KR20000041665A - Seasoning method of electric furnace slag with hot carbonated water - Google Patents
Seasoning method of electric furnace slag with hot carbonated water Download PDFInfo
- Publication number
- KR20000041665A KR20000041665A KR1019980057619A KR19980057619A KR20000041665A KR 20000041665 A KR20000041665 A KR 20000041665A KR 1019980057619 A KR1019980057619 A KR 1019980057619A KR 19980057619 A KR19980057619 A KR 19980057619A KR 20000041665 A KR20000041665 A KR 20000041665A
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- South Korea
- Prior art keywords
- carbon dioxide
- electric furnace
- furnace slag
- converter slag
- carbonated water
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- 239000002893 slag Substances 0.000 title claims abstract description 42
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 14
- 235000011194 food seasoning agent Nutrition 0.000 title 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 44
- 230000032683 aging Effects 0.000 claims abstract description 23
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 22
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 abstract description 8
- 239000002912 waste gas Substances 0.000 abstract description 8
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 5
- 238000005507 spraying Methods 0.000 abstract description 2
- 239000000292 calcium oxide Substances 0.000 abstract 3
- 238000000151 deposition Methods 0.000 abstract 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 abstract 1
- 239000000920 calcium hydroxide Substances 0.000 abstract 1
- 235000011116 calcium hydroxide Nutrition 0.000 abstract 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 abstract 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 abstract 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 6
- 235000011941 Tilia x europaea Nutrition 0.000 description 6
- 239000011575 calcium Substances 0.000 description 6
- 239000004571 lime Substances 0.000 description 6
- 150000001875 compounds Chemical class 0.000 description 4
- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000010828 elution Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
Classifications
-
- 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
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Metallurgy (AREA)
- Structural Engineering (AREA)
- Furnace Details (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
Description
본 발명은 전로 슬래그의 시효처리 방법에 관한 것으로, 보다 상세하게는 탄산 온수에 전로 슬래그를 담지함으로써 효율적으로 전로슬래그를 시효처리하는 방법에 관한 것이다.The present invention relates to a method of aging the converter slag, and more particularly to a method of aging the converter slag efficiently by supporting the converter slag in carbonated hot water.
전로 슬래그는 제강공정에서 발생되는 부산물로서 발생상태는 용융상이며 이후에 냉각 고화되면 검은 색의 암석과 같은 괴상의 형태를 가지고 있으며 표 1과 같은 화학성분을 가지고 있다.Converter slag is a by-product from the steelmaking process. The state of occurrence is molten phase, and after cooling and solidification, it has a black rock-like mass and has the chemical composition shown in Table 1.
표 1에 나타낸 바와 같이, 전로슬래그를 구성하고 있는 주요성분은 CaO, SiO2, Fe 산화물임을 알 수 있다. 이 중에서 가장 많은 함량을 차지하고 있는 것은 CaO이며, 이것은 SiO2, Al2O3, FeO 등의 타성분들과 결합하여 안정한 화합물을 형성하지만, 타성분들에 비하여 과다한 함량을 가지고 있어서 모두 화합물 형성에 참여하지 못하고, 잉여의 CaO가 남아서 유리석회(free CaO) 상태로 남아 있거나, 고온 상태에서 화합물을 형성하고 있었던 CaO 중에서도 일부가 냉각됨에 따라 유리석회로 석출될 수도 있다.As shown in Table 1, it can be seen that the main components constituting the converter slag are CaO, SiO 2 , Fe oxide. CaO is the most abundant of these compounds, which combine with other components such as SiO 2 , Al 2 O 3 , FeO to form a stable compound, but because they have an excessive content compared to other components, all do not participate in compound formation In addition, excess CaO may remain and remain in free lime, or may be precipitated as free lime as some of the CaO that is forming a compound at a high temperature is cooled.
한편, 전로슬래그 내에 잔존하는 유리석회는 수분과 반응할 경우 다음의 반응을 일으키게 된다.On the other hand, the free lime remaining in the converter slag causes the following reaction when reacted with moisture.
