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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Institute of Resources Recycling
Journal Basic Information
Journal DOI :
The Korean Institute of Resources Recycling
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Dec 2003
Volume 12, Issue 5 - Oct 2003
Volume 12, Issue 4 - Aug 2003
Volume 12, Issue 3 - Jun 2003
Volume 12, Issue 2 - Apr 2003
Volume 12, Issue 1 - Feb 2003
Selecting the target year
Recycling of Non-Ferrous Metals
Oh Jae-Hyun ; Kim Mi-Sung ; Shin Hee-Duck ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 3~19
Prior to discuss on recycling status and future prospects for the non-ferrous metals in the Korea, Japan and U.S.A. respectively, worldwide resources of non-ferrous metals and characteristics with recycling of non-ferrous metals are reviewed. In case of recovery non-ferrous metals, recycling of automobile shredder dust and E.A.F. dust are illustrated. Finally, the problems and technological developments associated with recycling of non-ferrous metals are summarized.
Manufacture of Nano-Sized Ni-ferrite Powder from Waste Solution by Spray Pyrolysis Process
Yu Jae-Keun ; Suh Sang-Kee ; Kang Seong-Gu ; Kim Jwa-Yeon ; Park Si-Hyun ; Park Yaung-Soo ; Choi Jae-Ha ; Sohn Jin-Gun ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 20~29
In order to efficiently recycle the waste solution resulting from shadow mask processing, nano-sized Ni-ferrite powder was fab-ricated through spray pyrolysis process. The average particle size of the powder was below 100nm. In this study, the effects of the reaction temperature. the concentration of raw material solution and the injection speed of solution on the properties of powder were respectively investigated. As the reaction temperature increased from
, average particle size of the powder significantly Increased and power structure became more solid, whereat its specific surface area was greatly reduced. Formation rate and crystallization of(
) phale increased along with the temperature rise. As the concentrations of iron and nickel components in wastere solution increased, particle size of the powder became larger, particle size distribution became more irregular, and specific surface area was reduced. Formation rate and crystallization of
phase increased significantly along with the increase of the concentration of solution. As the inlet speed of solution increased, particle size of the powder became larger, particle size distribution became wider, specific surface area was reduced and powder structure became less solid. As the inlet speed of solution decreased, formation rate and crystallization of
phase significantly increased.
Effect of Solution Temperature and Bath Concentration on the Kinetics with Dissolution Reaction of Zinc-Ferrite
Oh Iee-Sik ; Kim Chun-Jo ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 30~37
A kinetics study on the dissolution reaction of zinc-ferrite has been made with aqueous sulfuric acid in various temperature and concentration. Fraction reacted(R) and apparent rate constant(K) increased with increasing temperature and concentration of sulfuric acid solution. The rate of dissolution is shown by
for the initial stage of the reaction in aqueous sulfuric acid, where K is apparent rate constant, R is fraction reacted and t is reaction time, respectively. Activation energy associated with reaction was determined to be 16.3 kcal/mole. The dissolution of zinc-ferrite in sulfuric acid solution is dissolved by sto-ichiometric composition, but Fe and Zn did not dissolved, respectively.
Fundamental Studies on the Calcium Precipitation for the Reuse of Wastewater Containing Phosphate
Kim Yaung-Im ; Kim Dong-Su ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 38~43
Phosphate is an essential material for the growth of organisms. However. since relatively small amount is required. a large amount of phosphate is abandoned in wastes and wastewater. which contaminate the ecological environment including aquatic system. Purpose of this study is to treat especially high concentrated phosphate wastewater by use of calcium precipitation method. The pH range considered was from 6 to 12 and the maximum removal of phosphate was attained at pH 12. The con-centration of phosphate was observed to decrease rapidly until a half amount of calcium ion to its equivalent for the formation of calcium phosphate precipitate was added. which resulted in the decrease of the remaining concentration of phosphate down to 0.0027 mM. The effect of fluoride ion was examined and the concentration ratio between the phosphate and fluoride ion did not have any significant influence on the removal efficiency of phosphate. The effect of pH was also investigated. With the increasing of the pH in solution, the removal rate of phosphate was increased. Also it was investigated that the effect of fluoride on the phosphate removal was not significant.
Separation of wasted plastics by thermal adhesion
Lim Seok ki ; Cho Hee chan ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 44~50
Separation of mixed plastics is not a simple task due to similarities of specific gravity and limitations of sizes, etc. In this study, a new technique was developed to separate plastics selectively by a thermal adhesion method using the different softening or melting temperatures of various types of plastics. Tests were conducted to investigate softening or melting temperatures and adhesion probabilities of plastics with change in temperature. Tests also were conducted to analyze the operating variables, including contact times, size and color pigment. It was founded that LDPE, HDPE and PVC, PET, etc among mixed plastics could be separated selectively according to the change of temperature.
Preparation of TaC Powder from the Waste of Ta powder Fabrication Process for Capacitor
Park Je-Shin ; Suh Chang-Youl ; Yaon Jae-Sik ; Bae In-Sung ; Park Hyeoung-Ho ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 51~57
Using the wastes of Ta powder fabrication process for capacitor, TaC powder was synthesized by SHS method. In previous to synthesis, the waste Ta was needed of milling and deoxidization treatments for active reaction and prevention of oxidation. In SHS reaction, it was found that the TaC single phase was obtained in composition of 5～6wt.％C. The reaction temperature was affected by the compaction pressure of the specimens, exhibiting the maximum values at 1600psi, respectively.
Preparation of Refuse-Derived-Fuel from Automobile Shredder Residues
Lee Hwa-Yaung ; Oh Jong-Kee ; Kim Sung-Gyu ;
Journal of the Korean Institute of Resources Recycling, volume 12, issue 4, 2003, Pages 58~64
A study on the preparation of RDF with ASR materials from shredder line of end-of-life vehicles has been peformed by using hot molding method. ASR materials used in the work were plastics, fibers and sponge which were cut by less than 10 mm in size prior to hot molding and 40, 60 and 80 mm mold in diameter were employed for RDF forming. It was found that heating temperature, heating time and mixing ratio of materials played an important role in the hot molding of ASR materials. Density of RDF samples Prepared in the work was in the range of 0.5∼0.9gr/ml depending on the hot molding conditions and it was decreased with increase in the content of sponge. Breaking strength of RDF samples was observed to 0.8∼3.0MPa and it was also increased with increase in density of RDF samples. Finally, when heating temperature was elevated, density of RDF was increased due to Increase in molten part of ASR materials which resulted in the enhancement of breaking strength of RDF.