WO2021172254A1 - 焼結鉱の製造方法 - Google Patents
焼結鉱の製造方法 Download PDFInfo
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- WO2021172254A1 WO2021172254A1 PCT/JP2021/006552 JP2021006552W WO2021172254A1 WO 2021172254 A1 WO2021172254 A1 WO 2021172254A1 JP 2021006552 W JP2021006552 W JP 2021006552W WO 2021172254 A1 WO2021172254 A1 WO 2021172254A1
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- WIPO (PCT)
- Prior art keywords
- raw material
- charging layer
- oxygen
- sinter
- material charging
- Prior art date
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 19
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 113
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 113
- 239000001301 oxygen Substances 0.000 claims abstract description 113
- 239000002994 raw material Substances 0.000 claims abstract description 93
- 238000000034 method Methods 0.000 claims abstract description 44
- 238000005245 sintering Methods 0.000 claims abstract description 40
- 239000003575 carbonaceous material Substances 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 9
- 230000029142 excretion Effects 0.000 claims description 5
- 238000010304 firing Methods 0.000 abstract description 12
- 239000000446 fuel Substances 0.000 abstract description 8
- 238000012360 testing method Methods 0.000 description 15
- 238000002485 combustion reaction Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000000047 product Substances 0.000 description 10
- 239000000843 powder Substances 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007664 blowing Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 230000001737 promoting effect Effects 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000033558 biomineral tissue development Effects 0.000 description 1
- 238000001354 calcination Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000013021 overheating Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/18—Sintering; Agglomerating in sinter pots
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
- C22B1/205—Sintering; Agglomerating in sintering machines with movable grates regulation of the sintering process
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
- C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
- C21B13/002—Reduction of iron ores by passing through a heated column of carbon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/004—Making spongy iron or liquid steel, by direct processes in a continuous way by reduction from ores
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0046—Making spongy iron or liquid steel, by direct processes making metallised agglomerates or iron oxide
- C21B13/0053—On a massing grate
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/0086—Conditioning, transformation of reduced iron ores
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
Definitions
- the present invention relates to a method for producing sinter by an oxygen enrichment operation in a downward suction type Dwightroid (DL) sinter.
- the blast furnace uses an iron source such as lump ore or sinter, charges the raw material containing the iron source from the upper part of the furnace, and blows reducing gas from the lower part of the furnace to melt and reduce the iron source. It is a facility that manufactures molten iron. In general, it is necessary to allow the reducing gas to flow sufficiently in the furnace of the blast furnace in order to promote the reaction between the reducing gas and the iron source. For that purpose, it is effective to increase the air permeability in the blast furnace, and as a result, it becomes possible to improve the production rate of hot metal and reduce the cost.
- an iron source such as lump ore or sinter
- Patent Document 1 proposes a technique for promoting combustion and improving the yield by blowing oxygen toward the raw material charging layer on the pallet of the DL sintering machine.
- the technique disclosed in this document is a method of enriching oxygen in the upper layer of the raw material charging layer on the pallet for the purpose of improving productivity, improving the yield, or reducing the powder generation rate at the time of crushing the sintered cake. ..
- the position of oxygen enrichment in this known technique is limited to the ignition position to the raw material charging layer, and it is stated that the oxygen enrichment after that is ineffective, and the raw material is clear.
- Patent Document 2 proposes a method of producing sinter by supplying gaseous fuel to the raw material charging layer on the pallet of the DL sinter. According to this method, the combustion region (combustion zone) in the raw material charging layer during sintering is widened, heat is supplemented to a portion having low strength during manufacturing, and the product strength can be improved.
- Patent Document 3 proposes a method of producing a high-strength sinter by creating a temperature condition suitable for sintering in a raw material charging layer by simultaneously blowing a gaseous fuel together with oxygen during sintering. doing.
- the above-mentioned conventional technique is intended to supplement the combustion melting reaction (sintering reaction) of the upper layer portion of the raw material charging layer having less heat input, and oxygen is applied to the upper layer portion only immediately after ignition. It is a way to enrich.
- this method reduces the powder generation rate during crushing of the sintered cake, it is remarkable in reducing the strength of the entire product sintered ore after crushing, that is, reducing the powder generated during transportation and storage into the blast furnace. has no effect.
- Patent Documents 2, 3 and 4 it is essential to use them in combination with gaseous fuel, and there is a problem in terms of cost. Further, these methods have a problem that as a result of expanding the combustion region and the melt generation region during combustion, the air permeability is lowered and the productivity is lowered.