상기 반응은 약 2배의 부피팽창을 동반하므로, 유리석회가 포함되어 있는 전로슬래그를 골재로 사용할 경우 사용된 구조물에 균열 또는 붕괴를 가져올 수 있다. 따라서, 전로슬래그를 골재로 사용하기 위해서는 이러한 팽창성을 안정화시키거나, 사전에 시효처리(aging) 과정을 거쳐 미리 팽창시킨 후 사용해야만 한다.Since the reaction is accompanied by a volume expansion of about 2 times, when using the converter slag containing the glass lime as an aggregate may cause cracking or collapse of the structure used. Therefore, in order to use the converter slag as an aggregate, such expandability must be stabilized, or must be used after expanding in advance through an aging process.
통상 전로슬래그는 일정기간의 시효처리과정을 거쳐 사용하는 것이 일반적이며, 그 기간은 옥외상태에서 6개월 이상의 시간을 필요로 한다. 최근에는 이러한 시효처리 시간을 줄이기 위해 증기 시효처리(steam aging) 방법이 사용되고 있으며, 일본의 제철소의 경우 대부분 증기를 이용하고 있고, 일부에서는 시간을 더욱 단축하기 위해 오토클레이브(autoclave)에서 고압의 증기를 사용하는 곳도 있다.In general, converter slag is used through a aging process for a certain period of time, which requires more than six months in the outdoors. In recent years, steam aging has been used to reduce the aging time, and most of Japan's steel mills use steam, and some use high-pressure steam in autoclaves to further shorten the time. There is also a place to use.
현재, 국내 제철소에서 발생되고 있는 전로슬래그는 전로 취련 후 슬래그 포트에 옮겨져 슬래그 배재장으로 이동되어 배재된다. 용융상태로 배재된 전로슬래그는 대기중에 그대로 방치되어 자연 냉각과정을 거쳐 완전히 고화된 후 최종적으로 냉각수를 살포함으로써 강제 냉각된다. 냉각된 슬래그는 슬래그 파쇄설비로 옮겨져 파쇄 및 입도분리 공정을 거친 후 각 입도별로 정해진 활용처로 운송되며, 골재로 활용할 시에는 6개월 이상의 자연 시효처리과정을 거친 후 사용하게 된다. 이와같이 국내의 경우 자연 시효처리에 의존하고 있다.Currently, converter slag generated in domestic steel mills is transferred to the slag port after the converter is blown and moved to the slag distribution site. The converter slag discharged in the molten state is left as it is in the air, is completely solidified through the natural cooling process, and is finally forcedly cooled by spraying the cooling water. The cooled slag is transferred to the slag crushing facility, after crushing and particle size separation process, and transported to the designated location for each particle size. As such, Korea relies on natural aging.
이에 본 발명의 목적은 탄산 온수에 전로슬래그를 담지시켜 시효처리를 함으로써 효율적으로 시효처리하는 방법을 제공하는 것이다.Accordingly, an object of the present invention is to provide a method of efficiently aging by carrying out aging treatment by supporting the converter slag in carbonate hot water.
본 발명의 다른 목적은 이산화탄소를 함유한 폐가스를 이용하여 전로슬래그를 시효처리함으로써 보다 경제적으로 시효처리하는 방법을 제공하는 것이다.Another object of the present invention is to provide a method of aging treatment more economically by aging the converter slag using waste gas containing carbon dioxide.
도 1은 이산화탄소 폐가스를 이용하는 전로슬래그 시효처리 장치의 개략도다.1 is a schematic diagram of a converter slag aging treatment apparatus using carbon dioxide waste gas.
본 발명에 의하면,According to the invention,
이산화탄소(CO2) 가스가 주입되는 온수에 전로 슬래그를 담지시켜 시효처리하며, 상기 시효 처리후 배출되는 상기 온수의 배출수의 pH는 6 ~ 9의 범위에 있도록 조절함을 특징으로 하는 전로 슬래그의 시효 처리 방법이 제공된다.Aging treatment by loading the converter slag in hot water injected with carbon dioxide (CO 2 ) gas, and the pH of the discharged water of the hot water discharged after the aging treatment is adjusted to be in the range of 6 ~ 9 A treatment method is provided.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명의 방법에서는 이산화 탄소가스가 분사되는 온수에 전로 슬래그를 담지하는 방법에 의해 전로 슬래그를 시효처리한다. 분사되는 가스로는 이산화탄소 또는 이산화탄소를 함유한 폐가스를 사용할 수 있다. 이때, 이산화탄소 및 이산화탄소를 함유한 폐가스가 유입됨에 따라 상기 탄산 온수내에서는 다음과 같은 반응에 의해 전로 슬래그가 시효처리된다.In the method of the present invention, the converter slag is aged by the method of supporting the converter slag in hot water sprayed with carbon dioxide gas. As the injected gas, carbon dioxide or waste gas containing carbon dioxide may be used. At this time, as the waste gas containing carbon dioxide and carbon dioxide is introduced, the converter slag is aged in the carbonated hot water by the following reaction.
