KR100862799B1 - Method for Preventing Slag Inclusion in Converter Steel Tapping - Google Patents
Method for Preventing Slag Inclusion in Converter Steel Tapping Download PDFInfo
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- KR100862799B1 KR100862799B1 KR1020020045781A KR20020045781A KR100862799B1 KR 100862799 B1 KR100862799 B1 KR 100862799B1 KR 1020020045781 A KR1020020045781 A KR 1020020045781A KR 20020045781 A KR20020045781 A KR 20020045781A KR 100862799 B1 KR100862799 B1 KR 100862799B1
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- slag
- converter
- tapping
- carbon
- present
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- 239000002893 slag Substances 0.000 title claims abstract description 107
- 238000000034 method Methods 0.000 title claims abstract description 15
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims abstract description 35
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 19
- 229910000514 dolomite Inorganic materials 0.000 claims abstract description 19
- 239000010459 dolomite Substances 0.000 claims abstract description 19
- 238000002844 melting Methods 0.000 claims abstract description 18
- 238000010079 rubber tapping Methods 0.000 claims abstract description 16
- 239000007787 solid Substances 0.000 claims abstract description 8
- 239000011261 inert gas Substances 0.000 claims abstract description 6
- 230000008018 melting Effects 0.000 claims description 14
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 6
- 230000002265 prevention Effects 0.000 claims description 2
- 229910000831 Steel Inorganic materials 0.000 abstract description 23
- 239000010959 steel Substances 0.000 abstract description 23
- 239000000463 material Substances 0.000 abstract description 8
- 238000007670 refining Methods 0.000 abstract description 7
- 238000009628 steelmaking Methods 0.000 abstract description 4
- 239000007788 liquid Substances 0.000 abstract description 3
- 238000007664 blowing Methods 0.000 abstract description 2
- 238000010348 incorporation Methods 0.000 abstract description 2
- 238000002407 reforming Methods 0.000 abstract description 2
- 238000005422 blasting Methods 0.000 abstract 1
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 18
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 11
- 239000000395 magnesium oxide Substances 0.000 description 10
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 10
- 239000000292 calcium oxide Substances 0.000 description 9
- 235000012255 calcium oxide Nutrition 0.000 description 9
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 9
- 229910052742 iron Inorganic materials 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 2
- 239000003830 anthracite Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229910052814 silicon oxide Inorganic materials 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/36—Processes yielding slags of special composition
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B5/00—Treatment of metallurgical slag ; Artificial stone from molten metallurgical slag
- C04B5/06—Ingredients, other than water, added to the molten slag or to the granulating medium or before remelting; Treatment with gases or gas generating compounds, e.g. to obtain porous slag
-
- 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
-
- 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
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/15—Tapping equipment; Equipment for removing or retaining slag
- F27D3/1545—Equipment for removing or retaining slag
- F27D3/159—Equipment for removing or retaining slag for retaining slag during the pouring of the metal or retaining metal during the pouring of the slag
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
본 발명은 제강공정중, 전로 정련후 용강 출강시 수강 레이들로의 슬래그 유출을 방지하는 방법에 관한 것으로서, 정련용으로 전로에 투입되는 부원료를 이용하여 액상의 슬래그를 고상으로 만들고 경화킴으로써 별도의 장비나 자재를 구비함이 없이 전로 출강 작업시 수강레이들로 슬래그가 유출되는 것을 방지할 수 있는 방법을 제공하고자 하는데, 그 목적이 있다.The present invention relates to a method of preventing slag outflow into the steel ladle during the steelmaking step after the refining of the converter, and by using the auxiliary material input to the converter for refining to solidify and harden the liquid slag It is intended to provide a method for preventing slag from leaking into the taps during the tapping work of the converter without the equipment or materials.
본 발명은 전로 취련 종료후 탄소[C]를 투입하여 슬래그중의 산화철과 반응하게 하여 슬래그중의 저융점 슬래그를 고융점의 슬래그로 개질하는 단계;The present invention comprises the steps of reforming the low-melting slag in the slag to the slag of the slag by injecting carbon [C] after the completion of the converter blow to react with the iron oxide in the slag;
상기와 같이 개질된 슬래그에 경소 돌로마이트를 첨가하여 전체의 슬래그를 하나의 고상체로 만드는 단계; 및 Adding light dolomite to the slag modified as described above to make the whole slag into one solid body; And
불활성 가스를 취입하여 린싱(Rinsing)하는 단계를 포함하여 구성되는 전로 출강시 슬래그 혼입방지방법을 그 요지로 하고 있습니다.The main idea is to prevent slag incorporation during the tapping of converters, which includes the steps of blowing and rinsing inert gas.
