CN113604727A - Smelting method for improving yield of scrap steel metal based on BOF-CC process - Google Patents
Smelting method for improving yield of scrap steel metal based on BOF-CC process Download PDFInfo
- Publication number
- CN113604727A CN113604727A CN202110916065.0A CN202110916065A CN113604727A CN 113604727 A CN113604727 A CN 113604727A CN 202110916065 A CN202110916065 A CN 202110916065A CN 113604727 A CN113604727 A CN 113604727A
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- China
- Prior art keywords
- steel
- ladle
- scrap
- temperature
- scrap steel
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C33/00—Making ferrous alloys
- C22C33/04—Making ferrous alloys by melting
- C22C33/06—Making ferrous alloys by melting using master alloys
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
- B22D41/01—Heating means
- B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
-
- 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
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
Abstract
The invention relates to a smelting method for improving the yield of scrap steel metal based on a BOF-CC process, which comprises the following steps: s1, selecting a red steel ladle with the inner wall temperature higher than 800 ℃, filling a steel ladle sliding water gap and keeping closed, then putting the manufactured steel ladle into a ladle car, and adding 20-30kg of diversion sand into the steel ladle water gap; s2, selecting scrap steel; s3, adding scrap steel; s4, opening the coal-oxygen lance to bake the steel scrap in the ladle for 10-15 min; s5, making the molten steel components of the converter meet the requirements of smelting steel seeds, driving a ladle car to a steel tapping position to receive the molten steel after the temperature of the molten steel reaches 1640-1650 ℃, and opening bottom blowing argon for the ladle; s6, lifting the converter after the molten steel of the converter is discharged, driving the ladle car to a ladle lifting position, and closing the bottom of the ladle to blow argon; s7, hoisting the steel ladle into an LF furnace for fine adjustment of temperature and components, hoisting the steel ladle to a continuous casting machine after the components and the temperature are qualified, and casting the steel ladle into a casting blank; the smelting method improves the metal yield and reduces the power consumption and energy cost.
Description
Technical Field
The invention relates to the technical field of converter smelting processes, in particular to a smelting method for improving the yield of scrap steel metal based on a BOF-CC process.
Background
With the proposal of the green development targets of national carbon peak reaching and carbon neutralization, iron and steel ratio reduction is taken as a main grip for energy conservation and emission reduction by various iron and steel enterprises. At present, the relatively mature method for converter steelmaking is adding scrap steel into a blast furnace, adding scrap steel into a hot metal ladle, increasing the charging amount of the converter scrap steel and the like, which can effectively reduce the iron-steel ratio, but the yield of scrap steel metal is not high, the scrap steel is directly melted by electric furnace steelmaking, although the yield of the scrap steel metal is improved, the energy consumption (electricity consumption) is very high, and the aims of energy conservation and consumption reduction are still difficult to achieve.
Disclosure of Invention
The invention aims to provide a smelting method for improving the metal yield of scrap steel based on a BOF-CC process, aiming at the situation, the smelting method improves the metal yield and reduces the power consumption and energy cost.
The specific scheme of the invention is as follows: a smelting method for improving the yield of scrap steel metal based on a BOF-CC process comprises the following steps:
s1, selecting a red steel ladle with the inner wall temperature higher than 800 ℃, filling a steel ladle sliding water gap and keeping closed, then putting the manufactured steel ladle into a ladle car, and adding 20-30kg of diversion sand into the steel ladle water gap;
s2, selecting scrap steel: the deformed steel bar with the diameter of 10-40mm x 100-500mm is preferably used, and can also be scrap steel generated by trimming the cut edge of the medium plate, the size of 10-40mm x 100-500mm, and the scrap steel is required to be clean and have no residue soil; the steel scrap composition requirement is as follows: c: 0.10 to 0.25%, Si: 0.15 to 0.60%, Mn: 0.50-1.50%, P is less than or equal to 0.040%, S is less than or equal to 0.040%;
s3, adding scrap steel: the first method is as follows: building a bin in an argon station, loading scrap steel, driving a ladle car to the lower part of the argon station scrap steel bin, aligning a ladle to a feed opening of the scrap steel bin, adding 2-5 tons of scrap steel into the ladle, and taking the deformed steel with the diameter phi of 10-40mm plus 100-200 mm as a standard; the second method comprises the following steps: directly pouring the scrap steel in the scrap steel hopper into a ladle through an overhead travelling crane, wherein the size of the scrap steel is 10-40mm 100-500 mm;
s4, opening the coal-oxygen lance to bake the steel scrap in the ladle for 10-15min, so that the temperature of the steel scrap reaches 800-1100 ℃;
s5, making the molten steel components of the converter meet the requirements of smelting steel seeds, driving a ladle car to a tapping position to receive the molten steel after the temperature of the molten steel reaches 1640-1650 ℃, opening bottom blowing argon for the ladle, controlling the flow to be 800-1000L/min, and carrying out deoxidation alloying according to the smelting steel seeds in the tapping process;
s6, lifting the converter after the molten steel of the converter is discharged, driving the ladle car to a ladle lifting position, and closing the bottom of the ladle to blow argon;
and S7, hoisting the steel ladle into an LF furnace for temperature and component fine adjustment, hoisting the steel ladle to a continuous casting machine after the components and the temperature are qualified, and casting the steel ladle into a casting blank.
