• 한국세라믹학회지
• /
• 제15권4호
• /
• pp.213-223
• /
• 1978

The purpsoe of this study was to produce domestic stamping materials; sling mass which could be used as unburned refractory for iron melt'ladle. Batch compositions were based on Belgian Ladelite; mineral compositions were composed of 84 wt% of quartz and 16 wt% of clay, and particle sizes were divided into 12 wt% of 1410/297㎛, 18wt% 297/149㎛, 20wt% of 149/74㎛, 11wt% 74/44㎛ and 39wt% 44㎛ under. The effect of variable batch compositions were also investigated such as substitution of pyrophylite or industrial grade alumina for quartz and of zircon for portion of quartz and clay, increase of clay and addition on sericite. Samples were pressed at 100kg/㎠ with 7.4wt% of water or 7.4wt% of 4 wt% PVA solution. Dried and Fired properties of samples such as linear shrinkage, apparent porosity, modulus of rupture, refractoriness and corrosion resistance to blast furnace slag were investigated. The results are summarized as follows. 1. Dried samples are shrinked, but fired at 700-1400℃ expanded. Samples fired at 700-1000℃ and 1200-1400℃ tended to expand with incresing of firing temperature, but fired at 1000-1200℃ tended to shrink with increase of firing temperature. 2. Apparent porosity of samples fired at 700℃ is increased, but fired at 1200-1400℃ decreased with increasing of firing temperature. 3. Modulus of rupture of samples fired at 700℃ is decreased, but fired at above 700℃ increased with increasment of firing temperature. 4. Dried samples with 7.4 wt% of 4 wt% PVA solution better improve modulus of rupture than with 7.4 wt% of water, but the firing strength of the sampels fired at 700-1000℃ is showed reversely. 5. In quartz-clay system, mineral phases of samples fired at above 1200℃ are consisted of α-quartz, α-cristobalite and mullite. Respectively as firing temperature was rising up, intensity of α-cristobalite and mullite is in creased. 6. Quartz-Kibushi clay system, Kimcheun quartz(substitutuion of portion of industrial grade alumina for quartz) Hampyeung clay system and pyrophyllite-clay system are better in corrosion resistance to blast furnace slag than burned pyrophyllite brick. 7. 84 wt% of pyrophyllite-16wt% of clay system is superior in modulus of rupture and corrosion resistance to blast furnace slag to 84 wt% of quartz-16 wt% of clay system.

• 한국재료학회:학술대회논문집
• /
• 한국재료학회 2003년도 춘계학술발표강연 및 논문개요집
• /
• pp.154-154
• /
• 2003

고품질의 합금강 생산 시 가장 큰 영향을 미치는 레이들정련은 고온 하에서 반응 및 유동이 일어나므로 실제조업 직접관찰이나 측정이 대단히 어려울 뿐만 아니라, 수많은 조업인자와 상호 결합되어 있기 때문에 최적의 작업조건을 찾는데 많은 시행착오를 겪는다. 본 실험에서는 직접 조업하는 조건과 가장 부합하는 수모델 실험 및 Flow 3D를 이용한 수치해석 방법으로 비용의 절감 및 실험에 대한 위험부담 등 시행착오를 최소화하면서 최적의 작업조건을 도출하여 고품질 합금강 생산성과 process 효율성의 극대화를 찾을 수 있다. 따라서 본 연구에서는 슬래그의 물성(슬래그 양, 점도)을 고려한 gas bubbling 조건(가스유량, 유체높이, ladle 크기, 단공nozzle, porous plug 위치)에 따른 용강의 교반특성 및 용강의 슬래그 혼입 거동을 조사함으로써 고청정 용강 제조를 위한 최적 gas bubbling 조건을 설정하기 위한 수모델 실험과 수치해석 연구를 실시하였다. 수모델 실험을 통한 기포형성 거동과 용강의 교반특성에 대한 현상론적 연구와 병행하여, 유동장 측면에서 이상유동을 가정한 수치해석을 통해 실제 용강 래들 내에서의 거동을 정량화 하고자 한다.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2001년도 ICCAS
• /
• pp.114.2-114
• /
• 2001

In steel works, Locomotives and torpedo ladle cars are used to convey the smelted iron that comes out Blast Furnace to the steel-making mill. Above conveying vehicles are operated in all steel works area. And to trace their positions, after partitioned their areas, Automatic Vehicle Identification(RF-ID method) is installed on the railroad and identifies vehicle numbers. But AVI facilities have many problem that means that are too expensive, cost too much maintenance fee and inefficient management. This paper is to revamp those inefficient operations and state the status of operations of train positioning system, get to know what the problem is. And also when we use GPS to monitor and trace the vehicle position ...

