KR100884243B1 - Method for manufacturing molten steel containing lowphosphorus using pig iron manufactured by finex process - Google Patents

Method for manufacturing molten steel containing lowphosphorus using pig iron manufactured by finex process Download PDF

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KR100884243B1
KR100884243B1 KR20070115126A KR20070115126A KR100884243B1 KR 100884243 B1 KR100884243 B1 KR 100884243B1 KR 20070115126 A KR20070115126 A KR 20070115126A KR 20070115126 A KR20070115126 A KR 20070115126A KR 100884243 B1 KR100884243 B1 KR 100884243B1
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South Korea
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molten iron
finex
slag
manufacturing
hot metal
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KR20070115126A
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Korean (ko)
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김영화
정성호
김주국
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주식회사 포스코
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    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/30—Regulating or controlling the blowing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/16—Making or repairing linings increasing the durability of linings or breaking away linings
    • F27D1/1678—Increasing the durability of linings; Means for protecting
    • F27D1/1684—Increasing the durability of linings; Means for protecting by a special coating applied to the lining
    • 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
    • C21C2200/00—Recycling of waste material
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)

Abstract

A method for manufacturing molten steel containing low-phosphorus using finex hot metal is provided to use decarbonization slag as a material instead of quicklime in order to protect a furnace and reduce manufacturing cost by reducing the amount of quicklime to be used as a material. A method for manufacturing molten steel containing low-phosphorus using finex hot metal comprises the following steps. Fine iron ore is reduced using fluidized reduction furnaces(3,4,5) and inputted into a melting furnace to manafacture a hot metal. A furnace is coated with decarbonization slag. Finex hot metal and scrap iron are inputted into the furnace. The finex hot metal is smelted. The smelted finex hot metal is pulled out. The basicity of decarbonization slag is from 6.5 to 7.5.

Description

파이넥스 용선을 이용한 저린강의 제조방법{Method for Manufacturing Molten Steel containing LowPhosphorus Using Pig Iron Manufactured by Finex Process}Method for Manufacturing Molten Steel containing LowPhosphorus Using Pig Iron Manufactured by Finex Process}

본 발명은 파이넥스 용선을 이용한 저린강의 제조방법에 관한 것으로, 더욱 상세하게는 노체를 보호하고 생석회의 투입량을 감소시킬 수 있는 파이넥스 용강을 이용한 저린강의 제조방법에 관한 것이다.The present invention relates to a method for manufacturing low-lining steel using Finex molten iron, and more particularly, to a method for producing low-lining steel using Finex molten steel that can protect the furnace body and reduce the amount of quicklime.

현재 철강생산의 주류를 담당하고 있는 고로 제선법은 고열효율, 고생산성, 고환원능력 및 긴 설비수명 등의 특성을 구비하여 기술적으로는 거의 완성된 공정이라 생각할 수 있다. 그러나, 고로 제선법은 고품위 철광석의 사용, 분광석의 괴성화 처리, 원료탄의 수급문제 및 코크스로의 환경오염문제 등을 갖고 있다. 특히 대량 생산방식으로 생산량의 조절이 어려워 시장수요의 변화에 따른 탄력적인 적용이 어렵다는 단점을 가지고 있다.The blast furnace making method, which is currently in charge of the mainstream of steel production, can be considered as a technically almost completed process with characteristics such as high thermal efficiency, high productivity, high reduction capacity and long equipment life. However, the blast furnace iron-making method has the use of high-grade iron ore, the hardening process of spectroscopy, the supply-demand problem of a raw coal, and the environmental pollution to coke oven. In particular, the mass production method is difficult to control the production volume has the disadvantage that it is difficult to apply elastically according to changes in market demand.

