CN111154941B - 9 nickel steel smelting iron adding dust escape prevention method - Google Patents
9 nickel steel smelting iron adding dust escape prevention method Download PDFInfo
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- CN111154941B CN111154941B CN202010127494.5A CN202010127494A CN111154941B CN 111154941 B CN111154941 B CN 111154941B CN 202010127494 A CN202010127494 A CN 202010127494A CN 111154941 B CN111154941 B CN 111154941B
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- China
- Prior art keywords
- iron
- furnace
- molten iron
- converter
- steel
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 159
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 79
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 42
- 239000010959 steel Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 23
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 22
- 238000003723 Smelting Methods 0.000 title claims abstract description 15
- 239000000428 dust Substances 0.000 title claims abstract description 12
- 230000002265 prevention Effects 0.000 title claims abstract description 6
- 239000002184 metal Substances 0.000 claims abstract description 23
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 238000010079 rubber tapping Methods 0.000 claims abstract description 13
- 238000005261 decarburization Methods 0.000 claims abstract description 12
- 238000007599 discharging Methods 0.000 claims abstract description 7
- 238000007664 blowing Methods 0.000 claims abstract description 4
- 239000002893 slag Substances 0.000 claims description 7
- 230000007306 turnover Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 5
- 239000011574 phosphorus Substances 0.000 abstract description 5
- 239000000779 smoke Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C7/068—Decarburising
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to a 9 nickel steel smelting iron adding dust escape prevention method, which comprises the following steps: 1) selecting an empty hot metal ladle for dephosphorization furnace semisteel tapping 3 hours before the dephosphorization furnace is charged with iron, completely charging the molten iron in the hot metal ladle, and baking the molten iron in a hot metal ladle baking device for later use; 2) the total charging weight of the dephosphorization furnace is 105.7 to 106.5 percent of the nominal capacity of the converter; 3) after the blowing of the dephosphorization furnace is finished, immediately placing an empty hot metal ladle on a molten steel tank car, and completely discharging molten steel in the furnace in the process of tapping of the dephosphorization furnace; 4) and (4) adding all the molten iron in the molten iron tank into the decarburization furnace, wherein residual molten iron cannot be obtained in the molten iron tank. The invention has the advantages that: the method solves the problems of iron adding and dust escaping of the decarburization furnace which puzzles the duplex process for producing the 9 nickel steel, stably controls the steel output of the dephosphorization furnace, ensures the normal production of the ultra-low phosphorus steel, reduces the pollution of the 9 nickel steel production to the environment, and straightens the production process of the ultra-low phosphorus steel.
Description
Technical Field
The invention relates to the field of 9 nickel steel smelting, in particular to a method for preventing iron adding and dust leakage in 9 nickel steel smelting.
Background
A steel mill usually adopts a converter duplex process to produce 9 nickel steel, and in the process of adding iron in a decarburization furnace, because the carbon content of semisteel is low, the carbon weight percentage is usually 2.20%, the temperature is controlled at 1400 ℃, a slag layer is not covered, the liquid level of molten iron is exposed, and a large amount of red smoke is generated after the iron adding is finished, so that red smoke is emitted from a steel mill, and multiple environmental-friendly accidents are caused in the process of producing the duplex process. The production of ultra-low phosphorus steel is limited, and the execution of key contracts is influenced.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a method for preventing iron adding and dust emission in 9 nickel steel smelting, which controls the iron adding and smoke emission in 9NI steel smelting under the converter duplex process and protects the production environment.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a9 nickel steel smelting iron adding dust escape prevention method comprises the following steps:
1) selecting an empty hot metal ladle for dephosphorization furnace semisteel tapping 3 hours before the dephosphorization furnace is charged with iron, completely charging the molten iron in the hot metal ladle, and baking the molten iron in a hot metal ladle baking device for later use;
2) the total charging weight of the dephosphorization furnace is 105.7 to 106.5 percent of the nominal capacity of the converter;
3) after the blowing of the dephosphorization furnace is finished, immediately placing an empty hot metal ladle on a molten steel tank car, and completely discharging molten steel in the furnace in the process of tapping of the dephosphorization furnace; in the later period of tapping, the slag discharging amount is controlled to ensure that the semisteel is covered by a slag layer;
4) the molten iron in the molten iron tank is fully blended into the decarburization furnace, and the molten iron tank cannot contain residual molten iron, so that the operation is divided into three conditions:
a, the iron adding amount is less than 105.7 percent of the nominal capacity of the converter, and the total amount of the molten iron added into the converter is supplemented to 105.7 to 106.5 percent of the nominal capacity of the converter by other molten iron tanks;
b, the iron adding amount is more than 106.5 percent of the nominal capacity of the converter, Ni component fine adjustment is carried out according to the iron adding amount which is 106.1 percent of the actual iron adding amount-the nominal capacity of the converter, the adding amount of electrolytic nickel is adjusted, and the weight percentage of the terminal point Ni of the converter is ensured: 9.10 to 9.30 percent of Ni;
c, the iron adding amount is 105.7-106.5 percent of the nominal capacity of the converter, and the decarburization smelting of the converter is directly carried out.
