KR100388022B1 - Method of preventing white water from generating in LD slag for reformation material of soft ground - Google Patents
Method of preventing white water from generating in LD slag for reformation material of soft ground Download PDFInfo
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- KR100388022B1 KR100388022B1 KR10-1999-0060743A KR19990060743A KR100388022B1 KR 100388022 B1 KR100388022 B1 KR 100388022B1 KR 19990060743 A KR19990060743 A KR 19990060743A KR 100388022 B1 KR100388022 B1 KR 100388022B1
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- South Korea
- Prior art keywords
- converter slag
- slag
- molten
- cao
- foundry sand
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- 239000002893 slag Substances 0.000 title claims abstract description 72
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 16
- 239000000463 material Substances 0.000 title description 6
- 239000004576 sand Substances 0.000 claims abstract description 28
- 239000002699 waste material Substances 0.000 claims abstract description 25
- 238000002844 melting Methods 0.000 claims abstract description 4
- 230000008018 melting Effects 0.000 claims abstract description 4
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 239000013535 sea water Substances 0.000 abstract description 10
- 239000006227 byproduct Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 46
- 239000000292 calcium oxide Substances 0.000 description 23
- 235000012255 calcium oxide Nutrition 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 12
- 239000002244 precipitate Substances 0.000 description 11
- 229910004298 SiO 2 Inorganic materials 0.000 description 9
- 238000005266 casting Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 230000002378 acidificating effect Effects 0.000 description 4
- 239000000203 mixture Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000012535 impurity Substances 0.000 description 3
- 238000001556 precipitation Methods 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 2
- 239000000347 magnesium hydroxide Substances 0.000 description 2
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000002407 reforming Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000721047 Danaus plexippus Species 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N iron oxide Inorganic materials [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 235000019353 potassium silicate Nutrition 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Metallurgy (AREA)
- Ceramic Engineering (AREA)
- Analytical Chemistry (AREA)
- Structural Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
본 발명은 제철소의 부산물인 전로슬래그를 연약지반 개량 재하재용으로 사용하기 위한 방법에 관한 것으로, 그 목적은 전로슬래그가 해수와 반응하는 경우에 생성되는 백탁수를 방지하기 위하여 전로슬래그를 개질처리하는 방법을 제공함에 있다.The present invention relates to a method for using converter slag, a by-product of an ironworks, for improved loading of soft ground, and an object thereof is to reform a converter slag in order to prevent white turbid water generated when the converter slag reacts with seawater. In providing a method.
상기 목적을 달성하기 위한 본 발명은, 용융전로슬래그에 폐주물사를 10%이상(용융전로슬래그의 중량에 대하여) 투입하여 폐주물사를 용융하여 혼합한 다음, 냉각하는 것을 포함하여 이루어지는 연약지방개량 재하재용 전로슬래그의 백탁수 생성방지방법에 관한 것을 그 기술적요지로 한다.In order to achieve the above object, the present invention provides a soft fat-improving load comprising melting and mixing waste foundry sand by adding 10% or more of the waste foundry sand to the molten converter slag (relative to the weight of the molten furnace slag). The technical gist of the method for preventing the production of turbid water of recycle converter slag is assumed.
Description
본 발명은 제철소의 부산물인 전로슬래그를 연약지반 개량 재하재용으로 사용하기 위한 방법에 관한 것으로, 보다 상세하게는 전로슬래그가 해수와 반응하는 경우에 생성되는 백탁수를 방지하기 위하여 전로슬래그를 개질처리하는 방법에 관한 것이다.The present invention relates to a method for using converter slag, a by-product of an ironworks, for improved loading of soft ground. More specifically, the converter slag is reformed to prevent cloudy water generated when the converter slag reacts with seawater. It is about how to.
