CN116356102A - Slag-forming material for converter blowing, preparation method and converter blowing method - Google Patents
Slag-forming material for converter blowing, preparation method and converter blowing method Download PDFInfo
- Publication number
- CN116356102A CN116356102A CN202310192390.6A CN202310192390A CN116356102A CN 116356102 A CN116356102 A CN 116356102A CN 202310192390 A CN202310192390 A CN 202310192390A CN 116356102 A CN116356102 A CN 116356102A
- Authority
- CN
- China
- Prior art keywords
- slag
- forming material
- converter
- percent
- converter blowing
- 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.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 53
- 238000007664 blowing Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 28
- 238000002360 preparation method Methods 0.000 title claims abstract description 6
- 239000002893 slag Substances 0.000 claims abstract description 29
- 238000000605 extraction Methods 0.000 claims abstract description 14
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 229910052720 vanadium Inorganic materials 0.000 claims abstract description 14
- LEONUFNNVUYDNQ-UHFFFAOYSA-N vanadium atom Chemical compound [V] LEONUFNNVUYDNQ-UHFFFAOYSA-N 0.000 claims abstract description 14
- 239000002699 waste material Substances 0.000 claims abstract description 14
- 239000011819 refractory material Substances 0.000 claims abstract description 11
- 229910052742 iron Inorganic materials 0.000 claims abstract description 8
- 229910018072 Al 2 O 3 Inorganic materials 0.000 claims abstract description 7
- 229910010413 TiO 2 Inorganic materials 0.000 claims abstract description 7
- 239000008187 granular material Substances 0.000 claims abstract description 7
- 229910004298 SiO 2 Inorganic materials 0.000 claims abstract description 6
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims description 18
- 239000000395 magnesium oxide Substances 0.000 claims description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 8
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 8
- 239000004571 lime Substances 0.000 claims description 8
- 239000011419 magnesium lime Substances 0.000 claims description 7
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 238000009628 steelmaking Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000000203 mixture Substances 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 239000011449 brick Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000009749 continuous casting Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 150000007513 acids Chemical class 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011236 particulate material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- C21C5/36—Processes yielding slags of special composition
-
- 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
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
- C21C5/443—Hot fettling; Flame gunning
-
- 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
- C21C7/0645—Agents used for dephosphorising or desulfurising
-
- 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
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 discloses a slag-forming material for converter blowing, a preparation method and a converter blowing method, wherein the converter blowing raw material comprises semisteel subjected to vanadium extraction, the slag-forming material is a granular material prepared from a refractory material of a waste tundish, and the slag-forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 . The invention can improve the slag forming effect, protect the furnace lining, reduce the production cost and reduce the pollution of wastes to the environment.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a slag-forming material for converter blowing, a preparation method and a converter blowing method.
Background
When the semisteel after vanadium extraction is used as a raw material for steelmaking, as [ Si ] and [ Mn ] in molten iron are mostly oxidized during vanadium extraction, few heating elements are caused in the initial stage of converter blowing, the heat energy required for slagging is insufficient, the lime melting speed is low, the initial slag alkalinity is low, the fluidity is poor, the dephosphorization effect is poor, the lining erosion is aggravated, the metal loss is increased, and the splashing is serious.
If the technology of reducing blowing strength and improving FeO in slag is simply adopted to promote lime melting, the smelting period is prolonged, and the matching of converter-continuous casting is difficult, so that the realization of a full-continuous casting production mode is severely restricted. Therefore, it is necessary to study a more suitable slag formation scheme in combination with the process conditions of converter semisteel smelting.
Disclosure of Invention
The invention mainly aims to provide a slag-forming material for converter blowing, a preparation method and a converter blowing method, which are used for solving the technical problem of poor slag-forming effect when vanadium-extracted semisteel is used as a raw material for smelting.
According to one aspect of the invention, a slag-forming material for converter converting is provided, wherein the converter converting raw material comprises semisteel subjected to vanadium extraction, the slag-forming material is granular material prepared from refractory materials of a waste tundish, and the slag-forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
According to one embodiment of the invention, the particle size of the slag-forming material is 10-50 mm.
According to another aspect of the present invention, there is provided a method for preparing a slag-forming material for converter blowing, wherein a converter blowing raw material includes a semisteel after vanadium extraction, the method comprising:
preparing the refractory material of the waste tundish into granular materials as the slag forming material, wherein the slag forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
According to another aspect of the present invention, there is provided a converter converting method, wherein a converter converting raw material includes a semisteel after vanadium extraction, the method comprising:
during converter blowing, slag forming materials according to the above embodiments are added into the converter to perform slag forming.
