WO2022249797A1 - 溶鉄の脱りん方法 - Google Patents
溶鉄の脱りん方法 Download PDFInfo
- Publication number
- WO2022249797A1 WO2022249797A1 PCT/JP2022/018163 JP2022018163W WO2022249797A1 WO 2022249797 A1 WO2022249797 A1 WO 2022249797A1 JP 2022018163 W JP2022018163 W JP 2022018163W WO 2022249797 A1 WO2022249797 A1 WO 2022249797A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- molten iron
- slag
- iron
- dephosphorization
- molten metal
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 38
- 229910052751 metal Inorganic materials 0.000 title abstract description 24
- 239000002184 metal Substances 0.000 title abstract description 24
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 416
- 229910052742 iron Inorganic materials 0.000 claims abstract description 188
- 239000002893 slag Substances 0.000 claims abstract description 63
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 56
- 239000001301 oxygen Substances 0.000 claims abstract description 56
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 56
- 239000007789 gas Substances 0.000 claims abstract description 37
- 238000002844 melting Methods 0.000 claims abstract description 21
- 230000008018 melting Effects 0.000 claims abstract description 21
- 238000007664 blowing Methods 0.000 claims abstract description 17
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 10
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 10
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 9
- 239000000463 material Substances 0.000 claims abstract description 8
- 238000007667 floating Methods 0.000 claims abstract description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 21
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 238000010079 rubber tapping Methods 0.000 abstract description 17
- 238000000926 separation method Methods 0.000 abstract description 3
- 229910052698 phosphorus Inorganic materials 0.000 description 32
- 239000011574 phosphorus Substances 0.000 description 32
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 22
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 20
- 229910000831 Steel Inorganic materials 0.000 description 16
- 239000010959 steel Substances 0.000 description 16
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 14
- 229910001882 dioxygen Inorganic materials 0.000 description 14
- 239000000292 calcium oxide Substances 0.000 description 11
- 235000012255 calcium oxide Nutrition 0.000 description 11
- 238000006243 chemical reaction Methods 0.000 description 11
- 230000007547 defect Effects 0.000 description 10
- 238000009849 vacuum degassing Methods 0.000 description 10
- 241000209094 Oryza Species 0.000 description 8
- 235000007164 Oryza sativa Nutrition 0.000 description 8
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 8
- 230000003247 decreasing effect Effects 0.000 description 8
- 235000009566 rice Nutrition 0.000 description 8
- 239000000377 silicon dioxide Substances 0.000 description 8
- 239000004575 stone Substances 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 6
- 125000004435 hydrogen atom Chemical group [H]* 0.000 description 6
- 230000001603 reducing effect Effects 0.000 description 6
- 238000007670 refining Methods 0.000 description 6
- 229910052814 silicon oxide Inorganic materials 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 5
- 235000011941 Tilia x europaea Nutrition 0.000 description 5
- 239000004571 lime Substances 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 4
- 230000007423 decrease Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 4
- 239000001294 propane Substances 0.000 description 4
- 229910052786 argon Inorganic materials 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000004090 dissolution Methods 0.000 description 2
- 238000009847 ladle furnace Methods 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 229910000519 Ferrosilicon Inorganic materials 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000805 Pig iron Inorganic materials 0.000 description 1
- 239000002253 acid Substances 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
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 235000011116 calcium hydroxide Nutrition 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010792 warming 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or 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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
- C21C1/025—Agents used for dephosphorising or 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/527—Charging of the electric furnace
-
- 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
- C21C5/52—Manufacture of steel in electric furnaces
- C21C5/54—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
- 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
-
- 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
-
- 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
- C21C7/10—Handling in a vacuum
-
- 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
- C21C2300/00—Process aspects
- C21C2300/08—Particular sequence of the process steps
-
- 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
Definitions
- the present invention relates to a method for dephosphorizing molten iron for producing steel products with a low phosphorus concentration, and more particularly to a method for dephosphorizing molten iron obtained by melting a cold iron source.
- the dephosphorization reaction is thermodynamically more advantageous at lower temperatures, so so-called hot metal dephosphorization is widely used.
- the mainstream method is to melt the cold iron source in an electric furnace such as an arc furnace to produce low-carbon molten iron without using molten pig iron.
- a general refining process of molten iron in an electric furnace is a method as described in Patent Document 1, for example.
- Patent Document 1 After charging raw materials including a cold iron source, electric energy is supplied to melt the cold iron source to obtain low-carbon molten iron, and the molten iron is deoxidized and oxygen source. This is a method of reducing the phosphorus concentration while reducing the carbon concentration in molten iron by supplying phosphorus flux.