제철소의 제강공정에서는 용선에 포함된 불순물을 제거하기 위하여 산소를 취련하면서 생석회 등의 부원료를 투입하는데, 이때 용선중의 불순물인 Si, P, S 등이 산화반응하면서 전로슬래그가 다량 발생된다. 이 용융전로슬래그는 슬래그배재장으로 배재하여 냉각하는데, 현재 일부는 자원 재활용 측면에서 재활용되고 있다. 그러나, 상당량이 매립되고 있는 실정으로, 매립지 확보가 점차 어려워지므로 이를 해결하기 위해 새로운 재활용 방안을 개발하기 위한 많은 연구가 이루어지고 있다.In the steelmaking process of steel mills, subsidiary materials such as quicklime are input while blowing oxygen to remove impurities contained in molten iron. At this time, a large amount of converter slag is generated as the impurities in the molten iron are oxidized, such as Si, P, and S. The molten converter slag is discharged into a slag plant and cooled, some of which are now recycled in terms of resource recycling. However, since a considerable amount of landfill is being secured, it is becoming increasingly difficult to secure landfills, and many studies have been conducted to develop new recycling methods to solve this problem.
최근에는, 전로슬래그를 해양분야에 재활용하려는 관심이 높아지고 있으며, 그 일환으로 연약지반 개량재로서 사용가능성이 검토되고 있다. 연약지반개량에도 여러 공법이 있으며, 가장 많이 사용되는 공법이 모래 말뚝 공법이다. 이 공법에서는 연약지반 토내에 포함된 물을 배출시키기 위해서 하중을 걸어주는 재하층이 있다. 이 층은 보통 왕사로 둑형태를 만들어서 하중을 걸어준다. 그런데, 이 왕사도 전로 슬래그보다는 고가이기 때문에, 이를 폐기물인 전로슬래그로 대체하기 위한 연구가 각별한 관심속에서 진행되고 있다.In recent years, the interest to recycle the converter slag in the marine field is increasing, and as part of it, the possibility of using it as a soft ground improvement material is examined. There are several methods for improving the soft ground, and the most used method is sand pile method. In this process, there is a loading layer under load to drain the water contained in the soft soil. This layer is usually a monarch and weirs are loaded. However, since this royal palace is also more expensive than converter slag, research to replace it with waste converter slag is proceeding with particular interest.
그런데, 전로슬래그를 연약지반개량 재하재로 사용하는 경우에는 백색침전이 생기는 문제가 있다. 즉, 모래말뚝의 하중에 의해 모래말뚝 사이로 올라온 해수는 재하재인 전로 슬래그와 접촉하게 되는데, 이때 전로슬래그에 다량 함유된 CaO로 부터 용출되는 Ca성분이 해수중의 CO2와 반응하게 되어 CaCO3의 백색침전이 생성된다. 또 CaO가 용해하여 생성된 Ca(OH)2가 해수속의 마그네슘 이온과 반응하면 백색의 수산화마그네슘이 생성되는데, 이 수산화마그네슘과 CaCO3가 백색침전이므로 이들을 백탁수라고 칭한다.However, when the converter slag is used as a soft ground improvement material, there is a problem that white precipitate occurs. That is, there is that by weight of the sand pile water put between the sand pile is in contact with the load recognition converter slag, wherein the Ca component to be eluted from the large amount contained CaO in converter slag is reacted with CO 2 in seawater of CaCO 3 White precipitates are produced. When Ca (OH) 2 produced by dissolving CaO reacts with magnesium ions in seawater, white magnesium hydroxide is produced. Since magnesium hydroxide and CaCO 3 are white precipitates, these are called white turbid water.
본 발명자들은 한국 특허출원번호 1998-57609호에 용융전로슬래그에 공기를 분사하여 전로슬래그내 Fe와 FeO성분을 Fe2O3로 만들고, Fe2O3로 CaO를 안정화시켜서 백탁수의 생성을 방지하는 방법을 출원한 바 있다. 본 발명은 한국 특허출원번호1998-57609호에 연속하여 전로슬래그의 백탁수의 생성을 방지하고자 하는 일련의 연구과정에서 새로운 기술을 완성하여 본 발명을 제안하게 이르렀다.The present inventors inject the air to the molten converter slag in Korean Patent Application No. 1998-57609 to make Fe and FeO components in the converter slag to Fe 2 O 3 , stabilize the CaO with Fe 2 O 3 to produce the white turbid water It has applied for a method of preventing. The present invention has been completed in a series of research procedures to prevent the generation of turbid water of converter slag in accordance with the Korean Patent Application No. 1998-57609 to come to propose the present invention.
