity of the carbonaceous reducing material is 10-20mm, a top-blowing oxygen lance is controlled to blow nitrogen and stir for 0.5-1 min, the lance position is 1.0-1.2 m, and the air supply intensity is 1.5-2.0 m3/(min·tSteel) And during top blowing, simultaneously bottom blowing argon or nitrogen for stirring, wherein the strength is 0.01-0.03 m3/(min·tSteel) (ii) a And (4) after the top blowing is finished, continuing bottom blowing and stirring for 1-2 min, and then tapping.
In the method, the carbon reducing material is added to the slag to react with FeO in the steel slag to generate C + (FeO) ([ Fe ] + CO ═ ≧ so as to reduce FeO in the slag, oxygen in the molten steel after the FeO in the slag is reduced is transferred to the slag, and [ O ] + [ Fe ] ((FeO)) is ([ O ] + [ Fe ] } so as to reduce oxygen in the molten steel, and at the moment, because the carbon content of the molten steel is lower, the carbon-oxygen product of the molten steel is reduced almost, and the oxygen lance nitrogen blowing and the bottom blowing stirring are both used for enhancing the dynamic condition between steel and slag and promoting the rapid progress of the mass transfer reaction between.
In the method, the purpose of adding the carbonaceous reducing material is to carry out slag regulation, and the purpose of top blowing and bottom blowing is to carry out stirring so as to realize full slag regulation. In consideration of the slag removal cost, carbonaceous reducing materials containing carbon are generally used.
Example 1
Making steel in 120t converter of some plant with semisteel, normally blowing after adding iron in converter, and oxygen supply strength of top-blown oxygen lance of 3m3/(min·tSteel) The bottom blowing air supply intensity is 0.03m3/(min·tSteel) The lance position of the blowing oxygen lance is 1.3m, and when the oxygen blowing progress of the top blowing oxygen lance is 90 percent, the oxygen supply intensity of the top blowing oxygen lance is reduced to 2m3/(min·tSteel) And raising the height of the oxygen lance to 1.95m until the oxygen blowing is finished, wherein the carbon content of the molten steel measured at the end of the oxygen blowing is 0.05 percent, and the oxygen activity of the molten steel is 650 × 10-6The carbon oxygen product is 0.00325; after the oxygen blowing is finished, slag adjustment is carried out on the end-point slag, 0.8kg of anthracite (with the carbon content of 92 percent) per ton of steel is added into the furnace during the slag adjustment, the granularity is 10-20mm, the top-blown oxygen lance blows nitrogen after the slag adjustment and is stirred for 0.5min, and the gas supply intensity of the top-blown nitrogen is 1.5m3/(min·tSteel) Bottom blowing argon with intensity of 0.01m3/(min·tSteel) And after stirring for 0.8min by a top lance, stirring for 1min by normal bottom blowing gas supply intensity, and then tapping.
The carbon content of the molten steel is 0.04 percent and the oxygen activity of the molten steel is 450 × 10 measured before tapping-6The carbon oxygen product was 0.0018.
Example 2
120t converter in a certain factory adopts semisteel for steelmaking, the converter is normally blown after iron is added, and the oxygen supply intensity of a top-blown oxygen lance is 3.5m3/(min·tSteel) The bottom blowing air supply intensity is 0.05m3/(min·tSteel) The lance position of the blowing oxygen lance is 1.5m, and when the oxygen blowing progress of the top blowing oxygen lance is 92 percent, the oxygen supply intensity of the top blowing oxygen lance is reduced to 2.3m3/(min·tSteel) And raising the lance position of the oxygen lance to 1.8m until oxygen blowing is finished. The carbon content of the molten steel at the end point of oxygen blowing is measured to be 0.04 percent,the oxygen activity of molten steel is 800 × 10-6The carbon oxygen product is 0.0032; after the oxygen blowing is finished, slag is adjusted to the end-point slag, 1kg of anthracite (with the carbon content of 92 percent) per ton steel is added into the furnace during slag adjustment, the granularity is 10-20mm, after the slag adjustment, the top-blowing oxygen lance blows nitrogen and is stirred for 0.8min, and the gas supply intensity of the top-blowing nitrogen is 1.8m3/(min·tSteel) Bottom blowing argon with intensity of 0.02m3/(min·tSteel) After stirring for 0.6min by using a top lance, stirring for 1.5min by using normal bottom blowing gas supply intensity, and then tapping, wherein the carbon content of the molten steel is measured to be 0.033% and the oxygen activity of the molten steel is measured to be 600 × 10 before tapping-6The carbon oxygen product was 0.00198.
