KR900004283B1 - Making process for flux of steel refining - Google Patents
Making process for flux of steel refining Download PDFInfo
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- KR900004283B1 KR900004283B1 KR1019870009720A KR870009720A KR900004283B1 KR 900004283 B1 KR900004283 B1 KR 900004283B1 KR 1019870009720 A KR1019870009720 A KR 1019870009720A KR 870009720 A KR870009720 A KR 870009720A KR 900004283 B1 KR900004283 B1 KR 900004283B1
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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
- 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
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Abstract
Description
도면은 CaO-SiO2-A12O3의 3원 상태도.The figure shows a ternary state diagram of CaO-SiO 2 -A1 2 O 3 .
본 발명은 전로에서 정련된 용강의 후처리 공정에서 사용되는 정련용 용제(Flux)의 제조법에 관한 것이다.The present invention relates to a method for producing a refining solvent (Flux) used in the aftertreatment process of molten steel refined in a converter.
고급강의 수요가 점차 증가하고 수요가의 품질요구가 엄격해짐에 따라 Al2O3나 SiO2, MnO등 비금속 개재물이 적은 청정강의 제조에 대한 필요성이 증가하여 래들(Ladle)이나 RH-용기등에서 용강을 교반하여 비금속 개재물을 부상분리시키는 청정화처리가 실시되고 있다. 그러나, 비금속 개재물이 부상된다 할지라도 용강상부의 슬레그(Slag)나 용제가 개재물 포집능이 작을 경우에는 상기 청정화 처리의 효과가 적게되며 용강과 함께 불가피하게 래들로 유입되는 전로슬래그는 철 및 망간 산화물의 농도가 높기 때문에 주조전의 체류기간중 이들 산화물이 용강중에 투입된 합금철 및 탈산반응후 잔류하는 Al나 Si등의 탈산제와 반응하여 용강을 다시 오염시키게 된다.As the demand for high grade steel gradually increases and the demand for quality is strict, the necessity for the manufacture of clean steel with less non-metallic inclusions such as Al 2 O 3 , SiO 2 and MnO increases, so that molten steel in ladles or RH containers The cleaning process is carried out to stir and separate the nonmetallic inclusions by stirring. However, even if the non-metallic inclusions are injured, when the slag or solvent in the molten steel has small inclusion capturing ability, the effect of the cleansing treatment is less. Due to the high concentration of, these oxides contaminate molten steel again by reacting with ferroalloy introduced into molten steel and deoxidizers such as Al or Si remaining after deoxidation.
따라서 래들에서 전로슬래그를 제거한 후 또는 전로슬래그자체를 개질하기 위해 합성슬래그를 투입하는 방법이 실시되고 있는데, 합성용제로서는 CaO, SiO2, A12O3가 주요구성 성분으로 되어 있고 이들 원소의 3원 상태도(첨부도면)에서 I,II영역의 조성비가 개재물 포집능이 우수한것으로 알려져 있다. 그러나 합성용제를 제조하는 종래의 방법은 원료의 건조, 분쇄, 혼합, 괴상화 소성 및 냉각등으로 구성되는 복잡한 제조공정으로 되어 있을 뿐 아니라, 이로인해 제조비용이 큰 결점이 있다. 또한 합성용제의 재화반응(滓化反應)을 촉진할 경우에는 상기의 성분외에 CaF2, Na2O등의 저융점 화합물을 첨가하게 되는데, 이와같은 첨가물은 용강처리 용기의 내화물의 용손을 촉진하게 되는 결점을 가지게 된다.Therefore, after removing the converter slag from the ladle or modifying the converter slag itself, a method of adding a synthetic slag is carried out. As a synthetic solvent, CaO, SiO 2 , A1 2 O 3 are the main constituents, and 3 It is known that the composition ratio of the I and II regions in the original state diagram (attached drawing) is excellent in the inclusion trapping ability. However, the conventional method for preparing a synthetic solvent not only has a complicated manufacturing process consisting of drying, grinding, mixing, bulking and cooling raw materials, but also has a drawback in that the manufacturing cost is high. In addition, in order to promote the regeneration reaction of the synthetic solvent, low melting point compounds such as CaF 2 and Na 2 O are added in addition to the above components. Such additives promote the melting of refractories in the molten steel container. Has the disadvantage of becoming.