이러한 본 발명의 목적은 전로 슬래그의 성분을 변경시키는 개질처리를 통해 전로 슬래그의 백탁수 생성방지방법을 제공함에 있다.An object of the present invention is to provide a method for preventing the formation of turbid water of the converter slag through the reforming treatment to change the components of the converter slag.
상기 목적을 달성하기 위한 본 발명의 연약지방개량 재하재용 전로슬래그의 백탁수 생성방지방법은, 용융전로슬래그에 폐주물사를 10%이상(용융전로슬래그의 중량에 대하여) 투입하여 폐주물사를 용융하여 혼합한 다음, 냉각하는 것을 포함하여 구성된다.In the method of preventing white turbid water generation of the converter slag for the soft fat-improving recharging for achieving the above object, the waste casting sand is melted by adding 10% or more of the waste casting sand (to the weight of the melting furnace slag) to the melting converter slag. Mixing and then cooling.
이하, 본 발명을 상세히 설명한다.Hereinafter, the present invention will be described in detail.
제철소의 산업부산물인 전로슬래그는 전로조업방법에 따라 다소의 차이는 있으나, 통상 아래 표 1과 같은 조성을 갖는다.The converter slag, an industrial by-product of the steel mill, has some differences depending on the converter operation method, but usually has a composition as shown in Table 1 below.
표 1에 나타낸 바와같이, 전로 슬래그중에는 CaO, FeO, SiO2등이 가장 많이함유되어 있으며, 이중 CaO성분이 백탁수의 발생원이다. 보통 전로슬래그의 염기도는 대략 3정도로, CaO가 SiO2성분 보다 많다. 따라서, 용융전로슬래그가 냉각되면 미반응 CaO가 존재하게 되어 CaO의 활성이 높아지는데, 이 전로슬래그가 해수와 접촉하면 Ca가 용출되게 된다. 따라서, CaO의 활성을 낮추어 주면, 미반응 CaO가 줄어들거나 없어지게 되므로, CaO를 안정한 화합물을 만들어 활성을 낮추는 방법이 검토될 수 있다. 물론, 전로슬래그중의 Fe2O3는 약산성 산화물이므로 CaO와 반응하여 2CaOㆍFe2O3를 형성하여 CaO를 안정화시키기도 하지만, 이것만으로는 CaO를 충분히 안정화시킬 수 없다. 또한, FeO는 약 염기성이므로 같은 염기성인 CaO와 안정한 화합물을 생성하는 것이 산성 산화물에 비해서 어렵다.As shown in Table 1, among the converter slag, CaO, FeO, SiO 2 and the like are most contained, of which CaO component is the source of turbid water. Usually the basicity of the converter slag is to approximately 3, CaO is greater than the SiO 2 component. Therefore, when the molten converter slag is cooled, unreacted CaO is present and CaO activity is increased. When the slag is in contact with seawater, Ca is eluted. Therefore, if the activity of CaO is lowered, the unreacted CaO is reduced or disappeared, so a method of reducing the activity by making a stable compound of CaO can be examined. Of course, since Fe 2 O 3 in the converter slag is a weakly acidic oxide, it may react with CaO to form 2CaO.Fe 2 O 3 to stabilize CaO, but this alone cannot sufficiently stabilize CaO. In addition, FeO is weakly basic, so it is more difficult to produce a stable compound with the same basic CaO compared to an acidic oxide.
이러한 연유로 전로슬래그는 CaO의 활성이 높은 상태이다. 따라서, 본 발명자들은 CaO의 활성을 낮추기 위한 산성산화물을 검토하던중에 폐주물사를 주목하게 되었다. 원래 주물사는 용융금속을 주입 응고시켜서 소정의 형태로 만드는 주형의 원료로서, SiO2함량이 대략 92% 이상 함유되며 용도에 따라 물유리, 탄소, 점토 등의 불순물이 약간 혼입된다. 이 주물사를 주형의 원료로 사용한 다음에 발생하는 폐주물사에도 SiO2함량이 여전히 높은 상태이며, 염가로 구할 수 있다.For this reason, the converter slag has a high activity of CaO. Therefore, the present inventors came to pay attention to the waste foundry sand while examining an acid oxide for lowering the activity of CaO. Originally, foundry sand is a raw material of a mold made by injection-solidifying molten metal into a predetermined form, and contains about 92% or more of SiO 2 and slightly contains impurities such as water glass, carbon, and clay, depending on the purpose. The waste found sand produced after using this foundry sand as a raw material of the mold still has a high SiO 2 content and can be obtained at low cost.
