CN115652184B - Method for smelting ultra-pure ferrite stainless steel by using slag melting agent in AOD converter - Google Patents
Method for smelting ultra-pure ferrite stainless steel by using slag melting agent in AOD converter Download PDFInfo
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- CN115652184B CN115652184B CN202211539294.6A CN202211539294A CN115652184B CN 115652184 B CN115652184 B CN 115652184B CN 202211539294 A CN202211539294 A CN 202211539294A CN 115652184 B CN115652184 B CN 115652184B
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- 239000002893 slag Substances 0.000 title claims abstract description 76
- 238000002844 melting Methods 0.000 title claims abstract description 63
- 230000008018 melting Effects 0.000 title claims abstract description 55
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 53
- 238000003723 Smelting Methods 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000859 α-Fe Inorganic materials 0.000 title claims abstract description 12
- 229910001220 stainless steel Inorganic materials 0.000 title claims abstract description 11
- 239000010935 stainless steel Substances 0.000 title claims abstract description 11
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 239000011651 chromium Substances 0.000 claims abstract description 17
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims abstract description 16
- 239000010436 fluorite Substances 0.000 claims abstract description 15
- 229910052751 metal Inorganic materials 0.000 claims abstract description 12
- 239000002184 metal Substances 0.000 claims abstract description 12
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052804 chromium Inorganic materials 0.000 claims abstract description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 7
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 7
- 239000010703 silicon Substances 0.000 claims abstract description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 46
- 229910052742 iron Inorganic materials 0.000 claims description 23
- 238000007664 blowing Methods 0.000 claims description 17
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 16
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 12
- 229910052799 carbon Inorganic materials 0.000 claims description 12
- 239000004571 lime Substances 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 10
- 229910000604 Ferrochrome Inorganic materials 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 7
- 238000011282 treatment Methods 0.000 claims description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 6
- 150000001875 compounds Chemical class 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 6
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims description 5
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 5
- 238000005275 alloying Methods 0.000 claims description 5
- 229910052791 calcium Inorganic materials 0.000 claims description 5
- 238000006477 desulfuration reaction Methods 0.000 claims description 5
- 230000023556 desulfurization Effects 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 5
- 238000010079 rubber tapping Methods 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 5
- 229910016569 AlF 3 Inorganic materials 0.000 claims description 4
- 239000000571 coke Substances 0.000 claims description 2
- 239000010459 dolomite Substances 0.000 claims description 2
- 229910000514 dolomite Inorganic materials 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 2
- 238000006722 reduction reaction Methods 0.000 description 18
- 239000011575 calcium Substances 0.000 description 4
- 239000000395 magnesium oxide Substances 0.000 description 4
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 229910052717 sulfur Inorganic materials 0.000 description 3
- KLZUFWVZNOTSEM-UHFFFAOYSA-K Aluminium flouride Chemical compound F[Al](F)F KLZUFWVZNOTSEM-UHFFFAOYSA-K 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- BYFGZMCJNACEKR-UHFFFAOYSA-N aluminium(i) oxide Chemical compound [Al]O[Al] BYFGZMCJNACEKR-UHFFFAOYSA-N 0.000 description 2
- -1 aluminum-fluorine Chemical compound 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 241001062472 Stokellia anisodon Species 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- WGLPBDUCMAPZCE-UHFFFAOYSA-N chromium trioxide Inorganic materials O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 1
- 229940117975 chromium trioxide Drugs 0.000 description 1
- GAMDZJFZMJECOS-UHFFFAOYSA-N chromium(6+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Cr+6] GAMDZJFZMJECOS-UHFFFAOYSA-N 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention provides a method for smelting ultra-pure ferrite stainless steel by using a slag melting agent in an AOD converter, which comprises the steps of adding the slag melting agent in the AOD smelting process, and adding the slag melting agent after the reduction stage is started, so that the slag can be ensured to have good fluidity and proper viscosity, and Cr in silicon reduction slag can be ensured 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved, and under the conditions of shortage of fluorite resources and difficult purchase, a new slag melting product is provided, so that the environmental pollution is reduced, and the production cost of the ultra-pure ferrite stainless steel is reduced.
Description
Technical Field
The invention belongs to the technical field of metal smelting, and relates to a method for smelting ultra-pure ferrite stainless steel by using a slag melting agent in an AOD converter.