전로취련, 용강, 슬래그, 혼입, 부원료, 탄소, 경소 돌로마이트, 린싱 Furnace blasting, molten steel, slag, mixing, subsidiary materials, carbon, small dolomite, rinsing
Description
도 1은 종래예와 본 발명예에 대한 레이들 슬래그 양에 따른 전로슬래그유출량의 변화를 나타내는 그래프1 is a graph showing a change in converter slag flow rate according to the amount of ladle slag for the conventional example and the present invention example
도 2는 종래예와 본 발명예에 대한 출강횟수에 따른 전로슬래그유출량의 변화를 나타내는 그래프2 is a graph showing a change in converter slag flow rate according to the number of tapping times for the conventional example and the present invention example
본 발명은 제강공정중, 전로 정련후 용강 출강시 수강 레이들로의 슬래그 유출을 방지하는 방법에 관한 것으로서, 보다 상세 하게는 전로 정련후 출강전에 부원료를 이용하여 슬래그를 개질 처리하여 저융점의 슬래그를 고융점화 함으로써 슬래그를 고상으로 존재하게 하여 출강구로 슬래그가 유출되는 것을 방지하는 전로 출강시 슬래그 혼입 방지하는 방법에 관한 것이다.The present invention relates to a method for preventing the outflow of slag into the steel ladle during the steelmaking step after the steelmaking process, more specifically, slag of the low melting point by modifying the slag using subsidiary materials before the steelmaking after tapping The present invention relates to a method for preventing slag mixing during the tapping of a converter to prevent the slag from flowing out into the tap by making the slag exist in a solid state by making the melting point high.
일반적으로, 고로에서 출선된 용선은 탈황 및 탈린등의 용선예비처리 단계를 거쳐 전로에 장입된다.In general, the chartered ships from the blast furnace is charged to the converter through the charter preliminary treatment steps such as desulfurization and delineation.
전로에 장입된 용선은 산소랜스를 통해 취입된 산소와 정련을 위하여 투입되는 생 석회, 백운석등에 의해 용선중에 함유된 실리콘, 카본, 망간, 인등이 산화반응에 의해서 제거되면서, 용강으로 변화된다. The molten iron charged into the converter is changed into molten steel by removing oxygen, carbon, manganese, phosphorus, etc. contained in molten iron by oxidized lime, dolomite, etc.
상기와 같이 용선이 용강으로 변화하는 과정에서 부원료등과 상기에서 언급한 각종 산화반응에 의하여 용강상부에는 슬래그가 발생하게 된다.In the process of changing the molten iron to molten steel as described above, slag is generated in the upper portion of the molten steel by the various raw materials and the above-described oxidation reaction.
한편, 상기와 같이 정련과정을 거친 용강은 최종품질의 규격을 만족시키도록 하기 위하여 이차 정련과정을 거치게 되는데, 이때 전로에서 2차정련을 실시하기 위한 운반 및 정련용기인 수강레이들로 용강을 출강하게 된다.Meanwhile, the molten steel that has undergone the refining process as described above undergoes a secondary refining process in order to satisfy the final quality specification. At this time, the molten steel is pulled out by means of a steel ladle, which is a transportation and refining container for performing secondary refining in the converter. Done.
용강을 전로에서 수강레이들로 출강하는 과정중에는 지구의 자전에 의해서 필수 불가결하게 용강의 와류현상(이하, "볼텍스"라고도 칭함)이 발생하게 된다.During the process of moving the molten steel from the converter to the taps, the vortex phenomena of the molten steel are indispensable due to the rotation of the earth.
이러한 볼텍스 현상에 의해 용강 상부의 비중이 작은 슬래그가 출강 작업시 출강구를 통하여 수강레이들로 유출하게 된다.Due to this vortex phenomenon, the slag having a small specific gravity in the upper part of the molten steel flows out through the tap hole during tapping operation.