본 발명에서는 이러한 폐주물사를 용융전로슬래그에 혼합하여 전로슬래그중의 CaO을 2CaO·SiO2또는 3CaO·SiO2로 안정화시켜 CaO가 Ca(OH)2로 생성되는 것을 방지하여 백탁수의 생성을 방지하는데, 특징이 있다.In the present invention, prevents to a mixture of the slag for such Waste Foundry Sand as melt before stabilizing the CaO in the converter slag as 2CaO · SiO 2 or 3CaO · SiO 2 CaO is produced with Ca (OH) 2, avoiding the generation of a number of opaque There is a characteristic.
이를 위해서는, 본 발명에 따라 용융전로슬래그에 폐주물사를 투입하여 폐주물사를 용융하여 균일하게 혼합한다, 본 발명에 적용되는 용융전로슬래그는 제철소의 제강공정에서 발생되는 것이면 가능하며, 발생하는 전로슬래그가 냉각되기 전에 폐주물사를 투입한다. 용융전로슬래그에 폐주물사를 투입하면 폐주물사가 용융되어 CaO/SiO2의 비가 낮아지므로 슬래그의 유동성이 높아져 균일하게 혼합된다. 본 발명의 실험결과에 따르면, 폐주물사의 투입량은 용융전로슬래그의 중량에 대해 10%이상으로 하면 백탁수의 생성이 방지되는 결과를 얻었다. 본 발명에서 용융전로슬래그에 투입되는 폐주물사의 양이 많아진다고 해서 백탁수의 생성방지에 역효과를 내는 것은 아니며, 다만 너무 많은 양의 첨가는 용융전로슬래그의 온도를 떨어뜨리는 문제가 생길 수 있다. 이 경우 폐주물사를 가열하여 투입하면 크게 문제될 것은 없다. 물론, 냉각된 전로슬래그와 폐주물사를 혼합하고 이들을 1350℃이상의 고온으로 가열하여 용융시키거나 또는 냉각된 전로슬래그만 가열하여 용융시키고 여기에 폐주물사를 투입할 수 있으나, 경제성측면에서 바람직하지 않다.To this end, the waste casting sand is put into the molten converter slag according to the present invention to melt the waste casting sand and mix uniformly. The molten converter slag to be applied to the present invention may be generated in a steelmaking process of a steel mill, and the converter slag is generated. The waste foundry sand is introduced before cooling. When the waste foundry sand is put into the molten converter slag, the waste foundry sand is melted and the ratio of CaO / SiO 2 is lowered, thereby increasing the fluidity of the slag and mixing it uniformly. According to the experimental results of the present invention, when the input amount of the waste foundry sand is 10% or more based on the weight of the molten converter slag, the production of white turbid water was prevented. In the present invention, the increase in the amount of waste foundry injected into the molten converter slag does not adversely affect the prevention of the formation of white turbid water, but the addition of too much amount may cause a problem of lowering the temperature of the molten converter slag. . In this case, there is no big problem if the waste foundry sand is heated and added. Of course, the cooled converter slag and the waste casting sand may be mixed and melted by heating them to a high temperature of 1350 ° C. or higher, or only the cooled converter slag may be heated and melted, and the waste casting sand may be added thereto, but it is not preferable in terms of economy.
상기와 같이 용융전로슬래그와 폐주물사를 균일하게 혼합한 다음에, 용융전로슬래그를 슬래그 배재장에 배재하는 통상의 방법에 따라 냉각한다. 냉각하여 얻어지는 전로슬래그와 폐주물사는 분쇄 및 소정입도로 분급하여 연약지방개량 재하재로 사용하면 된다.As described above, the molten converter slag and the waste casting sand are mixed uniformly, and then the molten converter slag is cooled according to a conventional method of disposing the molten converter slag in the slag distribution site. The converter slag and waste foundry sand obtained by cooling may be used as a soft fat-improving material by crushing and classifying to a predetermined particle size.
