• 제목/요약/키워드: Molten metal

검색결과 454건 처리시간 0.035초

Ladle내 잔류(殘留) 용융(熔融)슬래그의 LF 공정(工程)으로 재활용(再活用)에 관한 연구(硏究) (A Study on the Recycling of Molten Ladle Slag Residue into LF Process)

  • 김영환;유정민;김동식;임종훈;양성호
    • 자원리싸이클링
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    • 제22권1호
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    • pp.36-41
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    • 2013
  • 전기로 제강공정 중 LF 공정에서 슬래그는 전기로(EAF)에서 이월된 슬래그와 출강 중에 조재제인 생석회, 돌로마이트 등이 용강 중에 투입되어 생성된다. LF 조업이 끝나면 ladle은 연속주조 공정(CCM)으로 이송되며, ladle 하부의 노즐을 통해 tundish로 용강을 내보내어 연속 주조조업을 하게 된다. 일반적으로 연속 주조공정 후 ladle에 남는 슬래그와 잔강(殘鋼)은 슬래그 포트(Pot)에 받아 슬래그 야적장으로 이송되어 파쇄 후 처리된다. 본 연구에서는 연속 주조공정 후 ladle에 잔류한 용융슬래그(잔강(殘鋼) 포함)를 전기로 출강 후에 ladle 상부에 직접 투입하여 LF 공정 초기의 슬래그를 형성하는데 활용하고자 하였다. 그 결과 LF 공정 중에 사용되는 생석회의 원단위는 2.2 ~ 3.2 kg/steel-ton 저감되었으며, 용강의 생산회수율은 0.3 ~ 0.5% 증가되었다.

Comparison of the Recriticality Risk of Fast Reactor Cores following a HCDA

  • Na, Byung-Chan;Dohee Hahn
    • 한국원자력학회:학술대회논문집
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    • 한국원자력학회 1997년도 춘계학술발표회논문집(1)
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    • pp.495-501
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    • 1997
  • A preliminary and parametric sensitivity study on recriticality risk of fast reactor cores after a hypothetical total core meltdown accident was performed. Only neutronic aspects of the accident were considered, independent of the accident scenario, and efforts were made to estimate the quantity of molten fuel which must be ejected out of the core to assure a sub-critical state after the accident. Two types of parameters were examined : characteristic parameters of molten core such as geometry, molten pool type (homogenized or stratified), fuel temperature, environment, and relative parameters to normal core such as core size(small or large), and fuel type (oxide, nitride, metal). The first type of parameters was found to intervene more directly in the recriticality risk than the second type of parameters.

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용융금속 이송용 편측식 선형유도전동기의 설계 및 해석 (Analysis and Design of the Sin91e-sided Linear Induction Motor for Transferring Molten Metal)

  • 김창업;홍성욱;김성원;심동준
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1999년도 추계학술대회 논문집 학회본부 A
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    • pp.46-48
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    • 1999
  • This paper presents the design and characteristics analysis of a linear induction motor applied to molten metals. A linear induction motor is designed to increased to thrust and is applied to the experimental instrument. The experiment shows the availability of the LIM for transferring the molten metals.

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알루미늄 용탕 보온로의 열해석 및 하부 구조물의 강도해석 (Analysis of Temperature of Molten Aluminium Holding Furnace and Stress of Substructure Frame)

  • 박상수;강충길;김병민
    • 한국정밀공학회지
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    • 제22권10호
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    • pp.129-136
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    • 2005
  • The demand on thermos furnace of Al molten metal has recently been getting higher and higher according to the increase in use of Al and Al alloys. This study considers the estimation of the thermal and mechanical stability in the thermos furnace for Al casting. It is executed through the analysis of heat transfer on the refractory material and heat stress on each steel shell. Also, the estimation of structural stability was appraised through the strength analysis of the lower structure. In result, the temperature of steel shell rose to 320.15K and its elastic deformation was about 1.5mm. The elastic deformation of the lower structure was about 0.66mm. As a result of it, the data obtain from the analysis in this study are regarded as stable value on considering that the size of the furnace is 2500mm.

제올라이트를 이용한 용융염폐기물 고정화 (Immobilization of Molten Waste Salt Using Zeolites)

  • 김정국;이재희;김준형
    • 한국방사성폐기물학회:학술대회논문집
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    • 한국방사성폐기물학회 2003년도 가을 학술논문집
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    • pp.215-219
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    • 2003
  • 현재 국내에서 개발 중인 사용후 핵연료의 금속전환공정에서 발생이 예상되는 LiCl 염폐기물을 제올라이트로 고정화한 후 최종 고화체를 만드는 기술을 개발 중에 있다. 여러 혼합조건에 대해 고정화 생성물의 결정을 분석한 결과 모든 혼합조건에서 제올라이트 A형이 제올라이트 Li-A으로 전이되었으며, 일부 혼합조건에서는 Minor phase로 소달라이트 형도 발견되었다. 자유염 발생이 최소가 되는 혼합조건은 Cs, Sr 핵종이 포함된 LiCl 제올라이트 비가 1.0인 조건이었다.

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선형유도전동기를 이용한 전자기 펌프의 특성해석 및 실험 (Characteristics Analysis and Experiment of Electromagnetic Pump using LIM)

  • 김창업;전문호;권정태;임효재
    • 조명전기설비학회논문지
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    • 제21권6호
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    • pp.65-70
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    • 2007
  • 본 논문에서는 선형유도전동기의 전자기력에 의해 용융 금속을 이송할 수 있는 전자기 펌프에 대하여 특성 해석 및 실험 결과에 대하여 제시하였다. 선형유도전동기에서 발생하는 전자기력과 전자수력학(MHD) 현상을 결합하여 용융 금속의 이송 특성을 해석하였다. 실험은 용융 아연을 대상으로 하였으며, 해석 결과와 비교 검토하였다.

스퀴즈캐스팅용 Salt Core의 제조 및 용탕침투성에 관한 연구 (A Study on the Fabrication Process and Melt Infiltration of Salt Core in Squeeze Casting Method)

  • 김기배;노상우;이호인;남태운
    • 한국주조공학회지
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    • 제17권4호
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    • pp.402-410
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    • 1997
  • Developing a salt core for squeeze casting process, two different salt cores(pure salt core and mixed salt core) were fabricated and investigated. Pure salt core was composed of 100% NaCl and mixed salt core was made by mixtures of NaCl with MgO(1%), $Na_2B_4O_7$(2%), and talc(1%) as a binder or a strengthening agent. Salt cores were compacted to various theoretical density, heat treated, and then squeeze-cast with molten Al alloy(AC8A). The compression strength of salt cores were measured and the squeeze-cast products were examined for shape retention, infiltration of molten metal into the cores, and microstructures. The shape of salt core compacted at above 75% of the theoretical density was maintained stably. The higher theoretical density of salt cores gave higher compression strength, and the compression strength of mixed salt core was higher than that of pure salt core. Namely at 90% theoretical density, the compression strength of mixed salt core was $6.3 kg/mm^2$, compared to $4.6 kgmm^2$ for pure salt core. At a squeeze casting pressure of $1000 kg/cm^2$, molten Al alloy was infiltrated into pure salt core of under 85% of the theoretical density. At squeeze casting pressure of $1000 kg/cm^2$, only mixed salt core above 90% of the theoretical density were valid, but the shape of the core was altered in the case of pure salt core at 90% of theoretical density. A key factor for developing a salt core for squeeze casting process was estimated as the ultimate compressive strength of salt core.

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