- reduced iron includes gangue components such as silicon oxide and aluminum oxide contained in iron ore, which is a raw material, and generates a large amount of slag during melting. Therefore, it is necessary to consider this point in the method of dephosphorizing molten iron.
- Patent Document 2 As a method for dephosphorizing molten iron at the stage of molten steel, for example, methods described in Patent Document 2 and Patent Document 3 are also disclosed.
- a gas mainly composed of oxygen gas is applied to the surface of molten iron in a reaction vessel having a temperature of 1550 ° C. or higher and a carbon content of 0.5% by mass or less from a top blowing lance.
- a lime source containing limestone or slaked lime as a main component is projected onto the collision surface of the jet against the molten iron surface to decarburize and dephosphorize the molten iron.
- molten steel is tapped from a converter into a ladle in a state where the oxygen concentration of the molten steel is 200 mass ppm or more, and a dephosphorizing agent is added at the time of tapping to convert CaO/SiO on a mass basis.
- a slag having a 2 ratio of 2.5 or more and a total Fe content of 15% by mass or more is obtained, and the molten steel is stirred by introducing a gas into the molten steel during and after tapping.
- Patent Document 2 aims at improving the dephosphorization efficiency in the final stage of decarburization refining of molten iron and molten iron in which iron scrap is melted, and excessive oxygen blowing among the problems of Patent Document 1 has been alleviated.
- the influence of gangue derived from reduced iron was not taken into consideration, and there were cases where the present invention could not be applied to the target iron source environment (slag amount).
- the molten iron targeted by Patent Document 2 has a low phosphorus concentration of 0.04% by mass or less before dephosphorization treatment, and it is impossible to process molten iron with a phosphorus concentration comparable to that of blast furnace molten iron (0.10% by mass or more). It is not assumed.
- Patent Document 3 lacked dephosphorization ability. Moreover, although Patent Document 3 does not describe the phosphorus concentration before dephosphorization treatment, it is considered that the treatment of molten iron with a phosphorus concentration comparable to that of blast furnace molten iron (0.10% by mass or more) is not assumed.
- the present invention has been made in view of such circumstances, and its object is to dephosphorize molten iron without dissolving excessive oxygen in molten iron and reducing the phosphorus concentration and slag.
- another object of the present invention is to propose a method for dephosphorizing molten iron that is suitable even when reduced iron produced using a carbon-reduced reducing agent is blended.
- a first method for dephosphorizing molten iron according to the present invention comprises blowing hydrogen gas, hydrocarbon gas, or a mixed gas thereof into molten iron held in a container, and supplying a source to dephosphorize the molten iron to obtain dephosphorized molten iron, and separating slag floating on the surface of the dephosphorized molten iron after the dephosphorization treatment from the dephosphorized molten iron.
- the first molten iron dephosphorization method includes: (a) after separating the slag, deoxidizing the molten iron after dephosphorization with a deoxidizing agent; (b) the molten iron has a carbon content of 0.5% by mass or less before the dephosphorization treatment; (c) the molten iron is obtained by melting a cold iron source; (d) the cold iron source comprises reduced iron; (e) said vessel is a ladle; etc. is considered to be a more preferable solution.
- a cold iron source is melted in a melting furnace, and the molten iron is and separating the generated slag from the molten iron before pouring the molten iron from the melting furnace into the container, and separating the slag that has flowed into the container together with the molten iron from the molten iron; It is considered that performing either one or both of them can be a more preferable solution.
- hydrogen or hydrocarbon gas or a mixed gas thereof is supplied to molten iron, and a slag-forming material and an oxygen source are supplied to perform dephosphorization treatment.
- Deoxidation reaction of the dissolved oxygen occurs, and it is possible to suppress the excessive oxygen dissolved in the molten iron.
- the supplied gas containing hydrogen atoms and the water vapor gas generated by the deoxidation reaction promote stirring of the molten iron, so that low-phosphorus steel can be stably produced. Therefore, even if a large amount of reduced iron with a low carbon concentration is used and the phosphorus concentration in the molten iron increases or the amount of slag increases, it is possible to stably reduce the phosphorus by removing the slag after dissolution. Steel can be manufactured.
- the inventors conceived the present invention as follows.
- the dephosphorization reaction which is an oxidation reaction
- iron oxide is generated in the oxygen source supply portion on the upper surface of the molten iron, and forms molten slag together with the slag-forming material.
- the iron oxide in the slag is partially decomposed, and the oxygen generated thereby dissolves in the molten iron.
- part of the supplied oxygen source dissolves oxygen in the molten iron, and the dissolved oxygen concentration rises.
- the dissolved oxygen in the vicinity of the slag-metal interface is maintained at a high level, and the dephosphorization reaction proceeds.