Further, in the present invention, when the steel ladle receives molten steel tapping in step S4, the molten steel is strongly stirred, and in step S2, there are clear requirements for the size and composition of the scrap; in step S4, there is a clear requirement for the temperature to which the steel scrap is baked after being added to the ladle.
Compared with the metal yield of adding the waste steel before the converter and adding the waste steel in the ladle of the argon station, the invention improves by 10-12%; the ladle scrap steel is baked by utilizing the self-produced converter gas, and compared with an LF furnace or an electric furnace for melting the scrap steel, the power consumption is reduced by 25-30 kwh, and the energy cost is greatly saved.
Detailed Description
The invention relates to a smelting method for improving the yield of scrap steel metal based on a BOF-CC process, which comprises the following steps:
s1, selecting a red steel ladle with the inner wall temperature higher than 800 ℃, filling a steel ladle sliding water gap and keeping closed, then putting the manufactured steel ladle into a ladle car, and adding 20-30kg of diversion sand into the steel ladle water gap;
s2, selecting scrap steel: the deformed steel bar with the diameter of 10-40mm x 100-500mm is preferably used, and can also be scrap steel generated by trimming the cut edge of the medium plate, the size of 10-40mm x 100-500mm, and the scrap steel is required to be clean and have no residue soil; the steel scrap composition requirement is as follows: c: 0.10 to 0.25%, Si: 0.15 to 0.60%, Mn: 0.50-1.50%, P is less than or equal to 0.040%, S is less than or equal to 0.040%;
s3, adding scrap steel: the first method is as follows: building a bin in an argon station, loading scrap steel, driving a ladle car to the lower part of the argon station scrap steel bin, aligning a ladle to a feed opening of the scrap steel bin, adding 2-5 tons of scrap steel into the ladle, and taking the deformed steel with the diameter phi of 10-40mm plus 100-200 mm as a standard; the second method comprises the following steps: directly pouring the scrap steel in the scrap steel hopper into a ladle through an overhead travelling crane, wherein the size of the scrap steel is 10-40mm 100-500 mm;
s4, opening the coal-oxygen lance to bake the steel scrap in the ladle for 10-15min, so that the temperature of the steel scrap reaches 800-1100 ℃;
s5, making the molten steel components of the converter meet the requirements of smelting steel seeds, driving a ladle car to a tapping position to receive the molten steel after the temperature of the molten steel reaches 1640-1650 ℃, opening bottom blowing argon for the ladle, controlling the flow to be 800-1000L/min, and carrying out deoxidation alloying according to the smelting steel seeds in the tapping process;
s6, lifting the converter after the molten steel of the converter is discharged, driving the ladle car to a ladle lifting position, and closing the bottom of the ladle to blow argon;
and S7, hoisting the steel ladle into an LF furnace for temperature and component fine adjustment, hoisting the steel ladle to a continuous casting machine after the components and the temperature are qualified, and casting the steel ladle into a casting blank.
Further, in the present invention, in step S4, when the ladle receives molten steel and taps, the molten steel is strongly stirred.
Embodiments of the present invention are described in detail below with reference to specific parameters.
