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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 24, Issue 6 - Dec 2015
Volume 24, Issue 5 - Oct 2015
Volume 24, Issue 4 - Aug 2015
Volume 24, Issue 3 - Jun 2015
Volume 24, Issue 2 - Apr 2015
Volume 24, Issue 1 - Feb 2015
Selecting the target year
Performance Degradation of Cement Composite Containing Municipal Solid Waste Incinerator Ash by Unburned Fabric
Kim, Hyeong-Ki ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 3~11
DOI : 10.7844/kirr.2015.24.4.3
The negative effects of unburned fabric in municipal solid waste incinerator (MSWI) ash on the performances of cement composite were investigated. The chemical and physical characteristics of MSWI ash powder containing high volume of unburned fabric were analyzed. The workability and compressive strength of mortar-type cement composites with the ash powder were evaluated. The workability of the cement composites was decreased mainly by unburned fabric in the ash, while the compressive strength was decreased by MSWI ash itself. From the experimental results, the critical limits for both MSWI ash and their powder containing unburned fabric in the cement composites should be limited from standpoint of the workability of the composite.
Characteristic of Flotation for Recovery of Copper from Copper Slag in Kazakhstan
Park, Jayhyun ; Choi, Uikyu ; Choe, Hongil ; Shin, Shunghan ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 12~21
DOI : 10.7844/kirr.2015.24.4.12
Almost all copper slags contain a considerable amount of Cu (0.5 - 3.7%) close to or even higher than copper ores. A number of methods for metal recovery from copper slag were reported These methods can be classified into three categories, flotation, leaching and roasting. Sulfide flotation method for the recovery of copper from Kazahstan copper furnace slag is discussed in this investigation. 50% of copper from the slag was recovered by sulfide flotation at pH 4. meanwhile 67% of copper from the slag was recovered at pH 11. Higher copper recovery result at pH 11 rather than that at pH 4 was caused by the fact that copper sulfides were floated in particle size fraction over
in concentrates at pH 11. When the slag were ground below
by ball milling, the recovery of copper by floation in slag improved to 78 - 83% because of copper liberation effect.
Formation Behavior of Precipitated Calcium Carbonate Polymorphs by Supersaturation
Ahn, Young jun ; Jeon, ong Hyuk ; Lee, Shin Haeng ; Yu, Young Hwan ; Jeon, Hong Myeong ; Ahn, Ji Whan ; Han, Choon ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 22~31
DOI : 10.7844/kirr.2015.24.4.22
From results obtained by adjusting experimental variables based on the kinetic, the nucleation rate for formation of precipitated calcium carbonate (PCC) was investigated. Formation behavior of PCC was investigated for various concentrations of NaOH solution and
addition methods in the
slurry. The range of nucleation rate was investigated for dissolution rates of major ion concentrations,
. In case of high concentration of major ions, vaterite and calcite were synthesized. The high nucleation rate was achieved for lower either
ion concentration, calcite was mainly synthesized and when concentration of major ions was low, aragonite was synthesized. Furthermore, the formation of calcite was decreased with increasing concentration of NaOH. homogeneous aragonite could be obtained by addition 5 M NaOH. Therefore, in this study, specific shape of polymorphs could be prepared through controlling supersaturation.
High Pressure Leaching of Matte Converted from Cobalt Concentrate from Democratic Republic of the Congo
Kim, Gunha ; Kang, Ga-hee ; Kim, Sookyung ; Sohn, Jeongsoo ; Kwon, Kyungjung ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 32~37
DOI : 10.7844/kirr.2015.24.4.32
Cobalt is abundant only in some countries including Democratic Republic of the Congo. It would be necessary to secure overseas Co ores and Co extraction technology. Two kinds of matte varying the sulfur content were manufactured by smelting reduction of Co concentrate containing ~8 wt% Co, ~19 wt% Cu, and ~3 wt% Fe. The amount of Co, Cu and Fe was concentrated to 19~21 wt%, 39~41 wt%, and 7~9 wt% respectively in the resulting matte. High-pressure leaching of matte was performed in an autoclave with considering the effect of oxidizing agent,
concentration as a lixiviant, and the amount of sulfur added to the matte. An oxidizing agent (oxygen) is necessary to improve Co leaching efficiency enabling usage of a dilute
leaching agent. An increase in
concentration prevents selective leaching of Co, and the sulfur content in matte has a minor influence on the Co leaching efficiency.