〔반응식 1〕[Scheme 1]
CaO + H2O → Ca(OH)2 CaO + H 2 O → Ca (OH) 2
상기 반응식 1과 2에 나타난 바와 같이, 전로 슬래그를 탄산 온수에 담그면 전로 슬래그의 유리 석회(CaO)가 물과 반응하여 Ca(OH)2가 생성되며, 이 Ca(OH)2가 CO2와 반응하여 탄산칼슘(CaCO3) 이 생성되어 침전된다. 이로 인해 유리 석회를 용출을 촉진되거나, 전로 슬래그의 표면부가 중성화되어 부피 팽창성이 안정되는 것으로 여겨진다.As shown in Schemes 1 and 2, when the converter slag is immersed in hot carbonate hot water, the free lime (CaO) of the converter slag reacts with water to produce Ca (OH) 2 , and the Ca (OH) 2 reacts with CO 2. Calcium carbonate (CaCO 3 ) is produced and precipitated. It is believed that this facilitates the elution of the free lime, or the surface portion of the converter slag is neutralized to stabilize the volume expandability.
한편, 시효처리된 후 배출수의 pH는 6 ~ 9의 범위에 있도록 조절하는데, 이는 상기와 같이 유리 석회(CaO)가 물과 반응하여 생성된 Ca(OH)2가 CO2에 의해 완전히 중화되는 것을 확인하고 또한 조절하기 위해서이다.On the other hand, after aging treatment, the pH of the effluent is adjusted to be in the range of 6 to 9, which indicates that the Ca (OH) 2 produced by the reaction of free lime (CaO) with water is completely neutralized by CO 2 as described above. To check and adjust.
상기 배출수의 pH는 통상의 알려진 방법에 의해 실시간으로 측정하여 조절할 수 있다.The pH of the effluent can be measured and adjusted in real time by conventionally known methods.
상기한 바와 같이, 이산화탄소가 분사되는 온수, 즉 탄산온수에 전로 슬래그를 침지함으로써 전로 슬래그가 시효처리된다.As described above, the converter slag is aged by immersing the converter slag in hot water sprayed with carbon dioxide, that is, carbonated hot water.
본 발명의 방법을 실제 적용할 경우, 이산화 탄소는 제철소내의 석회 소성공장의 석회석 소성로와 같은 곳에서 발생하는 고열의 이산화탄소 폐가스를 이용한다면 열회수를 할 수 있어 에너지 비용없이 온수를 얻을 수 있고, 이산화탄소 배출 저감 효과가 탁월하여 환경 오염 및 탄소세 부과와 관련된 비용 등을 저감할 수 있어 매우 효과적이다.When the method of the present invention is practically applied, carbon dioxide can be heat-recovered using high-temperature carbon dioxide waste gas generated in a limestone kiln of a lime kiln in a steel mill, so that hot water can be obtained without energy costs, and carbon dioxide is emitted. Excellent reduction effect is very effective because it can reduce the costs associated with environmental pollution and carbon tax imposed.
이하 실시예를 통해 본 발명에 대해 설명한다.Hereinafter, the present invention will be described through examples.
실시예 1Example 1
적정 용량의 수조 2기에 각각 전로슬래그를 투입하고 물을 채워 전로슬래그가 완전히 잠기도록 하였다. 이후에 수조의 물을 가열하여 80℃로 가열하여 유지시키면서 두 수조중 한군데는 이산화탄소 가스를 수조바닥에서 불어 넣었다. 이때 이산화탄소 가스가 바닥에서 상부까지 골고루 퍼져서 부상할 수 있도록 가스 투입량과 투입 배관을 적절히 조절하였다.The converter slag was put into two tanks of appropriate capacity and filled with water so that the converter slag was completely submerged. Thereafter, the water in the tank was heated and maintained at 80 ° C., while one of the two tanks was blown with carbon dioxide gas from the bottom of the tank. At this time, the gas input amount and the input pipe were properly adjusted so that the carbon dioxide gas could be evenly spread from the bottom to the top.
