KR100231506B1 - Producing method of the sleeve for the thermoelectric couple - Google Patents

Producing method of the sleeve for the thermoelectric couple Download PDF

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KR100231506B1
KR100231506B1 KR1019970024232A KR19970024232A KR100231506B1 KR 100231506 B1 KR100231506 B1 KR 100231506B1 KR 1019970024232 A KR1019970024232 A KR 1019970024232A KR 19970024232 A KR19970024232 A KR 19970024232A KR 100231506 B1 KR100231506 B1 KR 100231506B1
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slag
sleeve
thermocouple
steelmaking
raw material
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KR1019970024232A
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KR19990001035A (en
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오명환
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오명환
주식회사서울암면
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    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/14—Waste materials; Refuse from metallurgical processes
    • C04B18/141—Slags
    • C04B18/142—Steelmaking slags, converter slags
    • 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
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • 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
    • F27D11/00—Arrangement of elements for electric heating in or on furnaces

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Civil Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Compositions Of Oxide Ceramics (AREA)

Abstract

본 발명은 제철 또는 제강분야에서 고로 또는 전기로 등에 용융된 용강이나 용선의 온도측정 또는 성분분석 등의 목적으로 사용되는 열전대의 보호관인 열전대 슬리브의 제조방법에 관한 것으로서, 기존의 열전대 슬리브에 비해 내침식성이 우수하고 제조가격이 저렴한 제품을 제조하는 것을 그 목적으로 한 것이다.The present invention relates to a method of manufacturing a thermocouple sleeve, which is a protective tube of a thermocouple used for the purpose of temperature measurement or component analysis of molten steel or molten iron melted in a blast furnace or an electric furnace in the field of steelmaking or steelmaking, compared to conventional thermocouple sleeves. The purpose is to produce a product having excellent erosion and low manufacturing price.

본 발명은 슬리브 제조 원료 중 주원료로 사용되는 섬유상의 내화 단열재로 제철 폐기물인 슬래그를 섬유화한 슬래그울을 사용하고 부원료중 충진제로 상기 슬래그를 분말화 한 슬래그 분말을 사용하여 압출성형 또는 진공흡착성형방식에 의해 제조되는 것을 특징으로 한 것이며, 이와 같이 제조된 열전대 슬리브는 용강이나 용선에 침적시 내침식성과 내오염성이 탁월하고 가격이 저렴한 등의 유용한 효능을 지닌다.The present invention uses a slag wool fibrous steel slag as a raw material of the raw material in the manufacture of the sleeve as a fiber fire-resistant insulation, and using the slag powder powdered the slag as a filler in the secondary raw material by extrusion molding or vacuum adsorption molding method The thermocouple sleeve manufactured as described above has a useful effect such as excellent corrosion resistance and stain resistance and low price when deposited on molten steel or molten iron.

[색인어][Index]

열전대, 슬리브, 보호관, 제철, 제강Thermocouple, sleeve, protective tube, steelmaking, steelmaking

Description

열전대 슬리브 제조방법{Producing method of the sleeve for the thermoelectric couple}Producing method of the sleeve for the thermoelectric couple}

본 발명은 제철 또는 제강분야에서 고로, 전기로 등에 용해된 용강이나 용선과 같은 용융물의 온도, 용존산소량, 카본 등의 측정이나 성분분석을 위한 쌤플링을 목적으로 사용되는 열전대의 보호관인 열전대 슬리브의 제조방법에 관한 것으로서, 좀더 상세히는, 제철폐기물인 슬래그를 섬유화하여 얻어지는 슬래그울을 주성분으로 하고 슬래그를 분말화한 슬래그분말을 충진제로 하여 기타 부원료들과 혼합후 주지의 공정을 거쳐 제조되는 열전대 슬리브의 제조방법에 관한 것이다.The present invention relates to a thermocouple sleeve, which is a protective tube for thermocouples used for the purpose of sampling or for the analysis of the temperature, dissolved oxygen, carbon, etc. of molten steel or molten iron dissolved in blast furnaces, electric furnaces, etc. in elemental steelmaking or steelmaking. The present invention relates to a manufacturing method, and more particularly, a thermocouple sleeve manufactured through a well-known process after mixing with other subsidiary ingredients by using slag powder obtained by fiberizing slag, which is steel waste, as a main component, and slag powder powdered slag as a filler. It relates to a manufacturing method of.

