KR100922562B1 - A Method for Preparing CaCO3 With Desulfurization Slag and CO2 - Google Patents

A Method for Preparing CaCO3 With Desulfurization Slag and CO2 Download PDF

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KR100922562B1
KR100922562B1 KR1020020057835A KR20020057835A KR100922562B1 KR 100922562 B1 KR100922562 B1 KR 100922562B1 KR 1020020057835 A KR1020020057835 A KR 1020020057835A KR 20020057835 A KR20020057835 A KR 20020057835A KR 100922562 B1 KR100922562 B1 KR 100922562B1
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carbon dioxide
slag
calcium
eluate
calcium carbonate
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KR20040026382A (en
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김형석
한기현
변태봉
이학봉
배우현
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재단법인 포항산업과학연구원
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    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01FCOMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00Compounds of calcium, strontium, or barium
    • C01F11/18Carbonates
    • C01F11/181Preparation of calcium carbonate by carbonation of aqueous solutions and characterised by control of the carbonation conditions
    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00Physical properties of inorganic compounds
    • C01P2006/80Compositional purity
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/20Waste processing or separation
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies

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Abstract

탈류 슬래그의 칼슘 용출액과 이산화탄소 함유 배가스를 이용한 탄산칼슘 제조방법에 관한 것으로, 탈류슬래그를 45㎛이하로 분쇄한 후 물에 첨가하여 유황성분을 용출시키고 유황성분이 용출된 유황용출액을 분리제거하는 단계; 물에 상기 유황용출액이 분리 제거된 탈류슬래그를 첨가하고 pH 12이상이 되도록 조정하여 pH 12이상의 칼슘 이온 용출액을 얻는 단계; 및 상기 칼슘 이온 용출액과 이산화탄소 혹은 이산화탄소 함유 배가스를 pH 7이상이 되도록 하여 반응시키는 단계를 포함하는 고순도 탄산칼슘 제조방법이 제공된다. 폐기처분되고 있는 탈류 슬래그를 이용하여 고순도의 탄산칼슘이 제조된다. 또한, 이산화탄소 함유 배가스등이 이용됨으로 친환경적이다.
The present invention relates to a method for producing calcium carbonate using a calcium eluate of demineralized slag and a flue gas containing carbon dioxide, wherein the demineralized slag is pulverized to 45 μm or less, and then added to water to elute sulfur components and to remove and remove sulfur components. ; Adding a desulfurization slag from which the sulfur eluate is separated and removed into water and adjusting the pH to 12 or more to obtain a calcium ion eluate having a pH of 12 or more; And it provides a high-purity calcium carbonate production method comprising the step of reacting the calcium ion eluate with carbon dioxide or carbon dioxide-containing exhaust gas to pH 7 or more. Calcium carbonate of high purity is produced by using the deflowed slag that is disposed of. In addition, it is environmentally friendly because carbon dioxide-containing flue gas is used.

탈류슬래그, 이산화탄소, 탄산칼슘Degassed slag, carbon dioxide, calcium carbonate

Description

탈류슬래그와 이산화탄소를 이용한 탄산칼슘 제조방법{A Method for Preparing CaCO3 With Desulfurization Slag and CO2}A method for preparing CaCO3 with desulfurization slag and CO2}

본 발명은 탈류슬래그와 이산화탄소를 이용한 탄산칼슘(CaCO3) 제조방법에 관한 것이며, 보다 상세하게는 탈류 슬래그의 칼슘 용출액과 이산화탄소 함유 배가스를 이용한 탄산칼슘 제조방법에 관한 것이다.
The present invention relates to a method for producing calcium carbonate (CaCO 3 ) using degassed slag and carbon dioxide, and more particularly to a method for producing calcium carbonate using a calcium eluate and a carbon dioxide-containing flue gas of degassed slag.

탈류슬래그는 제철소에서 용선중의 유황을 제거하는 탈류공정에서 발생된다. 따라서, 이 탈류슬래그는 황성분을 포함하고 있으며, 현재 거의 활용되지 못하고 있는 실정이다.
Reflow slag is produced in the desulfurization process to remove sulfur in molten iron at steel mills. Therefore, this desulfurization slag contains sulfur and is currently rarely utilized.