The hot-metal ladle in the step 1) is an online turnover hot-metal ladle with the ladle age less than 500 times.
In the step 2), the material of the dephosphorization furnace is 9.6 to 9.7 weight percent of scrap steel, and the balance is the amount of the charged molten iron.
Compared with the prior art, the invention has the beneficial effects that:
the invention solves the problems of iron adding and dust escaping of the decarburization furnace which troubles the duplex process for producing 9 nickel steel, stably controls the steel output of the dephosphorization furnace, ensures the normal production of the ultra-low phosphorus steel, reduces the pollution of the production of 9 nickel steel to the environment and straightens the production process of the ultra-low phosphorus steel.
Detailed Description
The present invention is described in detail below, but it should be noted that the practice of the present invention is not limited to the following embodiments.
A9 nickel steel smelting iron adding dust escape prevention method comprises the following steps:
1) 3 hours before the dephosphorization furnace is charged with iron, selecting an empty hot metal ladle to carry out dephosphorization furnace semisteel tapping, controlling the weight of the molten iron in the hot metal ladle before the decarburization furnace is charged with iron, completely charging the molten iron in the hot metal ladle, and baking the molten iron in a hot metal ladle baking device for later use; and selecting the hot metal ladle as an online turnover hot metal ladle with the ladle age less than 500 times.
2) In order to control the steel tapping amount of the dephosphorization furnace, the steel tapping amount is matched with the charging amount of the decarburization furnace, so that the iron residue in a molten iron tank after the iron is added by the decarburization furnace is avoided, and the charging amount of the dephosphorization furnace is strictly controlled; the total charging weight of the dephosphorization furnace is 105.7 to 106.5 percent of the nominal capacity of the converter; the material of the dephosphorizing furnace is 9.6 to 9.7 weight percent of scrap steel, and the balance is the amount of molten iron;
if the nominal capacity of the converter is 260 tons, the total charging weight of the dephosphorization furnace is 275-277 tons; 25 tons of scrap steel (15 tons of structural slab scrap steel and 10 tons of pig iron) in the whole iron smelting charging of the dephosphorization furnace, and 250-252 tons of iron charging amount.
3) After the blowing of the dephosphorization furnace is finished, immediately placing an empty hot metal ladle on a molten steel tank car, and completely discharging molten steel in the furnace in the process of tapping of the dephosphorization furnace to obtain no residual steel; in the later period of tapping, the slag discharging amount is controlled to ensure that the semisteel is covered by a slag layer;
4) the molten iron in the molten iron tank is fully blended into the decarburization furnace, and the molten iron tank cannot contain residual molten iron, so that the operation is divided into two conditions:
a, the iron adding amount is less than the nominal capacity of the converter, and the total amount of the molten iron added into the converter is supplemented to the nominal capacity of the converter by other molten iron tanks; if the nominal capacity of the converter is 260 tons, the iron charging amount is less than 260 tons, and at the moment, the total amount of the molten iron charged into the converter is supplemented to 260 tons by other molten iron tanks.
b, the iron adding amount is larger than the nominal capacity of the converter, Ni component fine adjustment is carried out according to the iron adding amount which is the actual iron adding amount-the nominal capacity of the converter, the adding amount of electrolytic nickel is adjusted, and the weight percentage of the terminal point Ni of the converter is ensured: ni is (9.10-9.30)%.
If the nominal capacity of the converter is 260 tons, the iron charging amount is more than 260 tons, Ni component fine adjustment is carried out according to the iron water amount of (actual iron charging amount is-260) tons, the adding amount of electrolytic nickel is adjusted, and the end point Ni of the converter is ensured to be (9.10-9.30)%.
