KR100328030B1 - A Method of Preventing Slopping Phenomena in Refinement of High Silicon Steel melts - Google Patents
A Method of Preventing Slopping Phenomena in Refinement of High Silicon Steel melts Download PDFInfo
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- KR100328030B1 KR100328030B1 KR1019970045922A KR19970045922A KR100328030B1 KR 100328030 B1 KR100328030 B1 KR 100328030B1 KR 1019970045922 A KR1019970045922 A KR 1019970045922A KR 19970045922 A KR19970045922 A KR 19970045922A KR 100328030 B1 KR100328030 B1 KR 100328030B1
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- molten steel
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- slag
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 229910000976 Electrical steel Inorganic materials 0.000 title claims abstract description 5
- 239000000161 steel melt Substances 0.000 title 1
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000007664 blowing Methods 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 18
- 239000010703 silicon Substances 0.000 claims abstract description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000007789 gas Substances 0.000 claims abstract description 15
- 238000007670 refining Methods 0.000 claims abstract description 13
- 239000002131 composite material Substances 0.000 claims abstract description 11
- 239000011261 inert gas Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000001877 deodorizing effect Effects 0.000 claims description 2
- 238000004332 deodorization Methods 0.000 abstract description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 44
- 239000002893 slag Substances 0.000 description 28
- 229910052742 iron Inorganic materials 0.000 description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 238000003912 environmental pollution Methods 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000005261 decarburization Methods 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 235000012255 calcium oxide Nutrition 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 239000000839 emulsion Substances 0.000 description 2
- 239000006260 foam Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- FRXSZNDVFUDTIR-UHFFFAOYSA-N 6-methoxy-1,2,3,4-tetrahydroquinoline Chemical compound N1CCCC2=CC(OC)=CC=C21 FRXSZNDVFUDTIR-UHFFFAOYSA-N 0.000 description 1
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000008034 disappearance Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
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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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
-
- 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
- F27D21/00—Arrangement of monitoring devices; Arrangement of safety devices
- F27D2021/0057—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects
- F27D2021/0085—Security or safety devices, e.g. for protection against heat, noise, pollution or too much duress; Ergonomic aspects against molten metal, e.g. leakage or splashes
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
본 발명은 용강의 정련방법에 관한 것이며; 그 목적은 복합취련전로에서의 고규소함유용강을 정련조업시 슬로핑(slopping)현상을 방지함에 그 목적이 있다.The present invention relates to a method for refining molten steel; Its purpose is to prevent the sloping phenomenon in the refining operation of high-silicon-containing molten steel in the composite blower converter.
상기 목적달성을 위한 본 발명은 하부에 다수개의 가스노즐을 구비한 복합취련전로를 이용하여 규소함량이 0.5%이상인 용강을 취련하여 정련하는 방법에 있어서, 상기 취련조업시 상취와 하취를 동시에 실시하고; 상기 상취는 (상취랜스의 하단부와 용강의 탕면사이 설정거리)±200mm 범위내에서 상취랜스를 상하왕복이동하면서 행하고; 그리고 하취는 서로 이웃하는 하부노즐로에서부터 불활성가스를 교대로 취입하여 행하여 구성되는 고규소용강의 슬로핑방지방법에 관한 것을 그 기술적 요지로 한다.The present invention for achieving the above object is a method of blowing and refining molten steel having a silicon content of 0.5% or more by using a composite blower having a plurality of gas nozzles at the bottom, at the same time performing the up and down take and; The uptake is performed by moving the up and down reciprocating up and down within the range of (the set distance between the lower end of the uptake lance and the tap surface of molten steel) ± 200mm; In addition, deodorization is a technical gist of an anti-sloping method of molten silicon steel, which is formed by alternately blowing inert gas from adjacent lower nozzle furnaces.
Description
본 발명은 용강의 정련방법에 관한 것으로서, 보다 상세하게는 복합취련전로에서 고규소함유용강을 정련조업할 시 슬로핑(slopping)현상을 방지하는 방법에 관한 것이다.The present invention relates to a method for refining molten steel, and more particularly, to a method of preventing a slipping phenomenon when refining a high silicon-containing molten steel in a composite refining converter.