1. Steel ladle selection: selecting a red ladle with the inner wall temperature of more than 800 ℃ (the first 3 times of the new ladle and the last 10 times of the ladle are not recommended to be used, the temperature drop of molten steel after the steel is tapped from a converter is large, and the BOF-CC process flow is not facilitated to be executed), assembling a ladle sliding nozzle and keeping closed, putting the manufactured ladle into a ladle car, and adding 20-30kg of diversion sand into the ladle nozzle.
2. Selecting scrap steel: the deformed steel with the diameter phi (10-40 mm) × (100-.
Table 1 steel ladle scrap composition
| C | Si | Mn | P | S |
| 0.10-0.25 | 0.15-0.60 | 0.50-1.50 | ≤0.040 | ≤0.040 |
3. Adding scrap steel: the method is characterized in that a scrap steel is built in an argon station, a ladle car is driven to the position below the argon station scrap steel bin, a ladle is aligned to a discharge hole of the scrap steel bin, and 2-4 tons of scrap steel is added into the ladle, so that the size of the scrap steel is required to be generally small, and the optimal deformed steel bar is the deformed steel bar with the diameter phi (10-40 mm) × (100 plus 200) mm. And the second mode is that the scrap steel in the scrap steel hopper is directly poured into a ladle through an overhead traveling crane, and the size of the scrap steel is required to be (10-40) mm (100-500) mm.
4. Baking the scrap steel: and opening the coal-oxygen lance to bake the steel ladle scrap steel for 10-15min, wherein the temperature of the scrap steel reaches 800-1100 ℃, and the influence of the scrap steel on the temperature drop of the molten steel in the tapping process is reduced.
5. The method is applicable to steel grades: HRB400, HPB300, Q355 and the like can be low-alloy steel produced by BOF-CC process flow.
6. The components of the molten steel of the converter meet the requirements of smelting steel seeds, the ladle car is driven to a tapping position to receive the molten steel after the temperature of the molten steel reaches 1640-1650 ℃, bottom blowing argon is started for the ladle, the flow is controlled at 800-1000L/min, the pressure is about 0.8MPa, the argon blowing time lasts for 4-6min, and deoxidation alloying is carried out according to the smelting steel seeds in the tapping process.
7. After the molten steel of the converter is taken out, the converter is lifted, the ladle car is driven to an argon station to carry out bottom argon blowing on the molten steel, the flow rate is controlled to be 200-300L/min, the pressure is about 0.2MPa, the argon blowing time lasts for 5-10min, the components and the temperature of the molten steel are uniform, and the floating of inclusions is promoted.
8. And hoisting the ladle to a continuous casting machine after the components and the temperature are qualified, and casting the molten steel into a casting blank.
Compared with the metal yield of adding the waste steel before the converter and adding the waste steel in the ladle of the argon station, the invention improves by 5-8%; the alloy in the scrap steel is efficiently recycled; the ladle scrap steel is baked by utilizing the self-produced converter gas, the ladle scrap steel is melted by utilizing the strong stirring in the tapping process of the converter, the process of entering an LF (ladle furnace) is cancelled, and compared with an LF (ladle furnace) or an electric furnace for heating and melting the ladle scrap steel, the energy consumption is reduced by 25-30 kwh, and the energy cost is greatly saved.
Claims (2)
1. A smelting method for improving the yield of scrap steel metal based on a BOF-CC process is characterized by comprising the following steps:
s1, selecting a red steel ladle with the inner wall temperature higher than 800 ℃, filling a steel ladle sliding water gap and keeping closed, then putting the manufactured steel ladle into a ladle car, and adding 20-30kg of diversion sand into the steel ladle water gap;
s2, selecting scrap steel: the deformed steel bar with the diameter of 10-40mm x 100-500mm is preferably used, and can also be scrap steel generated by trimming the cut edge of the medium plate, the size of 10-40mm x 100-500mm, and the scrap steel is required to be clean and have no residue soil; the steel scrap composition requirement is as follows: c: 0.10 to 0.25%, Si: 0.15 to 0.60%, Mn: 0.50-1.50%, P is less than or equal to 0.040%, S is less than or equal to 0.040%;
s3, adding scrap steel: the first method is as follows: building a bin in an argon station, loading scrap steel, driving a ladle car to the lower part of the argon station scrap steel bin, aligning a ladle to a feed opening of the scrap steel bin, adding 2-5 tons of scrap steel into the ladle, and taking the deformed steel with the diameter phi of 10-40mm plus 100-200 mm as a standard; the second method comprises the following steps: directly pouring the scrap steel in the scrap steel hopper into a ladle through an overhead travelling crane, wherein the size of the scrap steel is 10-40mm 100-500 mm;
s4, opening the coal-oxygen lance to bake the steel scrap in the ladle for 10-15min, so that the temperature of the steel scrap reaches 800-1100 ℃;
s5, making the molten steel components of the converter meet the requirements of smelting steel seeds, driving a ladle car to a tapping position to receive the molten steel after the temperature of the molten steel reaches 1640-1650 ℃, opening bottom blowing argon for the ladle, controlling the flow to be 800-1000L/min, and carrying out deoxidation alloying according to the smelting steel seeds in the tapping process;
s6, lifting the converter after the molten steel of the converter is discharged, driving the ladle car to a ladle lifting position, and closing the bottom of the ladle to blow argon;
and S7, hoisting the steel ladle into an LF furnace for temperature and component fine adjustment, hoisting the steel ladle to a continuous casting machine after the components and the temperature are qualified, and casting the steel ladle into a casting blank.