탈류슬래그는 하기 표 1에 나타낸 바와 같은 성분으로 구성된다. The outflow slag is composed of components as shown in Table 1 below.

[표 1] 탈류 슬래그의 화학성분(중량%)[Table 1] Chemical Composition (Weight%) of Deflow Slag

구분division CaOCaO SiO2 SiO 2 T-FeT-Fe Al2O3 Al 2 O 3 MgOMgO MnOMnO SS 탈류Dehydration 48-5048-50 21-2421-24 0.5-1.50.5-1.5 4-74-7 2-52-5 0.5-1.20.5-1.2 0.7-1.80.7-1.8

(기타 잔부는 FeO, Fe2O3, CaO, Ca(OH)2, CaCO3, CaSO4등으로 구성됨)
(Other balance consists of FeO, Fe2O3, CaO, Ca (OH) 2, CaCO3, CaSO4, etc.)

탈류슬래그의 화학성분을 보면 제강슬래그와 같이 산화칼슘을 다량 함유하고 있어서, 높은 염기도를 나타내며, 탈류 슬래그를 물속에 넣으면 산화칼슘중의 일부가 용출되어 알칼리성을 나타낸다. 한편, 탈류 슬래그에는 유황(S) 성분이 포함되어 있으므로 물과 반응시키면 유황이 함께 용출되며, 이는 탄산칼슘 제조시 불순물로 작용한다.
In the chemical composition of the degassed slag, it contains a large amount of calcium oxide like steelmaking slag, and shows high basicity. When the degassed slag is put into water, part of the calcium oxide is eluted and alkaline. On the other hand, since the desulfurization slag contains the sulfur (S) component, sulfur is eluted together when reacted with water, which acts as an impurity in the preparation of calcium carbonate.

한편, 지구온난화의 원인인 이산화탄소 가스를 감소시키기 위해 배가스중의 이산화탄소 가스를 효과적으로 분리하는 분리방법 및 분리된 이산화탄소의 처리 및 활용방법으로 깊은 바다 밑에 저장하는 방법, 메탄올 제조에 사용하는 방법등이 연구되어 왔다. 그러나 아직 경제적이고 실용성 있는 활용방법은 없는 실정이다.
On the other hand, in order to reduce the carbon dioxide gas which is the cause of global warming, the research on the separation of the carbon dioxide gas from the flue gas effectively, the method of storing and using the separated carbon dioxide under deep sea, the method used for the manufacture of methanol, etc. Has been. However, there is no economic and practical method of utilization yet.