이상의 실험 장치에서 시효 처리 된 전로 슬래그를 처리시간별로 시료를 채취하여 팽창율(KS F 2320)을 측정하여, 한국산업규격에서 도로용 골재로의 사용기준(팽창율 1.5%이하)과 시효처리 소요 시간을 비교하였다.By measuring the expansion rate (KS F 2320) by sampling the converter slag aged in the above experimental device for each treatment time, the standard of use (expansion rate of 1.5% or less) and the time required for aging treatment were measured. Compared.
표 2의 결과에 의하면 일반 온수 시효처리를 할 경우 4일 이상이 되어야 1.5%이하의 팽창율을 얻을 수 있는 반면, 이산화탄소를 온수에 불어 넣을 경우 시효처리를 2일 이상할 경우 1.5%이하로 될 수 있음을 알 수 있다.According to the results of Table 2, the expansion rate of 1.5% or less can be obtained when the hot water aging treatment is 4 days or more, but it can be 1.5% or less when the aging treatment is more than 2 days when carbon dioxide is blown into the hot water. It can be seen that.
상기한 바와 같이, 본 발명에 의하면 이산화탄소를 함유한 폐가스에 전로슬래그를 침지함으로써 경제적으로 그리고 효율적으로 전로슬래그를 시효처리할 수 있다.As described above, according to the present invention, the converter slag can be aged economically and efficiently by dipping the converter slag in the waste gas containing carbon dioxide.
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| KR1019980057619A KR20000041665A (en) | 1998-12-23 | 1998-12-23 | Seasoning method of electric furnace slag with hot carbonated water |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100476811B1 (en) * | 2000-12-21 | 2005-03-17 | 주식회사 포스코 | A pretreatment method of steel slag by using carbon dioxide |
| KR100482198B1 (en) * | 2000-12-21 | 2005-04-13 | 주식회사 포스코 | A removal method of milky particles generated from steel slag |
| KR100590994B1 (en) * | 2004-09-08 | 2006-06-19 | 재단법인 포항산업과학연구원 | The method for aging a steel making slag |
| KR100778551B1 (en) * | 2006-12-20 | 2007-11-28 | 주식회사 포스코 | Method for treating surface of slag |
| KR100821045B1 (en) * | 2001-10-17 | 2008-04-08 | 주식회사 포스코 | method of preventing a hydration for BOF slag |
| KR101220711B1 (en) * | 2011-04-11 | 2013-01-09 | 임정빈 | Stabilization of Free CaO Components in Steel Slag Using Carbon Dioxide |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152411A (en) * | 1981-03-17 | 1982-09-20 | Nippon Steel Corp | Treatment for stabilization of slag in steel making |
| JPS6445718A (en) * | 1987-08-14 | 1989-02-20 | Nippon Steel Corp | Production of calcium carbonate fine powder |
| JPH0692697A (en) * | 1992-09-16 | 1994-04-05 | Kawasaki Steel Corp | Method for modifying slag of steel manufacture |
-
1998
- 1998-12-23 KR KR1019980057619A patent/KR20000041665A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57152411A (en) * | 1981-03-17 | 1982-09-20 | Nippon Steel Corp | Treatment for stabilization of slag in steel making |
| JPS6445718A (en) * | 1987-08-14 | 1989-02-20 | Nippon Steel Corp | Production of calcium carbonate fine powder |
| JPH0692697A (en) * | 1992-09-16 | 1994-04-05 | Kawasaki Steel Corp | Method for modifying slag of steel manufacture |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100476811B1 (en) * | 2000-12-21 | 2005-03-17 | 주식회사 포스코 | A pretreatment method of steel slag by using carbon dioxide |
| KR100482198B1 (en) * | 2000-12-21 | 2005-04-13 | 주식회사 포스코 | A removal method of milky particles generated from steel slag |
| KR100821045B1 (en) * | 2001-10-17 | 2008-04-08 | 주식회사 포스코 | method of preventing a hydration for BOF slag |
| KR100590994B1 (en) * | 2004-09-08 | 2006-06-19 | 재단법인 포항산업과학연구원 | The method for aging a steel making slag |
| KR100778551B1 (en) * | 2006-12-20 | 2007-11-28 | 주식회사 포스코 | Method for treating surface of slag |
| KR101220711B1 (en) * | 2011-04-11 | 2013-01-09 | 임정빈 | Stabilization of Free CaO Components in Steel Slag Using Carbon Dioxide |
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