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金燦國,姜大雨,金裕鎭 동아대학교 공과대학 부설 한국자원개발연구소 1984 硏究報告 Vol.8 No.2
This study has been carried out to determine the effects of bridging liquid concentrations, agitation time, agitation speed, pulp density, and viscosities of the bridging liquid on growth of the agglomerates by agitating the suspension with bridging liquid which preferentially wets the carbon particles. The results of this experiment are as follows : 1) As larger amounts of bridging liquid are used, the size of agglomerates are increased until the end of the capillary region of pore filling after which there is an excess of bridging liquid. 2) At the initial stage of the agitation, the size of agglomerates are increased while after a certain agitation period, the size of agglomerates are decreased because destructive force is increased by frequency of collisions between the agglomerates themselves and their adhesion to the walls of the vessel. 3) The diameter of the final agglomerates are determined by a balance between destructive and cohesive forces acting on agglomerates.
김찬국 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.2
A study was performed for determination of the trace amount of Selenium by A.A.S. with hydride generation method. The procedure is as follows ; transfer 40㎖ of sample solution and 20㎖ of HCl to a reaction vessel and inject 3% NaBH₄solution with a flow rate of 3㎖/min for 45 seconds. H₂Se gas is generated from the sample solution by passing nitrogen gas is introduced into an absorbing solution through a sintered glass filter. Then transfer it into 100㎖ beaker and add 3㎖ of HNO₃solution. Heat on a hot plate at 150℃ to evaporate slowly to about 2∼3㎖. Then add 10㎖ of 6M-HCl to the solution and heat to about 125℃ for reduction of Se(Ⅵ) to Se(Ⅳ). The selenium contents of the concentrated samples were determined by A.A.S. with hydride generation. This method is excellent for the determination of Selenium in view of conveniency, rapidity, high sensitivity and good reproducibility.
金燦國,李成植 동아대학교 공과대학 부설 한국자원개발연구소 1982 硏究報告 Vol.6 No.1
Adsorption characteristics of nickel ion on demestic activated carbon were studies by using three kinds of sources. The following conclusion were obtained from the effect of pH, halides, cyanide and temperature, and adsorption velocity, adsorption isotherms on adsorption of nickel ion and the desorption of nickel ion from domestic activated carbon. 1) Nickel ion was reversibly adsorpted on activated carbon in the form of complex anion such as NiX^(2-)₄ and Ni(CN)^(2-)₄. Specially, the order of the magnitude of adsorption of halogenide ions was I^(-)>Br^(-)>CI^(-)>F^(-) which coinsided with that of hydrolysis tendency of halogenide ions. 2) From the adsorption of nickel ion in the presense of zinc ion, it was found that zinc ion prevented nickel ion from adsorption on activated carbon. 3) The adsorption isotherms of nickel ion on domestic carbons were well fitted Freundlich's equation. 4) Nickel complex anions on activated carbon were easily eluted by using 0.1N HCl solution.
金燦國,金相烈,李成植 동아대학교 환경문제연구소 1980 硏究報告 Vol.4 No.1
Adsorption characteristics of chrome, cadminum, cupper and zinc ions on domestic activated carbon were studied by using two kinds of sources. The following conclusions were obtained from the effect of pH, anions and cyanide, adsorption velocity, adsorption isotherm on adsorption of the heavy metal ion and the desorption of the heavy metal ion from domestic activated carbon. 1) Chrome ion is readily adsorpted on activated carbon in the form as HCrO₄^(-) and CrO₄^(2-) in the pH range from 3 to 6 and adsorption velocity was almost come to the equilibriumin an hour. Adsorpted total chrome ion was readily eluted by using 1N-HCl. 2) From the adsorption of cadmium ion in the presense of iodide and bromide, cupper ion with halogen ion and zinc with halogen, it was found that they were easily adsorbed on activated carbon in the form of complex anions. 3) Adsorption isotherms of cupper with citric acid and zinc with cyanide on activated carbon were shown the Freundlich's equation. 4) Zinc complex anions were reversibly adsorbed on activated carbon and easily eluted with 0.1N-HCl.