일반적으로 용강이나 용철의 온도는 1700-1800℃가량의 고온이므로 온도측정 등을 목적으로 한 열전대를 침적시 열전대의 열노화방지 또는 내침식성향상과 스플래쉬 방지를 위하여 내열보호관인 슬리브를 장착하여 사용하는데, 따라서 이때 사용되는 슬리브는 내열성과 내침식성이 특히 우수하여 침적중에 소실되지 않는 특성을 지닌 재료로 제조되는 것이 필수적이다.In general, the temperature of molten steel or molten iron is about 1700-1800 ℃, so when the thermocouple for temperature measurement is immersed, it is used by installing a sleeve that is a heat-resistant protective tube to prevent thermal aging of the thermocouple or to improve corrosion resistance and splash prevention. Therefore, it is essential that the sleeve used at this time is made of a material having properties that are particularly excellent in heat resistance and erosion resistance and do not disappear during deposition.

종래에는 이러한 열전대 슬리브로 아스베스토스(석면)나 세라믹 섬유를 주성분으로 한 슬리브가 주로 사용되었으나, 아스베스토스 슬리브는 가격이 저렴한 장점이 있는 반면에 내열성과 내침식성이 나쁘기 때문에 침적시 소실되기 쉬워 용융물을 오염시키거나 스플래쉬(splash)를 발생시키고 또한 환경오염과 같은 문제점이 있으며, 알루미나실리카계 세라믹 섬유를 주성분으로 한 슬리브는 내열성은 우수하나 내침식성에서 SiO2가 용출되어 용융물을 오염시키는 문제점과 제조가격이 비교적 높은 단점이 있다.Conventionally, such thermocouple sleeves are mainly made of asbestos (asbestos) or ceramic fiber-based sleeves. However, asbestos sleeves have the advantage of being inexpensive, while they are easily lost due to poor heat resistance and corrosion resistance and contaminate the melt. Or splash, and also environmental pollution. The sleeve which is mainly composed of alumina silica-based ceramic fiber has excellent heat resistance, but SiO 2 is eluted from erosion resistance to contaminate the melt and the manufacturing price is relatively low. There is a high disadvantage.

본 발명은 상기와 같은 종래의 열전대 슬리브의 문제점을 해결하기 위해 안출된 것으로서, 용강이나 용철의 온도관리나 성분측정용 열전대의 보호관으로 사용되는 슬리브의 재료로서 대부분 산업용 폐기물로 처리되고 있는 제철폐기물인 슬래그를 섬유화한 슬래그울을 주성분으로 하고 슬래그분말 및 기타 부재료를 사용하여 제조함으로써 내열성 및 내침식성이 우수함은 물론 내오염성이 탁월하고 제조가격이 저렴한 효능을 지닌 열전대 슬리브를 제공하는 것을 그 목적으로 한 것이다.The present invention has been made to solve the problems of the conventional thermocouple sleeve as described above, which is a steel waste material that is mostly treated as industrial waste as a material of the sleeve used as a protective tube for temperature control or component measurement of molten steel or molten iron. Its main purpose is to provide thermocouple sleeves with excellent heat resistance and erosion resistance as well as excellent stain resistance and low cost by making slag fiber made of fibrous slag and using slag powder and other materials. will be.

상기와 같은 목적을 달성하기 위한 본 발명은 주원료인 섬유상의 내화 단열재와 부원료인 내화충진제, 결합제 및 기타 보조재료를 압출성형 또는 진공흡착성형에 의해 제조되는 공지의 열전대 슬리브 제조에 있어서, 내화단열재로 제철폐기물인 슬래그를 섬유화하여 얻어지는 슬래그울 슬리브 원료중 고형분 총량의 40-90중량% 범위에서 사용하고 내화충진제로 슬래그를 분말화하여 얻어지는 슬래그 분말을 슬리브원료중 고형분 총량의 5-20중량% 범위에서 사용하는 것을 특징으로 한열전대 슬리브 제조방법에 관한 것으로서, 이하에서 본 발명을 구체적으로 설명한다.The present invention for achieving the above object is in the manufacture of a known thermocouple sleeve manufactured by extrusion molding or vacuum adsorption of the fibrous refractory insulating material and the secondary raw material refractory fillers, binders and other auxiliary materials as a refractory insulating material, Slag powder obtained by fiberizing slag, which is steel waste, is used in the range of 40-90% by weight of the total amount of solids in the raw material of slag wool, and slag powder obtained by pulverizing slag with the refractory filler is in the range of 5-20% by weight of the total amount of solids in the raw material of the sleeve. The present invention relates to a method of manufacturing a thermocouple sleeve, which will be described below.