침강성 탄산칼슘의 제조방법으로는 탄산가스 화합방법, 석회소다방법 및 소다방법 등으로 있으며, 일본 특개평 11-31495 및 일본 특개 2001-270713 등과 같이 주로 탄산가스 화합방법으로 제조되어 왔다. 즉 석회석(CaCO3)을 소성하여 생석회(CaO)를 만들고, 이 생석회(CaO)와 물(H2O)을 반응시켜 소석회유(Ca(OH)2)를 제조하고, 이 소석회유(Ca(OH)2)에 이산화탄소 기체를 불어 넣어 반응시킴으로써 침강성 탄산칼슘(CaCO3)을 석출시킨다. 이러한, 화합방법에서는 탄산칼슘 석출에 필요한 칼슘성분은 석회석을 열분해 시켜 만든 소석회를 사용하고 탄산가스는 석회석 분해시 에 발생된 탄산가스를 회수하여 사용하지만, 반응율이 100%가 될 수 없으므로 일부는 반응 중에 대기중으로 방출될 것이다. 즉, 석회석을 원료로 사용할 경우 소성 공정에서 이산화탄소가 발생한다. 따라서, 환경 오염을 야기할 뿐만 아니라 제조공정이 복잡하고 석회석을 1000oC 이상의 고온으로 소성하여 중간 물질인 생석회를 제조함으로, 고가의 제조비용이 소요된다.
Methods for producing precipitated calcium carbonate include a carbon dioxide gas compounding method, a lime soda method and a soda method, and have been mainly produced by a carbon dioxide gas compounding method such as Japanese Patent Laid-Open No. 11-31495 and Japanese Patent Laid-Open 2001-270713. That is, calcined limestone (CaCO 3 ) to form quicklime (CaO), and reacted with the quicklime (CaO) and water (H 2 O) to prepare calcareous oil (Ca (OH) 2 ), this calcareous oil (Ca ( OH) 2 ) precipitates precipitated calcium carbonate (CaCO 3 ) by blowing carbon dioxide gas into the reaction. In such a compounding method, calcium components required for calcium carbonate precipitation use slaked lime made by pyrolysis of limestone and carbon dioxide is used to recover carbon dioxide generated during limestone decomposition, but the reaction rate cannot be 100%. Will be released into the atmosphere. That is, when limestone is used as a raw material, carbon dioxide is generated in the firing process. Therefore, not only does it cause environmental pollution, and the manufacturing process is complicated, and calcined limestone at a high temperature of 1000 ° C. or higher to produce quicklime, an intermediate material, and thus, expensive manufacturing cost is required.

따라서, 이산화탄소 발생량을 저감하기 위해서는 칼슘성분을 석회석에서 공급해서는 안되고 이산화탄소와 결합하지 않은 칼슘원을 사용하여야한다. 이와 같은 칼슘원으로는 염화칼슘, 질산칼슘 등이 있지만 이들 약품 또한 고가이다.
Therefore, in order to reduce the amount of carbon dioxide generated, calcium components should not be supplied from limestone and calcium sources not combined with carbon dioxide should be used. Such calcium sources include calcium chloride and calcium nitrate, but these drugs are also expensive.

이외에도 제철소 스테인레스강 정련공장의 부원료분진과 탄산가스를 이용하여 탄산칼슘을 제조하는 방법이 대한민국 특허출원 98-54120호로 출원된 바 있다. 상기 특허에서는 제철소에서 스테인레스강을 정련할 때 사용하는 생석회, 돌로마이트와 같은 부원료의 저장 또는 이송중에 발생하는 분진을 집진설비를 이용하여 집진한 부원료 분진으로 현탁액을 제조한 후 탄산가스의 탄산화반응으로 탄산칼슘을 제조하는데, 이 때 현탁액은 소석회유(Ca(OH)2)이며, 현탁액 내의 소석회가 탄산가스와 반응하여 탄산칼슘을 생성한다. 그러나, 이때 생성되는 탄산칼슘과 현탁액내의 미반응 소석회 입자는 모두 백색 입자로써 구별이 용이하지 않으며, 반응 종점에서 일부 미반응 소석회가 존재할 경우 이는 최종물에서 불순물로서 작용하여 최종물의 순도가 떨어지는 문제가 있다.
In addition, a method for manufacturing calcium carbonate using secondary raw material dust and carbon dioxide gas of a steel mill in a steel mill has been filed in Korean Patent Application No. 98-54120. In the patent, a suspension is made of a subsidiary material dust collected during dust storage or transport of subsidiary materials such as quicklime and dolomite used for refining stainless steel in a steel mill using a dust collecting facility, and then carbonated by carbonation reaction of carbon dioxide gas. In preparing calcium, the suspension is hydrated lime oil (Ca (OH) 2 ), and the lime in the suspension reacts with carbon dioxide to produce calcium carbonate. However, the calcium carbonate produced and the unreacted limestone particles in the suspension are not easily distinguishable as white particles, and if some unreacted limestone is present at the end of the reaction, it acts as an impurity in the final product, resulting in a lower purity of the final product. have.

이에 본 발명의 목적은 탈류슬래그의 칼슘이온 용출액과 이산화탄소 혹은 이산화탄소 함유 배가스를 이용한 고순도 탄산칼슘 제조방법을 제공하는 것이다.
Accordingly, an object of the present invention is to provide a high-purity calcium carbonate production method using a calcium ion eluate of demineralized slag and carbon dioxide or carbon dioxide-containing flue gas.