일반적으로 전로에서 취련시 용선중 규소는 산소와 반응이 가장 먼저 일어나는 원소이며, 특히 이 산화반응의 발열량은 취련중 용선의 승온에 중요한 열원으로 사용되는 것으로 알려져 있다. 보통 전로취련초기 3분이내에 용선중 규소는 거의 전량 산화되며, 이때 생성되는 (SiO2)는 투입된 생석회(CaO)를 재화시키고 슬래그를 형성한다. 또한, 통상의 전로정련조업시 상취랜스를 통해 고속으로 취입되는 산소제트 (jet)는 용선표면에 캐비티(cavity)를 형성하고 주변에 수많은 철립을 비산시키며, 이에 따라 슬래그내에는 많은 양의 철립이 혼입되어 슬래그와 반응하면서 강욕으로 되돌아 간다. 이러한 슬래그내 반응영역을 에멀젼(emulsion)이라 하며, 300톤 전로의 경우 약 3톤이상의 철립을 포함하고 있다. 상기 철립자와 슬래그중의 산화물이 반응하면서 CO기포가 발생하고, 이 기포는 극히 미세하여 슬래그의 상층부로 이동하면서 폼(foam)을 형성한다. 취련중 슬래그의 높이, 즉 폼의 높이는 에멀젼내의 CO기포의 생성속도와 슬래그 표면에서의 기포의 소멸속도의 균형에 의하여 일정하게 유지되지만, 그 균형이 깨지면 슬래그의 높이가 급격히 상승되어 전로의 노구로 넘쳐 흐르게 되는데, 이를 슬로핑(slopping)이라 한다.In general, silicon in molten iron during the blowing in the converter is the first element that reacts with oxygen, and in particular, the calorific value of this oxidation reaction is known to be used as an important heat source for raising the temperature of the molten iron during the blowing. Usually, within three minutes of the initial conversion of the converter, almost all of the silicon in the molten iron is oxidized, and (SiO 2 ) is produced to regenerate the injected quicklime (CaO) and form slag. In addition, the oxygen jet blown at high speed through the upper lance in the converter refining operation forms a cavity on the surface of the molten iron and scatters numerous iron grains around the slag. Incorporates and reacts with slag, returning to libido. The reaction zone in the slag is called an emulsion, and in the case of a 300 ton converter, it contains about 3 tons of iron grains. As the iron particles react with the oxides in the slag, CO bubbles are generated, and the bubbles are extremely fine to move to the upper layer of the slag to form a foam. The slag height during foaming, that is, the foam height, is kept constant by the balance between the rate of formation of CO bubbles in the emulsion and the rate of disappearance of bubbles on the surface of the slag.However, if the balance is broken, the slag height rises rapidly to the furnace furnace. It overflows, which is called slopping.
이러한 전로조업에서 슬로핑현상은 그 발생기구에 따라 2가지로 분류될 수 있다. 하나는 약취(soft blowing)등으로 슬래그중의 FeO농도가 높을 경우 슬래그내에서 급격한 탈탄반응으로 과다한 포밍(foaming)이 발생하여 슬로핑이 일어나는 것이다. 또 다른 하나는 노내온도가 비교적 낮은 취련초기부터 냉각제인 소결광을 투입하면 슬래그의 온도가 저하되어 2CaO·SiO2등의 석출로 슬래그의 표면점도가 급격히 상승하여 노구에 넘치게 되어 일어난다. 그러나, 전로 실조업에서는 상기 2가지 요인이 복합적으로 작용하여 슬로핑이 발생하며, 특히 용선중 규소성분이 높거나 노체 코팅을 위한 잔류슬래그량이 많을 경우 취련초기부터 다량의 액상 슬래그와 배가스가 형성되어 배가스의 배출이 용이하지 않을 경우 과다한 포밍이 발생하여 슬래그와 용강이 노구로 흘러넘쳐 슬로핑이 발생한다. 더욱이 용선중에 규소가 다량 함유되어 있으면 취련중 슬래그부피를 증가시켜 탈탄, 탈린, 및 탈망간과 같은산화반응에 악영향을 끼치며, 특히 취련초기에 배가스가 급격히 생성되어 노내에 정체하였다가 포화상태에 이르면 이 배가스가 일시에 노구로 배출될 경우 대형 슬로핑이 발생된다. 취련중 슬로핑(slopping)이 발생하면 환경공해 유발은 물론 열균형에도 큰 영향을 주어 취련 적중율이 저하되고, 분출에 의한 실수율 저하로 생산성 및 경제성이 떨어진다.In this converter operation, the sloping phenomenon can be classified into two types according to the generating mechanism. One is the soft blowing, so that when the FeO concentration in the slag is high, excessive foaming occurs due to the rapid decarburization in the slag, which causes the slope. On the other hand, when the sintered ore, which is a coolant, is introduced from the beginning of the low temperature of the furnace, the slag temperature is lowered, and the surface viscosity of the slag rapidly rises due to precipitation of 2CaO · SiO 2 , resulting in overflowing the furnace. However, in the converter industry, the above two factors act in combination to cause slinging, especially when molten iron has a high silicon content or a large amount of residual slag for the coating of the furnace, a large amount of liquid slag and flue gas are formed from the beginning of the blow job. If the exhaust gas is not easily discharged, excessive foaming occurs, causing slag and molten steel to flow into the furnace, causing slopes. Furthermore, the large amount of silicon in the molten iron increases the slag volume during the blowing, which adversely affects the oxidation reactions such as decarburization, thallin, and demanganese.In particular, when the flue gas is rapidly formed in the early stage of the blowing and stagnates, Large fluctuations occur when the flue-gas is released to the furnace at once. Slopping occurs during the blow, which causes not only environmental pollution but also a great effect on thermal balance, which lowers the blow hit rate, and lowers the productivity rate and economics due to the drop of the blow rate.