일반적으로 제철이나 제강산업에서 사용되는 열전대 슬리브는 아스베스토스 또는 세라믹 섬유와 같은 섬유상의 내화단열재를 적당한 크기로 절단한 것을 주원료로 하고 여기에 부원료로 내화충진제, 유기 또는 무기의 결합제 및 기타 물성향상을 위해 선택적으로 사용될 수 있는 보조재료를 사용하여 공지의 압출성형방식 또는 진공흡착성형방식에 의해 제조된다.In general, thermocouple sleeves used in the steelmaking or steelmaking industry are mainly made of a cut of fibrous refractory insulation materials such as asbestos or ceramic fibers to an appropriate size, and are used as auxiliary materials to improve the retardant fillers, organic or inorganic binders, and other physical properties. It is produced by known extrusion molding or vacuum adsorption molding using auxiliary materials which can be optionally used.

본 발명에서는 주원료인 내화단열재로 제철폐기물인 슬래그를 섬유상으로 제조한 스래그울을 사용하는 것을 주요 특징부로 하는데, 이러한 슬래그울은 주로 SiO2와 CaO를 주성분으로 하고 기타 성분으로 Al2O3, Fe2O3, MgO등이 소량 함유된 조성의 슬래그에 소량의 성분조정용 원료를 혼합후 통상의 섬유제조장치에 의해 넣어 제조된다. 이와 같은 슬래그울은 산업폐기물의 재활용이라는 긍정적인 측면외에도 단열효과가 우수하고 흡수율이 낮으며, 특히 열전대 슬리브로 사용되는 경우 1700-1800℃의 고온인 용강 또는 용선에 침적시 용융되더라도 슬리브 성분이 슬래그 성분과 유사하기 때문에 쉽게 재슬래그화하여 용융물을 오염시키지 않는 특성을 발휘하는 장점을 지닌다.In the present invention, the main raw material is to use the slag wool made of steel waste slag as the main material of the fire-resistant insulation material, the slag wool is mainly composed of SiO 2 and CaO and other components Al 2 O 3 , After mixing a small amount of the raw material for ingredient adjustment into a slag of a composition containing a small amount of Fe 2 O 3 , MgO, etc., it is produced by a conventional fiber manufacturing apparatus. In addition to the positive aspects of industrial waste recycling, such slag wool has excellent thermal insulation effect and low water absorption. Especially, when used as a thermocouple sleeve, the sleeve component is slag even when molten when deposited in molten steel or molten iron at a high temperature of 1700-1800 ℃. Because of its similarity to the component, it has the advantage of being easily reslagized to not contaminate the melt.

본 발명에서는 상기 슬래그울을 슬리브 제조원료의 총 고형분 대비 40-90 중량% 사용하는데, 40 중량% 미만으로 사용시는 내침식성이 떨어지고 열전도율이 높아지며 90 중량%초과 사용하는 경우에는 혼련작업이나 성형시 작업성이 나쁘게 되는 문제점이 발생한다.In the present invention, the slag wool is used 40-90% by weight relative to the total solids of the raw material for the sleeve, when less than 40% by weight is less corrosion resistance and higher thermal conductivity, when used in excess of 90% by weight kneading or molding work The problem is that the sex is bad.

또한, 본 발명에서는 부원료로 사용되는 충진제로 기존에 사용되는 알루미나 분말이나 뮤라이트 등을 사용할 수도 있으나, 전술한 바와 같은 효능을 지닌 슬래그를 분말화한 슬래그분말을 슬리브 원료중 고형분 총량의 5-20 중량% 사용하는 것이 본 발명의 목적에 좀 더 부합되는데, 이때 5 중량% 미만으로 사용하는 경우에는 충진효과가 미미하고 2 중량% 초과시는 내침식성이 떨어지거나 열전도율이 높아지는 문제점이 발생한다.In addition, in the present invention, alumina powder or mulite, which are conventionally used, may be used as a filler used as an auxiliary material, but the slag powder powdered slag having the above-described efficacy may be 5-20 of the total amount of solids in the raw material of the sleeve. The use of the weight% is more suitable for the purpose of the present invention, in which the use of less than 5% by weight, the filling effect is insignificant, and when more than 2% by weight, there is a problem that the corrosion resistance is lowered or the thermal conductivity is increased.