Background
When AOD smelting ultra-pure ferrite stainless steel, the oxidation of metals (Cr, fe) is inevitably caused in the oxygen blowing decarburization process, and when the carbon content is removed to the target requirement, a deoxidizer and a slag melting agent are usually added to recover the oxidized metals, so that the metal oxides (Cr 2 O 3 FeO) is replaced back to molten steel again to achieve the purposes of saving raw material cost and preventing environmental pollution. The slag melting agent commonly used in steelmaking at present is mainly fluorite (CaF) 2 ）。
Compared with fluorite which is a traditional slag melting product, the novel slag melting agent product (the slag melting agent is NaF, calcium fluoride (CaF) 2 ) Fluoride such as AlF3 and a compound having a chemical balance of Al2O 3) contributes to the formation of a substantially milky slag at lower temperatures of molten steel; the novel slag melting agent product can improve the solubility of calcium oxide (CaO) and magnesium oxide (MgO) more than fluorite. In addition, by faster and higher performance treatments, the slag-melting agent product can increase the fluidity of the slag even at lower temperatures than metallurgical fluorite.The slag melting agent contributes to the formation of a substantially milky slag at a lower temperature of the molten steel than fluorite; can improve the solubility of calcium oxide (CaO) and magnesium oxide (MgO) more than fluorite. In addition, the slag melting agent can increase the fluidity of slag at a lower temperature than metallurgical fluorite after a faster and higher performance process. As an artificially produced solvent, it is superior to natural mineral fluorite in terms of chemical composition stability.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention aims to provide a slag melting treatment technology which is relatively simple in process, economical and environment-friendly, and is easy to operate and control.
For this purpose, the invention adopts the following technical scheme:
a method for smelting ultra-pure ferrite stainless steel by using slag melting agent in an AOD converter comprises the following steps of
a. And (3) feeding a slag melting agent: feeding a slag melting agent to an AOD converter high-level bin for standby through a belt feeding system, wherein the slag melting agent comprises the following components: 38-45%, na:10-15% of Al 2 O 3 ≤4%、Ca：15%-22%、SiO 2 Less than or equal to 10 percent, and the balance of unavoidable impurities;
b. adding molten iron: pouring molten iron into an AOD converter, wherein the molten iron comprises the following components: 2.5% -4.5%, si: less than or equal to 0.2 percent, mn less than or equal to 0.25 percent, P: less than or equal to 0.025 percent, S: less than or equal to 0.02 percent, and the balance of unavoidable impurities;
c. decarburization and alloying: removing carbon in molten iron by combining oxygen blowing of a top lance and a side blowing lance, and adding any one or more of high-carbon ferrochrome, lime, dolomite and coke in batches and stages in the stage;
d. reduction stage: adding slag-melting agent after the reduction stage is started, wherein the total amount of the slag-melting agent is calculated according to 8-9% of the total amount of lime before reduction, and the total amount of the slag-melting agent is 100-110Nm by a side-blowing gun 3 Argon is blown into the slag for stirring for 4 to 5 minutes in a minute, and the slag is melted by mainly utilizing the compounds consisting of NaF, caF2, alF3 and Al2O3 with certain chemical balance in the slag melting agent, so that the slag has good fluidity and proper viscosityEnsuring Cr in silicon reduction slag 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved;
e. desulfurization stage: according to the sampling components after the reduction is finished, adding a proper amount of lime, fluorite and low-carbon ferrochrome in the stage;
f. tapping: pouring molten steel with the components and the temperature meeting the requirements after smelting into a ladle, and sending the molten steel to a VOD furnace for refining treatment.
The invention has the beneficial effects that:
1. after the slag melting agent is added into the AOD converter, the slag melting speed of hard slag in the converter is high, the slag melting time is shortened, and the time for reduction reaction between silicon in molten steel and chromium trioxide in slag is effectively increased;
2. the invention improves the recovery rate of chromium metal element oxide in slag by using a slag melting agent;
3. the slag melting agent can reduce the mixing cost of the ultra-pure ferrite auxiliary material by more than 25 percent;
4. under the conditions of shortage of fluorite resources and difficulty in purchase, the invention provides another aluminum-fluorine efficient slag melting agent product, so that the use of the aluminum-fluorine efficient slag melting agent for slag melting becomes a technical reserve.
Detailed Description
The technical scheme of the invention is described in the following with reference to the implementation method.