한편, 용선중 규소성분이 0.5%이상으로 다량함유된 용선의 취련조업시 슬로핑발생을 방지하고자 종래에는 하부에 다수개의 노즐이 구비된 복합취련전로를 사용하여 용선의 장입량을 기준 대비 차지(charge)당 20톤 정도를 줄여 경장입하고, 슬래그코팅을 실시하지 않는 방법을 주로 적용하였다. 그러나, 용선의 경장입은 오히려 생산성을 저하시키고, 또한 슬래그 코팅을 미실시하는 방법은 부원료 투입량 증가 및 노체수명을 단축시키는 문제가 있다.On the other hand, in order to prevent slipping in the molten iron operation of molten iron containing a large amount of silicon component of more than 0.5% in the molten iron conventionally occupy the amount of the molten iron by using a composite blower having a plurality of nozzles at the bottom ( The main method was to reduce the load by 20 tons per charge) and do not perform slag coating. However, the light loading of the molten iron rather decreases the productivity, and the method of not performing the slag coating has a problem of increasing the input amount of secondary raw materials and shortening the life of the furnace.
따라서, 본 발명은 Si함량이 0.5%이상인 고규소용강의 전로정련시 복합취련전로에서 상취와 하취조업을 동시에 적절히 제어하므로써 환경공해방지뿐만아니라 노체수명 및 생산성을 향상시킬 수 있는 슬로핑방지방법을 제공함에 그 목적이 있다.Therefore, the present invention provides an anti-slope prevention method that can improve not only environmental pollution but also the life and productivity of the furnace by appropriately controlling the uptake and the undertake operation at the same time during the converter refining of high silicon molten steel having a Si content of 0.5% or more. The purpose is to provide.
도1은 일반적인 복합취련전로에서의 취련시간대별 슬로핑발생율과의 관계를 나타내는 그래프1 is a graph showing the relationship between the incidence of slopes by blowing time in a general composite blowing converter
상기 목적달성을 위한 본 발명은 하부에 다수개의 가스노즐을 구비한 복합취련전로를 이용하여 규소함량이 0.5%이상인 용강을 취련하여 정련하는 방법에 있어서,In the present invention for achieving the above object in the method for blowing and refining molten steel having a silicon content of 0.5% or more using a composite blower having a plurality of gas nozzles at the bottom,
상기 취련조업시 상취와 하취를 동시에 실시하고; 상기 상취는 상취랜스를 (상취랜스의 하단부와 용강의 탕면사이 설정거리)±200mm 범위내에서 상하왕복이동하면서 행하고; 그리고 하취는 서로 이웃하는 하부노즐로에서부터 불활성가스를 교대로 취입하여 행하여 구성되는 고규소용강의 슬로핑방지방법에 관한 것이다.At the same time performing the blowing and deodorizing in the blowing operation; The up and down reciprocating is performed while the upper and lower reciprocating (setting distance between the lower end of the upper lance and the hot water surface of the molten steel) ± 200mm; In addition, deodorization relates to a method of preventing slipping of molten silicon steel, which is formed by alternately blowing inert gas from adjacent lower nozzles.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
우선, 본 발명은 극저탄소용강이든 전기강판용 용강이든 고규소함유 용강이든 관계없이 고규소함유 용강이면 어떤 용강이든지 관계없이 적용가능하다. 특히, 본 발명은 대형 슬로핑이 발생하기 쉬운 규소함량이 0.5%이상인 용강에 적합하며, 보다 바람직하게는 규소함량이 0.5~2.1%인 용강이면 더욱 적합하다.First of all, the present invention is applicable to any molten steel as long as it is a high silicon-containing molten steel regardless of whether it is an ultra-low carbon molten steel, an electrical steel sheet molten steel, or a high silicon-containing molten steel. In particular, the present invention is suitable for molten steel having a silicon content of 0.5% or more, which is likely to cause large slopes, and more preferably, molten steel having a silicon content of 0.5 to 2.1%.