- the dissolved oxygen supplied from the oxygen source and the molten slag reacts with the carbon in the molten iron, so that the dissolved oxygen does not excessively rise.
- the carbon concentration in molten iron is low, dissolved oxygen will continue to rise.
- the dissolved oxygen concentration in the molten iron before dephosphorization is approximately 100 ppm by mass or more.
- the dephosphorization treatment is performed from this state, the dissolved oxygen concentration in the molten iron further increases to a state exceeding 1000 ppm by mass.
- the amount of deoxidizing aluminum added after slag removal following the dephosphorization treatment increases, and the Fe yield deteriorates due to an increase in oxidation loss of Fe.
- deoxidizing elements such as aluminum and silicon are added during the dephosphorization treatment.
- silicon oxide and aluminum oxide which are deoxidation products, increase the slag volume, which is not preferable.
- the inventors have found that by supplying hydrogen gas, hydrocarbon gas, or a mixed gas thereof during the dephosphorization treatment, the dissolved oxygen in the molten iron is deoxidized by the gaseous deoxidizing agent. I thought it would prevent an excessive rise. In addition, since there is no change in the slag composition, it is possible to suppress excessive increases in the slag volume and the amount of lime required.
- the dephosphorization treatment in the melting process, that is, in the melting furnace.
- the slag is sludged before tapping from the melting furnace, or the slag is removed after tapping, or the slag is cast before tapping from the melting furnace, the slag is removed after tapping, and then dephosphorization is performed in a ladle or the like. , it was thought that the increase in slag volume due to the effect of gangue contained in reduced iron could be suppressed.
- the iron source is melted and heated using electrical energy in a steelmaking melting furnace.
- a steelmaking melting furnace for steelmaking, an electric furnace such as an arc furnace or an induction furnace can be used.
- the iron source may be not only a solid iron source (cold iron source) such as scrap or reduced iron, but also molten iron melted in another process.
- the thermal energy supplied for melting the solid iron source and heating the iron source may be not only electric energy, but also combustion heat of metal or the like may be used as a complement. These energies are preferably renewable energies from the viewpoint of reducing CO 2 emissions.
- the furnace body may be tilted before pouring out the molten iron from the electric furnace to pour out the slag.
- the furnace body may be tilted before the hot water is discharged from the electric furnace to discharge hot water after the slag, and the slag flowing out together with the molten iron into a container such as a ladle may be further removed.
- a slag-forming material containing lime as a main component is added from an automatic feeding hopper or the like onto the molten iron in the ladle.
- the input amount of the slag-forming material is preferably adjusted so that the slag basicity defined by the mass-based (calcium oxide concentration)/(silicon oxide concentration) ratio is about 2.0.
- oxygen gas is supplied from a top-blowing lance as an oxygen source.
- the oxygen gas flow rate per unit mass of molten iron is preferably about 0.05 to 0.15 Nm 3 /(t ⁇ min).
- Nm 3 means the volume of gas under standard conditions. In this specification, the standard gas state is 0° C. and 1 atm (101325 Pa).
- the behavior of spitting differs depending on the freeboard height of the ladle and the shape of the nozzle of the top blowing lance, it is preferable to finely adjust the acid feed rate and the lance height.
- oxygen gas When oxygen gas is supplied, the temperature of the molten iron rises due to the heat of oxidation reaction, so there is no problem even if a solid oxygen source such as iron oxide is added to adjust the temperature of the molten iron.
- a solid oxygen source such as iron oxide
- an oxygen-containing gas obtained by diluting oxygen gas with an inert gas may be used as the oxygen source.
- a gas containing hydrogen atoms consisting of hydrogen gas, hydrocarbon gas, or a mixed gas thereof is supplied into the molten iron.
- This gas containing hydrogen atoms may be supplied from an injection lance, or may be supplied by installing a porous plug or the like at the bottom of the ladle.
- a gas containing hydrogen atoms causes a deoxidation reaction of dissolved oxygen in the molten iron, thereby suppressing excessive dissolved oxygen in the molten iron.
- bubbles are generated from the supplied gas containing hydrogen atoms and the water vapor gas generated by the deoxidation reaction. The buoyancy of the bubbles also has the effect of promoting stirring of the molten iron.
- a total flow rate of about 3 to 10 vol% of the oxygen flow rate supplied from the top blowing lance is an appropriate range for the amount of hydrogen gas and hydrocarbon gas supplied. rice field. If the supply amount is smaller than that, the deoxidizing effect may be low and the dissolved oxygen reducing effect may be small. On the other hand, if the supply amount is excessive, the dissolved oxygen in the molten iron may be too low, resulting in a decrease in the dephosphorization ability.