특히, 출강말기에는 용강보다 비중이 낮은 액상의 슬래그가 비중이 높은 용강의 출강완료 싯점에 유출됨으로써 복린증가 및 개재물 증가로 품질불량의 현상이 발생된다.In particular, at the end of the tapping period, the liquid slag having a lower specific gravity than the molten steel flows out at the tapping completion point of the molten steel with a high specific gravity, resulting in poor quality due to an increase in double phosphorus and inclusions.
따라서, 이러한 품질불량을 방지하기 위하여 여러가지 방법 및 장치를 이용하여 슬래그 커팅(Cutting)을 해 오고 있다.Therefore, slag cutting has been performed using various methods and apparatuses to prevent such quality defects.
그러나, 액상에서의 슬래그 커팅에는 한계가 있어 수강 레이들 내로 슬래그의 유출을 저감 할수 있지만 고품질 저린강 생산에는 한계가 있다는 문제점이 있고, 또한 슬래그 커팅을 위해서는 별도의 장비와 자재가 투입됨으로써 원가를 상승시키는 문제점이 있다.However, slag cutting in the liquid phase has a limitation, which can reduce the outflow of slag into the steel ladle, but there is a limitation in producing high-quality low-lining steel.In addition, for slag cutting, the cost is increased by the additional equipment and materials. There is a problem.
본 발명자들은 상기한 종래기술의 제반 문제점을 해결하기 위하여 연구 및 실험을 행하고, 그 결과에 근거하여 본 발명을 제안하게 된 것으로서, 본 발명은 정련용으로 전로에 투입되는 부원료를 이용하여 액상의 슬래그를 고상으로 만들고 경화킴으로써 별도의 장비나 자재를 구비함이 없이 전로 출강 작업시 수강레이들로 슬래그가 유출되는 것을 방지할 수 있는 방법을 제공하고자 하는데, 그 목적이 있다.The present inventors have conducted research and experiments to solve the above-mentioned problems of the prior art, and based on the results, the present invention proposes the present invention, and the present invention uses liquid slag using subsidiary materials input to the converter for refining. The purpose of the present invention is to provide a method of preventing slag from leaking to the receiving ladles during the converter tapping work without preparing any additional equipment or materials by hardening and hardening the metal.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명은 전로 취련 종료후 탄소[C]를 투입하여 슬래그중의 산화철과 반응하게 하여 슬래그중의 저융점 슬래그를 고융점의 슬래그로 개질하는 단계;The present invention comprises the steps of reforming the low-melting slag in the slag to the slag of the slag by injecting carbon [C] after the completion of the converter blow to react with the iron oxide in the slag;
상기와 같이 개질된 슬래그에 경소 돌로마이트(주성분:MgO.CaO)를 첨가하여 전체의 슬래그를 하나의 고상체로 만드는 단계; 및 Adding slag dolomite (main component: MgO.CaO) to the slag modified as described above to make the whole slag into one solid body; And
불활성 가스를 취입하여 린싱(Rinsing)하는 단계를 포함하여 구성되는 전로 출강시 슬래그 혼입방지방법에 관한 것이다. The present invention relates to a method for preventing slag incorporation during the tapping of a converter including a step of blowing and rinsing an inert gas.
이하, 본 발명에 대하여 상세히 설명한다.EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.
본 발명에 따라 전로 출강시 슬래그 혼입을 방지하기 위해서는 전로 취련 종료후 탄소[C]를 투입하여 슬래그중의 산화철과 반응하게 하여 슬래그중의 저융점 슬래그를 고융점의 슬래그로 개질시켜야 한다. According to the present invention, in order to prevent the mixing of slag during the tapping of the converter, carbon [C] is added after the completion of the converter blow and reacts with iron oxide in the slag to reform the low melting slag in the slag into a slag of high melting point.
상기 슬래그의 조성은 일반적으로 중량%로, CaO: 40-50%, SiO2: 7-15%, MgO: 10-17%, 및 FeO: 15-30%를 함유하여 이루어진다.The composition of the slag is generally in weight percent, including CaO: 40-50%, SiO 2 : 7-15%, MgO: 10-17%, and FeO: 15-30%.
즉, 본 발명에서는 전로 취련 종료후 탄소[C]를 투입하여 슬래그중의 산화철과 반응하게 하여 철을 용강중으로 환원하게 하여 슬래그중의 저융점 슬래그를 고융점의 슬래그로 개질하는 것이 필요하다.That is, in the present invention, it is necessary to inject carbon [C] after the completion of the converter blow to react with the iron oxide in the slag to reduce the iron to molten steel so as to reform the low melting slag in the slag into the slag of the high melting point.
