CN112981046A - Treatment method for controlling tapping and slag discharging of high-temperature peroxidation converter - Google Patents
Treatment method for controlling tapping and slag discharging of high-temperature peroxidation converter Download PDFInfo
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- CN112981046A CN112981046A CN202110177905.6A CN202110177905A CN112981046A CN 112981046 A CN112981046 A CN 112981046A CN 202110177905 A CN202110177905 A CN 202110177905A CN 112981046 A CN112981046 A CN 112981046A
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- tapping
- converter
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- temperature
- molten steel
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- 239000002893 slag Substances 0.000 title claims abstract description 69
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000005502 peroxidation Methods 0.000 title claims abstract description 11
- 238000007599 discharging Methods 0.000 title description 6
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 40
- 239000010959 steel Substances 0.000 claims abstract description 40
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 15
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 10
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 7
- 230000015271 coagulation Effects 0.000 claims abstract description 3
- 238000005345 coagulation Methods 0.000 claims abstract description 3
- 238000007664 blowing Methods 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 abstract description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 230000000903 blocking effect Effects 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009628 steelmaking Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000002436 steel type Substances 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000012966 insertion method Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 150000002978 peroxides Chemical class 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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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
- 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
- C21C7/072—Treatment with gases
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a treatment method for controlling tapping and slagging of a high-temperature peroxidation converter, which is characterized in that when the tapping temperature of the converter is more than or equal to 1680 ℃, and C in molten steel is less than or equal to 0.035 wt%, carbon dioxide gas with a certain flow is blown to a slag surface in the tapping process until tapping is finished, so that the coagulation of the slag surface is promoted, the slag fluidity is reduced, and the slagging amount is reduced. Compared with the prior art, the invention has the beneficial effects that: the invention can obviously reduce the slag discharge amount in the later tapping period of the converter. The heat absorption characteristic of carbon dioxide is skillfully utilized, so that the slag surface is gathered, the slag fluidity is reduced, and the slag discharge amount is reduced. The flow of the carbon dioxide is controlled, and the temperature of the molten steel can be ensured. The method has the advantages of low cost, simple operation, no damage to equipment and no potential safety hazard.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a treatment method for controlling tapping and slag discharging of a high-temperature peroxidation converter.
Background
Nowadays, the converter has been developed into the most common steel-making equipment, and during the tapping process of the converter, by controlling the amount of slag (namely, the amount of slag discharged) flowing into a ladle, the purity of molten steel can be effectively improved, the amount of phosphorus and sulfur returned is reduced, and the oxidation degree of the molten steel is reduced; the dosage of deoxidizer and alloy is reduced; meanwhile, the corrosion to the steel tapping hole and the sliding nozzle liner can be reduced, so that the service life is prolonged.
At present, most of converter steelmaking tapping in domestic steel plants is still read by steelworks according to practice accumulated for many years, the carbon content is determined to meet the requirement of converting steel types according to the difference of colors of slag and molten steel, when the tapping temperature of the converter is more than or equal to 1680 ℃ and the C in the molten steel is less than or equal to 0.035%, the slag is abnormally active, the fluidity is good, the slag is foamed, dense smoke and strong light are generated during tapping, the detection of a manual visual method is not facilitated, the selection of the time for putting the slag dart is possibly influenced, the slag discharging amount is large, and the quality of the molten steel is influenced. And the sliding plate method is adopted for blocking the slag, so that the steel can be tapped with less slag, but the cost is higher. Therefore, the reasonable research on the treatment method of the slag after the converter is the key point for saving the cost in the steelmaking process.
Disclosure of Invention
The invention aims to provide a treatment method for controlling tapping and slagging of a high-temperature peroxide converter, when the tapping temperature of the converter is more than or equal to 1680 ℃, and the C in molten steel is less than or equal to 0.035%, slag is abnormally active and has good fluidity, the slag is foamed, dense smoke and strong light are generated during tapping, the detection of a manual visual method is not facilitated, carbon dioxide is blown to the slag surface, the coagulation of the slag surface is promoted, the fluidity of the slag is reduced, the slag discharging amount is reduced, and the aim of clean steel production is achieved. The method does not increase the smelting time, has cheap raw materials and simple and easy operation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a treatment method for controlling tapping and slagging of a high-temperature peroxidation converter is characterized in that when the tapping temperature of the converter is more than or equal to 1680 ℃ and C in molten steel is less than or equal to 0.035 wt%, carbon dioxide gas with a certain flow is blown to a slag surface in the tapping process until tapping is finished, so that slag surface agglomeration is promoted, slag fluidity is reduced, and the slagging amount is reduced.