또 본 발명에서는 슬로핑의 방지를 위해서 하부에 다수개의 가스노즐을 구비한 복합취련전로를 이용한다. 보통 복합취련전로는 상부로부터 산소를 취입하는 랜스와 하부에 다수개의 노즐이 구비되어 있어 취련조업시 상취와 하취를 동시에 실시할 수 있는 전로로서, 본 발명의 경우 상취와 하취가 동시에 진행될 수 있는 복합취련전로이면 어떠한 형태의 전로이든 무방하다.In addition, in the present invention, a composite blower having a plurality of gas nozzles in the lower portion is used to prevent slipping. In general, the composite smelting converter is provided with a plurality of nozzles in the lance and the lower part to inject oxygen from the upper side, and the converter can perform both the up and down in the case of the blowing operation. Any type of converter may be used for the combined blower converter.
복합취련전로에서 취련조업시 상취랜스의 하단부와 용선의 탕면사이의 거리는 용선의 장입량에 따라 결정된다. 보통 상취랜스의 하단부와 용선의 탕면사이의 설정거리는 약 2100~2700mm정도이다. 본 발명에 의한 상취는 랜스를 그 랜스의 하단부와 용강의 탕면사이 설정거리±200mm 범위내에서 상하왕복이동하여 실시한다. 예를들면, 상취랜스를 통한 취련시 상취랜스의 하단부와 용강의 탕면사이 설정거리를 약 2100~2700mm정도로 하여 취련하는 경우 랜스의 하단부와 용강의 탕면사이 거리를 약 1900~2900mm 사이를 유지한 채 랜스를 상하이동시키면서 산소취련을 행한다. 이렇게 상취랜스를 상하로 왕복이동하여 취련하는 것은 약 300mm정도 두께를 갖는 슬래그층이 배가스에 의한 포밍현상으로 상당한 높이로 진행되어 슬래그가 슬로핑되는 현상을 방지하기 위함이다. 즉, 상취랜스가 포밍된 슬래그층속을 이동하면 그 속의 배가스가 원할히 밖으로 배출되어 슬로핑현상을 방지할 수 있게 된다.In the blowdown operation in the combined blower, the distance between the lower end of the upper lance and the hot water surface of the molten iron is determined by the amount of molten iron. Usually the setting distance between the lower end of the upper lance and the bath surface of the molten iron is about 2100 ~ 2700mm. Lifting according to the present invention is carried out by moving the lance up and down within the set distance ± 200mm between the lower end of the lance and the hot water surface of the molten steel. For example, in the case of drilling through the upper lance, when setting the distance between the lower end of the upper lance and the tap surface of the molten steel to about 2100 ~ 2700mm, the distance between the lower part of the lance and the tap surface of the molten steel is maintained between about 1900 ~ 2900mm. Oxygen is blown while moving the lance. In this way, the upper lance is reciprocated up and down to blow the slag layer having a thickness of about 300mm to form a phenomenon due to the exhaust gas to a considerable height to prevent the phenomenon of slagging. That is, when the upper lance moves in the foamed slag layer, the exhaust gas is smoothly discharged out of the slag layer to prevent the phenomenon of slipping.
상기 상취랜스의 왕복운동시기 및 간격은 슬래그층내의 가스가 원활히 밖으로 배출되도록 선정하는 것이 바람직하다.The reciprocating timing and interval of the upper lance is preferably selected so that the gas in the slag layer is smoothly discharged out.