본 발명의 다른 목적은 탈유슬래그 및 이산화탄소 함유 배가스등 폐자원을 활용한 고순도의 탄산칼슘 제조방법을 제공하는 것이다.
Another object of the present invention is to provide a high-purity calcium carbonate production method utilizing waste resources such as deoiled slag and carbon dioxide-containing flue gas.

본 발명에 의하면, According to the invention,

탈류슬래그를 45㎛이하로 분쇄한 후 물에 첨가하여 유황성분을 용출시키고 유황성분이 용출된 유황용출액을 분리제거하는 단계;Pulverizing the degassed slag to 45 μm or less, and then eluting the sulfur component by adding water to the sulfur and separating and removing the sulfur eluate from which the sulfur component is eluted;

물에 상기 유황용출액이 분리 제거된 탈류슬래그를 첨가하고 pH 12이상이 되도록 조정하여 pH 12이상의 칼슘 이온 용출액을 얻는 단계; 및Adding a desulfurization slag from which the sulfur eluate is separated and removed into water and adjusting the pH to 12 or more to obtain a calcium ion eluate having a pH of 12 or more; And

상기 칼슘 이온 용출액과 이산화탄소 혹은 이산화탄소 함유 배가스를 pH 7이상이 되도록 하여 반응시키는 단계;Reacting the calcium ion eluate with carbon dioxide or carbon dioxide-containing flue gas to pH 7 or higher;

를 포함하는 고순도 탄산칼슘 제조방법이 제공된다. There is provided a high purity calcium carbonate production method comprising a.

이하, 본 발명에 대하여 상세히 설명한다. EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated in detail.

탈류슬래그에는 상기 표 1에 나타낸 바와 같이 CaO가 약 50% 내외로 함유되어 있으 나, 유리 CaO(free CaO)는 수 %에 지나지 않으며, 대부분 CaO는 다른 성분과 화합물을 형성하고 있어서 비교적 안정한 상태이며, 또한, 탈류슬래그중의 황성분은 탄산칼슘 제조시 불순물로 작용함으로 그 이용이 용이하지 않았다.
As shown in Table 1, the deflow slag contains about 50% of CaO, but free CaO (free CaO) is only a few%, and most of CaO forms a compound with other components and is relatively stable. In addition, the sulfur component in the degassing slag acted as an impurity in the preparation of calcium carbonate, so its use was not easy.

따라서, 본 발명에서는 1차적으로 탄산칼슘 제조시 불순물을 형성하는 황(S) 성분을 탈류슬래그에서 제거한 후, 물(H2O)과 황(S)성분이 제거된 탈류슬래그를 반응시켜 칼슘(Ca) 용출액을 제조하고, 이 칼슘 용출액을 이산화탄소 또는 이산화탄소를 함유하는 배가스와 반응시킴으로써 침강성 탄산칼슘을 제조한다.
Therefore, in the present invention after removing the sulfur (S) component to form the manufacture of calcium carbonate impurities primarily in desulfurization slag, water (H 2 O) and sulfur (S) calcium by reacting a desulfurization slag of the components are removed ( Ca) An eluate is prepared, and precipitated calcium carbonate is produced by reacting the calcium eluate with carbon dioxide or a flue gas containing carbon dioxide.

본 발명에서는 또한, 탄산칼슘 제조에 이산화탄소를 함유하는 배가스가 사용됨으로, 대기중으로 방출되는 유해한 탄산가스의 함량이 감소된다.
In the present invention, the exhaust gas containing carbon dioxide is also used for the production of calcium carbonate, whereby the content of harmful carbon dioxide released into the atmosphere is reduced.

