CN115287404A - Pretreatment method of molten iron in converter - Google Patents
Pretreatment method of molten iron in converter Download PDFInfo
- Publication number
- CN115287404A CN115287404A CN202210905827.1A CN202210905827A CN115287404A CN 115287404 A CN115287404 A CN 115287404A CN 202210905827 A CN202210905827 A CN 202210905827A CN 115287404 A CN115287404 A CN 115287404A
- Authority
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- Prior art keywords
- converter
- nitrogen
- molten iron
- blowing
- added
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 130
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 65
- 238000002203 pretreatment Methods 0.000 title claims abstract description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 105
- 238000007664 blowing Methods 0.000 claims abstract description 45
- 238000006477 desulfuration reaction Methods 0.000 claims abstract description 24
- 230000023556 desulfurization Effects 0.000 claims abstract description 24
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 23
- 238000000034 method Methods 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 21
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 21
- 239000001301 oxygen Substances 0.000 claims abstract description 21
- 239000000463 material Substances 0.000 claims abstract description 14
- 239000002893 slag Substances 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims abstract description 7
- 229910052757 nitrogen Inorganic materials 0.000 claims description 41
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 7
- 239000010436 fluorite Substances 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- OBOXTJCIIVUZEN-UHFFFAOYSA-N [C].[O] Chemical compound [C].[O] OBOXTJCIIVUZEN-UHFFFAOYSA-N 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 7
- 239000007924 injection Substances 0.000 abstract description 7
- 239000002131 composite material Substances 0.000 abstract description 6
- 229910052717 sulfur Inorganic materials 0.000 abstract description 6
- 239000011593 sulfur Substances 0.000 abstract description 6
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 abstract description 5
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 abstract description 5
- 239000000843 powder Substances 0.000 abstract description 3
- 229910052751 metal Inorganic materials 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract description 2
- 238000003723 Smelting Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 6
- 230000003009 desulfurizing effect Effects 0.000 description 5
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 4
- 238000005266 casting Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000005997 Calcium carbide Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005262 decarbonization Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010907 mechanical stirring Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000003607 modifier Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009331 sowing Methods 0.000 description 1
- 239000002436 steel type Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- CLZWAWBPWVRRGI-UHFFFAOYSA-N tert-butyl 2-[2-[2-[2-[bis[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]amino]-5-bromophenoxy]ethoxy]-4-methyl-n-[2-[(2-methylpropan-2-yl)oxy]-2-oxoethyl]anilino]acetate Chemical compound CC1=CC=C(N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)C(OCCOC=2C(=CC=C(Br)C=2)N(CC(=O)OC(C)(C)C)CC(=O)OC(C)(C)C)=C1 CLZWAWBPWVRRGI-UHFFFAOYSA-N 0.000 description 1
- 230000000007 visual effect Effects 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
- 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
- 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
- C21C5/35—Blowing from above and through the bath
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention relates to a pretreatment method of converter molten iron, wherein molten iron which is not pretreated is directly added into a converter, the converter is shaken to a zero position after iron addition, a desulfurization slag making material is added, and the molten iron is subjected to airflow stirring by bottom blowing nitrogen gas and nitrogen gas blowing by matching with an oxygen lance so as to be subjected to desulfurization treatment. The present invention is different from the composite blowing and KR methods. Compared with composite injection, the method saves the consumption of desulfurization powder; compare in KR desulfurization, saved hot metal pretreatment equipment investment, got rid of the place restriction. And airflow stirring is adopted in the converter, and the advantages of the converter and KR are utilized to desulfurize, so that the constraint of magnesium powder is removed, the cost is reduced, and the sulfur content of the desulfurized molten iron is less than 0.025%.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for pretreating molten iron in a converter.
Background
The molten iron pretreatment methods of steel mills include a composite blowing method and a KR method, and the restriction of magnesium powder cannot be removed from enterprises using composite blowing along with the continuous rising of the price of the magnesium powder. The KR method does not use magnesium powder in the treatment process, so that the KR method has better price advantage but large equipment investment.
CN201710957691.8 provides a production method of low-sulfur and low-phosphorus steel, which adopts a double converter process to carry out dephosphorization and decarbonization treatment on molten iron, firstly adds a desulfurizer into the molten iron, carries out mechanical stirring method desulfurization KR desulfurization treatment, and then carries out slag skimming and dephosphorization.