한편, 용융전로슬래그에 약산성 산화물인 Fe2O3를 다량 첨가하여도 CaO는 안정화될 수 있지만, Fe2O3는 약산성이므로 SiO2에 비해 다량 첨가하여야 하고 첨가량이 증가하면 슬래그가 무거워지는 단점이 있다.On the other hand, CaO can be stabilized even when a large amount of weakly acidic Fe 2 O 3 is added to the molten converter slag. However, Fe 2 O 3 is weakly acidic, so it must be added in a large amount compared to SiO 2 and the slag becomes heavy when the amount is increased. There is this.
이하, 본 발명을 실시예를 통하여 보다 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.
[비교예 1]Comparative Example 1
제철소에서 채취한 입도가 각각 8mm 이하, 8∼15mm 및 15mm 이상인 전로 슬래그를 비이커에 넣고 바닷물에 침지해두었다. 약 30분 후부터 백색침전이 생성되기 시작하였다. 시간경과에 따른 바닷물의 pH 변화와 백색침전 형성결과를 표 2에 나타내었다.Converter slag with particle size of 8mm or less, 8-15mm and 15mm or more, respectively, was put in a beaker and immersed in seawater. After about 30 minutes white precipitates began to form. Table 2 shows the pH change and white precipitate formation results over time.
표 2에 나타낸 바와 같이, 전로 슬래그는 바닷물의 pH 범위인 8.0-8.2 보다알칼리성이 강하며, 입도가 미세할수록 백색침전이 많이 발생하고 알칼리성이 강한 용액을 용출한다는 것을 알 수 있다.As shown in Table 2, the converter slag is more alkaline than the pH range of 8.0-8.2, and it can be seen that the finer the particle size, the more white precipitate occurs and the higher the alkaline solution is eluted.
[실시예 1]Example 1
비교예 1에서 사용한 것과 동일한 전로 슬래그를 사용하여 전로 슬래그를 다음과 같이 개질하였다. 상기 전로 슬래그에 폐주물사를 3%, 5%, 10% 첨가하고 균일하게 혼합한 후에 용해로에 넣고 LPG 로서 1350℃ 이상으로 재용융하고 용융된 스래그는 통상의 냉각방법과 같이 슬래그장 위에 흘려서 냉각시켰다. 이와같이 개질 처리된 전로 슬래그를 비이커에 넣고 바닷물을 투입하여 시간경과에 따른 pH 변화 및 백색 침전발생상황을 표 3에 나타내엇다.The converter slag was modified as follows using the same converter slag used in Comparative Example 1. 3%, 5%, and 10% of the waste foundry sand was added to the converter slag, mixed homogeneously, re-melted at 1350 ° C or higher as LPG, and the molten slag was cooled by flowing over the slag field as in the conventional cooling method. . The reformed converter slag was added to the beaker and the seawater was added, and the pH change and the white precipitation occurrence state over time are shown in Table 3.
표 3에 나타낸 바와 같이, 개질 처리된 전로 슬래그는 용출물의 pH 가 바닷물 pH 보다 약간 알칼리성이 센것으로 보아 바닷물 pH 에는 크게 영향을 미치지 않으며 특히 폐주물사가 10% 이상이면 백색침전도 발생되지 않았다.As shown in Table 3, the modified slag of the modified treated slag was slightly alkaline than the pH of the seawater, so it did not significantly affect the seawater pH. Especially, if the waste foundry sand was more than 10%, white precipitate did not occur.
상술한 바와 같이, 본 발명에서는 폐주물사를 적극적으로 이용하는 전로슬래그의 개질방법에 의해 전로슬래그를 연약지반 개량용 재하재로 사용할 수 있으며, 본 발명에 따라 개질된 전로슬래그는 해수의 pH 에도 영향을 주지 않으며 백탁수 생성도 방지할 수 있는 유용한 효과가 있다.As described above, in the present invention, the converter slag can be used as a loading material for improving the soft ground by the reforming method of the converter slag actively using the waste casting sand, and the converter slag modified according to the present invention does not affect the pH of the seawater. It also has a useful effect that can prevent the formation of turbid water.
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