KR20000042037A - Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas - Google Patents
Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas Download PDFInfo
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- KR20000042037A KR20000042037A KR1019980058105A KR19980058105A KR20000042037A KR 20000042037 A KR20000042037 A KR 20000042037A KR 1019980058105 A KR1019980058105 A KR 1019980058105A KR 19980058105 A KR19980058105 A KR 19980058105A KR 20000042037 A KR20000042037 A KR 20000042037A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes
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Abstract
Description
본 발명은 이산화탄소 가스를 이용하여 전로슬래그 시효처리시 발생하는 폐수를 중화처리하는 방법에 관한 것으로, 보다 상세하게는 이산화탄소를 함유한 폐가스를 이용하여 전로슬래그 시효처리시 발생하는 알칼리성 폐수를 중화 처리하는 방법에 관한 것이다.The present invention relates to a method for neutralizing wastewater generated during aging treatment of slag using carbon dioxide gas, and more particularly to neutralizing alkaline wastewater generated during aging treatment of slag using waste gas containing carbon dioxide. It is about a method.
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 경우도 있으며, 온수에 담지시켜 시효처리할 수도 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. In some cases, aging treatment may be carried in hot water.
이와같이, 전로슬래그를 시효처리하는 것은 슬래그에 함유되어 있는 유리석회와 수분을 반응시키는 것을 목적으로 하고 있다. 이에 따라, 시효처리 과정에서는 항상 칼슘(Ca) 성분이 상당량 용해되어 있는 알칼리성 폐수가 발생하게 된다. 이 폐수가 그대로 방류되거나, 토양위에 고여있을 경우, 국부적으로 그 부분이 알칼리성으로 변하여 생태계에 악영향을 줄 수 있다.In this way, the aging treatment of the converter slag is intended to react the moisture with the glass lime contained in the slag. Accordingly, in the aging treatment, alkaline wastewater in which a significant amount of calcium (Ca) is dissolved is always generated. If this wastewater is discharged as it is or if it accumulates on the soil, it can become locally alkaline and adversely affect the ecosystem.
이에 본 발명의 목적은 이산화탄소를 이용하여 전로슬래그 시효처리시 발생하는 알칼리성 폐수를 중화처리하는데 있다.Accordingly, an object of the present invention is to neutralize alkaline wastewater generated during the conversion of converter slag by using carbon dioxide.
본 발명의 다른 목적은 이산화탄소 폐가스를 이용함으로써 보다 경제적으로 전로슬래그 시효처리시 발생하는 폐수를 중화처리하는데 있다.Another object of the present invention is to neutralize the wastewater generated during the converter slag aging treatment more economically by using carbon dioxide waste gas.
본 발명에 의하면,According to the invention,
전로슬래그 시효처리시 발생되는 알칼리성 폐수에 이산화탄소 또는 이를 함유하는 폐가스를 상기 폐수가 pH 6 ~ 9이 될 때까지 분사함으로써 중화함을 특징으로 하는 전로슬래그 시효처리시 발생하는 폐수의 중화, 처리 방법이 제공된다.Neutralization and treatment method of the wastewater generated in the converter slag aging treatment characterized in that the neutralization by spraying carbon dioxide or waste gas containing the same to the alkaline wastewater generated during the converter slag aging treatment until the waste water reaches pH 6 ~ 9 Is provided.
이하, 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.
본 발명의 방법에서는 전로슬래그를 시효처리하는 과정에서 발생된 폐수에 이산화탄소를 분사함으로써 상기 폐수를 중화, 처리한다. 분사되는 가스로는 이산화탄소 또는 이산화탄소를 함유한 폐가스를 사용할 수 있다.In the method of the present invention, the wastewater is neutralized and treated by injecting carbon dioxide into the wastewater generated during the aging treatment of the converter slag. As the injected gas, carbon dioxide or waste gas containing carbon dioxide may be used.
