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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 16, Issue 6 - Dec 2007
Volume 16, Issue 5 - Oct 2007
Volume 16, Issue 4 - Aug 2007
Volume 16, Issue 3 - Jun 2007
Volume 16, Issue 2 - Apr 2007
Volume 16, Issue 1 - Feb 2007
Selecting the target year
Current Status of Magnesium Smelting and the Related Recycling Topics
Park, Hyung-Kyu ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 3~11
It is to review the current status of magnesium smelting. Raw materials for magnesium source, worldwide production and producers of metallic magnesium, Korean magnesium markets and some important extraction technologies were reviewed. The magnesium extraction technologies were described according to the two major reduction methods: the fused salt electrolysis and the thermal reduction method. Also, the research on the extraction of magnesium from magnesite which has been being carried out at KIGAM was briefly introduced with discussing the related topics on the recycling of the chlorine and the hydrogen chloride gas used in the process.
The Effect of Oxidation/Reduction of Sulfide Mineral on Its Recovery by Flotation
Kim, Dong-Su ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 12~16
The influence of oxidation on the floatability of sulfide minerals contained in mine failings has been investigated employing chalcopyrite as a target material. The critical surface tension of chalcopyrite was estimated to be about 15.5 dyne/cm based on Zisman plot and the floatability of chalcopyrite was observed to increase with the concentration of collector. The enhanced float-ability of chalcopyrite at its initial stage of oxidation was considered to be due to the transformation of disulfide to elemental sulfur and the decrease in its floatability at further oxidation was presumably caused by the formation of sulfate and/or disulfur trioxide from elemental sulfur. When the oxidized chalcopyrite was reduced, its floatability was increased and the variation of the critical surface tension of chalcopyrite according to tile oxidation/reduction was interpreted by an energy diagram constructed by different bond energies between atoms.
A Study on the Application of Recycled Fine Aggregate under Sulfate Environment
Lee, Seung-Tae ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 17~22
The report of an investigation into the performance of mortar specimens made with recycled fine aggregate (RA) exposed to sodium sulfate solution for 360 days is presented in this paper. Mechanical properties of mortar specimens such as visual examination, compressive strength, expansion and mass loss were periodically monitored. From the test results, it was found that mortar specimens with higher replacement levels of Rh exhibited poor performance in sodium sulfate solution. However, compared to mortar specimens without RA, those with lower replacement levels of RA (up to 50% by mass) was more resistant to sulfate attack. Through the x-ray diffraction analysis, it was confirmed that the main products causing sulfate deterioration in RA mortar specimens were the formation of gypsum and thaumasite.
Crystallization of Neodymium carbonate from Neodymium Chloride Solution
Kim, Chul-Joo ; Yoon, Ho-Sung ; Kim, Joon-Soo ; Lee, Seung-Won ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 23~31
In this study, the crystallization of neodymium carbonate from neodymium chloride solution by addition of ammonium bicarbonate was investigated. The concentration of reactants such as neodymium chloride and ammonium bicarbonate, and reaction temperature play an important part in order to obtain the crystal of neodymium carbonate. It seemed that amorphous neodymium carbonate was prepared by aggregation of primary particles formed through nucleation. If reaction rate was increased by increasing the concentration of reactants and reaction temperature, then neodymium carbonate crystal could be obtained. Lanthanite-type neodymium carbonate[
] and tengerite-type neodymium carbonate[
] could be obtained with reaction renditions. Lanthanite-type neodymium carbonate was sensitive to temperature. The thermal decomposition of neodymium carbonate contained the processes or dehydration, decarbonation and crystalization of
. The shape of lanthanite-type neodymium carbonate was irregular lump type, and tengerite-type neodymium carbonate had the shape of needle type. The shape of
was affected by the shape of neodymium carbonate.
A Study on the Characteristics and Utilization of Ash from ASR Incinerator
Lee, Hwa-Young ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 32~39
The measurement of physicochemical properties of ASR incineration ash has been carried dot and the preparation of light-weight material has also been performed using ASR ash for recycling point of view as building or construction materials. For this aim, chemical composition, particle size distribution, and heavy metal leachability were examined for 2 bottom ashes and 4 fly ashes obtained from the domestic ASR incinerator. In the present work, attempt has been made to prepare the lightweight material using boiler ash as a raw material, which is prepared by forming the mixture of boiler ash, lightweisht filler and inorganic binder and followed by calcination at elevated temperature. As a result, the content of Cu in bottom ash was as high as about 3wt% so that the recovery of Cu from ash was required. The major compound of SDR #5 and Bag filter #6 was found to be
, respectively. It is thought that heavy metal teachability of lightweight material prepared with boiler ash was significantly decreased due to the encapsulation or stabilization of heavy metal compounds.