- the slag floating on the surface of the molten iron after dephosphorization is separated from the molten iron after dephosphorization.
- a container such as a ladle containing the dephosphorized molten iron is tilted, and slag removal is performed by scraping off slag floating on the surface of the dephosphorized molten iron with a slag dragger or the like.
- the dephosphorized portion of the phosphorus contained in the molten iron before the dephosphorization treatment is transferred to the slag.
- an operation of deoxidizing the molten iron after dephosphorization with a deoxidizing agent is performed.
- This deoxidation is performed within a period from the separation of the slag from the molten iron after dephosphorization to the casting of the molten iron.
- deoxidizing may be performed by adding a deoxidizing agent to the ladle containing the molten iron immediately after the slag removal, or after the slag removal, the ladle containing the molten iron is transported to the refining equipment for the next process.
- deoxidation may be performed by adding a deoxidizing agent during the refining treatment in the next step.
- deoxidizing may be performed by adding a deoxidizing agent during the vacuum degassing treatment.
- the timing of adding the deoxidizing agent during the vacuum degassing process is not particularly limited.
- a so-called killed treatment may be performed in which a deoxidizing agent is added at the beginning of the vacuum degassing treatment to deoxidize the molten iron, and then the molten iron is refluxed after deoxidizing.
- the molten iron is circulated without adding a deoxidizing agent, and during this period, decarburization is performed by sending oxygen as necessary.
- Killing treatment may be performed by adding a deoxidizing agent.
- the next step is not limited to the treatment in the RH type vacuum degassing equipment, but may be the treatment in the VOD equipment or the treatment in the ladle furnace (LF).
- the addition timing of the deoxidizing agent during treatment in these facilities is not particularly limited, as in the vacuum degassing treatment in the RH vacuum degassing facility described above.
- commonly used deoxidizing agents such as metallic aluminum, metallic silicon, ferrosilicon, and silicon manganese can be used.
- the scrap or reduced iron was charged into a 150t scale electric furnace and melted, and the slag was removed after the hot water was poured into the ladle.
- the reduced iron used in the test was produced by reduction with hydrogen, and the carbon concentration was analyzed to be 0.15% by mass.
- a slag-forming material is added to the molten iron in the ladle after tapping, oxygen gas is supplied from the top-blowing lance, and argon gas, hydrogen gas, hydrocarbon gas, or a mixed gas of hydrogen gas and hydrocarbon gas is supplied from the bottom of the ladle.
- Dephosphorization treatment was performed. After the dephosphorization treatment was completed, the slag on the surface of the hot ladle was removed, followed by vacuum degassing treatment with an RH reflux apparatus, adding an Al-containing substance for deoxidation, and adjusting other components. .
- Test 1 As a source of cold iron, 150 tons of scrap was melted in an electric furnace, poured into a ladle, and then slag was removed.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.25% by mass
- the P concentration [P] i was 0.040% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 125 mass ppm. rice field.
- oxygen gas was supplied at 20 Nm 3 /min from a top blowing lance, and argon gas was supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle to dephosphorize for 10 minutes. processed.
- the phosphorus concentration in the molten iron after the dephosphorization treatment decreased to 0.004% by mass, but the dissolved oxygen concentration [O] f was 1530 mass ppm. For this reason, the input amount of Al for deoxidization and quality defects became high. Moreover, the Fe yield became low.
- Test 2 As a source of cold iron, 150 tons of scrap was melted in an electric furnace, poured into a ladle, and then slag was removed.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.23% by mass
- the P concentration [P] i was 0.035% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 140 mass ppm. rice field.
- oxygen gas is supplied at 20 Nm 3 /min from a top blowing lance
- hydrogen gas is supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle, and dephosphorization is performed for 10 minutes. processed.
- the phosphorus concentration in the molten iron after dephosphorization treatment decreased to 0.005% by mass.
- the dissolved oxygen concentration [O] f was 630 ppm by mass, and the input amount of deoxidizing Al and quality defects were low. Also, the Fe yield became high.
- Test 3 As a source of cold iron, 150 tons of scrap was melted in an electric furnace, poured into a ladle, and then slag was removed.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.25% by mass
- the P concentration [P] i was 0.038% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 123 mass ppm. rice field.
- oxygen gas was supplied at 20 Nm 3 /min from a top blowing lance
- propane gas was supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle, and dephosphorization was performed for 10 minutes.
- the phosphorus concentration in the molten iron after dephosphorization treatment decreased to 0.005% by mass.
- the dissolved oxygen concentration [O] f was 560 ppm by mass, and the input amount of deoxidizing Al and quality defects were low. Also, the Fe yield became high.