나아가, 본 발명에 의하면 탈류 슬래그 용출액과 이산화탄소 함유 배가스를 반응시켜 침강 탄산칼슘을 석출시킴에 있어서, 배가스중의 이산화탄소 가스를 분리할 필요없이 이산화탄소 함유 배가스를 그대로 사용가능한 것이다. 또한, 배가스중의 이산화탄소를 분리하여 사용할 수도 있다.
Further, according to the present invention, in the precipitation of precipitated calcium carbonate by reacting the degassed slag eluate with the carbon dioxide-containing flue gas, the carbon dioxide-containing flue gas can be used as it is without the need to separate the carbon dioxide gas in the flue gas. It is also possible to separate and use carbon dioxide in the flue gas.

본 발명에서, 칼슘공급원으로 칼슘이 산화칼슘으로 존재하는 제철소 부생 탈류 슬래그가 사용되나, 탈류슬래그중의 유황성분은 탄산칼슘 제조시 불순물로 작용한다. In the present invention, iron by-product by-flow degassing slag in which calcium is present as calcium oxide is used as a calcium source, but the sulfur component in the degassing slag serves as an impurity in the preparation of calcium carbonate.                     

즉, 탈류 슬래그중의 유황은 대부분 유화칼슘(CaS)으로 존재하는데 탈류 슬래그를 물과 반응시키면 유화칼슘이 용해하여 S2- 형태로 존재하며, 이는 탄산칼슘 석출과정 중에 배가스를 사용할 경우, 일부 존재하는 산소와 반응하여 석고로 석출되므로 주 생성물인 탄산칼슘의 순도를 낮추는 불순물로서 작용한다. 따라서, 탈류슬래그를 사용하여 탄산칼슘을 제조하기 전에 탈류슬래그 중의 황성분을 제거하여야 한다.
In other words, sulfur in the degassed slag is mostly present as calcium emulsion (CaS). When the degassed slag is reacted with water, the calcium emulsion dissolves and is present in the form of S 2- which is partially present when exhaust gas is used during the precipitation of calcium carbonate. It reacts with oxygen and precipitates as gypsum, which acts as an impurity to lower the purity of calcium carbonate, the main product. Therefore, the sulfur component in the degassing slag must be removed before the calcium carbonate is produced using the degassing slag.

탈류 슬래그를 물속에 장입하면 유화칼슘은 전부 용해하지만, 산화칼슘은 일부만 용해하는 성질, 즉 소석회의 용해도가 낮은 성질을 이용하여, 탈류 슬래그를 물속에 장입함으로써 유황성분을 용출시킨다. 그 후, 유황 용출액은 분리, 제거하고 남은 탈류 슬래그를 다시 물과 반응시켜 칼슘성분이 이온상태로 용출되어 존재하는 강알칼리성 칼슘 이온 용출액을 제조한다.
When the degassed slag is charged into water, all of the calcium emulsion is dissolved, but the calcium oxide is partially dissolved, that is, the solubility of slaked lime is low, so that the sulfur component is eluted by charging the degassed slag into water. Thereafter, the sulfur eluate is separated and removed, and the remaining desulfurization slag is reacted with water again to prepare a strong alkaline calcium ion eluate in which the calcium component is eluted in an ionic state.

유황 및 칼슘 성분이 효과적으로 용출될 수 있도록 탈류 슬래그를 45㎛이하의 입자크기로 분쇄한다. 45㎛이하인 경우, 유황 및 칼슘성분이 보다 신속하고 효과적으로 용출된다.
The outflow slag is ground to a particle size of 45 μm or less so that sulfur and calcium components can be effectively eluted. When it is 45 micrometers or less, sulfur and a calcium component elute more quickly and effectively.

황은 물에 대한 용해도가 매우 커서 탈류 슬래그를 물에 첨가하고 교반하면 대부분의 황성분이 용출된다. 그 후, 황이 용출된 용출액을 슬래그에서 분리 제거한다. 이때 여과등 일반적인 방법으로 분리할 수 있다.
Sulfur has solubility in water that most of the sulfur components are eluted by adding and stirring the dewatering slag to water. Thereafter, the eluate in which sulfur is eluted is separated and removed from the slag. At this time, it can be separated by a common method such as filtration.