상기 상취랜스의 왕복이동은 취련개시 4분~8분동안 약 10초간격으로 실시함이 바람직하다. 이는 제1도에 도시된 바와 같이, 취련개시후 약 4~8분 사이에 고규소함유용강내에서 슬로핑발생율이 가장 높기 때문이다. 상기 상취시 랜스의 하단부와 용강의 탕면사이 설정거리+200mm 이상의 범위로 벗어나도록 랜스를 상승하게 되면 상취랜스와 용강간의 거리가 너무 멀기 때문에 탈탄, 탈망간, 및 탈린 등과 같은 노내반응이 지연되어 취련시간이 연장되는 단점이 있게 되어 바람직하지 않다. 반면, 상기 상취시 랜스의 하단부와 용강의 탕면사이 설정거리-200mm 이하의 범위로 벗어나도록 랜스를 하강하게 되면 상취랜스와 용강간의 거리가 너무 가깝게 되어 랜스가 용손 뿐만아니라 지금이 부착될 염려가 생긴다.The reciprocating movement of the upper lance is preferably performed at intervals of about 10 seconds for 4 to 8 minutes at the start of the blow. This is because, as shown in FIG. 1, the incidence of the slope is highest in the high silicon-containing molten steel between about 4 to 8 minutes after the start of the blow. If the lance is raised so as to deviate from the lower end of the lance and the hot water surface of the molten steel beyond the set distance +200 mm or more, the distance between the upper lance and the molten steel is too far, and the furnace reactions such as decarburization, demanganese, and tallinn are delayed and blown. It is not desirable to have the disadvantage of prolonging time. On the other hand, when the lance is lowered so as to deviate from the lower end of the lance and the water level of the molten steel to fall within the range of 200 mm or less, the distance between the upper lance and the molten steel becomes too close, causing the lance to be attached as well as the dragon hand. .
한편, 상기 상취조업과 더불어 복합전로의 하부노즐을 통해 하취를 실시하는데, 이때 하취조업은 서로 이웃하는 하부노즐로에서부터 불활성가스를 교대로 취입하여 실시한다. 예를들어 4개의 하부노즐을 갖는 복합전로의 경우 1번과 3번 노즐로부터 불활성가스를 취입한 후 교대로 2번과 4번 노즐로부터 불활성가스를 취입한다. 중요한 점은 모든 노즐에서 동일한 유량으로 취련하지 않고, 하나의 하부노즐로부터 불활성가스를 약취를 행한 다음, 그 하부노즐에서의 취입을 완료함과 동시에 이웃하는 하부노즐에서 상기 약취하는 하부노즐에 비하여 불활성가스를 강취하는 것이다. 즉, 상기 예에서 1번 또는 1번과 3번의 하부노즐로부터 불활성가스에 의해 약취를 행한 다음, 상기 하부노즐에서의 취입을 완료함과 동시에 이웃하는 2번 또는 2번과 4번하부노즐에서 불활성가스를 강취하는 것이 바람직하다. 이렇게 이웃하는 하부노즐의 취련유량을 달리하면 슬래그층내의 압력차이가 발생되어 슬래그층의 붕괴가 용이하여 결국 슬래그층 밖으로 배가스의 배출이 용이하게 되며, 슬로핑발생이 더욱 줄어들게 되는 것이다. 이때, 본 발명에 따른 하취의 경우 종래의 하취유량보다 크게, 즉 구체적으로 용강톤당 0.03~0.08Nm3/분의 범위내에서 실시함이 바람직하다.On the other hand, the deodorization operation is carried out through the lower nozzle of the combined converter in addition, the deodorization operation is carried out by alternately blowing inert gas from the adjacent lower nozzle. For example, in the case of a composite converter having four lower nozzles, inert gas is blown from
이하, 본 발명을 실시예를 통하여 구체적으로 설명한다.Hereinafter, the present invention will be described in detail through examples.