- Test 4 As a source of cold iron, 150 tons of scrap was melted in an electric furnace, poured into a ladle, and then slag was removed.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.24% by mass
- the P concentration [P] i was 0.036% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 132 mass ppm. rice field.
- oxygen gas is supplied at 20Nm 3 /min from a top blowing lance
- 50vol% hydrogen-50vol% propane gas is supplied at 1Nm 3 /min from a porous plug installed at the bottom of the ladle.
- the phosphorus concentration in the molten iron after the dephosphorization treatment decreased to 0.004% by mass.
- the dissolved oxygen concentration [O] f was 590 ppm by mass, and the input amount of deoxidizing Al and quality defects were low. Also, the Fe yield became high.
- Test 5 150 tons of reduced iron was melted in an electric furnace as a source of cold iron, and slag was removed after pouring into a ladle.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.20% by mass
- the P concentration [P] i was 0.140% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 136 mass ppm. rice field.
- oxygen gas was supplied at 20 Nm 3 /min from a top blowing lance
- argon gas was supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle to dephosphorize for 10 minutes.
- the phosphorus concentration in the molten iron after the dephosphorization treatment decreased to 0.003% by mass, but the dissolved oxygen concentration [O] f was 1720 mass ppm. For this reason, the input amount of Al for deoxidization and quality defects became high. Moreover, the Fe yield became low.
- Test 6 150 tons of reduced iron was melted in an electric furnace as a source of cold iron, and slag was removed after pouring into a ladle.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.19% by mass
- the P concentration [P] i was 0.130% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 160 mass ppm. rice field.
- oxygen gas was supplied at 20 Nm 3 /min from a top blowing lance
- hydrogen gas was supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle, and dephosphorization was performed for 10 minutes. processed.
- the phosphorus concentration in the molten iron after dephosphorization treatment decreased to 0.005% by mass.
- the dissolved oxygen concentration [O] f was 510 ppm by mass, and the input amount of deoxidizing Al and quality defects were low. Also, the Fe yield became high.
- Test 7 150 tons of reduced iron was melted in an electric furnace as a source of cold iron, and slag was removed after pouring into a ladle.
- the C concentration [C] i of the molten iron after tapping into the ladle was 0.23% by mass
- the P concentration [P] i was 0.126% by mass
- the dissolved oxygen concentration [O] i in the molten iron was 140 mass ppm. rice field.
- oxygen gas was supplied at 20 Nm 3 /min from a top blowing lance
- propane gas was supplied at 1 Nm 3 /min from a porous plug installed at the bottom of the ladle, and dephosphorization was performed for 10 minutes. processed.
- the phosphorus concentration in the molten iron after dephosphorization treatment decreased to 0.005% by mass.
- the dissolved oxygen concentration [O] f was 600 ppm by mass, and the input amount of deoxidizing Al and quality defects were low. Also, the Fe yield became high.
- the phosphorus concentration in the molten iron after the dephosphorization treatment decreased to 0.005% by mass, but the dissolved oxygen concentration [O] f was 530 mass ppm.
- the input amount of Al for deoxidization and quality defects were low. Also, the Fe yield became high.
- the method for dephosphorizing molten iron according to the present invention it is possible to stably produce low-phosphorus steel without dissolving excess oxygen and even when the phosphorus concentration and the amount of slag are increased . Since it is possible to stably produce low-phosphorus steel even when reduced iron produced using a reducing agent with reduced emissions is blended, it contributes to the reduction of CO2 and is industrially useful.
