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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 13, Issue 6 - Dec 2004
Volume 13, Issue 5 - Oct 2004
Volume 13, Issue 4 - Aug 2004
Volume 13, Issue 3 - Jun 2004
Volume 13, Issue 2 - Apr 2004
Volume 13, Issue 1 - Feb 2004
Selecting the target year
Synthesis of Hydroxyapatite as the Artificial Bone Materials from Phosphate Wastewater Simulating Human Body Fluid
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 3~11
Basic studies have been conducted regarding the crystal formation of hydroxyapatite which was produced in the treatment process of phosphate-containing wastewater using calcium ions as the precipitating agent for its employment as the material for artificial bones. The precipitation of hydroxyapatite were conducted in the synthetic solution which simulating human body fluid for its increased applicability. Ca(
O and (
were employed for the precipitation of hydroxyapatite and its composition was analyzed after drying at 80oC. The thermal behavior of precipitate was investigated by examining the change in its crystalline structure according to the sintering temperature. DTA/TG analysis showed that the escape of moisture from the precipitate occurred at ca.
and the decomposition of ammonia and the evaporation of lattice water were brought about at around
. X-ray diffraction analysis indicated that the thermally treated precipitate consisted mainly of hydroxyapatite. For dried precipitate, the bonds in the component materials which used for the precipitate formation were observed by FT-IR, and after thermal treatment the major bonds in the precipitate were shown to be
, which were main comprising bonds of hydroxyapatite.
A Comparative Study of Dewatering Aid for Digested Sludge by using A Starfish and A Shell
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 12~18
A study on the enhancement of the dewaterability of sewage sludge was carried out by using the sea waste materials as a dewatering aid. It was made from a starfish and a shell by heating at
and centrifuge and belt press were used as a mechanical dewatering process. The moisture content of sludge cake was reduced by 15∼22% (w/w) after addition of the dewatering aid at the dose of 1∼8 g/100mL of digested sludge. CST (capillary suction time) was measured to evaluate the effect of dewatering aid on sludge dewatering properties. CST was reduced after addition of a shell while increased after addition of a starfish. Enhancement of dewaterability after addition of a shell was better than that of a starfish. The heating temperature effect of the dewatering aid on dewaterability was not clear.
Utilization of Scheelite Mine Tailing as Raw Material of Ordinary Portland Cement
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 19~26
In order to use the mine tailing which was generated in the flotation process of scheelite ore into the raw material of ordinary portland cement, the characteristics of the prepared cement clinker was investigated. Scheelite mine tailing is composed of 68.8% of
, 8.6% of
, 10.8% of
, 5.0% of CaO, respectively. It exists as
-quartz, muscovite, clinochlore and has 8.0% of 88
residue. When LSF, SM, and IM of the raw materials (such as limestone, convertor slag, fly ash, and mine tailing) are 91.0, 2.60, and 1.60, respectively, the burnability index of the raw materials is 50.7, the crystal size of
S in the prepared clinker is 15∼35
, and about 3.8% of scheelite mine tailing can be used as raw material.
Regeneration of Spent Nickel Catalyst for Hydrogenation
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 27~36
Nickel oxide was recovered through roasting of a spent catalyst for hydrogenation reaction. Nickel on Kieselguhr catalysts were prepared by a precipitation method after a treatment of the recovered-nickel oxide with an acid. Effects of roasting temperature of the spent catalyst on recovery of nickel oxide was investigated. Most of nickel oxide could be recovered through roasting of the spent catalyst at
. In regeneration of catalysts by the precipitation method after the treatment of nickel oxide with an acid, the effect of promoter, precipitation condition and reduction condition on catalytic performance in vegetable oil hydrogenation were investigated. The addition of CaO or
resulted in an increase of catalytic activity.
Chemical structure and PVC shape after dehydrochlorination of PVC
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 37~42
PVC powder was dehydrochlorinated by hydrothermal reaction at reaction time 0∼5 hr, reaction temperature
in 0∼2M NaOH solution, and shape and structure of the PVC residue was investigated. The shape of the residue was changed largely according to NaOH concentration. Most of the residue was cohered in the aqueous solution, and many pores less than 10
were formed on the surface. Dense network structure was well developed inside the residue. On the other hand, the residue in the NaOH solution was not cohered and its shape is roughly spherical. In the IR spectrum of the residue both in water and NaOH solution at
, aromatic rings and absorption peak by C=C double bond were observed. From the results, it was observed that aromatic circle reaction and bridge reaction occured inter and intra molecules.
The Effect on Mixed Ratio of Recycled Engineering plastic Resin on the Shrinkage in Molded Parts
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 43~49
In this study. an experimental work was performed to mold tensile specimens by using the injection molding machine. Melt temperature, mold temperature and the mixed ratio of recycled resin were selected as processing parameters for studying the effect of those conditions on the shrinkage and weight of molded parts. As a result, the shrinkage was increased with the higher mold and melt temperature and it was more sensitive to the change of mold temperature. On the other hand, the weight of molded parts was decreased with the increment of mold and melt temperature.
Test Run of Pilot Plant for Recycling of the Leached Residue in the Processing of Waste Aluminum Dross
Journal of the Korean Institute of Resources Recycling, volume 13, issue 3, 2004, Pages 50~57
Waste aluminum dross is a major waste in the aluminum scrap smelters and its components are mostly alumina and remained metallic aluminum. In the process to extract the remained aluminum from the waste dross by leaching with sodium hydroxide solution, residue is generated and its main component is alumina. This residue could be recycled into ceramic materials such as alumina castable refractories by going through a series of treatments such as washing, drying and roasting. In this study, a pilot plant was constructed and tested to demonstrate the developed technology. One thousand tons of waste aluminum dross could be processed, and about seven hundred tons of ceramic materials produced in the demonstration line. From the test run of the pilot plant, although it was confirmed that the developed technology could be applied to commercialization, several technical improvements were found to be necessary for reducing impurities such as Na, Fe and for reforming drying equipment.