이에 따라 세계 각국에서는 고로 대체 제철법으로 용융환원제철법에 대한 연구가 활발히 진행되고 있다. 용융환원제 철법은, 전처리공정을 생략한 철광석과 일반탄을 직접 사용할 수 있는 신제철법으로, 예비환원로와 용융환원로로 구성되어 있다. 용융환원제철법에는 코렉스(COREX) 공법과 파이넥스(FINEX) 공법이 실용화되어 있다.As a result, researches on the molten-reduction steelmaking method are actively underway in alternative countries. The molten reducing agent iron method is a new steelmaking method which can directly use iron ore and general coal, which omit the pretreatment step, and is composed of a preliminary reduction furnace and a molten reduction furnace. In the melt reduction steelmaking method, the COREX method and the FINEX method are put to practical use.

코렉스 공법은, 도 1에 나타난 바와 같이 예비 환원로(2)에서 8~30mm의 철광석(괴광)을 용융로(1)의 환원가스로 환원하여 배출하고, 8~50mm의 석탄이 충전된 용융로(1)에 배출된 환원광을 공급하여 용선을 제조한다. 철광석의 환원에 필요한 가스는 석탄 탈휘반응에서 20%, 석탄중 카본의 산소에 의한 연소반응에 의해 80%가 발생한다. 이러한 코렉스 공법에서는 괴광과 괴탄만을 사용하는 단점이 있다.As shown in FIG. 1, the Corex method reduces and discharges 8 to 30 mm of iron ore (lump) in the preliminary reduction furnace 2 to the reducing gas of the melting furnace 1 and discharges the coal having 8 to 50 mm of coal (1). The molten iron is manufactured by supplying the reduced ore discharged to The gas required for the reduction of iron ore is 20% in the coal devolatilization reaction, and 80% is generated by the combustion reaction of oxygen in the coal. In the Korex method, there is a disadvantage of using only lumps and lumps.

상기와 같은 코렉스 공법의 단점을 해결하기 위하여 파이넥스 공법에서는 도 2에 나타난 바와 같이, 다단계의 유동층 환원로(3, 4, 5)를 이용하여 분철광석을 환원시킨후 석탄이 충전된 용융로(1)에 장입하여 용선을 제조하는 것이다. 이렇게 파이넥스 공법으로 제조된 용선은, 예비처리에서 발생하는 황산화물(SOx), 질소산화물(NOx), 이산화탄소 배출량이 고로 공정보다 현저히 낮다. In order to solve the drawbacks of the Korex method as described above, in the Finex method, as shown in FIG. 2, the coal-filled smelter 1 is reduced by using the multi-stage fluidized-bed reduction furnaces 3, 4, and 5. It is charged in to manufacture molten iron. The molten iron produced by the Finex method has significantly lower sulfur oxides (SOx), nitrogen oxides (NOx), and carbon dioxide emissions than the blast furnace process.

이와 같이 파이넥스 공법에 의해 제조된 용선은 종래의 일반 고로 제선법에 의해 제조된 용선에 비해 P의 함량이 높고 Mn의 함량이 낮다. 따라서, 파이넥스 용선은 전로 공정 시 슬래그와 부원료의 재화불량으로 인하여 취련 초기에 스피팅이 발생하여 랜스에 지금이 과도하게 부착되므로 형석이 고로 제선법 보다 2배 이상 투입된다. 이에 따라, 전로내의 강욕 온도가 저하되고 이를 보상하기 위하여 산소를 과취하여야 하므로 노체의 손상을 가져오게 된다. 또한, 취련 중기에 슬로핑 현상이 발생되어 슬래그가 노외로 넘쳐 적정한 염기도를 확보할 수 없어 다량의 생석회가 투입되는 문제점이 있다.Thus, the molten iron manufactured by the Finex method is higher in the content of P and lower in the content of Mn than the molten iron prepared by the conventional general blast furnace method. Therefore, FINEX molten iron is sputtered at the initial stage of the blown-up due to the poor stock of slag and subsidiary materials in the converter process, and is now excessively attached to the lance. Accordingly, the temperature of the bath in the converter is lowered and oxygen must be ingested in order to compensate for this, resulting in damage to the furnace body. In addition, there is a problem that a large amount of quicklime is injected into the slinging phenomenon occurs because the slag overflows to the outside of the furnace to ensure proper basicity.