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
Description
今後、前述のように炭素を低減した還元剤を用いて製造された還元鉄の使用比率が増加すると、溶解後の溶鉄中の炭素濃度が低位となる。その結果、特許文献1の方法では、脱りん処理を行うために酸素源を供給すると溶鋼中に溶存する酸素の濃度が著しく上昇し、脱酸用の金属アルミニウム使用量が増加する。そのため、製造コストが増加する問題と、脱酸生成物であるアルミナ系介在物の生成量が増加することで品質上の問題が生じる。また、還元鉄の使用量が増加するにつれて、溶解後のりん濃度が増加するため、脱りん能を強化する必要がある。そのためには質量比の(酸化カルシウム濃度)/(酸化珪素濃度)で定義されるスラグの塩基度を上げる必要がある。しかしながら、還元鉄の使用量が増加すると同時に酸化珪素や酸化アルミニウムの発生量も増加するため、脱りん能力を確保するために必要な石灰添加量が莫大となる。
(a)前記スラグを分離した後、前記脱りん後溶鉄を脱酸剤で脱酸すること、
(b)前記溶鉄は、前記脱りん処理前の炭素含有量が0.5質量%以下であること、
(c)前記溶鉄は冷鉄源を溶解して得たものであること、
(d)前記冷鉄源が還元鉄を含むこと、
(e)前記容器が取鍋であること、
などが、より好ましい解決手段になり得るものと考えられる。
酸化反応である脱りん反応を促進するためには、反応領域であるスラグ-メタル界面近傍の溶存酸素を高位に維持する必要がある。そのためには、溶鉄中の溶存酸素濃度を500質量ppm程度まで上げれば十分である。そして、溶鉄に造滓材および酸素源を供給すると、溶鉄上面の酸素源供給部分に酸化鉄が生成し、造滓材とともに溶融スラグを形成する。スラグ中の酸化鉄は一部分解し、それによって発生した酸素は溶鉄中に溶存する。また供給した酸素源の一部は溶鉄中に酸素を溶存させ、溶存酸素濃度は上昇する。その結果、スラグ-メタル界面近傍の溶存酸素は高位に維持され、脱りん反応が進行する。溶鉄中に炭素が存在していれば、上記酸素源および溶融スラグから供給された溶存酸素は、溶鉄中炭素と反応するため、溶存酸素の過剰な上昇は起こらない。しかしながら、溶鉄中の炭素濃度が低い場合は溶存酸素が上昇し続けることになる。
第一工程として、製鋼用溶解炉において、電気エネルギーを用いて、鉄源の溶解および昇熱を行う。ここで、製鋼用溶解炉としては、アーク炉や誘導炉のような電気炉を用いることができる。この際、鉄源とはスクラップや還元鉄のような固体鉄源(冷鉄源)だけでなく、別プロセスで溶解した溶鉄を利用してもよい。また、固体鉄源の溶解および、鉄源の昇熱のために供給する熱エネルギーは電気エネルギーだけではなく、補填的に金属の燃焼熱等を使用してもよい。これらのエネルギーは、再生可能エネルギーであることがCO2排出量削減の観点から好ましい。
冷鉄源としてスクラップ150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.25質量%、P濃度[P]iは0.040質量%、溶鉄中の溶存酸素濃度[O]iは125質量ppmであった。生石灰2tおよび珪石1tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、アルゴンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.004質量%まで低下したが、溶存酸素濃度[O]fは1530質量ppmとなった。このため、脱酸用Alの投入量および品質欠陥が高位となった。またFe歩留まりが低位となった。
冷鉄源としてスクラップ150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.23質量%、P濃度[P]iは0.035質量%、溶鉄中の溶存酸素濃度[O]iは140質量ppmであった。生石灰2tおよび珪石1tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、水素ガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.005質量%まで低下した。この時、溶存酸素濃度[O]fは630質量ppmとなり、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
冷鉄源としてスクラップ150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.25質量%、P濃度[P]iは0.038質量%、溶鉄中の溶存酸素濃度[O]iは123質量ppmであった。生石灰2tおよび珪石1tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、プロパンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.005質量%まで低下した。この時、溶存酸素濃度[O]fは560質量ppmとなり、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
冷鉄源としてスクラップ150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.24質量%、P濃度[P]iは0.036質量%、溶鉄中の溶存酸素濃度[O]iは132質量ppmであった。生石灰2tおよび珪石1tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、50vol%水素-50vol%プロパンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.004質量%まで低下した。この時、溶存酸素濃度[O]fは590質量ppmとなり、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
冷鉄源として還元鉄150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.20質量%、P濃度[P]iは0.140質量%、溶鉄中の溶存酸素濃度[O]iは136質量ppmであった。生石灰6tおよび珪石3tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、アルゴンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.003質量%まで低下したが、溶存酸素濃度[O]fは1720質量ppmとなった。このため、脱酸用Alの投入量および品質欠陥が高位となった。またFe歩留まりが低位となった。
冷鉄源として還元鉄150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.19質量%、P濃度[P]iは0.130質量%、溶鉄中の溶存酸素濃度[O]iは160質量ppmであった。生石灰6tおよび珪石3tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、水素ガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.005質量%まで低下した。この時、溶存酸素濃度[O]fは510質量ppmとなり、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
