• 한국응용과학기술학회지
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• 제32권1호
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• pp.23-30
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• 2015

The properties of dust collected from electric arc furnace of ferro manganese production units was investigated, and also the metallic manganese was recovered from the dust by aluminothermy process. The ferromanganese dust collected from electric arc furnace contained about 15% of manganese oxide ($Mn_3O_4$) and 9% of carbon as the contaminant, and have a 5um of 50% median diameter and irregular particle shape. The carbon contaminant in the dust could be reduced until about 0.1~0.5% level by roasting in the air at a temperature of 600~900C for 60minutes. The recovery of manganese could not be carried out using only ferromanganese dust from electric arc furnace by aluminothermy process, but the ferromanganese which contained manganese of about 92% and iron of about 5% could be obtained from the mixture of ferromanganese dusts from electric arc furnace and converter. The best mixing condition of dust fixed at electric arc furnace dust / converter dust ratio of 1:9 and 2:8, and the mixing rato of 3:7 or more could not separated the metal and slag from the reactant after aluminothermy reaction.

• 콘크리트학회논문집
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• 제21권5호
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• pp.581-588
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• 2009

전기로 슬래그는 철강 생산 공정에서 발생되는 산업 부산물로서 그 발생량이 꾸준히 증가하고 있어 효율적인 재활용 방안이 요구되고 있다. 전기로 슬래그는 f-CaO 및 f-MgO에 기인한 팽창성이 우려되어 대부분이 노반재로 사용되었지만, 현재는 체적안정성을 확보한 전기로 산화 슬래그를 콘크리트용 골재로 사용하는 것이 가능하게 되었다. 이 연구에서는 콘크리트용 전기로 산화 슬래그 골재를 사용한 RC 보의 부착 특성에 관하여 고찰하기 위해 부착 파괴를 유도한 Ichinose식 단순보형 실험을 실시하였다. 실험 결과, 전기로 산화 슬래그 골재를 사용한 실험체는 천연골재를 사용한 경우보다 동등 이상의 부착 성능을 발휘하는 것으로 나타났다. 특히, 전기로 산화 슬래그 굵은골재를 사용한 실험체는 콘크리트 압축강도의 영향을 고려하여도 천연골재보다 1.5배 이상의 높은 부착 강도를 나타내었다.

• Journal of Advanced Marine Engineering and Technology
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• 제28권8호
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• pp.1251-1257
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• 2004

In order to analyze the heat transfer phenomena in the plasma flames, a mathematical model describing heat and fluid flow in an electric arc has been developed and used to predict heat transfer from the arc to the steel bath in a DC Electric Arc Furnace. The arc model takes the separate contributions to the heat transfer from each involved mechanism onto account, that is radiation, convection and energy transported by electrons. The finite volume method and a SIMPLE algorithm are used for solving the governing MHD equations, that are conservation equations of mass, momentum and energy together with the equations describing a standard k-${\varepsilon}$ model for turbulence. The model predicts heat transfer for different currents and arc lengths. Finally these calculation results can be used as a useful insight into plasma phenomena of the industrial-scale electric arc furnace. From these results, it can be concluded that higher arc current and longer arc length give high heat transfer

• 열처리공학회지
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• 제36권1호
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• pp.22-32
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• 2023

In general, when scrap is dissolved in an electric arc furnace, the amount of electric furnace steel dust (EAFD) generated is about 1.5% of the scrap charge amount, and the electric furnace steel dust collected by the bag filter is charged into the Rotary Kiln or Rotary Hearth Furnace (RHF), and the zinc component is recovered as crude zinc oxide, at which time a clinker of Fe-Base is generated. In this research, first, for the efficient resource conversion of electric furnace steel dust, a reduction and roasting experiment was conducted and the reaction kinetics was examined. As a result of the experiment, it was observed that the reduction and roasting reaction was actively conducted in the range of 1100~1150℃, and melting occurred in the range of 1250℃. In the past, this clinker was widely used as a roadbed material for road construction and an Fe-Source for cement production, but in recent years, it has been mainly reclaimed due to strengthening environmental standards. However, landfill treatment is by no means a desirable treatment method due to environmental pollution caused by leachate, expensive landfill costs, and waste of Fe resources. Therefore, in order to more actively recycle the Fe component in the clinker, first of all the clinker was pulverized into an optimal particle size, and anthracite and binder (starch) were added to the magnetic material obtained by specific gravity and magnetic separation for briquet. As a experimental results, it was possible to efficiently separate clinker as Fe component and other slag component by specific gravity and magnetic force. As a results of loading and dissolving the manufactured briquet clinker in an electric arc furnace, it was observed that the unit of power and production yield were clearly improved and the carbon addition effect in molten metal was also somewhat.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.303-306
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• 1997

In this paper, we carried out the fundamental experiments on the resistance of chemical attack of mortar using the electric arc furnace slag as fine aggregate. The mortar specimens made from the electric arc furnace slag (EAF slag) as fine aggregate were immersed in artificial seawater and two sorts of chemical solutions, and measured to investigate the change of compressive strength and weight.