본 발명은 상기와 같은 문제점을 해결하기 위한 것으로, 파이넥스 용선을 이용하여 저린강을 제조할 때 노체를 보호하고 생석회의 투입량을 감소시킬 수 있는 파이넥스 용선을 이용한 저린강의 제조방법을 제공하는데 그 목적이 있다.The present invention is to solve the above problems, to provide a method for manufacturing low-lining steel using Finex molten iron that can protect the furnace body and reduce the amount of quicklime when manufacturing low-lining steel using Finex molten iron. have.

상기와 같은 목적을 달성하기 위한 본 발명의 기술적 사상으로는, 전 차지에서 형성된 탈탄 슬래그로 전로를 코팅하는 슬래그 코팅단계와, 상기 전로에 파이넥스 용선 및 고철을 장입하는 용선 장입단계와, 상기 용선을 취련하는 취련단계와, 상기 취련된 용선을 출강하는 출강단계를 포함하는 파이넥스 용선을 이용한 저린강의 제조방법에 의해 달성된다.Technical concept of the present invention for achieving the above object, the slag coating step of coating the converter with decarburization slag formed in the former charge, the molten iron charging step of charging the finex molten iron and scrap iron in the converter, and the molten iron It is achieved by a method of manufacturing low-lining steel using a finex molten iron comprising a blow stage of blowing and a tapping step of tapping the blown molten iron.

여기서, 상기 탈탄 슬래그는 염기도가 6.5~7.5인 것이 바람직히다.Here, the decarburized slag preferably has a basicity of 6.5 to 7.5.

또한, 상기 용선 장입단계는 소결광 전체 투입량의 30%가 용선 장입전에 투입되고, 용선 장입후에 30%가 투입되는 것이 바람직하다.In the molten iron charging step, 30% of the total amount of the sintered ore is charged before the molten iron is charged, and 30% is added after the molten iron is charged.

또한, 상기 취련단계는 취련 5%시점에서 고형화된 고염기도 슬래그를 분할 투입하는 것이 바람직하다.In addition, in the blowing step, it is preferable to separately input slag solidified high base degree at 5% time point of blowing.

그리고, 상기 취련단계는 취련 10%부터 취련 40%시점에서 소결광 전체 투입량의 40%가 분할 투입되는 것이 바람직하다.In addition, in the blowing step, 40% of the total amount of sintered ore input is preferably split at 10% from 40% of the blowing time.

본 발명에 의한 파이넥스 용강을 이용한 저린강의 제조방법은, 탈린 시 생석 회를 대체하여 탈탄 슬래그가 사용됨으로써 노체를 보호할 수 있고 생석회의 투입량을 감소시킬 수 있어 저린강의 제조비용을 절감할 수 있는 효과가 있다.The method for manufacturing low-lining steel using the Finex molten steel according to the present invention can replace the quick-lime slag during delineation, thereby protecting the furnace body and reducing the input amount of quick-lime, thereby reducing the manufacturing cost of low-lining steel. There is.

이하, 본 발명에 따른 실시예를 첨부된 도면에 따라 보다 상세히 설명한다.Hereinafter, embodiments according to the present invention will be described in more detail with reference to the accompanying drawings.

도 3은 본 발명에 따른 탈린 취련 패턴을 나타낸 그래프이며, 도 4는 본 발명에 따른 용선 [P]의 농도를 나타낸 그래프이다. 도면을 참조하여 설명하면, 본 발명은 파이넥스 용선을 전로에 장입한 후 산소랜스를 통해 산소를 상취하고, 전로 하부에 불활성 가스를 함께 취입한 후 출강하는 단계를 포함하는 저린강의 제조방법에 적용된다. 이때, 상기 파이넥스 용선은 표 1에 나타난 바와 같이 일반 고로 용선에 비해 P의 함량이 높고 Mn의 함량이 낮다3 is a graph showing the Tallinn blowing pattern according to the present invention, Figure 4 is a graph showing the concentration of molten iron [P] according to the present invention. Referring to the drawings, the present invention is applied to the manufacturing method of low-lining steel, including the step of charging oxygen after charging the Finex molten iron in the converter, and injecting the inert gas in the lower part of the converter. . At this time, the Finex molten iron has a higher content of P and a lower content of Mn than the general blast furnace molten iron as shown in Table 1