본 발명에 있어서 전로 취련 종료후 투입되는 탄소의 투입량은 1~3kg/T.s 로 설정하는 것이 바람직하다.In the present invention, it is preferable to set the amount of carbon introduced after completion of the converter blowdown to 1 to 3 kg / T.s.
상기 탄소로는 무연탄이 바람직하다.As said carbon, anthracite coal is preferable.
즉, 본 발명에서는 탄소(무연탄)를 1~3kg/T.s 투입하여 하기 반응식 (1)에서와 같이 생석회-산화철계 화합물에서 철을 환원시킴으로 고융점화 슬래그로 만들어 결정을 석출하여 슬래그를 고상화시키는 것이 바람직하다.That is, in the present invention, 1 to 3 kg / Ts of carbon (anthracite coal) is added to reduce the iron in the quicklime-iron oxide compound as shown in the following Reaction Formula (1) to make a high melting point slag to precipitate crystals to solidify the slag. desirable.
상기 탄소의 투입량이 1kg/T.s 미만의 영역에서는 산화철이 반응할 탄소량이 적어 목표하는 슬래그중의 산화철의 저감을 제어할 수 없어 고융점화 하기 어렵고, 3kg/T.s 를 초과하는 경우는 극심한 탄소와 산화철의 반응으로 인해 노구로 슬래그가 넘쳐 슬로핑을 유발할 수 있으므로, 상기 탄소의 투입량은 1~3kg/T.s로 설정하는 것이 바람직하다.In the region where the carbon input amount is less than 1 kg / Ts, the amount of carbon to be reacted with iron oxide is small, so that the reduction of the iron oxide in the target slag cannot be controlled, so that it is difficult to achieve high melting point, and when the carbon content exceeds 3 kg / Ts, the extreme carbon and iron oxide Since the slag overflows due to the reaction of the furnace may cause the slope, it is preferable to set the carbon input amount of 1 ~ 3kg / Ts.
다음에, 상기와 같이 개질된 슬래그에 경소 돌로마이트(주성분:MgO.CaO)를 첨가하 여 전체의 슬래그를 하나의 고상체로 만드는 것이 필요하다. Next, it is necessary to add light dolomite (main component: MgO.CaO) to the slag modified as mentioned above to make the whole slag into one solid body.
즉, 상기와 같이 개질된 슬래그에 경소 돌로마이트를 첨가하므로써 경소 돌로마이트 내의 산화 마그네슘을 이용하여 개질된 슬래그중의 산화 마그네슘을 과포화 상태로 만듦으로써 슬래그의 점성을 증가시키게 된다.That is, by adding light dolomite to the modified slag as described above, the viscosity of the slag is increased by making the magnesium oxide in the modified slag supersaturated using magnesium oxide in the light dolomite.
이러한 점성증가에 의하여 고융점화 된 슬래그가 서로간 부착되고 경화됨으로서 전체의 슬래그를 하나의 고상체로 만들게 되며, 결국 국부 영역의 저융점 슬래그도 개질되게 되는 것이다. As the viscosity increases, the high-melting slag is attached to each other and hardened, thereby making the whole slag into one solid body, and thus, the low-melting slag of the localized region is also modified.
본 발명에 있어서 투입되는 경소 돌로마이트의 투입량은 2~5kg/T.s로 설정하는 것이 바람직하다.It is preferable to set the input amount of light dolomite thrown in in this invention at 2-5 kg / T.s.
즉, 고상화된 슬래그에 경소 돌로마이트를 2~5kg/T.s을 첨가하여 슬래그 중에 생석회-산화마그네슘 분위기를 조성하여 슬래그 융점을 더욱 높이는 한편 슬래그의 점성을 강하게 하여 서로간의 응착으로 슬래그가 경화 하게 함으로 인해 전체 슬래그를 하나의 부정형 내화물화 하는 것이 바람직하다.That is, by adding 2 ~ 5kg / Ts of light-weight dolomite to solidified slag to create a quicklime-magnesium oxide atmosphere in the slag, the slag melting point is increased and the viscosity of the slag is strengthened so that the slag hardens by adhesion to each other. It is preferable to refractory of the entire slag to one amorphous form.
