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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 7, Issue 5 - Dec 1998
Volume 7, Issue 4 - Sep 1998
Volume 7, Issue 3 - Sep 1998
Volume 7, Issue 2 - Jun 1998
Volume 7, Issue 1 - Mar 1998
Selecting the target year
Review of Heap leaching Technologies
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 3~12
The most recent research in precious metal processing is found in the increasing use of heap leaching for the extraction of gold from low grade ores and tailing dumps because heap leaching has several advantages compared to traditional milling. They include simplicity, lower capital and operating costs, faster starter-up time and environmental safety. In this paper, an attempt has been made to provide an overview of important factors involved in the implementation of heap leaching technology as a vehicle for gold extraction from its low grade ores. Brief discussions of the various important elements to this process has been made to ascertain the heap leaching characteristics, such as heap leaching chemistry, natural factors, ore preparation, heap and pad construction, solution collection system, pond system, metal extraction, and economical consideration.
A Study on the Properties of Electric Arc-Furnace Steelmaking Dusts for Stabilization Processing
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 13~18
This study was carried out to understand the properties of the E.A.F. steel-making dusts for stabilization processing. The properties are related to mincral composition, shape, particle size, magnetism, density, porosity and leaching characteristic. the dust particles, the size of which ranges from sub-micron to tens-micron, were mainly spherical like balls that were agglomerated each other: the large particles were generally Fe-rich and the small particles were spherical like balls that were agglomerated each other: the large particles were franklinite (ZnFe
), magnetite (Fe
) and zincite (ZnO) by XRD analysis. When the dusts were sieved by a wet process, the particle fraction over 200 mesh had 1.5 wt.% with magnetite and quartz. The particles in the size range of 200-500 mesh consisted of magnetite, franklinite. The 82 wt.% of the steel-making dusts were occupied by the particles finer than 500 mesh and contained franklinite and zincite as main mineralogical compositions. When the dusts of around 78% porosity compressed under the load of approximately 1 KPa, the porosity decreased to 68% and to 535 under around 13 KPa. When the E.A.F. dusts were leached according to the Korea standard leaching procedure on the waster, the heavy metals exceeding the leaching criteria were cadmium, lead and mercury.
High Temperature Thermal Behavior of EAF Dust by Coke at Initial Reaction Stage
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 19~25
High temperature thermal behaviors of EAF dust by coke at initial reaction stage were studied to obtain the fundamental data of EAF dust treatment process, that is Extended Arc Plasma Furnace System called RAPID system. In this study thermal behaviors including calcination of limestone, devolatilization of EAF dust itself, and reduction & devolatilization of mixture(EAF dust : coke : limestone = 80 : 10 : 10 wt.%) were investigated as functions of reaction temperature (1000~1300
) and reaction time (3~12 min), considering the 180% equivalence of carbon reduction and 1.7 bacisity for optimum reduction and melting of EAF dust in the RAPID system. Size of sample was about below 0.1 mm for these experiments. Limestone was completely calcined at above 1100
within 1 minutes. In the case of devolatilization of EAF dust itself, weight loss of EAF dust was about 14% at 1300
and 12 minutes, and partial sintering and melting were found in part of sample. Weight loss of mixtures increased with increasing reaction temperature and time, about 46% weight loss in it was occurred at 1300
and 12 minutes. From these weight losses showing devolatilization and reduction of EAF dust, the treatment time of EAF dust inside.
Separation of PVC and PET by Froth Flotation
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 26~32
Recycline of used plastics is rather restricted due to their variety and difficulties in their separation. In this study, a reliable and economical method for the separation of PVC which utilizes an appropriate control of surface chemistry of pariticles was suggested. this method consists of modification of PET surface from hydrophobic to hydrophilic by NaOH solution and subsequent separation by a froth flotation technique. Flotation results were in terms of NaOH concentration, digestion temperature and time, temperature and pH of solution, PVC concentration. They could be separated up to 95~100% by this method.
A Study on the Thermal Decomposition of Alunite
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 33~40
The formation reation of anhydrite (CaSO
) depends upon the amount and velocity of the SO
(g) and CaO(s) produced in the process of the thermal decomposition of alunite[K
] and limestone (CaCO
) respectively. Therefore, this study had carried out to investigate the amount and velocity of SO
(g) produced by roasting alunite and pyrolytic materials. In air, alunite was transfouned into KAl(SO
by dehydration at 500~580
. The dehydration velocity of alunite was found to be kt=(1-(1-
, the activation energy, 73.01 kcal/mol. SO
(g) ware slowly produced by the thermal decomposition of KAl(SO
, at 580~700
, rapidly, at 700~780
, The pyrolysis velocity of KAl(SO
was found to be kt=1-(1-
; activation energy, 66.84kcal/mol. The SiO
and kaolinite in alunite ore scarcely affected the temperature and velocity in which SO
(g) were produced.
Development of a Contact Angle Measurement Method Based Upon Geometry
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 41~45
A Hew way of contact angle measurement is derived based on simple geometrical calculation. Without using complicated contact angle measurement instrument. Just measuring the diameter and height of liquid lens made it possible to calculate the contact angle value with a reasonable reliability. To validate the contact angle value obtained by this method, contact angle of the same liquid lens is measured using conventional goniometer and it is verified that two values are nearly same within the limit of observational error.
A Study on the Recovery of Nitric Acid from Spent Nitric Etching Solutions by Solvent Extraction
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 46~51
A study has been on the recovery of nitric acid and valuable metals such as Fe, Cu, Sn, Pb, from spent nitric etching solutions. The effects of extractant of extractant type, concentrations, phase raios and selectivity from Fe, Cu, Sn, Pb on nitric acid extraction were studied. The results showed that TBP as an extractant for recovering of nitric acid was more effective than Alamine336, and the optimal concentration of TBP was found to be 60~70% of organic phase. Also, the nitric acid were only extracted by TBP from the spent etching solutions and the heavy metals such as Fe, Cu, Sn, Pb were not extracted above 0.1N nitric acid in spent etching solutions, From the analysis of McCabe-Thiele diagram, the extraction of 95% nitric acid is attained at a ratio of O/A=3 with five stages by 60% TBP and the stripping of 98% nitric acid from 80 g/l nitric acid in organic phase is attained at a ratio of O/A=1 with four stages by distilled water.
Effect of Si on the Corrosion Properties of Mg-Li-Al Light Alloy
Journal of the Korean Institute of Resources Recycling, volume 7, issue 5, 1998, Pages 52~57
Effect of Si in the electrochemical corrosion characteristics of Mg-Li-Al light alloy has been investigated by means of potentiodynamic polarization study. The elecrochemical behaviors were evaluated in 003% NaCl solution and the solution buffered with KH
NaOH at room temperature. It was found that the addition of very small quantity of Si (0.48 wt%) in Mg-Li-Al light alloy increased corrosion rates and amount of corrosion products and decreated the pitting resistance of the alloy. From the results it was concluded that Si which is added to increase the strength of Mg-Li-Al alloy is harmful to corrosion properties of the alloy.