CC SiSi MnMn PP SS TiTi 일반고로 용선General blast furnace charter 4.5%4.5% 0.4%0.4% 0.35%0.35% 0.100%0.100% 0.08%0.08% 0.74%0.74% 파이넥스 용선Finex charter 4.3%4.3% 0.55%0.55% 0.25%0.25% 0.160%0.160% 0.09%0.09% 0.64%0.64%

이와 같은 조성을 갖는 파이넥스 용선을 이용한 전로 취련시 취련구간별로 캐비티깊이(L)/강욕 깊이(L0)의 비, 하취유량, 및 부원료 투입조건 등을 적절히 제어하게 된다.When the converter is blown using the FINEX molten iron having such a composition, the ratio of the cavity depth L / bath depth L0, the underflow flow rate, and the subsidiary feed conditions are appropriately controlled.

상기와 같은 조성을 갖는 파이넥스 용선을 이용하여 저린강을 제조하기 위해서는 슬래그 코팅단계와 용선 장입단계와 취련단계 및 출강단계를 거치게 된다. 즉, 슬래그 코팅단계는 전 차지에서 형성된 탈탄 슬래그로 전로를 코팅하여 노체를 보호하게 되는데, 이때 탈탄 슬래그의 염기도는 6.5~7.5이다. 상기와 같은 고염기도를 갖는 탈탄 슬래그로 전로 코팅되면, 전로에 파이넥스 용선 및 고철을 장입하는 용선 장입단계가 실시된다.In order to manufacture the low-lining steel using the Finex molten iron having the composition as described above is subjected to a slag coating step, the molten iron charging step, the blowing step and the tapping step. That is, the slag coating step is to protect the furnace body by coating the converter with the decarburized slag formed in the charge, the basicity of the decarburized slag is 6.5 ~ 7.5. When the converter is coated with decarburized slag having a high base as described above, a molten iron charging step of charging the Finex molten iron and the scrap iron into the converter is performed.

상기 용선 장입단계는, 파이넥스 용선이 전로에 장입되기 전에 소결광 전체 투입량의 30%에 해당하는 소결광이 전로에 투입되고, 파이넥스 용선이 전로에 장입된 후 소결광 전체 투입량의 30%에 해당하는 소결광이 전로에 투입되는 것이 바람직하다. In the molten iron charging step, the sintered ore corresponding to 30% of the total amount of sintered ore is charged into the converter before the Finex molten iron is charged into the converter, and the sintered ore corresponding to 30% of the total amount of the sintered ore is charged after the Finex molten iron is charged into the converter. It is preferable to add to.

상기와 같이 용선이 전로에 장입되면 파이넥스 용선을 탈린, 탈탄 처리하는 취련단계가 실시되는데 대략 취련 개시~취련 40%시점은 탈린기에 해당하며 취련 40%~ 취련 100%시점은 탈탄기에 해당한다.As described above, when the molten iron is charged into the converter, a coalescing step of delineating and decarburizing the Finex molten iron is performed, and approximately 40% of the start of the blow corresponds to a delinquency and 100% of the blow corresponds to the decarburizer.

상기 취련 개시~취련 10%시점에서는, 캐비티 깊이(L)/강욕 깊이(Lo)를 0.49로 유지하며, 하취유량을 0.03Nm3으로 하드브로우잉 적용하고, 취련 5%시점에서 고형화된 고염기도 슬래그를 2회 분할 투입하여 슬래그와 부원료의 재화를 유도한다.From the start of the blow to the blow 10%, the cavity depth (L) / bath depth (Lo) is maintained at 0.49, the hard blow application is applied to the lower odor flow rate of 0.03 Nm 3 , solidified at the 5% point of blowing slag Induce the slag and secondary raw materials by splitting twice.