CN202110426655.5 method for desulfurizing semi-steel-making converter after furnace, adding calcium carbide and slag modifier into steel ladle in the course of tapping to desulfurize.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for pretreating the molten iron in the converter, which saves the consumption of the desulphurization powder and the investment of molten iron pretreatment equipment.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for pretreating the molten iron in converter includes such steps as directly adding the molten iron to converter, adding desulfurizing slag, bottom blowing nitrogen, and oxygen gun for blowing nitrogen.
The carbon oxygen product of the converter is less than or equal to 0.000020.
Before the iron charging of the converter, the nitrogen flow at the bottom of the converter is 1-4 m 3 Min, adjusting the flow rate of bottom-blown nitrogen to 4-6 m during iron mixing 3 Min; after the desulfurization slag-making material is added, the flow rate of bottom-blown nitrogen is adjusted to 7-9 m 3 Min; after the desulfurization slag-making material is added, the oxygen lance is blown with nitrogen, and the flow of the bottom-blown nitrogen is adjusted to 10-13 m 3 Min; after the oxygen lance finishes the nitrogen blowing, the flow of the bottom-blown nitrogen is adjusted to 14 to 16m 3 /min。
The desulfurization slag-making materials are active lime and fluorite, and the addition amount of the active lime of 14-16 kg/t steel and the fluorite of 3-5 kg/t steel.
The nitrogen gas injected by the oxygen lance is in a slag splashing mode, and the flow rate is 49000-51000 Nm 3 Blowing nitrogen gas at a gun position of 300cm + -50 cm for 1min + -10 s, adjusting the gun position to 250cm + -50 cm, blowing nitrogen gas for 1min + -10 s, and blowing nitrogen gas at a gun position of 200cmBlowing nitrogen gas at + -50 cm for 1min + -10 s.
And after the oxygen lance finishes blowing the nitrogen, continuously blowing the nitrogen at the bottom for 3-5 min.
Compared with the prior art, the invention has the beneficial effects that:
the present invention is different from the composite blowing and KR methods. Compared with composite injection, the consumption of the desulfurization powder is saved; compare in KR desulfurization, saved hot metal pretreatment equipment investment, got rid of the place restriction. And airflow stirring is adopted in the converter, and the advantages of the converter and KR are utilized to desulfurize, so that the constraint of magnesium powder is removed, the cost is reduced, and the sulfur content of the desulfurized molten iron is less than 0.025%.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example 1
Smelting steel seed Q235B, and the finished product requirement (%): s is less than or equal to 0.025 percent; the process route is as follows: converter-ANS-casting machine. The pretreatment method of the converter molten iron comprises the following steps:
1) Smelting molten iron, wherein the temperature of the molten iron is 1325 ℃, and the sulfur content of the molten iron is 0.029%;
2) Selecting nitrogen by blowing from the bottom of the furnace before adding iron, wherein the flow rate is 2m 3 Permin, adding molten iron into a converter, wherein the weight of the molten iron is 265 tons; 6 visual bottom guns of the converter, the carbon oxygen product of the converter is 0.000016;
3) Selecting nitrogen as bottom blowing gas during iron adding, and adjusting flow to 5m 3 Min; after iron is added, the converter is shaken to the zero position, the converter is added with desulfurization slag-making materials, 4t of active lime and 0.9/t of fluorite, and the bottom blowing gas flow is adjusted to 8m 3 /min；
After the desulfurization slag-making material is added, the nitrogen is blown by a lower oxygen lance, the slag splashing mode is adopted, and the flow is fixed at 500000Nm 3 Blowing nitrogen gas at the gun position of 300cm for 1min, adjusting the gun position to 250cm, blowing nitrogen gas for 1min, and finally blowing nitrogen gas at the gun position of 200cm for 1min. Oxygen of converterAfter the nitrogen injection of the gun was completed, the flow rate of bottom-blown nitrogen was adjusted to 11m 3 Min; after the oxygen lance finishes the nitrogen gas injection, the flow of bottom-blown nitrogen gas is adjusted to 15m 3 And/min, continuing bottom blowing and stirring for 5min, discharging the molten iron into a molten iron tank, and delivering the desulfurized molten iron into another converter for smelting.
And after desulfurization treatment, sampling, and desulfurizing the molten iron to 0.022%.