The specific method comprises the following steps:
1) in the tapping process of the converter, when the residual molten steel in the converter accounts for 1/2-1/3 of the total molten steel volume, inserting an air gun into the converter, keeping a nozzle of the air gun 90-120 mm away from a slag surface of a tapping hole, and blowing CO2；
2) When the residual molten steel in the furnace accounts for 1/3-1/4 of the total molten steel volume, the air gun is lowered to the slag surface of the steel tapping hole at the height of 60-90 mm to perform horizontal circular motion, and CO is blown at the same time2And finishing tapping.
The CO is2The blowing strength is 35-55 Nm3The slag surface is not turned over in the whole process.
The movement speed of the air gun in the step 2) is 5-7 r/min.
The diameter of the circumference of the air gun which does circular motion in the step 2) is 500 mm-700 mm.
Compared with the prior art, the invention has the beneficial effects that:
the invention can obviously reduce the slag discharge amount in the later tapping period of the converter. The heat absorption characteristic of carbon dioxide is skillfully utilized, so that the slag surface is gathered, the slag fluidity is reduced, and the slag discharge amount is reduced. The flow of the carbon dioxide is controlled, and the temperature of the molten steel can be ensured. The method has the advantages of low cost, simple operation, no damage to equipment and no potential safety hazard.
Drawings
Fig. 1 is a schematic view for checking the thickness of a ladle slag layer.
Detailed Description
The following examples further illustrate embodiments of the present invention.
A treatment method for controlling tapping and slag discharging of a high-temperature peroxidation converter is characterized in that a 3-furnace test is carried out on AH36 steel, a 3-furnace comparison test is carried out with the steel type, and the nominal weight of the converter is 100 t. The final reaction of the amount of slag from tapping to ladle is shown in Table 1. The method comprises the following specific steps:
example 1:
1) in the tapping process of the converter, when the weight of the large tank is 50t (namely 50t of residual molten steel in the converter), inserting an air gun into the converter, and keeping the height of 120mm from the slag surface of a tapping hole;
2) when the weight of the large tank is 67t (namely 33t of residual molten steel in the furnace), the air gun is lowered to the height of 90mm of the slag surface of the steel tapping hole, horizontal circular motion is carried out, the motion speed is 6r/min, and the circular diameter is 700mm until the steel tapping is finished;
3)CO2the blowing strength is 55Nm3The slag surface is not turned over in the whole process.
Example 2:
1) during the tapping process of the converter, when the weight of the large tank is 57t (namely 43t of residual molten steel in the converter), inserting an air gun into the converter, and keeping the height of 105mm from the slag surface of a tapping hole;
2) when the weight of the large tank is 71t (namely 29t of residual molten steel in the furnace), the air gun is lowered to the height of 75mm of the slag surface of the steel tapping hole, horizontal circular motion is carried out, the motion speed is 6r/min, and the circular diameter is 600mm until the steel tapping is finished;
3)CO2the blowing strength is 45Nm3The slag surface is not turned over in the whole process.
Example 3:
1) during the tapping process of the converter, when the weight of the large tank is 67t (namely 33t of residual molten steel in the converter), inserting an air gun into the converter, and keeping the height of 90mm from the slag surface of a tapping hole;
2) when the weight of the large tank is 75t (namely 25t of residual molten steel in the furnace), the air gun is lowered to the slag surface of the steel tapping hole for 60mm, horizontal circular motion is carried out, the motion speed is 6r/min, and the circular diameter is 500mm until the steel tapping is finished;
3)CO2the blowing strength is 35Nm3The slag surface is not turned over in the whole process.
And 6 furnaces in total are respectively used for performing carbon dioxide blowing tests in the 1 st, 2 nd and 3 rd furnace tapping processes, the slag dart fails in the slag blocking process of the 4 th furnace tapping process, the slag dart succeeds in the slag blocking process of the 5 th furnace tapping process, and the sliding plate method is used for slag blocking in the 6 th furnace tapping process. 5 points (as shown in figure 1) are taken from each ladle, the thickness of the slag layer formed by slag tapping into the ladle is checked by a rod insertion method, and the average slag layer thickness is counted (as shown in table 1).
TABLE 1 six furnaces (test 3 furnace, comparison 3 furnace) ladle slag layer thickness (mm)
Through inspection, compared with a comparative heat, the test steel blown with carbon dioxide has good slag stopping effect without a sliding plate method although the thickness of each point of the slag layer and the average slag layer in the ladle are thick. But the effect of successfully blocking the slag by using the slag-blocking mark is slightly better, and the manual throwing of the slag-blocking mark fails with a certain probability due to the high-temperature environment in the tapping process. Therefore, the invention has obvious implementation effect, promotes the slag surface to agglomerate, reduces the slag fluidity, reduces the slag discharge and saves the cost.