여기서, 상기 고형화된 고염기도 슬래그는, 형석(CaF2) 대용으로 부원료 재화촉진을 목적으로 투입되는 것으로서, 그 투입량이 너무 적은 경우에는 투입효과가 미약하고, 너무 많이 투입되는 경우에는 갑작스러운 덩어리 슬래그 투입과 잔류 슬래그, 철산화물과의 갑작스러운 반응으로 CO가스가 발생하게 되어 슬로핑이 발생하게 되므로, 고형화된 고염기도 슬래그의 투입량은 대략 500kg씩 2회 분할 투입되는 것이 바람직하다.Here, the solidified high base also slag is input for the purpose of promoting the secondary raw material goods in place of fluorite (CaF 2 ), if the input amount is too small, the input effect is weak, if the input too much sudden agglomerated slag Since the CO gas is generated by the sudden reaction between the input and the remaining slag and the iron oxide, the slope is generated. Therefore, the input amount of the solidified highly basic slag is preferably divided into about 500 kg twice.

또한, 취련 10%~취련 40%시점에서는 고융점을 갖는 2CaO·SiO 2 형성과 슬래그 중 T.Fe 환원에 의한 슬래그 융점 및 점도가 상승하게 되는데, 이 시점에서 소결광 전체 투입량의 40%에 해당하는 소결광을 분할 투입하게 된다.In addition, at the time of 10% to 40% of blow, the slag melting point and viscosity due to the formation of 2CaO · SiO 2 having a high melting point and the reduction of T.Fe in the slag are increased, which corresponds to 40% of the total amount of sintered ore input. The sintered ore is divided and added.

취련 40%~취련 100%시점에서는 랜스 높이와 송산 유량을 낮게 유지한다. 즉, 취련 개시~취련 40%일 때 캐비티 깊이(L)/강욕 깊이(Lo)가 0.19이고, 이때 송산 유량은 25,000Nm3이고, 랜스 높이는 2,500mm이다. 그러나 취련 40%가 넘는 시점에서 캐비티 깊이(L)/강욕 깊이(Lo)가 0.09이고, 송산 유량은15,000Nm3이고 랜스 높이는 2,300mm가 되도록 취련 패턴을 제어한다(도 3 참조).When the blow rate is 40% to the blow rate 100%, the lance height and delivery flow rate are kept low. That is, when the start of the blow to the blow 40%, the cavity depth (L) / depth of bath (Lo) is 0.19, wherein the delivery flow rate is 25,000 Nm 3 , the lance height is 2,500 mm. However, the blowing pattern is controlled such that the cavity depth (L) / bath depth (Lo) is 0.09, the feeding flow rate is 15,000 Nm 3, and the lance height is 2,300 mm at the time when the blowing is over 40% (see FIG. 3).

그리고, 취련이 완료되는 시점에서는 송산을 멈추고 용강 온도를 측정하게 되는데, 이때 하취 유량을 0.10으로 하여 강교반을 일으켜 탈린을 유도하고, 출강전에 린스(Rinse)를 5분정도 실시하고 출강하게 된다.At the time of completion of the blow, the transmission is stopped and the molten steel temperature is measured. At this time, the deodorizing flow rate is set to 0.10 to cause steel stirring to induce Tallinn, and the tapping is performed for 5 minutes before the tapping.

상기와 같이 본 발명에 따라 저린강을 제조하게 될 경우 표 2와 표 3에 나타난 바와 같이 부원료, 특히 생석회의 투입량이 비교예(종래)에 비해 절감되는 것을 알 수 있고, 도 4에 나타난 바와 같이 용선의 탈린 효과가 향상됨을 알 수 있다.When manufacturing low-lining steel according to the present invention as described above, as shown in Table 2 and Table 3 it can be seen that the input of the raw materials, especially quicklime is reduced compared to the comparative example (conventional), as shown in Figure 4 It can be seen that the Tallinn effect of the molten iron is improved.