본 발명은 이상과 같은 실정을 감안하여 저융점 화합물의 첨가없이도 재화속도가 우수할 뿐더러 경제적인 용제의 신규한 제조법을 제공하는 것을 목적으로 창안된 것이다.In view of the above circumstances, the present invention was devised for the purpose of providing a novel manufacturing method of a solvent which is excellent in goods rate and economical without addition of a low melting point compound.
본 발명이 제조대상으로 하는 용제는 CaO, SiO2, A12O3를 기본성분으로 하고 함유량이 각각 50-70중량%, 15중량% 이하 및 20-40중량%인 3원 상태도상의 II영역의 조성비로 된 것이다. 또한 본 발명은 전로에서 발생하는 슬레그를 제조원료로 사용하는 것을 발명의 기본요건으로 하며 그 특징은 다음과 같다.Solvents to be manufactured in the present invention are based on CaO, SiO 2 , A1 2 O 3 , and the content is 50-70% by weight, 15% by weight or less and 20-40% by weight of the II region in the three-state state diagram. It is a composition ratio. In addition, the present invention is to use the slag generated in the converter as a manufacturing raw material as a basic requirement of the invention and its features are as follows.
본 발명은 전로에서 래들로 용강을 출강할 때에 용강탈산용 Al을 출강초기에 래들에 투입하고 CaO를 출강중기에 투입하며 래들에의 전로슬래그의 유입량을 10Kg/T-S 이하로 하여 출강을 종료한 후에 Al을 용강상부의 전로슬래그에 투입하고 불활성가스를 용강에 취입하여 수분간(數分間)용강을 교반한 후, 슬래그를 용강과 분리하여 공냉시키는 것을 특징으로 한다. 위에서 'T-S'란 용강 1톤을 기준으로 함을 의미한다. 정로슬래그의 조성은 제철소에 따라 약간의 차이는 있으나 본 발명의 실시에 사용된 슬래그를 예로들면 CaO ; 43.80%, SiO2; 15.90%, A12O3; 3.30%, P2O3; 1.73%, TiO2: 0.99%, MgO : 6.30%, MnO : 4.40%, T.Fe : 17.40%, 기타 : 3.10%로 되어있다.In the present invention, when the molten steel is tapped into the ladle in the converter, the molten steel deoxidation Al is added to the ladle at the beginning of the tapping and the CaO is placed in the tapping period, and after the tapping is finished with the inflow rate of the converter slag into the ladle being 10 Kg / TS or less. Al is introduced into the converter slag in the upper part of the molten steel, inert gas is blown into the molten steel, the molten steel is stirred for several minutes, and the slag is separated from the molten steel for air cooling. 'T-S' above is based on 1 ton of molten steel. The composition of the furnace slag is slightly different depending on the steel mill, but examples of the slag used in the practice of the present invention include CaO; 43.80%, SiO 2 ; 15.90%, A 1 2 O 3 ; 3.30%, P 2 O 3 ; 1.73%, TiO 2 : 0.99%, MgO: 6.30%, MnO: 4.40%, T.Fe: 17.40%, Others: 3.10%.
