• Title/Summary/Keyword: steel-making

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Virtual-reality-based Operation Training System for Steel Making Process (가상 현실 기반 철강 공정 조업 교육 시스템)

  • Choi, Ja-Young;Lee, Jin-Hwi;Kim, Yong-Soo;Kim, Seok
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.8
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    • pp.709-712
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    • 2015
  • This paper will introduce the development case study about virtual-reality-based operation training system for steel making process. Steel making process consist iron making process to create liquid steel, pig iron, by reduction process, steel making process to make molten steel by refining, continuous casting process to make slab, and rolling process to make final product like coil, plate. This steel making process deals with liquid and solid products, so facilities of steel making process are very various and complicated. In addition, according to various customer requirements, the recycle of facilities and recipes changing have been fast. So the training for skilled operators is very important point. In this paper, we develop steel making training system based virtual reality for training skilled operator. This system consists of virtual machine, virtual HMI, and virtual control panel. And for fitting the characteristics of each process and increasing the education effectiveness, we develop dynamic methods like the method of dynamic education system configuration, initial facilities setup operation education system, and etc.

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

  • Kim, Young-Hwan;Yoo, Jung-Min;Kim, Dong-Sik;Lim, Jong-Hoon;Yang, Sung-Ho
    • Resources Recycling
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    • v.22 no.1
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    • pp.36-41
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    • 2013
  • LF slag is formed by EAF carryover slag and slag former(such as lime, dolomite) put into the ladle during the tapping molten metal. After LF process, continuous casting is started when molten steel is sent from ladle to tundish through bottom nozzle of ladle. Conventionally, remained molten slag and steel in ladle are poured into a slag port and they are transferred to a slag yard and then recycled. In this study, we investigated about recycling of molten LF slag residue(including Fe residue to reuse) which is made in steelmaking process. As a result, lime usage was decreased about 2.2~3.2 kg/steel-ton and also molten steel yield rate was increased about 0.3 ~ 0.5 percent point.

Swine Wastewater Treatment by using Steel-making Slag (제강슬래그 특성을 이용한 축산폐수 처리효과)

  • Kim, Tae Heui;Park, Kyung Bong
    • Clean Technology
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    • v.6 no.2
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    • pp.85-92
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    • 2000
  • For increase of recycling rate of steel-making slag, the swine wastewater treatment using steel-making slag as filter media were investigated. As the discharged wastewater from the existing facilities retreated through the laboratory wastewater treatment equipment filled with steel-making slag as filter, pH of retreated wastewater was increased, and the concentration of N, P, COD and BOD were decreased. For the pilot experiment, steel-making slag eliminated suspended substances and absorbed a shock of sudden change of their concentration in influent. COD and BOD were decreased under the influence of them in influent. As calcination increased the amount of free-CaO in steel-making slag, the calcined eliminated phosphorus more effectively and increase pH than the uncalcined.

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Evaluation of Lead, Copper, Cadmium, and Mercury Species in the Leachate of Steel Making Slag by Seawater (해수에 의한 제강 슬래그의 납, 구리, 카드뮴 및 수은 화합물의 용출특성 평가)

  • Lee, Han-Kook;Lee, Dong-Hoon
    • Journal of Korean Society of Environmental Engineers
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    • v.27 no.1
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    • pp.75-84
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    • 2005
  • The aim of this study is to evaluate the leaching characteristics of lead, copper, cadmium, and mercury from steel making slag by seawater. To demonstrate the leaching characteristics of heavy metals from steel making slag by seawater, it was carried to various leaching tests such as regular leaching tests, liquid/sold(LS) leaching test and pH static test. From the leachability of $Pb^{+2},\;Cu^{+2},\;and\;Cd^{+2}$ from steel making slag in pH static test, it is distinguished between distilled water and seawater. With distilled water, it is very low between pH 7-8 and pH 11-12. On the other hands, with the seawater, its leaching is higher than that of distilled water. In particular, concentration of $Hg^{+2}$ leached from slag by seawater is lower than that of distilled water. Meanwhile, we found that the heavy metals from steel making slag would be dissolved and precipitated using geochemcial equilibrium program such as visual minteq. Lead and copper leached from steel making slag with seawater were dissolved nearly in the range of pH 11-12, but in the range of pH 7-10 those were precipitated about 90%. And cadmium leached from steel making slag with seawater were dissolved completely. On pH static test with distilled water, lead leached from steel making slag seemed to be similar to pH static test with seawater. However, copper and cadmium leached from steel making slag were dissolved. In general, the species of lead leached from steel making slag were formed mainly of $PbCl^+,\;PbSO_4$, the species of copper were formed mainly of $CuSO_4,\;CuCO_3$, the species of cadmium were formed mainly of $CdCl^+,\;CdSO_4$ due to being sorbed with the anions($Cl^-,\;CO_3^{-2},\;SO_4^{-2}$) of the seawater. Both pH static test with seawater and distilled water, it is not in the case of the mercury. Most of mercury leached from steel making slag was precipitated(SI=0). Because the decreasing of $Hg^{+2}$ concentrations depends ferociously on the variation of chloride($Cl^-$) existed in the seawater. $Hg^{+2}$ leached from steel making slag could be sorbed strongly with chloride($Cl^-$) compared of carbonate($CO_3^{-2}$) and sulfate($SO_4^{-2}$) in the seawater. On the basis of that result, we found that the species of mercury was formed of calomel($Hg_2Cl_2$) as one of finite solid. Due to forming a calomel($Hg_2Cl_2$) in the seawater, the stability of mercury species by steel making slag should be higher than those of lead, copper, and cadmium species. Regarding the results stated above, we postulated that the steel making slag could be recycled to sea aggregates due to being distinguishing leachability of heavy metals($Pb^{+2},\;Cu^{+2},\;Cd^{+2},\;and\;Hg^{+2}$) between leaching tests by distilled water and seawater.