Example 2
Smelting steel type A, finished product requirement (%): s is less than or equal to 0.025 percent; the process route is as follows: converter-ANS-casting machine. The pretreatment method of the converter molten iron comprises the following steps:
1) Smelting molten iron, wherein the temperature of the molten iron is 1351 ℃, and the sulfur content of the molten iron is 0.0283%;
2) Selecting nitrogen by blowing from the bottom of the furnace before adding iron, wherein the flow rate is 2m 3 Permin, adding molten iron into the converter, wherein the weight of the molten iron is 258 tons; 5 visible bottom guns of the converter, wherein the carbon oxygen product of the converter is 0.0000171;
3) Selecting nitrogen as bottom blowing gas during iron adding, and adjusting flow to 5m 3 Min; after iron is added, the converter is shaken to the zero position, the converter is added with desulfurization slag making materials, 3.9t of active lime and 0.89/t of fluorite, and the flow of bottom blowing gas is adjusted to 8m 3 /min；
After the desulfurization slag-making material is added, the lower oxygen lance is used for blowing nitrogen, the slag splashing mode is adopted, and the flow is fixed at 500000Nm 3 Blowing nitrogen for 1min at the gun position of 300cm, adjusting the gun position to 250cm, blowing nitrogen for 1min, and finally blowing nitrogen for 1min at the gun position of 200 cm. After the nitrogen gas injection of the converter oxygen lance is finished, the flow of bottom-blown nitrogen gas is adjusted to 11m 3 Min; after the oxygen lance finishes blowing the nitrogen, the flow of the bottom-blown nitrogen is adjusted to 15m 3 And/min, continuing bottom blowing and stirring for 4.9min, discharging the molten iron into a molten iron tank, and delivering the desulfurized molten iron into another converter for smelting.
And sampling after desulfurization treatment, and desulfurizing the molten iron to 0.0213%.
Example 3
Smelting steel seeds SS400, and the finished product requirement (%): s is less than or equal to 0.025 percent; the process route is as follows: converter-ANS-casting machine. The pretreatment method of the converter molten iron comprises the following steps:
1) Smelting molten iron, wherein the temperature of the molten iron is 1345 ℃, and the sulfur content of the molten iron is 0.0303%;
2) Selecting nitrogen by blowing from the bottom of the furnace before adding iron, wherein the flow rate is 2m 3 Min, adding molten iron into a converter, wherein the weight of the molten iron is 251 tons; 5 visible bottom guns of the converter, wherein the carbon oxygen product of the converter is 0.0000183;
3) Selecting nitrogen as bottom blowing gas during iron adding, and adjusting flow to 5m 3 Min; after iron is added, the converter is shaken to the zero position, the converter is added with desulfurization slag making materials, 4.05t of active lime and 0.91/t of fluorite, and the flow of bottom blowing gas is adjusted to 8m 3 /min；
After the desulfurization slag-making material is added, the nitrogen is blown by a lower oxygen lance, the slag splashing mode is adopted, and the flow is fixed at 500000Nm 3 Blowing nitrogen gas at the gun position of 300cm for 1min, adjusting the gun position to 250cm, blowing nitrogen gas for 1min, and finally blowing nitrogen gas at the gun position of 200cm for 1min. After the nitrogen gas injection of the converter oxygen lance is finished, the flow of bottom-blown nitrogen gas is adjusted to 11m 3 Min; after the oxygen lance finishes the nitrogen gas injection, the flow of bottom-blown nitrogen gas is adjusted to 15m 3 And/min, continuing bottom blowing and stirring for 5.1min, discharging the molten iron into a molten iron tank, and delivering the desulfurized molten iron into another converter for smelting.
And (4) sampling after desulfurization treatment, and desulfurizing the molten iron to 0.02236%.
Although exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A pretreatment method of molten iron in a converter is characterized in that the molten iron which is not pretreated is directly added into the converter, the converter is shaken to the zero position after iron adding, a desulfurization slag making material is added, and the molten iron is subjected to air flow stirring by bottom blowing nitrogen and matching with oxygen lance blowing nitrogen, so as to be subjected to desulfurization treatment.