Recycling of the Bottom Ash, Sourced from the Local MSW (Municipal Solid Waste) Incinerators, as a Fine Sand for Concrete
Lim, Nam-Woong ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 40~47
This paper described recycling of the bottom ash, sourced from the local incinerators as a fine sand for concrete. 10% bottom ash was substituted for the ordinary beach sand in the mortar(on a weigh basis), in conjunction with the pozzolznic diatomite. The specimens were tested according to KS L 5105 and analysed by TCLP(Toxic Chemical Leaching Procedure). The results showed that the hazardous heavy metals in the bottom ash are within the maximum permissible limit of TCLP. The compressive strength of the mortar with 10% bottom ash was highly improved, compared to the control mortar when the pozzolanic diatomite was used. It revealed that the hazardous heavy metals of the mortar with 10% bottom ash were leached within the maximum permissible limit of TCLP. It was concluded that the bottom ash can be reused as a fine sand for concrete when the pozzolanic diatomite was used as a stabilizer.
Synthesis of Low-Priced Catalyst from Coal Fly Ash for Pyrolysis of Waste Low Density Polyethylene
Jeong, Byung-Hwan ; Na, Jeong-Geol ; Kim, Sang-Guk ; Mo, Se-Young ; Chung, Soo-Hyun ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 48~55
A low-priced catalyst for pyrolysis of LDPE has been synthesized. Fly ash, which is waste material generated from coal-fired power plants was used as silica and alumna sources for solid acid catalyst. Amorphous silica-alumina catalysts (FSAs) were pre-pared by dissolution of silica and alumina from fly ash, followed by co-precipitation of the dissoluted ions. A series of LDPE pyrolysis were carried out in a thermogravimetric analyzer to investigate the effects of synthesis conditions such as NaOH/fly ash weight ratio and activation time one catalytic performance of FSAs. The physical properties of FSAs were examined and related to their catalytic performances. FSA(1.2-8) synthesized with NaOH/fly ash weight ratio of 1.2 and the activation time of 8 hours showed the best catalytic performance. The catalytic performance of FSA(1.2-8) was comparable with that of commercial catalysts and it was concluded that the FSA could be a good candidate for catalytic use in the recycling of waste polyolefins.
A Study on Material Separation of Heavy Group Plastics by Triboelectrostatic Separation
Jeon, Ho-Seok ; Baek, Sang-Ho ; Park, Chul-Hyun ; Kim, Byoung-Gon ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 56~62
In this study, we carried out the research on triboelectrostatic separation for heavy group plastics (PET, PVC) recovered from wet gravity separation. From the research on charging characteristic for the choice of charging materials, it was found that PP was optimum charging material to make high charging amount with opposite polarity for PET and PVC of heavy group. Therefore, we manufactured a charger of cyclone type using PP material for separation of PET and PVC. At optimum test conditions that used PP cyclone charger developed in this study, we developed a triboelectrostatic separation technique that can separate PET plastic up to grade of 98.5% and recovery of 86.2%. We established new separation technology that could recycle the PET and PVC heavy group plastics recovered from wet gravity separation.
A Study of the Research Trends and the Material flow on the Unrecycled Materials in Korea - The Current Situation of Recycling Technology for Waste Resources in Korea(2) -
Oh, Jae-Hyun ; Kim, Mi-Sung ; Shin, Hee-Duck ; Min, Ji-Won ;
Journal of the Korean Institute of Resources Recycling, volume 16, issue 2, 2007, Pages 63~76
Typical examples as unrecycled materials in Korea were Zinc from the electric arc furnace dust (EAF Dust), and Moiybdenium and Vanadium from the desulfurizing spent catalyst of petrochemical industries. In the otherwise, though recovery of valuable metals from the waste electronic scrap such as printed circuit boards (PCBs) and platinum group metals (PGM) from the waste automobile catalyst have been interesting issues, it is difficult to collect the exact informations or statistics on their material flow system. In this article, The current domestic research trends for unrecycled or less recycled materials have been reviewed, and material flow and recycling technologies on the desulfurizing spent catalyst were surveyed.