冷鉄源として還元鉄150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。取鍋に出湯後の溶鉄のC濃度[C]iは0.23質量%、P濃度[P]iは0.126質量%、溶鉄中の溶存酸素濃度[O]iは140質量ppmであった。生石灰6tおよび珪石3tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、プロパンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.005質量%まで低下した。この時、溶存酸素濃度[O]fは600質量ppmとなり、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
冷鉄源として還元鉄150tを電気炉にて溶解し、取鍋に出湯後除滓を行った。出湯後の溶鉄のC濃度[C]iは0.21質量%、P濃度[P]iは0.132質量%、溶鉄中の溶存酸素濃度[O]iは150質量ppmであった。生石灰6tおよび珪石3tを添加したのち、上吹きランスより酸素ガスを20Nm3/minで供給し、取鍋の底部に設置したポーラスプラグより、50vol%水素ガス-50vol%プロパンガス1Nm3/minを供給し、10分間脱りん処理を行った。その結果、脱りん処理後の溶鉄中のりん濃度は0.005質量%まで低下したが、溶存酸素濃度[O]fは530質量ppmとなった。このため、脱酸用Alの投入量および品質欠陥は低位となった。また、Fe歩留まりは高位となった。
Claims (7)
- 容器に保持された溶鉄に、水素ガスもしくは炭化水素ガスまたはそれらの混合ガスを吹込みつつ、造滓材と酸素源を供給して前記溶鉄の脱りん処理を行い脱りん後溶鉄を得、該脱りん処理後に前記脱りん後溶鉄の表面に浮遊するスラグを該脱りん後溶鉄から分離することを含む、溶鉄の脱りん方法。
- 前記スラグを分離した後、前記脱りん後溶鉄を脱酸剤で脱酸する、請求項1に記載の溶鉄の脱りん方法。
- 前記溶鉄は、前記脱りん処理前の炭素含有量が0.5質量%以下である、請求項1または2に記載の溶鉄の脱りん方法。
- 前記溶鉄は冷鉄源を溶解して得たものである、請求項1ないし3のいずれか1項に記載の溶鉄の脱りん方法。
- 前記冷鉄源が還元鉄を含む、請求項4に記載の溶鉄の脱りん方法。
- 前記容器が取鍋である、請求項1ないし5のいずれか1項に記載の溶鉄の脱りん方法。
- 前記脱りん処理の前に、冷鉄源を溶解炉で溶解して溶鉄を得、該溶鉄を前記溶解炉より前記容器に出湯するにあたり、生成したスラグを出湯前に前記溶鉄から分離すること、および、前記容器に前記溶鉄と共に流入したスラグを該溶鉄から分離すること、のいずれか一方または両方を行う、請求項1~6のいずれか1項に記載の溶鉄の脱りん方法。
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP22811071.4A EP4324940A1 (en) | 2021-05-26 | 2022-04-19 | Method for dephosphorization of molten metal |
BR112023024387A BR112023024387A2 (pt) | 2021-05-26 | 2022-04-19 | Método para desfosforação de ferro fundido |
KR1020237043468A KR20240010004A (ko) | 2021-05-26 | 2022-04-19 | 용철의 탈인 방법 |
CN202280036684.3A CN117396614A (zh) | 2021-05-26 | 2022-04-19 | 铁液的脱磷方法 |
JP2022547077A JP7302749B2 (ja) | 2021-05-26 | 2022-04-19 | 溶鉄の脱りん方法 |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021088400 | 2021-05-26 | ||
JP2021-088400 | 2021-05-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022249797A1 true WO2022249797A1 (ja) | 2022-12-01 |
Family
ID=84229949
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/018163 WO2022249797A1 (ja) | 2021-05-26 | 2022-04-19 | 溶鉄の脱りん方法 |
Country Status (7)
Country | Link |
---|---|
EP (1) | EP4324940A1 (ja) |
JP (1) | JP7302749B2 (ja) |
KR (1) | KR20240010004A (ja) |
CN (1) | CN117396614A (ja) |
BR (1) | BR112023024387A2 (ja) |
TW (1) | TWI823400B (ja) |
WO (1) | WO2022249797A1 (ja) |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56216A (en) * | 1979-06-16 | 1981-01-06 | Chobe Taguchi | Dephosphoration of iron steel |
JPS5980711A (ja) * | 1982-09-23 | 1984-05-10 | ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン | 鉄から燐を除去する方法 |
JPS61291913A (ja) | 1985-06-20 | 1986-12-22 | Nippon Kokan Kk <Nkk> | 溶鋼の脱燐方法 |
JPH08225880A (ja) | 1995-01-16 | 1996-09-03 | Kct Technol Gmbh | 合金鋼の製造方法および合金鋼の製造プラント |
JP2001107125A (ja) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | 精錬時のスラグフォーミングの抑制方法 |
JP2005089839A (ja) | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | 溶鋼の溶製方法 |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN108950131B (zh) * | 2018-07-10 | 2020-04-28 | 娄永琰 | 一种h13模具钢的冶炼及还原脱磷方法 |
CN111748673B (zh) * | 2020-06-02 | 2021-06-11 | 北京科技大学 | 一种电弧炉炼钢用多功能氢氧烧嘴及供能控制方法 |
-
2022
- 2022-04-19 EP EP22811071.4A patent/EP4324940A1/en active Pending
- 2022-04-19 JP JP2022547077A patent/JP7302749B2/ja active Active
- 2022-04-19 KR KR1020237043468A patent/KR20240010004A/ko unknown
- 2022-04-19 BR BR112023024387A patent/BR112023024387A2/pt unknown