그 후, 황성분이 용출 제거된 탈류 슬래그를 물에 첨가하고 pH가 12이상인 고알칼리성이 되도록 조정하여 pH 12 이상의 칼슘이온 용출액을 제조한다. 상기 강알칼리성 칼슘 용출액에 이산화탄소 가스 혹은 이산화탄소 가스를 함유하는 배가스를 산기관을 통하여 잘 순산시키면서 취입하여 반응시키면, 흰색 침전물인 탄산칼슘이 생성되어 반응액이 우유빛으로 변한다. 이 때 얻어지는 백색 침전을 분리하여 탄산칼슘을 얻는다.
Thereafter, the desulfurization slag from which the sulfur component is eluted and removed is added to water and adjusted to a high alkalinity with a pH of 12 or more to prepare a calcium ion eluate having a pH of 12 or more. When the strong alkaline calcium eluate is blown and reacted with carbon dioxide gas or flue gas containing carbon dioxide gas well through an acid pipe, a white precipitate of calcium carbonate is formed, and the reaction solution turns milky. The white precipitate obtained at this time is separated to obtain calcium carbonate.

그러나, 이때 우유빛으로 변한 용액내에 이산화탄소 혹은 이산화탄소 함유 배 가스를 계속 주입하여 pH가 7 이하로 낮아지면서 생성된 탄산칼슘은 중탄산칼슘으로 재용해되어, 탄산칼슘 침전이 없어지면서 맑은 용액이 된다. 따라서, 중탄산칼슘으로 전환하지 않은 상태, 즉 탄산칼슘으로 존재하는 pH 영역에서 반응시키고 침전을 분리하여야 한다. 즉, 칼슘 이온 용출액과 이산화탄소 혹은 이산화탄소 함유 배가스의 반응시 pH를 7이상, 바람직하게는 8이상으로 유지하여야 한다.
However, at this time, the calcium carbonate produced by continuously injecting carbon dioxide or carbon dioxide-containing exhaust gas into the milky solution is lowered to pH 7 or less is redissolved into calcium bicarbonate, and the calcium carbonate precipitates to become a clear solution. Therefore, it is necessary to react and to separate the precipitate in a state in which it is not converted to calcium bicarbonate, that is, in the pH region where calcium carbonate is present. That is, when the calcium ion eluate reacts with carbon dioxide or carbon dioxide-containing flue gas, the pH should be maintained at 7 or higher, preferably 8 or higher.

본 발명에서는 탈류슬래그를 사용하여 강알칼리성 칼슘 이온 용출액을 제조함으로 종래 석회석에서 소석회유 제조시 발생되는 이산화탄소가 발생되지 않으며, 칼슘이온 용출액을 이용하여 탄산칼슘을 제조함으로 불순물의 혼입이 없는 99%이상의 고순도의 탄산칼슘을 얻을 수 있다. In the present invention, by producing a strong alkaline calcium ion eluate using de-flowing slag, carbon dioxide generated in the production of calcined lime oil is not generated in conventional limestone. High purity calcium carbonate can be obtained.                     

이하, 실시예를 통하여 본 발명에 대하여 보다 상세히 설명한다.
Hereinafter, the present invention will be described in more detail with reference to Examples.

<실시예 1><Example 1>

입자 크기가 45㎛이하인 탈류 슬래그를 물에 첨가하고 혼합하여 유황 성분을 용출시킨다. 유황 용출액과 탈류슬래그를 여과하여 분리하고, 유황성분이 용출, 제거된 탈류 슬래그를 물과 재차 반응시켜 강알칼리성의 칼슘이온 용출액을 을 제조하고 그 후 여과하여 용해되지 않은 탈류 슬래그와 칼슘이온 용출액을 분리한다.
The outflow slag having a particle size of 45 µm or less is added to water and mixed to elute the sulfur component. The sulfuric eluate and the degassed slag were separated by filtration, and the sulfuric acid eluted and removed degassed slag was reacted with water again to prepare a strong alkaline calcium ion eluate, and then filtered to remove the undissolved slag and calcium ion eluate. Separate.