- Patent Document 5 proposes a method of enriching oxygen in the middle layer of the raw material charging layer as a part of the exhaust gas circulation process technology in the sintering machine. That is, in this proposal, oxygen-enriched air and circulating exhaust gas are sucked into the middle layer of the raw material charging layer, and the exhaust gas after the reaction of these gases is further sucked into the lower layer of the raw material charging layer and circulated. It is a technology to make it. However, since the oxygen concentration of the circulating exhaust gas is low, this technique causes a stagnation of the combustion reaction in the lower layer portion, and therefore, it is a method of enriching the middle layer portion with a low concentration of oxygen in advance.
- this technique is not a technique for promoting the sintering reaction in the middle layer portion.
- the exhaust gas circulation process in this technology is to reduce the environmental load caused by the exhaust gas from the sintering machine, and the ratio of the area that sucks oxygen-enriched air and the circulating exhaust gas is the raw material, the sintering machine, and so on. It should be designed according to the conditions of the exhaust gas treatment equipment, and the effect of the sintering reaction due to pure oxygen enrichment is not expected. Therefore, it can be said that it is originally desirable that the oxygen enrichment in the sintered raw material layer is not used in combination with the exhaust gas circulation process.
- An object of the present invention is to increase high-strength sinter by performing appropriate oxygen enrichment at a position closer to the excretion part than the ignition position without using gaseous fuel in the operation of the sinter.
- the purpose is to propose a method that can maintain the production rate and manufacture.
- the inventors stopped the supply of gaseous fuel from above the sintering bed (raw material charging layer) of the sintering machine, while on oxygen enrichment.
- the method as disclosed in Patent Document 1 that is, when the upper layer portion of the sintered bed (raw material charging layer) is enriched with oxygen at the timing of combustion, the yield is improved, but the product (sintered ore). It was found that the strength of the bed did not increase much.
- the inventors attempted to enrich oxygen using oxygen-enriched air at the timing of combustion not only in the upper layer of the raw material charging layer but also in the middle layer and the lower layer.
- the pulverization rate at the time of crushing is low, a certain degree of strength can be expected, and the yield is reduced, but the production is performed.
- the rate it was found that the strength of the entire product can be dramatically increased without lowering it.
- a sintered compound raw material containing iron ore or a carbonaceous material is charged into a raw material supply section on a pallet that is circulated and moved by a sintering machine to form a raw material charging layer, and then the raw material supply is performed.
- the igniter arranged on the downstream side of the ore portion ignites the carbonaceous material on the upper surface (upper layer portion) of the raw material charging layer, while the upper surface of the raw material charging layer is ignited through the windbox arranged below the pallet.
- sucking a gas introducing the gas into the raw material charging layer, and sequentially burning the carbonaceous material in the raw material charging layer to calcin the compounded raw material to produce a sinter.
- the oxygen enrichment time in the raw material charging layer is 1 to 7 minutes in terms of the passing time of the sintered blended raw material.
- oxygen enrichment is not performed until 4 minutes have passed after the upper surface of the charging layer is ignited.
- the above method according to the present invention is not used in combination with the exhaust gas circulation process.
- the oxygen concentration of the oxygen-enriched air introduced into the raw material charging layer is 25 vol. It is preferably more than%.
- the effect of oxygen enrichment can be improved and the strength of the sinter can be improved.
- the operation of oxygen enrichment in the raw material charging layer based on the prior art a method of assisting the combustion of coke at an early timing (immediately after ignition) to the upper part of the sintered bed (sintered raw material layer)? Since it is a technology for supplementing circulating exhaust gas, it was effective in improving the yield, but the improvement in strength could not be expected so much.
- the method of the present invention since it is a method of performing oxygen enrichment treatment in the middle layer portion and the lower layer portion of the sintered bed (raw material charging layer), the yield (production rate) is lowered. However, the strength of the entire product (sintered ore) can be dramatically increased.
- the treatment since the treatment is suitable for oxygen enrichment in the middle layer of the raw material charging layer, it becomes possible to alleviate the excessive heat supply, so that the strength is conversely lowered. It is possible to avoid the phenomenon of spilling. That is, in the method of the present invention, since oxygen can be effectively enriched in the middle layer of the raw material charging layer, the effect of improving the strength is enhanced.
- the oxygen enrichment in the upper layer and / or the lower layer of the raw material charging layer has a lower effect of improving the strength than the oxygen enrichment in the middle layer, but the oxygen enrichment in the middle layer. Since it does not hinder the effect of conversion, it may be carried out in combination with this on the premise of oxygen enrichment in the middle layer.
- the present invention is a method for producing a sintered ore by performing an oxygen enrichment operation with a downward suction type dwightroid (DL) sintering machine.
- DL downward suction type dwightroid
- the present invention is a method of oxygen-enriching by spraying an oxygen-enriched gas from above the raw material charging layer on the sintering machine pallet after a predetermined time has elapsed after ignition. That is, in the present invention, in the case of a normal sintering machine pallet speed (1.5 to 3.5 m / min) after the upper surface of the raw material charging layer is ignited, oxygen is oxygen after a position about 4 minutes later. It is characterized by performing oxygen enrichment by a method of supplying enriched gas, and then performing an oxygen enrichment process of continuing it on the excretion part side for a certain period of time to sinter.