Example 1
A method for smelting ultra-pure ferrite stainless steel by using a slag melting agent in an AOD converter comprises the following steps:
the AOD converter in this example was used to produce 409L steel grade:
a. and (3) feeding a slag melting agent: feeding a slag melting agent to an AOD converter high-level bin for standby through a belt feeding system, wherein the slag melting agent comprises the following components: 38-45%, na:10-15% of Al 2 O 3 ≤4%、Ca：15%-22%、SiO 2 Less than or equal to 10 percent, and the balance of unavoidable impurities;
b. adding molten iron: pouring molten iron into an AOD converter, wherein the molten iron comprises the following components: 3.02%, si:0.04%, mn:0.21%, P:0.008%, S:0.015% of molten iron temperature: 1290 ℃, and the balance of unavoidable impurities;
c. decarburization and alloying: removing carbon content in molten iron to 0.26% by combining oxygen blowing of a top lance and a side blowing lance, and adding 25.422 tons of high-carbon ferrochrome and 7 tons of lime at the stage;
d. reduction stage: 620Kg of slag-melting agent was added after the start of the reduction stage and 100Nm by means of a cross-blowing lance 3 Argon is blown in/min and stirred for 4 minutes, naF and CaF are utilized in the slag melting agent 2 、AlF 3 With Al having a certain chemical balance 2 O 3 The compound is used for melting slag, ensuring that the slag has good fluidity and proper viscosity, and ensuring Cr in the silicon reduction slag 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved. The yield of the metal chromium reaches 97.25%, 421kg of fluorite is effectively replaced, and the average auxiliary material batching cost is reduced by 7.4 yuan/ton of steel;
e. desulfurization stage: according to the sampling components after the reduction is finished, 500Kg of lime and 120Kg of low-carbon ferrochrome are added at the stage according to the flow rate of 100-110Nm 3 Stirring for 3-4 min after blowing argon;
f. tapping: pouring molten steel with the components and the temperature meeting the requirements after smelting into a ladle, and sending the molten steel to a VOD furnace for refining treatment.
Example 2
A method for smelting ultra-pure ferrite stainless steel by using a slag melting agent in an AOD converter comprises the following steps:
the AOD converter in this example was used to make 441 steel grades:
a. and (3) feeding a slag melting agent: feeding a slag melting agent to an AOD converter high-level bin for standby through a belt feeding system, wherein the slag melting agent comprises the following components: 38-45%, na:10-15% of Al 2 O 3 ≤4%、Ca：15%-22%、SiO 2 Less than or equal to 10 percent, and the balance of unavoidable impurities;
b. adding molten iron: pouring molten iron into an AOD converter, wherein the molten iron comprises the following components: 3.59%, si:0.02%, mn:0.1%, P:0.013%, S: less than or equal to 0.015 percent, and the balance of unavoidable impurities, wherein the temperature of molten iron is as follows: 1285 ℃;
c. decarburization and alloying: removing carbon content in molten iron to 0.26% by combining top lance and side blowing lance, and adding 35.7 ton ferrochrome and 8.5 ton lime at this stage;
d. reduction stage: 760Kg of slag-melting agent is added after the reduction stage is started, and 100Nm of slag-melting agent is added by a cross-blowing gun 3 Argon is blown in/min and stirred for 4 minutes, naF and CaF are utilized in the slag melting agent 2 、AlF 3 With Al having a certain chemical balance 2 O 3 The compound is used for melting slag, ensuring that the slag has good fluidity and proper viscosity, and ensuring Cr in the silicon reduction slag 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved, the yield of the metal chromium reaches 97.18%, 335kg of fluorite is effectively replaced, and the average auxiliary material batching cost is reduced by 6.95 yuan/ton of steel;
e. desulfurization stage: according to the sampling component after the reduction is finished, 305Kg of lime is added at the stage, and the flow rate is 105Nm 3 Stirring for 3 min after blowing argon in per min;
f. tapping: pouring molten steel with the components and the temperature meeting the requirements after smelting into a ladle, and sending the molten steel to a VOD furnace for refining treatment.