*비교예의 부원료 투입기준(초기투입량/분할투입량)* Additional criteria for subsidiary materials of comparative example (initial dose / split dose) 용선[Si] (%)Melting line [Si] (%) 생석회 (톤/Ch)Quicklime (ton / Ch) 경소백운석 (톤/Ch)Minor Dolomite (Ton / Ch) 형석 (톤/Ch)Fluorite (Ton / Ch) 송산량 (Nm3/Ch)Transmission rate (Nm 3 / Ch) 0.15이하0.15 or less 1.6/3.01.6 / 3.0 1.31.3 1.01.0 30003000 0.15~0.200.15-0.20 2.6/3.02.6 / 3.0 1.31.3 1.01.0 32003200 0.20~0.250.20-0.25 3.4/3.03.4 / 3.0 1.31.3 1.01.0 33503350 0.26~0.300.26-0.30 3.9/3.03.9 / 3.0 1.31.3 1.01.0 35003500 0.31~0.350.31-0.35 4.0/4.04.0 / 4.0 1.31.3 1.01.0 36503650 0.36~0.400.36-0.40 4.8/5.04.8 / 5.0 1.31.3 1.01.0 38003800 0.40~0.450.40-0.45 5.0/5.55.0 / 5.5 1.31.3 1.01.0 39503950 0.45~0.500.45-0.50 5.7/6.05.7 / 6.0 1.31.3 1.01.0 41004100 0.5이상0.5 or more 6.0/6.56.0 / 6.5 1.31.3 1.01.0 42504250

*비교예의 생석회 투입기준* Comparison example of quicklime input

적산량(%)Accumulation amount (%) 30%30% 35%35% 45%45% 50%50% 65%65% 생석회quicklime 50%50% -- 50%50% -- -- 소결광Sintered ore -- 40%40% -- 30%30% 30%30%

*본 발명의 부원료 투입기준(초기투입량/분할투입량)* Additional criteria of subsidiary materials of the present invention (initial dose / divided dose) 용선[Si] (%)Melting line [Si] (%) 생석회/탈탄슬래그(톤/Ch)Quicklime / Decarburized Slag (Ton / Ch) 경소백운석 (톤/Ch)Dolomite (Ton / Ch) 형석 (톤/Ch-2회)Fluorite (Tone / Ch-2) 송산량 (Nm3/Ch)Transmission rate (Nm 3 / Ch) 0.15이하0.15 or less 1.6/2.01.6 / 2.0 1.31.3 1.01.0 29002900 0.15~0.200.15-0.20 2.0/2.02.0 / 2.0 1.31.3 1.01.0 30003000 0.20~0.250.20-0.25 2.4/2.72.4 / 2.7 1.31.3 1.01.0 31503150 0.26~0.300.26-0.30 2.9/3.02.9 / 3.0 1.31.3 1.01.0 33003300 0.31~0.350.31-0.35 3.5/3.53.5 / 3.5 1.31.3 1.01.0 34503450 0.36~0.400.36-0.40 4.5/4.04.5 / 4.0 1.31.3 1.01.0 36003600 0.40~0.450.40-0.45 4.7/4.54.7 / 4.5 1.31.3 1.01.0 37503750 0.45~0.500.45-0.50 5.1/5.05.1 / 5.0 1.31.3 1.01.0 39003900 0.5이상0.5 or more 5.5/6.05.5 / 6.0 1.31.3 1.01.0 40504050

*본 발명의 부원료 분할투입기준(초기투입량 제외)* Subdivision input standard of the present invention (excluding initial input amount)

적산량(%)Accumulation amount (%) 고철 장입전 탈탄슬래그Decarburized slag before scrap metal loading 용선 장입전Charter 5%5% 15%15% 생석회quicklime 1.6~5.5톤1.6-5.5 tons -- 1~3톤1 to 3 tons 1~3톤1 to 3 tons 소결광Sintered ore 30%30% 30%30% --

한편, 본 발명은 상술한 실시예로서만 한정되는 것이 아니라 본 발명의 요지를 벗어나지 않는 범위내에서 수정 및 변형하여 실시할 수 있고, 그러한 수정 및 변형이 가해진 것도 본 발명의 기술적 사상에 속하는 것으로 보아야 한다.On the other hand, the present invention is not limited only to the embodiments described above, but can be modified and modified within the scope not departing from the gist of the present invention, it should be seen that such modifications and variations are included in the technical idea of the present invention. do.