- the time when the upper surface of the raw material charging layer is ignited can be determined by measurement with a thermometer or the like, but for convenience, the time when it passes through the outlet of the ignition furnace may be ignited.
- oxygen enrichment in the middle layer of the raw material charging layer by introducing the oxygen enriched gas at the above position, it is obtained by enriching the air obtained by directly sucking the outside air with a predetermined concentration of oxygen.
- oxygen-enriched air or attempting to circulate the exhaust of the sintering machine, prevent abnormal combustion to unintended locations due to leakage of oxygen-enriched oxygen. Therefore, in order to realize reliable oxygen enrichment in the designated place, it is desirable to use a hood-like cover or the like to supply oxygen into the hood.
- the oxygen concentration of the oxygen-enriched air to be introduced is 21 vol. % Or more, 50 vol. It is desirable that it is less than%. The reason is that the oxygen concentration after oxygen enrichment is 50 vol. If it exceeds%, the coke burns faster and the moving speed of the combustion zone increases, which reduces the high-temperature holding time in which the combustion region stays in each layer, and the sintering reaction does not proceed sufficiently. Then, the oxygen concentration after oxygen enrichment was 21 vol. This is because when it is less than%, the oxygen concentration is lower than that of normal air, and the oxygen concentration is lower than when the outside air is directly sucked, which lowers the sinterability.
- sintering raw material a sintering compound raw material as shown in Table 1 adjusted so that the basicity (B2) was 2.0 was used. Then, this sintered compound raw material was granulated with a drum mixer while adding water so that the water content was 7.5 mass%, and the obtained granulated product was fired using a baking pan. In this firing test, the wind pressure was constant (6 kPa), and the oxygen concentration of the oxygen-enriched air was 30 vol. I tried to be%.
- the oxygen enrichment in the sintered bed has passed 4 minutes after ignition in consideration of the oxygen enrichment effect in the upper layer portion (Comparative Example 2) and the lower layer portion (Invention Example 2). It is effective to carry out at a position closer to the excretion part side than the position where the sinter was performed.
- the influence of the oxygen enrichment time in the middle layer of the sintering raw material layer is verified.
- a sintered compound raw material (Table 1) adjusted to have SiO 2: 4.9 mass% and basicity: 2.0 was used.
- This sintered compound raw material was granulated with a drum mixer while adding water so that the water content was 7.5 mass%, and the obtained granulated sintered raw material was subjected to a firing test using a baking pan. The firing was carried out with a constant wind pressure (6 kPa), and the oxygen concentration of the granulation sintering raw material was 30 vol. It was adjusted to% and used for the test.
- the firing time of the base without oxygen enrichment (Comparative Example 1) was 15.5 minutes. Further, in this test, the timing of oxygen enrichment was set within the period of 5.8 to 10.6 minutes after ignition (middle layer portion), and the oxygen enrichment time at this time was 0.3 to 4.8 min. Changed to.
- the oxygen enrichment time in the middle layer was secured at 1.0 minute or more, at least the production rate and the sinter strength (TI strength) were greatly improved. It was.
- the oxygen enrichment time is not particularly specified, but as described above, the enrichment time for the middle layer is 4.8 minutes and the time for the lower layer is 2.5 minutes, which is 53% of 4.8 minutes, for a total of 7 minutes. Was considered to be effective.
- the influence of the oxygen concentration during the oxygen enrichment treatment on the middle layer of the sintering raw material layer was verified.
- a sintered blended raw material adjusted to have SiO 2 : 4.9 mass% and basicity: 2.0 was used (Table 1).
- This sintered compound raw material was granulated with a drum mixer while adding water so that the water content was 7.5 mass%, and the obtained granulated sintered raw material was subjected to a firing test using a baking pan.
- the firing was carried out with a constant wind pressure (6 kPa), and the oxygen concentration of the granulation sintering raw material was 30 vol.
- the test was carried out using oxygen-enriched air adjusted to%.
- the above-mentioned description of the present invention is mainly based on the operation of a sintering machine that does not use gas fuel, but it can also be applied to the operation of a sintering machine that also uses gas fuel.