여기에서 조성비는 중량비이며 T.Fe는 산화철(FexOy)에서 Fe함유량만을 나타낸것으로 이하 동일하다. 상기한 바처럼 전로슬래그에는 CaO 및 SiO2가 다량으로 함유되어있음으로 성분조정에 의해 본 발명이 목표로 하는 용제의 제조원료로 사용할 가능성이 있다. 그러나 전로슬래그중의 P2O5는 복린작용으로 강중 [P]증가의 요인이 되는 문제점이 있다. 또한 제조열원으로 용강의 현열을 이용하는 본 발명에 있어서는 래들에 유입되는 슬래그의 량이 증가할수록 전로슬래그의 성분조정에 필요한 CaO의 투입량이 증가하여 용강의 온도저하가 크게되는 문제가 있다. 따라서 래들에 유입되는 전로슬래그의 량을 10Kg/T-S 이하로 할 필요가 있다.Here, the composition ratio is weight ratio, and T.Fe is only Fe content in iron oxide (Fe x O y ), which is the same below. As mentioned above, since the converter slag contains a large amount of CaO and SiO 2 , it may be used as a raw material for the preparation of the solvent targeted by the present invention by adjusting the composition. However, P 2 O 5 in the converter slag has a problem of causing a factor [P] increase due to the abdominal action. In addition, in the present invention using the sensible heat of molten steel as the heat source for manufacturing, as the amount of slag flowing into the ladle increases, the amount of CaO required to adjust the composition of the converter slag increases, resulting in a large temperature drop in the molten steel. Therefore, the amount of converter slag flowing into the ladle needs to be 10 Kg / TS or less.
또한 전로슬래그에는 FexOy및 MnO가 20%이상 함유되어 있는데, 이들 산화물이 용강중의 A1과 반응하여 생성되는 Al2O3는 강의 개재룰 증가에 대한 가장 큰 요인으로 작용되고 있다. 따라서 본 발명은 FexOy및 MnO로 인해 기인되는 해를 제거하기 위해서 출강종료후에 Al을 투입하며 투입된 Al는 FexOy및 MnO와 반응하여 이들 산화물을 극소화시키게 된다. 이때 첨가량은 전로슬래그 10Kg에 대하여 0.4-0.5Kg이면 충분하다. 한편, 출강초기 용강탈산용으로 첨가된 Al는 탈산반응에 의해서 Al1O 생성하여 본 발명의 용제제조에 필요한 Al2O3의 공급원으로 작용하게 된다.In addition, the converter slag contains more than 20% of Fe x O y and MnO. Al 2 O 3 generated by reacting these oxides with A1 in molten steel serves as the biggest factor for increasing the interposition of steel. Therefore, in the present invention, Al is added after finishing the tapping to remove the harm caused by Fe x O y and MnO, and the added Al reacts with Fe x O y and MnO to minimize these oxides. In this case, the amount of addition is preferably 0.4-0.5Kg based on 10Kg of converter slag. Meanwhile, Al added for initial molten steel deoxidation generates Al 1 O by the deoxidation reaction, and serves as a source of Al 2 O 3 necessary for preparing a solvent of the present invention.
따라서, 본 발명에 의한 용제제조에 있어서는 Al2O3을 별도로 공급할 필요가 없게되는 효과가 있게 된다. 이때 Al의 첨가량은 전로취련종료후의 용강내의 산소량에 따라 조절하고 용제의 목료조성을 감안하여 1.5-2.5Kg/T-S 첨가한다.Therefore, in the solvent production according to the present invention, there is an effect that it is not necessary to supply Al 2 O 3 separately. At this time, the amount of Al is adjusted according to the amount of oxygen in the molten steel after the completion of converter conversion, and 1.5-2.5Kg / TS is added in consideration of the composition of the solvent.
또한, CaO는 성분조정용으로 7-10Kg/T-S 투입하며 재화를 촉진하기 위해 출강중기에 투입하는 것이 바람직하다. 한편, 투입된 CaO나 탈산생성물인 Al2O3는 융점이 용강온도에 비하여 매우 높기때문에 이들의 재화를 촉진하기 위해서 전로슬래그와의 균일한 혼합이 필요하다. 이를 위해 불활성가스를 용강에 취입하는데, 3분이상 취입작업을 실시하는 것이 바람직하다.In addition, CaO is added to 7-10Kg / TS for the adjustment of ingredients, it is preferable to add during the tapping to promote goods. On the other hand, since the melting point of Ca 2 O 2 and Al 2 O 3, which is a deoxidation product, is very high compared to the molten steel temperature, uniform mixing with converter slag is necessary to promote their goods. To this end, inert gas is blown into the molten steel, and it is preferable to carry out the blowing operation for at least 3 minutes.