- 2022-04-19 WO PCT/JP2022/018163 patent/WO2022249797A1/ja active Application Filing
- 2022-04-19 CN CN202280036684.3A patent/CN117396614A/zh active Pending
- 2022-05-23 TW TW111119070A patent/TWI823400B/zh active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56216A (en) * | 1979-06-16 | 1981-01-06 | Chobe Taguchi | Dephosphoration of iron steel |
JPS5980711A (ja) * | 1982-09-23 | 1984-05-10 | ナシヨナル・リサ−チ・デイベロツプメント・コ−ポレイシヨン | 鉄から燐を除去する方法 |
JPS61291913A (ja) | 1985-06-20 | 1986-12-22 | Nippon Kokan Kk <Nkk> | 溶鋼の脱燐方法 |
JPH08225880A (ja) | 1995-01-16 | 1996-09-03 | Kct Technol Gmbh | 合金鋼の製造方法および合金鋼の製造プラント |
JP2001107125A (ja) * | 1999-09-30 | 2001-04-17 | Sumitomo Metal Ind Ltd | 精錬時のスラグフォーミングの抑制方法 |
JP2005089839A (ja) | 2003-09-18 | 2005-04-07 | Jfe Steel Kk | 溶鋼の溶製方法 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2022249797A1 (ja) | 2022-12-01 |
EP4324940A1 (en) | 2024-02-21 |
BR112023024387A2 (pt) | 2024-02-15 |
TWI823400B (zh) | 2023-11-21 |
KR20240010004A (ko) | 2024-01-23 |
CN117396614A (zh) | 2024-01-12 |
JP7302749B2 (ja) | 2023-07-04 |
TW202246531A (zh) | 2022-12-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP5343308B2 (ja) | 溶鋼の脱硫方法 | |
JP2013234379A (ja) | 極低燐極低硫鋼の溶製方法 | |
JP2007224367A (ja) | 高窒素含有鋼の溶製方法 | |
WO1995001458A1 (fr) | Procede de production et d'acier au moyen d'un convertisseur | |
JP6693536B2 (ja) | 転炉製鋼方法 | |
JP2006233264A (ja) | 高クロム溶鋼の溶製方法 | |
JP2007051350A (ja) | 低硫鋼の溶製方法 | |
JP6028755B2 (ja) | 低硫鋼の溶製方法 | |
JP2016151027A (ja) | 溶鋼の製造方法 | |
JPH09217110A (ja) | 超低硫鋼の溶製方法 | |
TWI685577B (zh) | 高錳鋼的冶煉方法 | |
JP2008063610A (ja) | 溶鋼の製造方法 | |
JP7302749B2 (ja) | 溶鉄の脱りん方法 | |
JP2008169407A (ja) | 溶鋼の脱硫方法 | |
JPH09235611A (ja) | 清浄性の高い極低硫純鉄の製造方法 | |
JP7384294B2 (ja) | 溶鉄の精錬方法 | |
JP2016079462A (ja) | 溶銑の精錬方法 | |
JPH0987732A (ja) | 溶鋼の精錬方法 | |
JP2002129221A (ja) | 溶銑の精錬方法 | |
JP4192503B2 (ja) | 溶鋼の製造方法 | |
JP2006241561A (ja) | 溶銑輸送容器からの発塵防止方法 | |
US20240229177A1 (en) | Method for dephosphorization of molten iron | |
JP7167704B2 (ja) | 溶銑脱硫方法 | |
JP7248195B2 (ja) | 転炉製鋼方法 | |
WO2022259808A1 (ja) | 溶鋼の脱窒方法、脱窒及び脱硫同時処理方法および鋼の製造方法 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref document number: 2022547077 Country of ref document: JP Kind code of ref document: A |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22811071 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022811071 Country of ref document: EP |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280036684.3 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 18563597 Country of ref document: US |
|
ENP | Entry into the national phase |
Ref document number: 2022811071 Country of ref document: EP Effective date: 20231116 |
|
REG | Reference to national code |
Ref country code: BR Ref legal event code: B01A Ref document number: 112023024387 Country of ref document: BR |
|
ENP | Entry into the national phase |
Ref document number: 20237043468 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 1020237043468 Country of ref document: KR |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2023135001 Country of ref document: RU |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
ENP | Entry into the national phase |
Ref document number: 112023024387 Country of ref document: BR Kind code of ref document: A2 Effective date: 20231122 |