According to one embodiment of the invention, in the converter blowing process, the slag-forming material, the active lime and the high-magnesium lime with the magnesium oxide content of 20-40 wt% are respectively added into the converter for slag-forming, wherein the mass and the dosage ratio of the slag-forming material, the active lime and the high-magnesium lime are as follows: 20 to 25 percent (3 to 5).
In the embodiment of the invention, the granular material prepared from the refractory material of the waste tundish is used as the slag-forming material, so that the slag-forming effect can be improved and the furnace lining can be protected by utilizing the corresponding chemical components in the slag-forming material, the production cost can be reduced, and the pollution of waste to the environment can be reduced.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention will be described in further detail with reference to specific embodiments.
As mentioned in the above background art, the inventors of the present application have recognized that there is a technical problem in that the slag forming effect is poor when steelmaking is performed using semi-steel after vanadium extraction as a raw material. Meanwhile, in the prior art, main measures for promoting slag formation in the furnace are an external heat source, lowering the melting temperature of primary slag and the like. However, these measures may have adverse effects on other aspects of the steelmaking process, and blowing the metal element with a high calorific value also faces the disadvantage of high cost. Based on these considerations, the present application proposes one or more embodiments as will be described below to develop corresponding environmentally friendly slag forming materials to improve the slag forming effect for the purpose of optimizing the converter semisteel smelting process.
According to one aspect of the invention, a slag-forming material for converter blowing is provided, wherein the converter blowing raw material comprises semisteel after vanadium extraction, the slag-forming material is granular material prepared from refractory materials of a waste tundish, and the slag-forming material comprisesThe slag-forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
In the steelmaking process, the tundish is an intermediate vessel between the ladle and the crystallizer, which comprises refractory material. Molten steel poured from the ladle first enters a tundish and then is distributed to each crystallizer through a tundish nozzle. The slag-forming material is prepared from the refractory material of the waste tundish, so that the production cost can be reduced, and the pollution of waste to the environment can be reduced.
In an embodiment of the present invention, the slag-forming material has a chemical composition as described above, such that the slag-forming material can well improve the slag-forming effect. Specifically, calcium oxide and magnesium oxide contained in the slag-forming material can form a slag system with proper melting point and high viscosity with components in magnesia carbon bricks of a converter lining, and under the process condition of smelting by taking semisteel after vanadium extraction as a raw material, the slag-forming material generates a large amount of carbon dioxide gas and jet gas in the decomposition process, and the gases can stir and spray the slag system, so that slag is easily stuck on the converter wall, and the furnace lining is protected. In addition, the proportion of the alkaline compound and the acidic compound in the components can ensure the expected alkalinity required by converter slag formation.
In some embodiments, the particle size of the slag-forming material is 10-50 mm, and by controlling the particle size of the slag-forming material within this range, the slag-forming effect can be improved by further matching with corresponding process conditions.
According to another aspect of the present invention, there is provided a method for preparing a slag-forming material for converter blowing, wherein a converter blowing raw material includes a semisteel after vanadium extraction, the method comprising:
preparing (e.g., by crushing) the refractory material of the waste tundish into a particulate material as the slag-forming material, wherein the slag-forming material comprises, in mass percent: 73 to 74.5 percent of MgO and 7 to 8.5 percent ofCaO of (5.4-6.0 wt.%) and SiO of (5.4-6.0 wt.%) 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
In some embodiments, the method of making may further comprise separating the desired refractory material from the waste tundish. In some embodiments, the method of making may further comprise selecting a waste tundish having a chemical composition as described above, thereby ensuring that the slag forming material is made to have a chemical composition as described above.
According to another aspect of the present invention, there is provided a converter converting method, wherein a converter converting raw material includes a semisteel after vanadium extraction, the method comprising: during converter blowing, slag forming materials according to the above embodiments are added into the converter to perform slag forming.
The slag-forming material can be brought into a converter high-level bin through a converter feeding belt, and the slag-forming material is added into the converter in batches through the converter high-level bin in the converter steelmaking blowing process for slag-forming. The slag-forming material can replace partial high-magnesium lime slag formation in the converter steelmaking blowing process, forms a slag system with proper melting point and high viscosity with components in magnesia carbon bricks of a converter lining, and stirs and sprays the slag system through gas generated in the decomposition process, so that slag is stuck on the converter wall, and the converter lining is protected.