2. The smelting method for increasing the metal yield of scrap steel based on the BOF-CC process according to claim 1, wherein the molten steel is subjected to strong stirring treatment when the steel ladle receives the molten steel for tapping in step S4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110916065.0A CN113604727A (en) | 2021-08-11 | 2021-08-11 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110916065.0A CN113604727A (en) | 2021-08-11 | 2021-08-11 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
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| CN113604727A true CN113604727A (en) | 2021-11-05 |
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| CN202110916065.0A Pending CN113604727A (en) | 2021-08-11 | 2021-08-11 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63157808A (en) * | 1986-12-19 | 1988-06-30 | Sumitomo Metal Ind Ltd | Scrap melting method by combined converter |
| KR101443352B1 (en) * | 2013-04-30 | 2014-09-22 | 현대제철 주식회사 | Method for refining molten iron |
| CN107663561A (en) * | 2017-09-25 | 2018-02-06 | 云南曲靖呈钢钢铁（集团）有限公司 | A kind of smelting process of steel scrap stove external heat reuse |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN110396637A (en) * | 2019-08-30 | 2019-11-01 | 武安市裕华钢铁有限公司 | The technique of low cost, short route, high efficiency production SPHC |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111440919A (en) * | 2020-06-01 | 2020-07-24 | 广东韶钢松山股份有限公司 | Argon station scrap steel adding system and scrap steel adding method |
| CN112280927A (en) * | 2020-10-30 | 2021-01-29 | 张家港宏昌钢板有限公司 | Operation method for baking scrap steel in converter |
| CN112708718A (en) * | 2021-01-22 | 2021-04-27 | 辽宁科大科信电力电子有限公司 | Dynamic control method for scrap steel premelting and preheating |
-
2021
- 2021-08-11 CN CN202110916065.0A patent/CN113604727A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63157808A (en) * | 1986-12-19 | 1988-06-30 | Sumitomo Metal Ind Ltd | Scrap melting method by combined converter |
| KR101443352B1 (en) * | 2013-04-30 | 2014-09-22 | 현대제철 주식회사 | Method for refining molten iron |
| CN107663561A (en) * | 2017-09-25 | 2018-02-06 | 云南曲靖呈钢钢铁（集团）有限公司 | A kind of smelting process of steel scrap stove external heat reuse |
| CN109852760A (en) * | 2018-12-03 | 2019-06-07 | 江苏省沙钢钢铁研究院有限公司 | A kind of converter preheating scrap improves the smelting process of scrap ratio |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN110396637A (en) * | 2019-08-30 | 2019-11-01 | 武安市裕华钢铁有限公司 | The technique of low cost, short route, high efficiency production SPHC |
| CN111440919A (en) * | 2020-06-01 | 2020-07-24 | 广东韶钢松山股份有限公司 | Argon station scrap steel adding system and scrap steel adding method |
| CN112280927A (en) * | 2020-10-30 | 2021-01-29 | 张家港宏昌钢板有限公司 | Operation method for baking scrap steel in converter |
| CN112708718A (en) * | 2021-01-22 | 2021-04-27 | 辽宁科大科信电力电子有限公司 | Dynamic control method for scrap steel premelting and preheating |
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Application publication date: 20211105 |
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