상기 경소 돌로마이트의 투입량이 2kg/T.s미만인 경우에는 슬래그의 점성이 떨어져 수강래이들 내로 일부 슬래그의 유출이 발생되고 5kg/T.s를 초과하는 경우에는 경소 돌로 마이트가 슬래그 중으로 일부 반응하고 용강계면과의 반응으로 인해 용강 온도를 하락하는 요인이 됨으로 상기 경소 돌로마이트의 투입량은 2~5kg/T.s설정하는 것이 바람직하다.When the input amount of the small dolomite is less than 2 kg / Ts, the slag viscosity decreases, and some slag flows out into the tap ladles. When the content of the small dolomite exceeds 5 kg / Ts, the small dolomite reacts partially in the slag and reacts with the molten steel interface. Due to this is a factor of lowering the molten steel temperature, the input amount of the small dolomite is preferably set to 2 ~ 5kg / Ts.
상기와 같이 경소 돌로마이트를 투입함으로써 슬래그 온도를 1600℃이하로 유지하 고, 경소 돌로마이트 내의 생석회(CaO)를 이용하여 국부영역조차도 CaO/SiO2를 1.5 이상으로 할 수 있다.As described above, by introducing small dolomite, the slag temperature can be maintained at 1600 ° C. or lower, and even CaO / SiO 2 can be made 1.5 or more even by using a quicklime (CaO) in the small dolomite.
다음에, 상기 부원료를 투입후 복합취련(전로 상부에는 산소를 취입하고 하부에는 불활성가스를 동시 취입)의 불활성가스로 바람직하게는 1분이상 린싱(Rinsing)하여 슬래그의 물성 변화시간을 확보함으로 슬래그가 고상 및 경화될 수 있도록 한다.Next, the slag is added to the slag by rinsing at least one minute with an inert gas of a composite blow (injecting oxygen in the upper part of the converter and simultaneously inert gas in the lower part) after adding the auxiliary raw material. To be solid and curable.
상기 불활성가스로는 N2또는 Ar등을 들 수 있다.Examples of the inert gas include N 2 or Ar.
상기 린싱을 1분 미만으로 실시하는 경우에는 투입한 탄소가 산화철과 미쳐 반응하지 못하고 있다가 출강시 넘쳐 슬래그가 노구로 유출되어 수강레이들 응착이 발생될 우려가 있으므로, 린싱 시간은 1분이상으로 설정하는 것이 바람직하다.If the rinsing is performed in less than 1 minute, the injected carbon may not react with the iron oxide so much that the slag may flow out of the furnace, resulting in the ladle adhesion. It is preferable to set.
상기와 같이 린싱하므로써 전체 슬래그의 물성 변화를 촉진할 수 있다.By rinsing as described above, changes in physical properties of the whole slag can be promoted.
본 발명에 따라 처리된 슬래그는 중량%로, CaO: 40-50%, SiO2: 7-15%, MgO: 5-15%, 및 FeO: 10%이하를 함유하는 슬래그가 되도록 공정을 제어하는 것이 바람직하다.The slag treated according to the present invention is controlled by weight to be slag containing 40-50% of CaO, 7-15% of SiO 2 , 5-15% of MgO, and 10% of FeO. It is preferable.
본 발명에 있어서 슬래그의 고상화는 크게 두가지의 영향으로 고려될 수 있다. In the present invention, the solidification of slag can be considered largely by two effects.
첫째는 카본이 슬래그의 산화철을 환원시킴으로써 슬래그의 융점 상승시킴에 의한 고상화를 들 수 있고, 둘째는 상온의 경소 돌로마이트의 냉각효과로 슬래그의 부분적인 고상화를 들 수 있다.First, the solidification by raising the slag melting point of carbon by reducing the iron oxide of the slag, and secondly, the partial solidification of the slag due to the cooling effect of mild dolomite at room temperature.