Simulation model at continuous steel-making process (연속제강공정의 simulation model)

  • Moon, Il;Song, Hyung-Keun;Shim, Jae-Dong
    • 제어로봇시스템학회:학술대회논문집
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    • 1986.10a
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    • pp.474-478
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    • 1986
  • The phenomenon of a continuous Steel-making process was studied with a set of collected equilibrium data for the steel-oxidation reactions. Mass and Heat balances were also established. Mass transfer constants which are physically unmeasurable but escential for the simulation study in the steel-making process were calculated from the experimental data using an optimization technique. Based on these data various operating conditions and process characteristics were examined.

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FASTMET$\circledR$ Process for Steel Mill Waste Recycling

  • Tanaka, Hidetoshi;Harada, Takao;Sugitatsu, Hiroshi
    • Proceedings of the IEEK Conference
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    • 2001.10a
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    • pp.387-392
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    • 2001
  • Kobe Steel, LTD. and Midrex Technologies Inc. jointly developed the FASTMET$\circledR$ process as a steel mill waste recycle technology in which the DRI product meets BF feed material or BOF/EAF feed material requirements. FASTMET(R) process turns value-less wastes into valuable DRI and sellable zinc oxide, and gives the solution for the steel mill wastes recycling from both economical and environmental viewpoints. During the development of the process, Laboratory, Pilot Plant and Demonstration Plant tests were carried out from 1990 to 1998. The first FASTMET(R) commercial plant began operation in April, 2000 and the second commercial plant started in April, 2001 Both commercial plants have proceeded successfully preying that FASTMET$\circledR$ is a suitable process for recycling steel mill waste and for producing DRI as an iron source.

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Modeling and stable startup strategy for strip-caster

  • Lee, Dukman;Lee, Jin S.;Kim, Y.H.;Lee, D.S.
    • 제어로봇시스템학회:학술대회논문집
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    • 1996.10a
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    • pp.319-323
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    • 1996
  • A new steel-making process, strip-casting, is introduced. The strip-casting is a new technique making the thin steel strip from the molten steel directly without resorting to repetitive reheating and hot-rolling required in a conventional steel-making method. This paper derives the mathematical model of strip caster, proposes a control strategy for stable startup operation and a fuzzy decision making rule for automatic control mode change in strip-casting process.

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Characteristics of Saturated Hydraulic Conductivity in Steel Making Slag and Sludge according to Mixing Rate of Bentonite (벤토나이트 혼합율에 따른 제강 슬래그 및 슬러지의 투수 특성 변화)

  • Woo, Won-Jae
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.3 no.1
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    • pp.52-61
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    • 2000
  • Permeability is important factor in the geotechnical problems, such as seepage discharge and dissipation of excess pore water pressure. The Kozeny-Carman equation works well for graded soils but serious discrepancies are found in clays. Major factor for these discrepancies is the tortuous flow path and unequal pore size. To estimate the permeability of fine grained soils, a permeability equation in which swelling potential is coupled with Kozeny-Carman equation is proposed in this study. To verify proposed equation, a series of variable head permeability test was carried out for steel making slag and sludge mixed with bentonite. The coefficients of permeability which is measured in the laboratory is compared with the values by the proposed equation. From the comparison, it is shown that the proposed equation can predict the coefficient of permeability of clays with satisfaction. As steel making slag and sludge is industry waste, it is reused as material of road foundation and cement but the rate of use is low. It mixed sodium-bentonite with high swelling property and permeability decrease effect. Then, Admixture investigates reuse possibility as liner of waste fill.

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New Energy Saving Technology of Electric Arc Furnace in Steel Making Industry (철강산업체 전기로(EAF) 설비에서 에너지절약 최신기술동향)

  • Oh, Dong-Whan;Park, Hyun-Kyu;Park, Tae-Joon;Im, Sang-Kug
    • Proceedings of the KIEE Conference
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    • 2003.07a
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    • pp.71-73
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    • 2003
  • The paper discussed for energy saving technology of electric arc furnace (EAF) in steel making industry. The energy of EAF in steel making process is nearly 10% of total manufacturing cost. This paper is shown new trand of energy saving technology and future study analysis of technological evolution of the EAF by 2010 issued IISI.

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A Study on Design Characteristics of Steel-framed House in Korea (국내 철골조 단독주택의 디자인 특성에 관한 연구)

  • 박준웅;여준기;최무혁
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2002.11a
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    • pp.125-129
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    • 2002
  • Judging from recent aspects of lift, Housing of diverse types are emerzing as the interest of housing quality takes a growing with advanced life-cycle, varity of dweller needs and high-grade consuming patterns. This study is to explore more positive design method of steel-framed house through analysis about the decorative properties, choosing steel-framed house designed by domestic architects after 1990. In conclusion, as actively making use of merits of steel-framed house and making up its faults, it is suggested as a possibility of modern future-types housing

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