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Abstract
Description
(2)本発明に係る上記方法については、原料装入層への酸素富化の時間を、焼結配合原料の通過時間にして1~7分間とすることが好ましい。
(3)本発明に係る上記方法については、装入層の上表面が点火されてから4分経過するまでは酸素富化を行わないことが好ましい。
(4)本発明に係る上記方法については、排ガス循環プロセスと併用しないことが好ましい。
(5)本発明に係る上記方法については、前記原料装入層に導入する酸素富化空気の酸素濃度は25vol.%超であることが好ましい。
この試験では、焼結ベッド(原料装入層)を高さ方向に三等分(上層、中層、下層)に分け、それぞれの位置に酸素富化空気を導入する方式での酸素富化を行う試験を行った。まず、ベースケースとして酸素富化を行わない焼成試験(比較例1)を行い、ベース(基準)となる焼成時間(15.5分)を決定した。その焼成時間から点火作業に必要な1分間を引いた時間を3等分にした時間を酸素富化時間とした(下記式)。
酸素富化時間=(ベースの焼成時間-1)/3
Claims (6)
- 焼結機の循環移動するパレット上の原料給鉱部に鉄鉱石や炭材を含む焼結配合原料を装入して原料装入層を形成し、次いで、該原料給鉱部の下流側に配設した点火炉で前記原料装入層の上表面(上層部)の炭材に点火する一方、パレット下方に配設したウインドボックスを介して前記原料装入層上方のガスを吸引して、そのガスを該原料装入層中に導入してこの原料装入層中の炭材を順次に燃焼させることにより配合原料を焼成して焼結鉱を製造する方法において、焼結機上の前記原料装入層の上方から酸素富化を行う際に、該原料装入層の上表面が点火されてから4分経過した位置よりも排鉱部側寄りの位置にて酸素富化の処理を行って焼結させることを特徴とする焼結鉱の製造方法。
- 前記原料装入層に点火されてから13分経過するまでには酸素富化を終了させることを特徴とする請求項1に記載の焼結鉱の製造方法。
- 原料装入層への酸素富化の時間を、焼結配合原料の通過時間にして1~7分間とすることを特徴とする請求項1または2に記載の焼結鉱の製造方法。
- 装入層の上表面が点火されてから4分経過するまでは酸素富化を行わないことを特徴とする請求項1~3のいずれか1項に記載の焼結鉱の製造方法。
- 排ガス循環プロセスと併用しないことを特徴とする請求項1~4のいずれか1項に記載の焼結鉱の製造方法。
- 前記原料装入層に導入する酸素富化空気の酸素濃度は、25vol.%超であることを特徴とする請求項1~5のいずれか1項に記載の焼結鉱の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
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BR112022015475A BR112022015475A2 (pt) | 2020-02-27 | 2021-02-22 | Método para produzir minério sinterizado |
CN202180014681.5A CN115135781A (zh) | 2020-02-27 | 2021-02-22 | 烧结矿的制造方法 |
KR1020227027742A KR20220126755A (ko) | 2020-02-27 | 2021-02-22 | 소결광의 제조 방법 |
JP2022503593A JP7384268B2 (ja) | 2020-02-27 | 2021-02-22 | 焼結鉱の製造方法 |
EP21761195.3A EP4112756A4 (en) | 2020-02-27 | 2021-02-22 | PROCESS FOR MAKING SINTERED ORE |
US17/801,141 US20230085232A1 (en) | 2020-02-27 | 2021-02-22 | Method for producing sintered ore |
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JP2020-031953 | 2020-02-27 | ||
JP2020031953 | 2020-02-27 |
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US (1) | US20230085232A1 (ja) |
EP (1) | EP4112756A4 (ja) |
JP (1) | JP7384268B2 (ja) |
KR (1) | KR20220126755A (ja) |
CN (1) | CN115135781A (ja) |
BR (1) | BR112022015475A2 (ja) |
WO (1) | WO2021172254A1 (ja) |
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JP2014031580A (ja) | 2012-07-12 | 2014-02-20 | Jfe Steel Corp | 焼結機の酸素−気体燃料供給装置 |
JP2015157979A (ja) * | 2014-02-24 | 2015-09-03 | Jfeスチール株式会社 | 焼結鉱の製造方法 |
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JP3395505B2 (ja) | 1996-02-26 | 2003-04-14 | 日本鋼管株式会社 | 無端移動型焼結機の操業方法 |
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- 2021-02-22 WO PCT/JP2021/006552 patent/WO2021172254A1/ja active Application Filing
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- 2021-02-22 KR KR1020227027742A patent/KR20220126755A/ko not_active Application Discontinuation
- 2021-02-22 EP EP21761195.3A patent/EP4112756A4/en active Pending
- 2021-02-22 US US17/801,141 patent/US20230085232A1/en active Pending
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EP4112756A1 (en) | 2023-01-04 |
KR20220126755A (ko) | 2022-09-16 |
JPWO2021172254A1 (ja) | 2021-09-02 |
EP4112756A4 (en) | 2023-01-11 |
CN115135781A (zh) | 2022-09-30 |
US20230085232A1 (en) | 2023-03-16 |
BR112022015475A2 (pt) | 2022-09-27 |
JP7384268B2 (ja) | 2023-11-21 |
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