pH 12이상인 칼슘이온 용출액 200ml를 비이커에 넣고 이산화탄소 가스를 분당 0.5l로 취입하였다. 취입하자마자 백색 탄산칼슘 침전물이 생성되어 pH 프로브(probe)가 보이지 않을 정도의 백탁으로 되었으며, 백탁용액에 계속 이산화탄소 가스를 취입하면 pH 7.08정도에서 탄산칼슘이 중탄산칼슘으로 재용해되어 백탁이 엷어지면서 프로브가 보이기 시작하였다. 따라서, 반응시 pH를 약 8정도로 유지하였다.
200 ml of calcium ion eluate having a pH of 12 or more was placed in a beaker and carbon dioxide gas was blown at 0.5 l per minute. As soon as the white calcium carbonate precipitate was formed, it became white turbid so that the pH probe was not visible. If carbon dioxide gas was continuously injected into the white turbid solution, the calcium carbonate was re-dissolved into calcium bicarbonate at pH 7.08 and the white turbid became thin. Started to appear. Therefore, the pH was maintained at about 8 during the reaction.

백색 탄산칼슘 침전물을 여과하여 탄산칼슘을 얻었다. 순도는 99.9%이상이었다.
The white calcium carbonate precipitate was filtered off to obtain calcium carbonate. Purity was over 99.9%.

<실시예 2><Example 2>

실시예 1과 동일한 방법으로 탈류슬래그중의 유황 성분을 유황 용출액으로 제거하였다. pH 12 이상인 칼슘이온 용출액 200ml를 비이커에 넣고 이산화탄소 가스를 분당 0.2l로 취입하였으며 이에 따라 백색 침전물이 형성되었다. 반응시 pH를 약 8로 유지하였다. 백색 탄산칼슘 침전물을 여과하여 탄산칼슘을 얻었으며, 순도는 99.9%이상이었다.
In the same manner as in Example 1, the sulfur component in the degassing slag was removed with a sulfur eluate. 200 ml of calcium ion eluate having a pH of 12 or more was placed in a beaker and carbon dioxide gas was blown at 0.2 l per minute, thereby forming a white precipitate. The pH was maintained at about 8 during the reaction. The white calcium carbonate precipitate was filtered off to obtain calcium carbonate, and the purity was over 99.9%.

<실시예 3><Example 3>

실시예 1과 동일한 방법으로 탈류 슬래그중의 유황성분을 유황 용출액을 제거하였다. pH 12 이상인 칼슘이온 용출액 200ml를 비이커에 넣고 이산화탄소 가스를 분당 0.3l로 취입하였으며, 이에 따라 백색 침전물이 형성되었다. 반응시 pH를 약 8로 유지하였다. 백색 탄산칼슘 침전물을 여과하여 탄산칼슘을 얻었으며, 순도는 99.9%이상이었다.
In the same manner as in Example 1, the sulfur component in the degassed slag was removed from the sulfur eluate. 200 ml of calcium ion eluate having a pH of 12 or more was placed in a beaker and carbon dioxide gas was blown at 0.3 l per minute, thereby forming a white precipitate. The pH was maintained at about 8 during the reaction. The white calcium carbonate precipitate was filtered off to obtain calcium carbonate, and the purity was over 99.9%.

<실시예 4><Example 4>

실시예 1과 동일한 방법으로 탈류 슬래그중의 유황성분을 유황 용출액을 제거하였다. pH 12 이상인 칼슘이온 용출액 200ml를 비커에 넣고 질소가스와 이산화탄소 가스를 9:1 중량비로 혼합한 인공배가스를 분당 0.2l로 취입하였다. 이에 따라 백색 침전물이 형성되었다. 반응시 pH를 약 8로 유지하였다. 백색 탄산칼슘 침전물을 여과하여 탄산칼슘을 얻었으며, 순도는 99.9%이상이었다.
In the same manner as in Example 1, the sulfur component in the degassed slag was removed from the sulfur eluate. 200 ml of calcium ion eluate having a pH of 12 or more was placed in a beaker, and the artificial flue gas mixed with nitrogen gas and carbon dioxide gas in a 9: 1 weight ratio was blown at 0.2 l per minute. This resulted in the formation of a white precipitate. The pH was maintained at about 8 during the reaction. The white calcium carbonate precipitate was filtered off to obtain calcium carbonate, and the purity was over 99.9%.