한편, 본 발명에서는 슬래그울과 충진제의 결착을 위해 사용되는 결합제로 대략 10% 내외의 수용액으로 되어 있는 콜로이달실리카, 알루미나졸, 규산소오다등과 같은 무기결합제와 폴리비닐알콜, 카르복시메틸셀룰로오스, 메틸셀룰로오스 등의 유기결합제를 단독 또는 2이상 혼합하여 사용하며, 그 사용량은 슬리브원료중총 고형분에 대하여 각각 3-10 중량% 범위에서 사용하는 것이 바람직하다.Meanwhile, in the present invention, an inorganic binder such as colloidal silica, alumina sol, sodium silicate, polyvinyl alcohol, carboxymethyl cellulose, which is an aqueous solution of about 10% as a binder used for binding the slag wool and the filler, Organic binders such as methyl cellulose are used alone or in combination of two or more thereof, and the amount of the organic binder is preferably used in a range of 3 to 10% by weight based on the total solids in the sleeve raw material.

상기와 같은 원료들은 선택적으로 첨가될 수 있는 기타 보조재료 또는 희석용 물을 첨가하여 압출방식 또는 진공흡착방식의 공지의 제조공정을 거쳐 열전대슬리브가 제조된다. 압출방식은 구체적으로 주원료인 섬유상의 슬래그울을 적당한 크기로 절단하여 충진제, 결합제 등의 부원료와 균일하게 혼합한 것을 중공부가 형성되도록 되어 있는 원형노즐을 선단부에 지닌 압축성형기에 넣고 압출성형을 행한후 최종적으로 가공절단 및 건조공정을 거쳐 제조되는 방식을 말하며, 진공흡착방식은 섬유상의 슬래울을 적당한 크기로 절단한 후 적당량의 물에 풀어 해리시킨 것을 부원료들과 혼합하여 진공흡착기와 슬리브 형상의 금형이 부착된 진공성형기에 넣어 진공흡착성형을 행한후 건조공정을 거쳐 제조되는 방식을 말하는 것이다.Such raw materials are thermocouple sleeves manufactured through known manufacturing processes of extrusion or vacuum adsorption by adding other auxiliary materials or water for dilution, which may be optionally added. Specifically, the extrusion method cuts fibrous slag wool, which is the main raw material, into an appropriate size and uniformly mixes it with sub-materials such as fillers and binders, and puts a circular nozzle in which a hollow part is formed in a compression molding machine having a tip, and performs extrusion molding. Finally, it refers to a method that is manufactured through processing cutting and drying process. The vacuum adsorption method cuts the fibrous slab to an appropriate size and dissociates it in an appropriate amount of water to dissociate it with subsidiary materials to form a vacuum absorber and a sleeve-shaped mold. It refers to a method of manufacturing through a drying process after performing vacuum adsorption molding into the attached vacuum molding machine.

이하에서 실시예를 들어 본 발명을 좀 더 구체적으로 설명한다.Hereinafter, the present invention will be described in more detail with reference to Examples.

[실시예1]Example 1

제철폐기물인 슬래그(성분조성 : SiO245%, CaO 39%, Al2O310%, Fe2O33%, MgO 2%, 기타 1%)를 섬유화하여 얻어진 스르그울 55kg을 대략 10-15mm의 크기로 절단한 것을 상기와 동일한 조성의 슬래그를 100메쉬 이하로 분쇄한 슬래그분말 15kg, 10%수용액의 콜로이달실리카 60kg 및 폴리비닐알콜 5kg55 kg of slug wool obtained by fiberizing slag (component composition: SiO 2 45%, CaO 39%, Al 2 O 3 10%, Fe 2 O 3 3%, MgO 2%, other 1%), which is steel waste 15 kg of slag powder, crushed to 15 mm in size, to below 100 mesh, 60 kg of colloidal silica of 10% aqueous solution and 5 kg of polyvinyl alcohol

을 블래드형 혼련기로 된 믹서기에 넣어 10분간 혼련하였다. 이 혼련물을 내경 35mm의 원형노즐의 내부 중앙에 외경 25mm의 원형봉이 배치된 압출노즐을 지닌 압출성형기에 넣어 압출속도를 0.5m/min의 속도로 하여 두께 10mm의 슬리브를 성형하고 30cm의 크기로 절단한 후 전기식 열풍건조기에서 110℃로 6시간 건조하여 열전대 보호용 슬리브를 제작하였다.Was added to a blender made of a blade kneader and kneaded for 10 minutes. The kneaded product was put into an extruder having an extrusion nozzle with a circular rod having an outer diameter of 25 mm at the inner center of a circular nozzle having an inner diameter of 35 mm, and a sleeve having a thickness of 10 mm was formed at an extrusion speed of 0.5 m / min and a size of 30 cm. After cutting for 6 hours at 110 ℃ in an electric hot air dryer to prepare a thermocouple protective sleeve.