전로 슬래그는 슬래그에 함유되어 있는 유리 석회와 수분의 반응에 의해 시효처리한다. 즉, 전로 슬래그에 다량 함유된 불안정한 상태의 산화칼슘이 물과 반응하게 되면 하기 반응식 1과 같이 알칼리성의 수산화 칼슘이 발생한다. 따라서 전로슬래그를 시효처리함에 따라 시효처리시 사용되는 물내에는 시효처리됨에 따라 생성되는 수산화칼슘이 함유되며, 따라서 전로슬래그 시효처리시 발생되는 폐수는 알칼리성을 나타낸다. 이와같이 폐수에 이산화탄소 또는 이를 함유한 폐가스를 분사하면 하기식 2와 같은 반응이 발생하게 된다.Converter slag is aged by the reaction of free lime contained in the slag with water. That is, when calcium oxide in an unstable state contained in a large amount in the converter slag reacts with water, alkaline calcium hydroxide is generated as in Scheme 1 below. Therefore, as the aging treatment of the converter slag, the water used in the aging treatment contains calcium hydroxide produced by the aging treatment, and thus the wastewater generated during the aging treatment of the converter slag shows alkalinity. As such, when the carbon dioxide or waste gas containing the same is injected into the waste water, a reaction such as the following Equation 2 occurs.
〔반응식 1〕[Scheme 1]
CaO + H2O → Ca(OH)2 CaO + H 2 O → Ca (OH) 2
상기식 2에 나타난 바와 같이, 수산화 칼슘을 함유하는 알칼리성 폐수에 이산화탄소를 분사하면 중화반응에 의해 탄산칼슘(CaCO3)이 생성되어 침전됨으로써 폐수가 중화처리된다.As shown in Equation 2, when carbon dioxide is injected into alkaline wastewater containing calcium hydroxide, calcium carbonate (CaCO 3 ) is generated and precipitated by neutralization reaction, and the wastewater is neutralized.
이때, 이산화탄소 또는 이를 함유한 폐가스는 상기 전로슬래그의 시효처리후 배출되는 폐수의 pH가 6 ~ 9가 될 때까지 분사하는데, 이는 분사된 이산화탄소에 의해 전로슬래그로부터 녹아나온 칼슘 이온 또는 수산화 칼슘이 완전히 중화될 때까지 처리하기 위한 것이다.At this time, the carbon dioxide or the waste gas containing the same is injected until the pH of the wastewater discharged after the aging treatment of the converter slag becomes 6 to 9, which completely dissolves calcium ions or calcium hydroxide dissolved from the converter slag by the injected carbon dioxide. It is for processing until neutralized.
상기한 바와같이, 전로슬래그를 시효처리후 배출된 폐수에 이산화탄소를 분사함으로써 상기 폐수가 중화된다.As described above, the wastewater is neutralized by injecting carbon dioxide into the wastewater discharged after aging the converter slag.
본 발명의 방법을 실제 적용할 경우, 이산화 탄소는 제철소내의 석회 소성공장의 석회석 소성로와 같은 곳에서 발생하는이산화탄소 폐가스를 이용한다면 별도의 중화제 투입 비용을 필요로하지 않으며, 배출되는 이산화탄소를 재활용함으로써 CO2저감 효과도 있어 환경 오염 및 탄소세 부과와 관련된 비용 등을 절감할 수 있다.When the method of the present invention is practically applied, carbon dioxide does not require a separate neutralizer input cost if carbon dioxide waste gas generated in a limestone kiln of a lime kiln in a steel mill is used, and CO 2 is recycled by recycling the carbon dioxide emitted. 2 Reductions can also reduce costs associated with environmental pollution and carbon taxation.
이하 실시예를 통해 본 발명에 대해 설명한다.Hereinafter, the present invention will be described through examples.
실시예 1Example 1
8 ~ 15mm 입도의 전로 슬래그를 상온의 물과 80℃의 온수에 각각 담지시켜 20일동안 유지시킨 후 각각의 물을 따로 비이커에 500cc씩 받아 pH를 측정한 후, 이에 이산화탄소를 분사(bubbling)시키면서 pH가 정점에 이르렀을 때 최종 pH를 측정하여 그 결과를 표 2에 나타내었다.The converter slag of 8 to 15mm particle size was immersed in water at room temperature and hot water at 80 ℃, and maintained for 20 days. After receiving 500cc of each water in a beaker, measuring pH and then blowing carbon dioxide into it. When the pH peaked, the final pH was measured and the results are shown in Table 2.