Example 3
A method for smelting ultra-pure ferrite stainless steel by using a slag melting agent in an AOD converter comprises the following steps:
the AOD converter in this example was used to smelt 439 steel grade:
a. and (3) feeding a slag melting agent: feeding a slag melting agent to an AOD converter high-level bin for standby through a belt feeding system, wherein the slag melting agent comprises the following components: 38-45%, na:10-15% of Al 2 O 3 ≤4%、Ca：15%-22%、SiO 2 Less than or equal to 10 percent, and the balance of unavoidable impurities;
b. adding molten iron: pouring molten iron into an AOD converter, wherein the molten iron comprises the following components: 3.5%, si:0.01%, mn:0.07%, P:0.007%, S: less than or equal to 0.018 percent, and the balance of unavoidable impurities, wherein the temperature of molten iron is as follows: 1280 ℃;
c. decarburization and alloying: oxygen is blown by combining a top lance and a side blowing lance, the carbon content in molten iron is removed to 0.266%, and 36.71 tons of ferrochrome and 9.5 tons of lime are added at the stage;
d. reduction stage: 788Kg of slag-melting agent was added after the start of the reduction stage and the pressure was increased by 100Nm by means of a side-blowing lance 3 Argon is blown in/min and stirred for 4 minutes, naF and CaF are utilized in the slag melting agent 2 、AlF 3 With Al having a certain chemical balance 2 O 3 The compound is used for melting slag, ensuring that the slag has good fluidity and proper viscosity, and ensuring Cr in the silicon reduction slag 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved, the yield of the metal chromium reaches 97.22%, 364kg of fluorite is effectively replaced, and the average auxiliary material batching cost is reduced by 8.47 yuan per ton of steel;
e. desulfurization stage: according to the sampling component after the reduction is finished, 400Kg of lime is added at the stage, and the flow rate is 105Nm 3 Stirring for 3 min after blowing argon in per min;
f. tapping: pouring molten steel with the components and the temperature meeting the requirements after smelting into a ladle, and sending the molten steel to a VOD furnace for refining treatment.
Claims (1)
1. The method for smelting the ultra-pure ferrite stainless steel by using the slag melting agent in the AOD converter is characterized by comprising the following steps of:
a. and (3) feeding a slag melting agent: feeding a slag melting agent to an AOD converter high-level bin for standby through a belt feeding system, wherein the slag melting agent comprises the following components: 38-45%, na:10-15% of Al 2 O 3 ≤4%、Ca：15%-22%、SiO 2 Less than or equal to 10 percent, and the balance of unavoidable impurities;
b. adding molten iron: pouring molten iron into an AOD converter, wherein the molten iron comprises the following components: 2.5% -4.5%, si: less than or equal to 0.2 percent, mn less than or equal to 0.25 percent, P: less than or equal to 0.025 percent, S: less than or equal to 0.02 percent, and the balance of unavoidable impurities;
c. decarburization and alloying: removing carbon in molten iron by combining oxygen blowing of a top lance and a side blowing lance, and adding any one or more of high-carbon ferrochrome, lime, dolomite and coke in batches and stages in the stage;
d. reduction stage: adding a slag melting agent after the reduction stage begins, wherein the total amount of the slag melting agent is according to the total amount of lime before reductionCalculated as 8-9% of the total, and measured at 100-110Nm by a side-blowing gun 3 Argon is blown in/min and stirred for 4-5 min, wherein NaF and CaF are mainly used as slag melting agents 2 、AlF 3 With Al having a certain chemical balance 2 O 3 The compound is used for melting slag, ensuring that the slag has good fluidity and proper viscosity, and ensuring Cr in the silicon reduction slag 2 O 3 The purposes of recovering metal chromium and removing oxygen content in steel are achieved;
e. desulfurization stage: according to the sampling components after the reduction is finished, adding a proper amount of lime, fluorite and low-carbon ferrochrome in the stage;
f. tapping: pouring molten steel with the components and the temperature meeting the requirements after smelting into a ladle, and sending the molten steel to a VOD furnace for refining treatment.
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| CN202211539294.6A CN115652184B (en) | 2022-12-02 | 2022-12-02 | Method for smelting ultra-pure ferrite stainless steel by using slag melting agent in AOD converter |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365949A (en) * | 2017-06-29 | 2017-11-21 | 振石集团东方特钢有限公司 | A kind of method of smelting ultralow-carbon high-alloy stainless steel |
| CN108707722A (en) * | 2018-05-08 | 2018-10-26 | 邢台钢铁有限责任公司 | The slagging method of the double slag technique prereduction stages of AOD furnace |
| CN113943848A (en) * | 2021-10-21 | 2022-01-18 | 中钢设备有限公司 | AOD argon oxygen refining furnace slagging agent and preparation method thereof |
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- 2022-12-02 CN CN202211539294.6A patent/CN115652184B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107365949A (en) * | 2017-06-29 | 2017-11-21 | 振石集团东方特钢有限公司 | A kind of method of smelting ultralow-carbon high-alloy stainless steel |
| CN108707722A (en) * | 2018-05-08 | 2018-10-26 | 邢台钢铁有限责任公司 | The slagging method of the double slag technique prereduction stages of AOD furnace |
| CN113943848A (en) * | 2021-10-21 | 2022-01-18 | 中钢设备有限公司 | AOD argon oxygen refining furnace slagging agent and preparation method thereof |
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