[실시예 2]Example 2

실시예 1과 동일한 조성의 슬래그울 55kg을 대략 10-15mm의 크기로 절단하여 물 50kg에 풀어 해리시킨 것을 실시예 1과 동일한 성분 및 양으로 된 충진제 및 유, 무기결합제와 함께 믹서기에 넣어 혼합하여 얻어진 슬러리를 외경 25mm 길이 30cm의 크기로 절단한 후 전기식 열풍건조기에서 110℃로 6시간 건조하여 열전대 보호용 슬리브를 제작하였다.55 kg of slag wool having the same composition as in Example 1 was cut to a size of about 10-15 mm, dissociated in 50 kg of water, and dissociated into a blender with fillers, oils, and inorganic binders having the same ingredients and amounts as in Example 1, followed by mixing. The slurry thus obtained was cut into an outer diameter of 25 mm and a length of 30 cm, and then dried at 110 ° C. for 6 hours in an electric hot air dryer to prepare a thermocouple protective sleeve.

상기 실시예에서 얻어진 슬리브와 기존이 세라믹 섬유를 주원료로 하여 제조된 슬리브의 내침식성을 비교하기 위하여 상기의 슬리브들을 대략 1750℃가량의 온도를 지닌 용강에 15초간 침적시킨 후 꺼낸다음 외관을 관찰하여 슬리브의 용융흔적 여부로 내침식성을 비교하였으며, 그 결과를 하기 표 1에 나타내었다.In order to compare the erosion resistance of the sleeve obtained in the above example and the sleeve manufactured using a conventional ceramic fiber as a main raw material, the sleeves were immersed in molten steel having a temperature of about 1750 ° C. for 15 seconds, and then removed. Erosion resistance was compared by melting traces of the sleeve, and the results are shown in Table 1 below.

[표 1]TABLE 1

Figure kpo00001
Figure kpo00001

상기 실험에서도 확인되듯이 본 발명에 의해 제조된 열전대 슬리브는 그 주성분이 용강내의 슬래그 성분과 동일하며 기존의 제품에 비해 내침식성이 극히 우수하고 용융물에 유해성분의 용출이 적으며 또한 제철폐기물인 슬래그를 주원료 및 충진재로 사용하기 때문에 폐기물 발생에 따른 환경오염을 감소시킬 수 있고 폐자원의 재활용으로 인해 원가 절감을 도모할 수 있는 등의 유용한 효능을 얻을 수 있다.As can be seen from the above experiment, the thermocouple sleeve manufactured according to the present invention has the same main component as the slag component in molten steel, and has excellent corrosion resistance compared to the existing products, less leaching of harmful components in the melt, and also slag which is steel waste. Since it is used as the main raw material and filling material, it can reduce the environmental pollution caused by waste generation, and can obtain useful effects such as cost reduction by recycling waste resources.

Claims (1)

적당한 크기로 절단된 섬유상의 내화단열재 40-90 중량%와 내화충진제 5-20 중량%와 결합제 3-10 중량% 및 기타 보조재료 2-40 중량%로 구성된 원료들을 혼합하여 압출방식 또는 진공흡착방식의 성형공정 및 건조공정을 거쳐 제조되는 주지의 슬리브 제조방법에서, 내화단열재로 제철폐기물인 슬래그를 섬유화하여 얻어지는 슬래그울을 사용하고, 내화충진제로 상기 슬래그를 분말화하여 얻어지는 슬래그 분말을 사용하는 것을 특징으로 하는 열전대 슬리브 제조방법.Extrusion or vacuum adsorption by mixing raw materials consisting of 40-90% by weight of fiber-resistant fire insulation, 5-20% by weight of filler, 3-10% by binder and 2-40% by weight of other auxiliary materials In the well-known sleeve manufacturing method manufactured through the shaping | molding process and the drying process, the slag wool obtained by fiberizing slag which is steel waste is used as a fire insulation, and using the slag powder obtained by powdering the slag with a refractory filler. Thermocouple sleeve manufacturing method characterized in that.
KR1019970024232A 1997-06-12 1997-06-12 Producing method of the sleeve for the thermoelectric couple KR100231506B1 (en)

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