표 2에 나타난 바와같이, 시효처리후 발생된 폐수의 pH는 비교적 알칼리성이 강하게 나타났으나, 이산화탄소를 분사하여 처리한 후에는 일반 증류수의 pH와 비슷한 수준으로 중화됨을 알 수 있다.As shown in Table 2, the pH of the wastewater generated after the aging treatment is relatively alkaline, but after the treatment by injection of carbon dioxide, it can be seen that it is neutralized to a level similar to that of general distilled water.
상기한 바와 같이, 본 발명의 방법에 의하면 이산화탄소 및 이산화탄소 함유 폐가스를 이용함으로써 전로슬래그를 시효처리한 후 발생된 폐수를 효율적으로 그리고 경제적으로 중화, 처리할 수 있다.As described above, according to the method of the present invention, by using carbon dioxide and carbon dioxide-containing waste gas, the wastewater generated after aging the converter slag can be neutralized and treated efficiently and economically.
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| KR1019980058105A KR20000042037A (en) | 1998-12-24 | 1998-12-24 | Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas |
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| KR1019980058105A KR20000042037A (en) | 1998-12-24 | 1998-12-24 | Method of neutralizing waste water generating in aging treatment of electric furnace slag using carbon dioxide gas |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020091513A (en) * | 2001-05-31 | 2002-12-06 | 유진화학(주) | PH control method of alkali solution with carbon dioxide gas and apparatus |
| KR100473519B1 (en) * | 2002-07-25 | 2005-03-10 | 한국에너지기술연구원 | Multiple steps type of alkali waste water neutralization system and its neutralization method |
| KR100750689B1 (en) * | 2006-08-17 | 2007-08-22 | 장용식 | Neutralization system for slag and method for neutralizing slag |
| KR100799344B1 (en) * | 2006-08-17 | 2008-01-30 | 장용식 | Carbon dioxide generator and neutralization system for alkaline leachate using the same |
| KR100822364B1 (en) * | 2007-09-10 | 2008-04-17 | 문창열 | Carbon dioxide reduction system using slag |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100220A (en) * | 1979-01-19 | 1980-07-31 | Sumitomo Metal Ind Ltd | Recovering method for calcium carbonate in converter slag |
| JPS62258793A (en) * | 1986-05-01 | 1987-11-11 | O H L:Kk | Method for neutralizing high-concentration alkali solution |
| JPS6445718A (en) * | 1987-08-14 | 1989-02-20 | Nippon Steel Corp | Production of calcium carbonate fine powder |
-
1998
- 1998-12-24 KR KR1019980058105A patent/KR20000042037A/en not_active Application Discontinuation
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55100220A (en) * | 1979-01-19 | 1980-07-31 | Sumitomo Metal Ind Ltd | Recovering method for calcium carbonate in converter slag |
| JPS62258793A (en) * | 1986-05-01 | 1987-11-11 | O H L:Kk | Method for neutralizing high-concentration alkali solution |
| JPS6445718A (en) * | 1987-08-14 | 1989-02-20 | Nippon Steel Corp | Production of calcium carbonate fine powder |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20020091513A (en) * | 2001-05-31 | 2002-12-06 | 유진화학(주) | PH control method of alkali solution with carbon dioxide gas and apparatus |
| KR100473519B1 (en) * | 2002-07-25 | 2005-03-10 | 한국에너지기술연구원 | Multiple steps type of alkali waste water neutralization system and its neutralization method |
| KR100750689B1 (en) * | 2006-08-17 | 2007-08-22 | 장용식 | Neutralization system for slag and method for neutralizing slag |
| KR100799344B1 (en) * | 2006-08-17 | 2008-01-30 | 장용식 | Carbon dioxide generator and neutralization system for alkaline leachate using the same |
| KR100822364B1 (en) * | 2007-09-10 | 2008-04-17 | 문창열 | Carbon dioxide reduction system using slag |
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