In some embodiments, in the converter blowing process, the slag-forming material, active lime and high-magnesium lime with the magnesium oxide content of 20-40 wt% are respectively added into the converter for slag-forming, wherein the mass and the dosage ratio of the slag-forming material, the active lime and the high-magnesium lime are as follows: 20 to 25 percent (3 to 5). By adopting the proportion, the auxiliary material cost can be reduced while the slagging effect is ensured.
Those of ordinary skill in the art will appreciate that: the above discussion of any embodiment is merely exemplary and is not intended to imply that the scope of the disclosure of embodiments of the invention, including the claims, is limited to such examples; combinations of features of the above embodiments or in different embodiments are also possible within the idea of an embodiment of the invention, and there are many other variations of the different aspects of the embodiments of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent substitutions, improvements, and the like, which are made within the spirit and principles of the embodiments of the invention, are included within the scope of the embodiments of the invention.
Claims (5)
1. The slag-forming material for converter blowing is characterized in that the converter blowing raw material comprises semisteel subjected to vanadium extraction, the slag-forming material is a granular material prepared from a refractory material of a waste tundish, and the slag-forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
2. Slag forming material according to claim 1, characterized in that the particle size of the slag forming material is 10-50 mm.
3. The preparation method of the slag-forming material for converter blowing is characterized in that the converter blowing raw material comprises semisteel after vanadium extraction, and the method comprises the following steps:
preparing the refractory material of the waste tundish into granular materials as the slag forming material, wherein the slag forming material comprises the following components in percentage by mass: 73-74.5% MgO, 7-8.5% CaO, 5.4-6.0% SiO 2 6.0 to 6.7 percent of Al 2 O 3 3.0 to 4.5 percent of Fe 2 O 3 0.08 to 1.00 percent of TiO 2 。
4. The converter converting method is characterized in that converter converting raw materials comprise semisteel subjected to vanadium extraction, and the method comprises the following steps:
during converter blowing, adding the slag-forming material according to claim 1 or 2 into a converter for slag formation.
5. The method according to claim 4, wherein the slag-forming material, the active lime and the high-magnesium lime with the magnesium oxide content of 20-40 wt% are respectively added into the converter for slag-forming in the converter blowing process, wherein the mass and the dosage ratio of the slag-forming material, the active lime and the high-magnesium lime are as follows: 20 to 25 percent (3 to 5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310192390.6A CN116356102A (en) | 2023-03-02 | 2023-03-02 | Slag-forming material for converter blowing, preparation method and converter blowing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310192390.6A CN116356102A (en) | 2023-03-02 | 2023-03-02 | Slag-forming material for converter blowing, preparation method and converter blowing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116356102A true CN116356102A (en) | 2023-06-30 |
Family
ID=86932014
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310192390.6A Pending CN116356102A (en) | 2023-03-02 | 2023-03-02 | Slag-forming material for converter blowing, preparation method and converter blowing method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116356102A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929961A (en) * | 2019-04-03 | 2019-06-25 | 西宁特殊钢股份有限公司 | A kind of purposes for the technique and magnesium ball preparing magnesium ball with tundish paint |
| CN113774183A (en) * | 2021-08-18 | 2021-12-10 | 河钢股份有限公司承德分公司 | Method for converter steelmaking slagging by using tundish refractory |
| CN115159961A (en) * | 2022-06-01 | 2022-10-11 | 玉溪新兴钢铁有限公司 | Method for recycling waste magnesium dry material for continuous casting tundish |
-
2023
- 2023-03-02 CN CN202310192390.6A patent/CN116356102A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109929961A (en) * | 2019-04-03 | 2019-06-25 | 西宁特殊钢股份有限公司 | A kind of purposes for the technique and magnesium ball preparing magnesium ball with tundish paint |
| CN113774183A (en) * | 2021-08-18 | 2021-12-10 | 河钢股份有限公司承德分公司 | Method for converter steelmaking slagging by using tundish refractory |
| CN115159961A (en) * | 2022-06-01 | 2022-10-11 | 玉溪新兴钢铁有限公司 | Method for recycling waste magnesium dry material for continuous casting tundish |
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