실시예Example
하부에 4개의 노즐이 마련된 300톤급 복합취련전로에서 중량%로, 탄소:4.5%, 규소:0.63%, 망간:0.20%, 인:0.10%, 및 황: 0.005%를 포함하여 조성되는 용선에 상취랜스를 통해 산소를 취입하면서 상기 정련하였다. 이때, 상취랜스는 취련개시 4~8분 사이에 상기 용선의 탕면과 2100~2500mm의 범위만큼 떨어진 위치에서 10초 간격으로 상하이동하여 상취하였으며, 하취는 전로의 하부노즐 1번과 3번으로부터는 각각 용선톤당 0.03Nm3/분으로 취입한 다음, 일정간격으로 1번과 3번 노즐로부터의 가스 취입을 중단하는 동시에 하부노즐 2번과 4번으로부터 용선톤당 0.08Nm3/분으로 알곤가스를 취입하는 방식으로 진행하였다. 이러한 전로정련조업을 1년간 반복 실시하여 슬래그의 슬로핑발생정도, 노체수명 및 평균 용선장입량과 취련적중율을 측정하고 그 결과를 하기 표1에 나타내었다.In the 300-ton composite blower with four nozzles at the bottom, the molten iron is composed of weight%, carbon: 4.5%, silicon: 0.63%, manganese: 0.20%, phosphorus: 0.10%, and sulfur: 0.005%. The refining was carried out while blowing oxygen through the upper lance. At this time, the upper lance was lifted up and down at 10 second intervals from the hot water surface of the molten iron in the range of 2100 ~ 2500mm between 4-8 minutes at the start of drilling, and the lower odor was taken from the
상기 슬로핑발생정도는 공장내에 분진이 발생되는 정도의 슬로핑이 발생되는 차지수를 기준으로 전체 차지수에 대해 백분율로서 나타내었다. 또한, 취련적중율은 용선의 취련후 목표온도 및 성분이 맞는 차지수를 전체 차지수의 백분율로서 나타내었다.The degree of slope occurrence is expressed as a percentage of the total number of charges based on the number of charges in which the slope of the dust generated in the factory is generated. In addition, the blow hit ratio showed the number of charges to which the target temperature and the components after the blow of the molten iron were expressed as a percentage of the total charge.
한편, 본 발명과의 비교를 위해 사전에 용선의 장입량을 약 20톤 줄여 경장입하는 한편 슬래그코팅을 하지 않는 상태에서 상취랜스는 일정높이 2300mm로 고정하여 상취하고, 하부노즐로부터는 알곤가스를 전부 용선톤당 약 0.03Nm3/분으로 일정하게 취입하여 하취한 것을 제외하고는 발명예와 동일한 방식으로 취련조업을 하고, 그 결과를 하기 표1에 나타내었다.Meanwhile, for comparison with the present invention, the amount of molten iron is reduced to about 20 tons in advance and lightly charged, while the upper lance is fixed at a fixed height of 2300 mm without slag coating, and all the argon gas is lowered from the lower nozzle. The blowing operation was carried out in the same manner as in the invention example except that it was blown off at a constant rate of about 0.03 Nm 3 / min per molten ton, and the results are shown in Table 1 below.
상기 표1에 나타난 바와 같이, 본 발명예의 경우 종래방법에 비하여 슬로핑현상이 현저하게 감소되어 작업환경공해가 감소됨은 물론 전로의 평균장입량도 증가되었으며, 또한 노체수명도 크게 연장됨을 알 수 있었다. 그리고, 본 발명에 따른 취련조업결과 목표온도와 성분에 있어서도 종래방법과 크게 차이가 없음을 알 수 있었다.As shown in Table 1, in the case of the present invention, the slipping phenomenon was significantly reduced compared to the conventional method, and thus the environmental pollution was reduced, as well as the average loading of the converter was increased, and the life of the furnace was also greatly extended. In addition, it was found that the result of the blow operation according to the present invention was not significantly different from the conventional method in the target temperature and components.
상술한 바와 같이, 본 발명은 복합취련전로에서 상취랜스를 상하이동하여 상취하는 동시에 하부노즐로부터 불활성가스를 교대로 취입하는 하취조업을 적절히 제어하므로써 용선의 슬로핑방지, 특히 슬로핑현상이 과다 발생되는 고규소함유용선의 정련에 매우 적합하며, 이에 따라 환경공해방지 뿐만아니라 노체수명 및 생산성을 향상시킬 수 있는 효과가 있다.As described above, the present invention is excessively prevented from dropping of the molten iron by appropriately controlling the intake operation of alternately blowing inert gas from the lower nozzle while simultaneously inflating the uptake lance in the combined blower converter. It is very suitable for refining high silicon-containing charter, which is effective in preventing the environmental pollution as well as improving the life of the body and productivity.
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| KR1019970045922A KR100328030B1 (en) | 1997-09-05 | 1997-09-05 | A Method of Preventing Slopping Phenomena in Refinement of High Silicon Steel melts |
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