Example 3
120t converter in a certain factory adopts semisteel for steelmaking, the converter is normally blown after iron is added, and the oxygen supply intensity of a top-blown oxygen lance is 4m3/(min·tSteel) The bottom blowing strength is 0.08m3/(min·tSteel) The lance position of the converting oxygen lance is 1.8m, and when the oxygen blowing progress of the top-blowing oxygen lance is 95 percent, the oxygen supply intensity of the top-blowing oxygen lance is reduced to 2.5m3/(min·tSteel) And raising the lance position of the oxygen lance to 2.34m until the oxygen blowing is finished, wherein the carbon content of the molten steel at the end point is measured to be 0.032% and the oxygen activity of the molten steel is 1100 × 10 at the end of the oxygen blowing-6The carbon oxygen product was 0.00352; after the oxygen blowing is finished, slag is adjusted to the end-point slag, 1.5kg of anthracite (with the carbon content of 93 percent) per ton of steel is added into the furnace during slag adjustment, the granularity is 10-20mm, after the slag adjustment, nitrogen is blown by a top-blowing oxygen lance for stirring for 1min, and the gas supply intensity of the top-blowing nitrogen is 2.0m3/(min·tSteel) Bottom blowing argon with intensity of 0.03m3/(min·tSteel) Stirring for 0.9min by using a top lance, then stirring for 2min by using normal bottom blowing gas supply intensity, and then tapping, wherein the carbon content of molten steel is measured to be 0.030% and the oxygen activity of the molten steel is measured to be 690 × 10 before tapping-6The carbon oxygen product was 0.00207.
Claims (19)
1. The method for reducing the carbon-oxygen deposit of the molten steel at the end point of the converter is characterized by comprising the following steps: the method comprises the following steps:
a. blowing is carried out after the iron is added into the converter, and the oxygen supply intensity of the top-blowing oxygen lance is 3-4 m3/(min·tSteel) The oxygen lance position is 1.3-1.8 m, and the bottom blowing gas strength is 0.03-0.08 m3/(min·tSteel) (ii) a When the oxygen blowing progress of the top-blowing oxygen lance is 90-95%, controlling the oxygen supply intensity of the top-blowing oxygen lance to be 2-2.5 m3/(min·tSteel) And continuing blowing until the carbon content of the molten steel is below 0.05 percent when the height of the oxygen lance is 1.2-1.5 times of the previous lance position, and ending the blowing;
b. adding a carbonaceous reducing material, and controlling the top-blown oxygen lance to blow nitrogen and bottom-blown gas, wherein the top-blown lance position is 1.0-1.2 m, and the strength is 1.5-2.0 m3/(min·tSteel) The bottom blowing gas supply intensity is 0.01-0.03 m3/(min·tSteel) (ii) a And after the top blowing is finished, bottom blowing is continued for gas supply until tapping is finished.
2. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1, wherein: in the step b, the carbonaceous reducing material is anthracite or coke.
3. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1 or 2, wherein: in the step b, the particle size of the carbonaceous reducing material is 10-20 mm.
4. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1 or 2, wherein: in the step b, the addition amount of the carbonaceous reducing material is 0.8-1.5 kg/tSteel。
5. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 3, wherein: in the step b, the addition amount of the carbonaceous reducing material is 0.8-1.5 kg/tSteel。
6. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1 or 2, wherein: in the step a, the gas for bottom blowing gas is argon or nitrogen.
7. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 3, wherein: in the step a, the gas for bottom blowing gas is argon or nitrogen.
8. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 4, wherein: in the step a, the gas for bottom blowing gas is argon or nitrogen.
9. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 5, wherein: in the step a, the gas for bottom blowing gas is argon or nitrogen.
10. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1 or 2, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
11. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 3, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
12. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 4, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
13. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 5, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
14. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 6, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
15. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 7, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
16. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 8, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
17. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 9, wherein: in the step b, the gas for bottom blowing gas is argon or nitrogen.
18. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1, wherein: in the step b, the time of top blowing is 0.5-1 min.
19. The method for reducing carbon and oxygen content in molten steel at the end point of a converter according to claim 1, wherein: in the step b, the time for continuing bottom blowing is 1-2 min.
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| CN110129512A (en) * | 2019-06-17 | 2019-08-16 | 河钢股份有限公司承德分公司 | A kind of final slag modifier and converter semi-steel making finishing slag method for modifying |
| CN112626312B (en) * | 2020-12-14 | 2022-09-20 | 山东钢铁集团日照有限公司 | Low-carbon aluminum killed steel Al for reducing RH single process 2 O 3 Method of inclusion |
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