이하, 실시예를 통하여 본 발명을 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
(실시예)(Example)
100ton전로를 이용하여 중량%, C: 0.04%, Si: 0.04%, Mn: 0.30%, P: 0.0025%, 및 S: 0.0025%를 포함하는 용강을 취련하여 출강시 온도를 1600℃이하로 취지하여 출강하는 알루미늄(Al:탈산재) 투입 및 캐치카본 용강에 있어서 출강시 탄소 2kg/T.S와 경소 돌로마이트를 4Kg/T.S를 동시에 투입하고 2분간 린싱한 다음, 알루미늄 투입량, 슬래그 유출량, 소강중 인의 함량, 슬래그중 산화철 함량 및 산화마그네슘 함량 및 생석회/산화규소의 비를 구하고, 그 결과(발명예)를 종래방법의 것(종래예)과 함께 하기 표 1에 나타내었다.By using a 100ton converter, a molten steel including a weight%, C: 0.04%, Si: 0.04%, Mn: 0.30%, P: 0.0025%, and S: 0.0025% was blown, and the temperature during tapping was not higher than 1600 ° C. In case of entering aluminum (Al: deoxidizer) and catch carbon molten steel, 2kg / TS of carbon and 4kg / TS of light dolomite are added at the same time and rinsed for 2 minutes, followed by aluminum input, slag outflow, phosphorus content in steel, The iron oxide content, magnesium oxide content, and quicklime / silicon oxide ratio in the slag were obtained, and the results (invention example) are shown in Table 1 together with the conventional method (conventional example).
또한, 레이들 슬래그 양에 따른 전로 슬래그 유출량 변화를 조사하고, 그 결과를 도 1에 나타내고, 또한, 출강횟수에 따른 슬래그 유출량을 조사하고, 그 결과를 도 2에 나타내었다.In addition, the change in converter slag flow rate according to the ladle slag amount was investigated, and the result is shown in FIG. 1, and the slag flow rate according to the number of tapping times was investigated, and the result is shown in FIG. 2.
하기 표 1의 발명예 및 종래예의 결과를 얻기 위하여 동일 강종에서 각각 50CH(챠지)씩 실험하였다.In order to obtain the results of the invention example and the conventional example of Table 1, 50CH (charge) in each of the same steel was tested.
하기 표1 및 도 1및 도 2에 나타난 바와 같이, 본 발명에 따르는 경우(발명예)에는 종래방법(종래예)의 경우에 비하여 슬래그 유출량이 적음을 알 수 있다.As shown in Table 1 and Figures 1 and 2, it can be seen that in the case of the present invention (invention example), the slag outflow amount is smaller than that of the conventional method (conventional example).
또한, 본 발명예의 경우에는 슬래그가 출강중 고상의 상태를 유지하며, 볼텍스 현상이 종래예에 비하여 현저히 감소하였다.In addition, in the case of the present invention, the slag maintains the solid state during tapping, and the vortex phenomenon is significantly reduced compared with the conventional example.
상술한 바와 같이, 본 발명은 취련 종료후 슬래그를 고융점화 및 경화함으로써, 출강시 슬래그의 볼텍스 현상 및 유출을 별도의 장비와 자재가 없이 제어함으로 인하여 수강레이들내 슬래그의 유출을 감소하여 복린 방지 및 개재물감소로 인하여 품질을 향상시킬 수 있는 효과가 있는 것이다.As described above, the present invention by the high melting point and hardening of the slag after the end of the blow, by controlling the vortex phenomenon and outflow of the slag during the tapping without the equipment and materials to reduce the outflow of the slag in the water ladle, Due to the prevention and reduction of inclusions there is an effect that can improve the quality.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5562109A (en) * | 1978-10-28 | 1980-05-10 | Ibiden Co Ltd | Desulfurizing method for molten pig iron |
| JPS5811717A (en) * | 1981-07-15 | 1983-01-22 | Nippon Steel Corp | Formation of protecting layer for gas blowing hole by porous slag coating |
| JPS6379910A (en) * | 1986-09-24 | 1988-04-09 | Kawasaki Steel Corp | Prevention of slag mixing into tapping steel flow |
| KR19990012917A (en) * | 1997-07-31 | 1999-02-25 | 김종진 | Converter reinforcement using LDS converter slag |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5562109A (en) * | 1978-10-28 | 1980-05-10 | Ibiden Co Ltd | Desulfurizing method for molten pig iron |
| JPS5811717A (en) * | 1981-07-15 | 1983-01-22 | Nippon Steel Corp | Formation of protecting layer for gas blowing hole by porous slag coating |
| JPS6379910A (en) * | 1986-09-24 | 1988-04-09 | Kawasaki Steel Corp | Prevention of slag mixing into tapping steel flow |
| KR19990012917A (en) * | 1997-07-31 | 1999-02-25 | 김종진 | Converter reinforcement using LDS converter slag |
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