실시예 1-4에서 알 수 있는 바와 같이 유황성분이 제거된 탈류슬래그의 칼슘 용출액에 이산화탄소 혹은 이산화탄소 함유 배가스를 통과시키면 유량에 관계없이 pH 7 이상에서는 탄산칼슘이 생성됨을 알 수 있다.As can be seen in Example 1-4, when carbon dioxide or carbon dioxide-containing exhaust gas is passed through the calcium eluate of the desulfurized slag from which the sulfur is removed, it can be seen that calcium carbonate is formed at pH 7 or higher regardless of the flow rate.

본 발명의 방법에 의하면 폐기처분되고 있는 탈류 슬래그를 이용하여 고순도의 탄산칼슘이 제조된다. 또한, 이산화탄소 함유 배가스등이 이용됨으로 친환경적이다. According to the method of the present invention, calcium carbonate of high purity is produced by using the discharged slag which is disposed of. In addition, it is environmentally friendly because carbon dioxide-containing flue gas is used.

Claims (2)

탈류슬래그를 45㎛이하로 분쇄한 후 물에 첨가하여 유황성분이 용출시키고 유황성분이 용출된 유황용출액을 분리, 제거하는 단계;Pulverizing the demineralized slag to 45 μm or less, and then adding it to water to dissolve the sulfur component and to separate and remove the sulfur eluate from which the sulfur component is eluted; 물에 상기 유황용출액이 분리 제거된 탈류슬래그를 첨가하고 pH 12이상이 되도록 조정하여 pH 12이상의 칼슘 용출액을 얻는 단계; 및Adding a desulfurization slag from which the sulfur eluate is separated and removed to water and adjusting the pH to 12 or more to obtain a calcium eluate having a pH of 12 or more; And 상기 칼슘 용출액과 이산화탄소 혹은 이산화탄소 함유 배가스를 pH 7이상이 되도록 하여 반응시키는 단계;Reacting the calcium eluate with carbon dioxide or carbon dioxide-containing flue gas to pH 7 or higher; 를 포함하는 고순도 탄산칼슘 제조방법.High purity calcium carbonate production method comprising a. 제 1항에 있어서, 상기 탈류슬래그는 CaO 48-50중량%, SiO2 21-24중량%, Fe 0.5-1.5중량%, Al2O3 4-7중량%, MgO 2-5중량%, MnO 0.5-1.2중량%, S 0.7-1.8중량%, 및 FeO, Fe2O3, Ca(OH)2, CaCO3 및 CaSO4로 구성되는 그룹으로부터 선택된 최소 일종의 잔부를 포함함을 특징으로 하는 고순도 탄산칼슘 제조방법. According to claim 1, wherein the de-flow slag is 48-50% by weight of CaO, 21-24% by weight of SiO 2 , 0.5-1.5% by weight Fe, 4-7% by weight of Al 2 O 3 , MgO 2-5% by weight, MnO High purity carbonic acid, characterized in that it comprises at least a kind of residue selected from the group consisting of 0.5-1.2% by weight, 0.7-1.8% by weight S, and FeO, Fe 2 O 3 , Ca (OH) 2 , CaCO 3 and CaSO 4 Calcium manufacturing method.
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KR101225131B1 (en) 2011-02-25 2013-01-22 현대제철 주식회사 Apparatus for increasing calorific value of gas
KR101936809B1 (en) 2017-06-16 2019-01-09 한국해양대학교 산학협력단 A method for producing high purity calcium carbonate using indirect carbonation of alkaline industrial by-products and seawater

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