Claims (3)
1. The 9 nickel steel smelting iron adding dust escape prevention method is characterized by comprising the following steps of:
1) selecting an empty hot metal ladle for dephosphorization furnace semisteel tapping 3 hours before the dephosphorization furnace is charged with iron, completely charging the molten iron in the hot metal ladle, and baking the molten iron in a hot metal ladle baking device for later use;
2) the total charging weight of the dephosphorization furnace is 105.7 to 106.5 percent of the nominal capacity of the converter;
3) after the blowing of the dephosphorization furnace is finished, immediately placing an empty hot metal ladle on a molten steel tank car, and completely discharging molten steel in the furnace in the process of tapping of the dephosphorization furnace; in the later period of tapping, the slag discharging amount is controlled to ensure that the semisteel is covered by a slag layer;
4) the molten iron in the molten iron tank is fully blended into the decarburization furnace, and the molten iron tank cannot contain residual molten iron, so that the operation is divided into three conditions:
a, the iron adding amount is less than 105.7 percent of the nominal capacity of the converter, and the total amount of the molten iron added into the converter is supplemented to 105.7 to 106.5 percent of the nominal capacity of the converter by other molten iron tanks;
b, the iron adding amount is more than 106.5 percent of the nominal capacity of the converter, Ni component fine adjustment is carried out according to the iron adding amount which is 106.1 percent of the actual iron adding amount-the nominal capacity of the converter, the adding amount of electrolytic nickel is adjusted, and the weight percentage of the terminal point Ni of the converter is ensured: 9.10 to 9.30 percent of Ni;
c, the iron adding amount is 105.7-106.5 percent of the nominal capacity of the converter, and the decarburization smelting of the converter is directly carried out.
2. The method for preventing iron adding and dust emission in 9 nickel steel smelting according to claim 1, wherein the hot-metal ladle in step 1) is an online turnover hot-metal ladle with the ladle age less than 500 times.
3. The method for preventing iron adding and dust emission in the 9 nickel steel smelting process according to claim 1, wherein the charging of the dephosphorization furnace in the step 2) is 9.6-9.7% by weight of scrap steel, and the balance is the amount of the charged molten iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127494.5A CN111154941B (en) | 2020-02-28 | 2020-02-28 | 9 nickel steel smelting iron adding dust escape prevention method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010127494.5A CN111154941B (en) | 2020-02-28 | 2020-02-28 | 9 nickel steel smelting iron adding dust escape prevention method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111154941A CN111154941A (en) | 2020-05-15 |
| CN111154941B true CN111154941B (en) | 2021-07-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010127494.5A Active CN111154941B (en) | 2020-02-28 | 2020-02-28 | 9 nickel steel smelting iron adding dust escape prevention method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747181A (en) * | 2011-04-18 | 2012-10-24 | 宝山钢铁股份有限公司 | Smelting method of 9Ni steel |
| CN107354360A (en) * | 2017-05-27 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | Refractory H-beams of Q390 containing rare earth and preparation method thereof |
| CN207596886U (en) * | 2017-12-22 | 2018-07-10 | 中天钢铁集团有限公司 | Improve hot-metal bottle dust-arrest device |
| CN207838520U (en) * | 2017-12-30 | 2018-09-11 | 福建三宝钢铁有限公司 | A kind of driving exhaust fume collecting hood for reducing iron making and smoldering |
| CN110042189A (en) * | 2019-04-18 | 2019-07-23 | 宁波钢铁有限公司 | A kind of converter slag-making method of high efficiency dephosphorating |
-
2020
- 2020-02-28 CN CN202010127494.5A patent/CN111154941B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102747181A (en) * | 2011-04-18 | 2012-10-24 | 宝山钢铁股份有限公司 | Smelting method of 9Ni steel |
| CN102747181B (en) * | 2011-04-18 | 2015-01-07 | 宝山钢铁股份有限公司 | Smelting method of 9Ni steel |
| CN107354360A (en) * | 2017-05-27 | 2017-11-17 | 内蒙古包钢钢联股份有限公司 | Refractory H-beams of Q390 containing rare earth and preparation method thereof |
| CN207596886U (en) * | 2017-12-22 | 2018-07-10 | 中天钢铁集团有限公司 | Improve hot-metal bottle dust-arrest device |
| CN207838520U (en) * | 2017-12-30 | 2018-09-11 | 福建三宝钢铁有限公司 | A kind of driving exhaust fume collecting hood for reducing iron making and smoldering |
| CN110042189A (en) * | 2019-04-18 | 2019-07-23 | 宁波钢铁有限公司 | A kind of converter slag-making method of high efficiency dephosphorating |
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| Publication number | Publication date |
|---|---|
| CN111154941A (en) | 2020-05-15 |
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