2. The method of claim 1, wherein the carbon to oxygen carbon volume of the converter is less than or equal to 0.000020.
3. The method as recited in claim 1The pretreatment method of the molten iron in the converter is characterized in that the flow rate of nitrogen blown from the bottom of the converter is 1-4 m before the iron is added in the converter 3 Min, adjusting the flow rate of bottom-blown nitrogen to 4-6 m during iron mixing 3 Min; after the desulfurization slag-making material is added, the flow rate of bottom-blown nitrogen is adjusted to 7-9 m 3 Min; after the desulfurization slag-making material is added, the oxygen lance is blown with nitrogen, and the flow of the bottom-blown nitrogen is adjusted to 10-13 m 3 Min; after the oxygen lance finishes the nitrogen blowing, the flow of the bottom-blown nitrogen is adjusted to 14 to 16m 3 /min。
4. The method of claim 1, wherein the desulphurizing slag-making materials are active lime and fluorite, and the active lime is added in an amount of 14-16 kg/t steel, and the fluorite is added in an amount of 3-5 kg/t steel.
5. The method as claimed in claim 3, wherein the nitrogen gas blown by the oxygen lance is in a slag splashing mode, and the flow rate of the nitrogen gas blown by the oxygen lance is 49000-51000 Nm 3 Blowing nitrogen at the gun position of 300cm +/-50 cm for 1min +/-10 s, adjusting the gun position to 250cm +/-50 cm, blowing nitrogen for 1min +/-10 s, and finally blowing nitrogen at the gun position of 200cm +/-50 cm for 1min +/-10 s.
6. The method for pretreating molten iron in a converter according to claim 3, wherein the bottom blowing of nitrogen is continued for 3-5 min after the blowing of nitrogen by the oxygen lance is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210905827.1A CN115287404B (en) | 2022-07-29 | 2022-07-29 | Converter molten iron pretreatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210905827.1A CN115287404B (en) | 2022-07-29 | 2022-07-29 | Converter molten iron pretreatment method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115287404A true CN115287404A (en) | 2022-11-04 |
| CN115287404B CN115287404B (en) | 2023-11-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210905827.1A Active CN115287404B (en) | 2022-07-29 | 2022-07-29 | Converter molten iron pretreatment method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924025A (en) * | 2014-03-27 | 2014-07-16 | 东北大学 | Method for pre-desulfuration of combined-blowing molten iron at top and bottom in ladle |
| CN107513598A (en) * | 2017-07-20 | 2017-12-26 | 首钢集团有限公司 | A kind of molten iron tank deck bottom composite blowing sulfur method |
| CN110205435A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the molten iron pretreatment desulfurizing in converter |
| CN112899440A (en) * | 2021-01-19 | 2021-06-04 | 重庆钢铁股份有限公司 | RH nitrogen-blowing alloying process for accurately controlling nitrogen content of nitrogen-containing steel |
| CN113088612A (en) * | 2021-03-15 | 2021-07-09 | 石家庄钢铁有限责任公司 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
| CN114395660A (en) * | 2021-12-13 | 2022-04-26 | 首钢京唐钢铁联合有限责任公司 | High-titanium low-nitrogen steel for continuous casting and rolling and preparation method thereof |
-
2022
- 2022-07-29 CN CN202210905827.1A patent/CN115287404B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103924025A (en) * | 2014-03-27 | 2014-07-16 | 东北大学 | Method for pre-desulfuration of combined-blowing molten iron at top and bottom in ladle |
| CN107513598A (en) * | 2017-07-20 | 2017-12-26 | 首钢集团有限公司 | A kind of molten iron tank deck bottom composite blowing sulfur method |
| CN110205435A (en) * | 2019-06-04 | 2019-09-06 | 甘肃酒钢集团宏兴钢铁股份有限公司 | A method of the molten iron pretreatment desulfurizing in converter |
| CN112899440A (en) * | 2021-01-19 | 2021-06-04 | 重庆钢铁股份有限公司 | RH nitrogen-blowing alloying process for accurately controlling nitrogen content of nitrogen-containing steel |
| CN113088612A (en) * | 2021-03-15 | 2021-07-09 | 石家庄钢铁有限责任公司 | Method for pretreating and desulfurizing molten iron by using LF (ladle furnace) |
| CN114395660A (en) * | 2021-12-13 | 2022-04-26 | 首钢京唐钢铁联合有限责任公司 | High-titanium low-nitrogen steel for continuous casting and rolling and preparation method thereof |
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| CN115287404B (en) | 2023-11-10 |
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