불활성가스의 취입에 의해서 조성이 균일하게 형성된 슬래그를 용강과 분리하여 공냉을 하고 냉각된 슬래그를 사용목적에 따라 분말상 또는 괴상으로하여 용강전력용 용제로 사용하게 된다.The slag having a uniform composition by blowing inert gas is separated from molten steel and air-cooled, and the cooled slag is used as a molten steel solvent by powder or mass according to the purpose of use.
본 발명에 따른 용제의 조성에 관하여 일례를 들면, CaO ; 52.6%, SiO2; 6.30%, Al2O3; 33.16%, P2P50.05%, TiO2; 0.20%, MgO ; 4.10%, MnO ; 0.16%, T.Fe ; 0.61%, 기타 ; 2.75%이다.Examples of the composition of the solvent according to the present invention include CaO; 52.6%, SiO 2 ; 6.30%, Al 2 O 3 ; 33.16%, P 2 P 5 0.05%, TiO 2 ; 0.20%, MgO; 4.10%, MnO; 0.16%, T. Fe; 0.61%, other; 2.75%.
저탄소 알루미늄 킬드강 320톤을 전로에서 출강할 때에 상기한 조성의 용제를 래들에 1톤 투입하고 RH정련처리를 실시한 후, 주편내의 총산소량 및 개재물을 분석한 결과, 산소량은 14.3ppm, 개재물은 강 10Kg당 0.224mmg인 고청정강이 제조됨을 알 수 있었다.When 320 tons of low carbon aluminum-kilted steel was pulled out of the converter, 1 ton of the solvent of the above composition was added to the ladle and subjected to RH refining treatment. The total oxygen content and inclusions in the cast steel were analyzed, and the oxygen content was 14.3 ppm, and the inclusions were steel. It was found that a high clean steel of 0.224 mmg per 10 kg was produced.
이상과 같이 본 발명에 따르는 용제는 구성성분들이 기재화를 이룬 상태이므로 구성성분이 단순히 혼합되어 있는 종래의 용제에 비하여 용강상부에 첨가시 신속히 용해되고 이로 인해 개재물 포집효과가 더욱 우수하게 된다.As described above, since the solvent according to the present invention is in a state in which the components are formed, the solvent dissolves quickly when added to the upper portion of the molten steel as compared with the conventional solvent in which the components are simply mixed, and thus the inclusion trapping effect is more excellent.
또한 기재화된 상태의 용재를 제조하기 위해서 종래에는 용융설비 및 에너지를 요하게 되나 본 발명은 전로슬래그 및 용강의 현열을 이용하게 됨으로 용제제조용 전용설비 및 에너지가 불필요한 효과가 있다.In addition, in order to manufacture the solvent in the state described in the prior art melting equipment and energy is required, but the present invention uses the converter slag and the sensible heat of molten steel, there is an effect that unnecessary equipment and energy for solvent manufacturing unnecessary.
그리고, 제조원료에 있어서는 제강공정에서 부생되는 것을 활용할 수 있게되어 신규원료로서 CaO만이 소량소요됨으로 제조원료의 원단위가 적게되는 잇점이 있다.In addition, in the manufacturing raw material, by-products produced in the steelmaking process can be utilized, and only a small amount of CaO is required as a new raw material, thereby reducing the raw unit of the manufacturing raw material.
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| KR1019870009720A KR900004283B1 (en) | 1987-09-02 | 1987-09-02 | Making process for flux of steel refining |
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| KR1019870009720A KR900004283B1 (en) | 1987-09-02 | 1987-09-02 | Making process for flux of steel refining |
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| KR900004283B1 true KR900004283B1 (en) | 1990-06-20 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR101388064B1 (en) * | 2012-06-28 | 2014-04-25 | 현대제철 주식회사 | Flux for manufacturing of ultra low carbon steel |
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| KR101388064B1 (en) * | 2012-06-28 | 2014-04-25 | 현대제철 주식회사 | Flux for manufacturing of ultra low carbon steel |
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