도 1은 코렉스 장치의 개념도이다.1 is a conceptual diagram of a Korex device.

도 2는 파이넥스 장치의 개념도이다.2 is a conceptual diagram of a Finex device.

도 3은 본 발명에 따른 탈린 취련 패턴을 나타낸 그래프이다.3 is a graph showing the Tallinn blowing pattern according to the present invention.

도 4는 본 발명에 따른 용선 [P]의 농도를 나타낸 그래프이다.4 is a graph showing the concentration of molten iron [P] according to the present invention.

<도면의 주요 부분에 대한 부호의 설명><Description of the symbols for the main parts of the drawings>

1 : 용융로 2 : 예비 환원로1: melting furnace 2: preliminary reduction furnace

3, 4, 5 : 유동층 환원로3, 4, 5: fluidized bed reduction furnace

Claims (5)

전 차지에서 형성된 탈탄 슬래그로 전로를 코팅하는 슬래그 코팅단계와,A slag coating step of coating the converter with decarburized slag formed at the charge; 상기 전로에 파이넥스 용선 및 고철을 장입하는 용선 장입단계와,A molten iron charging step of charging the finex molten iron and the scrap metal into the converter; 상기 용선을 취련하는 취련단계와,A blowing step of blowing the molten iron, 상기 취련된 용선을 출강하는 출강단계를 포함하는 파이넥스 용선을 이용한 저린강의 제조방법.Manufacturing method of low-lining steel using Finex molten iron including a tapping step of tapping the molten molten iron. 청구항 1 에 있어서,The method according to claim 1, 상기 탈탄 슬래그는 염기도가 6.5~7.5인 것을 포함하는 파이넥스 용선을 이용한 저린강의 제조방법.The decarburized slag is a low-lining steel manufacturing method using a Finex molten iron comprising a basicity of 6.5 ~ 7.5. 청구항 1 에 있어서,The method according to claim 1, 상기 용선 장입단계는 소결광 전체 투입량의 30%가 용선 장입전에 투입되고, 용선 장입후에 30%가 투입되는 것을 포함하는 파이넥스 용선을 이용한 저린강의 제조방법.The molten iron charging step is 30% of the total amount of the sintered ore input is injected before the molten iron charging, 30% after the molten iron loading method of manufacturing low-lining steel using a Finex molten iron. 청구항 1 에 있어서,The method according to claim 1, 상기 취련단계는 취련 5%시점에서 고형화된 전로의 탈탄 슬래그를 분할 투입하는 것을 포함하는 파이넥스 용선을 이용한 저린강의 제조방법.The method of manufacturing the low-lining steel using the Finex molten iron comprising the step of splitting the decarburization slag of the solidified converter at the 5% point of blowing. 청구항 1 에 있어서,The method according to claim 1, 상기 취련단계는 취련 10%부터 취련 40%시점에서 소결광 전체 투입량의 40%가 분할 투입되는 것을 포함하는 파이넥스 용선을 이용한 저린강의 제조방법.The method of manufacturing the low-lining steel using the Finex molten iron comprising the 40% of the total amount of the sintered ore is divided into 10% from 40% of the sintered ore injection.
KR20070115126A 2007-11-12 2007-11-12 Method for manufacturing molten steel containing lowphosphorus using pig iron manufactured by finex process KR100884243B1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000042513A (en) * 1998-12-26 2000-07-15 이구택 Method for refining electric furnace by using hot metal having small amount of silica
KR20000042501A (en) * 1998-12-26 2000-07-15 이구택 Method for refining electric furnace for production of low phosphor high carbon molten steel

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20000042513A (en) * 1998-12-26 2000-07-15 이구택 Method for refining electric furnace by using hot metal having small amount of silica
KR20000042501A (en) * 1998-12-26 2000-07-15 이구택 Method for refining electric furnace for production of low phosphor high carbon molten steel

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