Claims (5)
1. A treatment method for controlling tapping and slagging of a high-temperature peroxidation converter is characterized in that when the tapping temperature of the converter is more than or equal to 1680 ℃ and C in molten steel is less than or equal to 0.035 wt%, carbon dioxide gas is blown to a slag surface in the tapping process until tapping is finished, so that the coagulation of the slag surface is promoted, the fluidity of slag is reduced, and the slagging amount is reduced.
2. The treatment method for controlling the tapping and slagging of the high-temperature peroxidation converter according to claim 1, is characterized by comprising the following steps:
1) in the tapping process of the converter, when the residual molten steel in the converter accounts for 1/2-1/3 of the total molten steel volume, inserting an air gun into the converter, keeping a nozzle of the air gun 90-120 mm away from a slag surface of a tapping hole, and blowing CO2；
2) When the residual molten steel in the furnace accounts for 1/3-1/4 of the total molten steel volume, the air gun is lowered to the slag surface of the steel tapping hole at the height of 60-90 mm to perform horizontal circular motion, and CO is blown at the same time2And finishing tapping.
3. The method as claimed in claim 1, wherein the CO is introduced into the steel for controlling tapping and slagging of the high-temperature peroxidation converter2The blowing strength is 35-55 Nm3。
4. The method for controlling tapping and slagging of a high-temperature peroxidation converter according to claim 1, wherein the air gun in step 2) is moved in a circular motion at a speed of 5-7 r/min.
5. The method for controlling tapping and slagging of a high-temperature peroxidation converter according to claim 1, wherein the air gun in step 2) is in circular motion with a circular diameter of 500mm to 700 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110177905.6A CN112981046B (en) | 2021-02-09 | 2021-02-09 | Treatment method for controlling tapping and slag discharging of high-temperature peroxide converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110177905.6A CN112981046B (en) | 2021-02-09 | 2021-02-09 | Treatment method for controlling tapping and slag discharging of high-temperature peroxide converter |
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| Publication Number | Publication Date |
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| CN112981046A true CN112981046A (en) | 2021-06-18 |
| CN112981046B CN112981046B (en) | 2022-09-16 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4456477A (en) * | 1982-05-28 | 1984-06-26 | Sumitomo Metal Industries, Inc. | Production of ultra-low phosphorus steel |
| JPH01129921A (en) * | 1987-11-13 | 1989-05-23 | Nkk Corp | Steel tapping hole for converter |
| WO2008068916A1 (en) * | 2006-12-08 | 2008-06-12 | Sumitomo Metal Industries, Ltd. | Process for producing extra-low-sulfur low-nitrogen high-cleanliness steel through melting |
| CN102146491A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | CO is adopted at the last stage of converter blowing2Clean steel smelting method for supplementing decarburization |
| CN102146493A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | CO injection of electromagnetic induction furnace2Decarburization clean steel smelting method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN109593906A (en) * | 2018-12-31 | 2019-04-09 | 王虎 | One kind bessemerizing terminal pretreatment of slag new process |
-
2021
- 2021-02-09 CN CN202110177905.6A patent/CN112981046B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4456477A (en) * | 1982-05-28 | 1984-06-26 | Sumitomo Metal Industries, Inc. | Production of ultra-low phosphorus steel |
| JPH01129921A (en) * | 1987-11-13 | 1989-05-23 | Nkk Corp | Steel tapping hole for converter |
| WO2008068916A1 (en) * | 2006-12-08 | 2008-06-12 | Sumitomo Metal Industries, Ltd. | Process for producing extra-low-sulfur low-nitrogen high-cleanliness steel through melting |
| CN102146491A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | CO is adopted at the last stage of converter blowing2Clean steel smelting method for supplementing decarburization |
| CN102146493A (en) * | 2010-02-05 | 2011-08-10 | 鞍钢股份有限公司 | CO injection of electromagnetic induction furnace2Decarburization clean steel smelting method |
| CN109136455A (en) * | 2018-10-15 | 2019-01-04 | 马鞍山钢铁股份有限公司 | A method of it bessemerizing terminal slag bubble and quickly eliminates |
| CN109593906A (en) * | 2018-12-31 | 2019-04-09 | 王虎 | One kind bessemerizing terminal pretreatment of slag new process |
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| CN112981046B (en) | 2022-09-16 |
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