• 플랜트 저널
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• 제6권1호
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• pp.71-75
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• 2010

In this study, the validity study has been carried out to apply the combustion burner in an electric arc furnace. The validity of applying the combustion burner has been studied in the aspect of the operation through the calculation of heat balance. The average decrease rate of power on time is 11.2%. When the maintainability is compared to the door lance manipulator type, the multi-functional combustion burner is simple to replace and repair. The location of burner can be adopted according to the drawings which are recommended in this study. As a result, the validity of applying the combustion burner to improve an efficiency of electric arc furnace has been confirmed.

• 자원리싸이클링
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• 제18권4호
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• pp.52-61
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• 2009

본 연구의 목적은 기존 전처리 방법과 본 연구에서 도출한 표면처리 방법으로 전처리한 전기로슬래그의 물성을 분석하고 전처리 방법을 달리한 각각의 전기로슬래그의 대체율을 변화시켜 제작한 콘크리트의 특성을 비교 고찰하여 산업부산물인 전기로슬래그를 콘크리트용 굵은골재의 대체재로 활용하는데 있다. 한편, 표면처리 방법은 무기계의 실리카 용액을 사용하여 1일 함침 후 6시간 자연 건조하는 방법을 이용하였는데, 결과로부터, 기존의 온수처리방법에 비해 본 연구에서 사용한 표면처리방법이 더욱 효과적이었으며, 표면처리방법이 전기로슬래그의 팽창성 감소와 콘크리트용 굵은 골재로 활용하는데 효과적이라고 판단된다.

• 한국건설순환자원학회논문집
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• 제2권1호
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• pp.128-135
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• 2006

제강슬래그 중 콘크리트용 골재로 활용 가능성이 있는 전기로슬래그 골재에 대하여 촉진에이징 종류별 전기로슬래그 골재의 팽창성 감소 정도를 파악하고, 콘크리트용 최적 에이징 처리 방법 및 처리 기간을 제시하고자 하였다. 또한, 에이징 처리 후에도 전기로슬래그 골재 내부에 잔류되어 있는 팽창성이 콘크리트에 미치는 영향 및 콘크리트의 품질을 비교, 고찰하였다. 전기로슬래그 골재의 수침팽창 측면에서 온수중 에이징 방법이 증기중 에이징 방법보다 다소 우수한 결과를 나타내었다. 전기로슬래그 골재의 잔류팽창과 콘크리트의 압축강도를 비교한 결과 콘크리트용으로 전기로슬래그 골재를 사용하기 위해서는 에이징 처리에 의해 잔류팽창을 0.06% 이하로 충분히 낮춘 후 사용해야 한다. 또한 현재 도로용으로 한정되어 사용되고 있는 전기로슬래그를 콘크리트용 골재로 사용하기 위해서는 골재의 품질개선 뿐만 아니라 감수제 및 AE제 등 적절한 혼화재료의 사용이 필요하겠다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 A
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• pp.298-300
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• 2004

Arc-furnace facilities consume 9,895,165(MWh) which is about 69.6 Percent of electronic furnace power consumption. and interior of a country demand power have inclosed annual. but becaused of the problem of cost, power plant location, and environment have faced difficulty to electric power supply. In this paper, Examining Load cutting of Arc-furnace that is dominating high weight of industry electric power use. and it is expected to solve easily electric power supply and demand problem by highest Priority load cutting examination of Arc-furnace when electric power supply and demand problem happens to area electric power system when is urgent.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.573-575
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• 2005

In the steel industry, a steel melting electric arc furnace is used to produce both carbon and alloy steels. Steel scrap which is charged into the furnace is heated by means of electric arc between graphite electrodes and the scrap. In this melting process, current is supplied to the furnace through HCC(high current cable) which connect the furnace and transformer. Four HCCs are assigned to each phase in our system to divide the current. Since a sudden cable breaking result in the shutdown of melting process, an aging detection of HCC is very important for both an improvement of productivity and cost reduction. In this paper, the aging of the HCC is estimated by using the current ratio between four HCCs.