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RISS 인기검색어
- 검색키워드
- 저자 : 박균영 ( Kyun Young Park ) (검색결과 29 건)
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기상반응에 의한 초미립 무기분말 제조시 입자성장 모델연구 - 초미립 철분말 제조에의 응용 -
박균영,오의경,김선근,장희동 ( Kyun Young Park,Eui Kyung Oh,Sun Geon Kim,Hee Dong Jang ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.4
Presented is a model for the prediction of the particle size distribution of inorganic powders made by the gasphase reaction. The assumption used in previous models that a monomer forms a nucleus is eliminated; the model incorporates the determination of the number of monomers required to form a nucleus and the nucleation rate based on the classical theory. The present model was applied to a manufacture of ultrafine iron powders by hydrogen reduction of FeCl₂ vapor. The average particle size of the iron powder predicted by the model was one half to two thirds of the experimental value. For a reaction temperature of 900℃, the model could fit the experimental diameter by using the surface tension of iron 1.283 times as high as that in the literature. The model prediction agrees well with experimental observation in the trend of particle size increasing with the feed rate of FeCl₂. The model, however, showed a deviation from experimental observations on the effects of the reaction temperature and of the preheating temperature on the particle size. Further investigation needs to be followed to correct the model.
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염화알미늄수화물의 부분열분해에 의한 PAC ( Polyaluminum Chloride ) 응집제 제조
박균영,이규철,김진권,( Kyun Young Park,Kyu Chul Lee,Jin Kwon Kim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.5
Presented is a new method of manufacturing PAC(polyaluminum chloride) used as flocculant for water treatments : PAC is obtained through partial decomposition of aluminum chloride hexahydrate at 180℃ to give basic aluminum chloride followed by dissolving the basic chloride in water. With varying the extent of decomposition, properties of the solid-state basic chloride and the PAC solution were analyzed. The IR analysis showed that at an extent of decomposition of 33.4% an absorption band appeared at 980 ㎝^(-1) indicating the formation of basic aluminum chloride. The basicity of the PAC solution was observed to increase with increasing the extent of decomposition. In order to meet the basicity of 45% required for commercial grade PAC, it was found necessary to have an extent of decomposition higher than 45%. According to the NMR analysis, both [Al(H₂O)_6]^(3+) monomer and aluminum chloride polymers were present in the PAC solution. The molar ratio of the polymers to the monomer increased with an increase in the extent of decomposition. The PAC manufactured by the present method was tested on the water taken from the Kum river.
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박균영,장희동,김원백 ( Kyun Young Park,Hee Dong Jang,Won Baek Kim ) 한국화학공학회 1994 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.32 No.1
Ultrafine iron-cobalt alloy powders having diameters less than 0.1 micron were manufactured by hydrogen reduction of vapor mixtures of iron(II) chloride and cobalt(II) chloride. The effects of the following variables on chemical, morphological and magnetic properties of the powders were experimentally investigated: composition of iron and cobalt in the alloy powder, concentrations of the metal chlorides in the vapor, flow rates of hydrogen and carrier gas(argon), conditions for the post-formation of oxide films on the powder surface, and the magnetic field applied where the powder is formed. Particle size distribution, chemical compositions of impurities, crystal structure and magnetic properties of the powders were measured using ICP, PIXE, XRD, EDS, XPS, TEM and VSM. The average particle size of the powder was in the range of 0.025 to 0.045 micron. Most of oxygen and chlorine, major impurities in the powder, were observed to exist on the surface of the powder. By applying a magnetic field where the powder is being formed, the curved chain of iron-cobalt alloy particles was straightened, and a higher coercive force was obtained. The maximum coercive force of the iron-cobalt powders was 1,466 oersted. The saturation magnetization of the powder ranged from 130 to 180 emu/g.
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염산에 의한 고령토 중의 알루미늄 추출반응에 관한 속도론적 연구
박균영,정진기,최영윤,강태원 ( Kyun Young Park,Jin Ki Jeong,Young Youn Choi,Tae Won Kang ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.4
For a low-grade clay from Hadong and Sancheong area, experiments have been made on the extraction of aluminum from the clay by hydrochloric acid. The effects of various variables such as reaction temperature, reaction time, hydrochloric acid concentration and pretreatment temperature of the clay on the extraction yield of aluminum were investigated experimentally. A mathematical model is proposed, which can predict the extraction yield of aluminum for varying reaction conditions. The results predicted by the model showed good agreement with experimental data.
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박균영 ( Kyun Young Park ) 한국화학공학회 1996 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.34 No.2
According to the classical model, one or two iron atoms may be enough to form a critical nucleus in the production of iron powders by reducing ferrous chloride with hydrogen. In. the present work, the nucleus size was calculated using the atomistic model and compared with that by the classical model. For a supersaturation ratio of 500,000, the number of iron atoms constituting a critical nucleus was calculated to be 1.32 with the classical model and 48.1 with the atomistic model. The dependency of the nucleus size on the supersaturation ratio was relatively less with the atomistic model. In the calculation of critical nucleus size of materials like iron, the vapor pressure of which is very low, it would be desirable to use the atomistic model, rather than the classical model.
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박균영 ( Kyun Young Park ),이미선 ( Mi Sun Lee ),김민철 ( Min Cheol Kim ),이찬희 ( Chan Hee Lee ),박회경 ( Hoey Kyung Park ),강태원 ( Tae Won Kang ),정해성 ( Hae Seong Jeong ),한경아 ( Kyoung Ah Han ),허원회 ( Weon Hoe Huh ),유지 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.3
The chlorination of a metallurgical-grade silicon was carried out in a fluidized bed reactor, 25 mm in diameter. The flow rate of the chlorine admitted into the reactor was 0.2 L/min and that of the carrier nitrogen was 0.8~1.0 L/ min. The reactor temperature was maintained at 450℃ and the temperature of the coolant at the SiCl4 condenser was at -5℃. The SiCl4 yield increased with increasing the mole fraction of chlorine in the feed gas, exhibiting 28% at the mole fraction of 0.2. Further increase of the chlorine mole fraction was not attempted in a worry that the reactor might be failed due to the high exothermicity of the reaction. The production of SiCl4 from silicon by fluidized bed chlorination was demonstrated on a laboratory scale, which is a stepping stone for future studies under more severe conditions toward industrial application.
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