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2002년도 ICCAS
• /
• pp.38.1-38
• /
• 2002

In steel works, Locomotives and torpedo ladle cars are used to convey the smelted iron that comes out Blast Furnace to the mill making mill. In this process, Identification of the vehicles position is very important because the area is broad and efficient operation affects a productivity and investment. At present condition, there are many ways to use to identify the vehicles number and position. This paper will present the new ways using GPS/DR based method. For this, we practiced the site test to gather the real data. First, we collect the velocity data at the wheel of the vehicles with the direction data via process computer. Second, after installing the gyroscope we gathered the data wit...

• Journal of Mechanical Science and Technology
• /
• 제14권12호
• /
• pp.1365-1375
• /
• 2000

Two phase flows have been numerically calculated to analyze plume characteristics and liquid circulation in gas injection through a porous plug. The Eulerian approach has been for formulation of both the continuous and dispersed phases. The turbulence in the liquid phase has been modeled using the standard $textsc{k}$-$\varepsilon$ turbulence model. The interphase friction coefficient has been calculated using correlations available in the literature. The turbulent dispersion of the phase has been modeled by the "dispersion Prand시 number". The predicted mean flows is compared well with the experimental data. The plume region area and the axial velocities are increased with the gas flow rate and with the decrease in the inlet area. The turbulent intensity also shows the same trend. Also, the space-averaged turbulent kinetic energy for various gas flow rates and inlet areas has been obtained. The results are of interest in the design and operation of a wide variety of materials and chemical processing operations.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2017년도 춘계 학술논문 발표대회
• /
• pp.24-25
• /
• 2017

Ambient temperature has a direct impact on the hydraulic process. Though -any experiments have been processed in order to investigate the hydration properties under the various ambient temperature of OPC, there are not reported about aluminate-based composite. This presentation is composed of contents on the experimental investigation of the hydration heat of pulverized rapid cooling ladle furnace slag based composite. Based on the experimental outcomes, gypsum can decrease the hydration heat dramatically and lower ambient temperature has a negative effect on accelerated the hydraulic process.

• 한국가시화정보학회지
• /
• 제16권1호
• /
• pp.54-60
• /
• 2018

It is important to develop more efficient and productive casting processes for an automated high precision molten-metal casting system. Detailed analysis of molten-metal flow in the casting process by the numerical approach will help to optimize the control of a ladle. In this study, the smoothed particle hydrodynamics method was applied to analyze casting flow characteristics with different tilting angular speed and initial molten-metal level. The smoothed particle hydrodynamics technique has advantages to easily handle non-linear free surface behavior with the absence of a computational mesh. We found that tilting angular speed has relatively greater effect on the casting flowrate and that the effect of the initial molten-metal level is only minor. Further extensive study will be necessary to find an optimal condition for high efficient casting system.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2016년도 춘계 학술논문 발표대회
• /
• pp.36-37
• /
• 2016

Among all the slags, ladle furnace slag (LFS) is reducing slag generated from electric arc furnace. After cooled rapidly by high-pressured air (atomizing technology), LFS has more amorphous phase than slow cooled slag. Therefore, it shows higher reactivity than another recycling slag. This material also is named by rapid cooling LFS (RC-LFS). Pulverized RC-LFS should be fully understood. This paper deal with the present some basic experimental properties and discussions about the setting time of pulverized RC-LFS with different gypsum under the various temperatures. According to the experimental results, the pulverized RC-LFS with gypsum can hydrate in a low-temperature environment, even though the initial and final setting time are delayed.

• 한국주조공학회지
• /
• 제6권2호
• /
• pp.93-103
• /
• 1986

It is very important to obtain wear resistant ductile iron by adding more economical alloying elements. In this study, 10 heat of Mg-treated ductile iron were made according to Sb content (0-0.1% Sb). Each melt was tasted to 30 ${\o}test$ bars in $CO_2$ mold under the same condition and inspected wear characteristics, mechanical properties and microstructures. The results obtained from this study are as follows; 1. It is confirmed that Sb should be a simple and useful additive for improving wear resistance in ductile iron. 2. Hardness of ferrite and pearlite is improved with increasing Sb amount in ductile iron. 3. For ductile iron, the recommended ladle addition of Sb amount is to 0.02-0.03%. 4. Sb has adverse influence on spheroidizing of graphite if the amount is over 0.04%.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2015년도 춘계 학술논문 발표대회
• /
• pp.154-155
• /
• 2015

This study was to review the basic characteristics in order to evaluate field application of the emergency road repair materials for development of CAC(Calcium Aluminate Composite) usage. The experiment was conducted with two phases of field and laboratory conditions and the laboratory experiment consisted indoor and outdoor tests for compressive and flexural strength. In the result of an experiment, for the compressive strength test, the specimens that cured in the laboratory conditions were not satisfied the requirement of standards, while the specimens that cured in the field conditions were well satisfied with those. For flexural strength test, the result value was satisfied with the requirement on the standards only in outdoor curing condition of laboratory experiment. Based on these results, it is expected that the CAC can be used as an emergency road repair material for field conditions.