Overview and Recent Development of Recycling Small Waste Electrical and Electronic Equipment (WEEE)
Jung, Insang ; Park, Jihwan ; Hwang, Jongsoo ; Choi, Wonhee ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 38~49
DOI : 10.7844/kirr.2015.24.4.38
The importance of recycling came to the fore by increasing of waste electrical and electronic equipment(WEEE) generation. Small WEEE recycling in particular represents a big challenge in Korea because it has various items and components. Main materials of small WEEE are typically well known for metals (copper, iron, aluminum, etc.), PCBs and plastics. Not only Korea but also overseas, the laws for small WEEE were in effect in order to recycle effectively, but the technology is not catched up with the regulation which has to recycle an allocated account of WEEE. In addition, recycling technologies and processes for small WEEE are not developed enough to recycling center properly. In that sense, if we develope the recycling process, have not only technology competitiveness but also resource conservation, improving the environment and economic profits. Therefore, through the analysis of economic value of recycled small WEEE, and current technologies both domestically and internationally, we design conceptual recycling process of small WEEE, and consider the way forward.
Fabrication of High Purity Ga-containing Solution using MOCVD dust
Lee, Duk-Hee ; Yoon, Jin-Ho ; Park, Kyung-Soo ; Hong, Myung-Hwan ; Lee, Chan-Gi ; Park, Jeung-Jin ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 50~55
DOI : 10.7844/kirr.2015.24.4.50
In this study, we have investigated solvent extraction of Ga and recovery of high pure Ga solution from MOCVD dust for manufacturing of LED chip. Effect of extractan, concentration of extractant were examined for choosing the more effective extractant and high pure Ga solution was fabricated by multi-stage extraction/stripping process. For extraction/separation of Ga based on the analysis of raw-material in previous study, 3 different extractants PC 99A, DP-8R, Cyanex 272 has been investigated and the extraction efficiency of 1.5 M Cyanex 272 was 43.8%. It was conformed that extraction efficiency of Ga was 83% in multi-stage extraction and 5N high purity Ga stripping solution without impurities also obtained.
Fine Particle Classification and Dewatering of Tailing Using Hydrocyclone
Kim, Jonggeol ; Yoo, Kyoungkeun ; Choe, Hongil ; Choi, Uikyu ; Park, Jayhyun ; Alorro, Richard Diaz ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 56~60
DOI : 10.7844/kirr.2015.24.4.56
Fine particle classification was performed using products obtained from primary classification process after flotation for efficient application of tailing. The cut size increased with decreasing input pressure from 0.1 MPa to 0.3 MPa and increasing pulp density from 5% to 15% using 2-inch hydrocyclone. The median sizes of overflow and underflow were
, respectively at 0.3 MPa with 5% pulp density. The imperfection became closed to ideal separation with increasing the pulp density and decreasing the input pressure. The water content decreased with increasing the pulp density, but the effect of input pressure could be ignored. The water content of underflow was 27.9% at 0.3 MPa with 15% pulp density.
The Current Status of Cyanide Uses, Regulations, and Treatment in Gold Mining
Park, Jeonghyun ; Shin, Doyun ; Park, Hyunsik ; Jeong, Jinki ; Lee, Jae-chun ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 61~66
DOI : 10.7844/kirr.2015.24.4.61
Cyanidation has been used worldwide to recover gold from primary ore or concentrate. The use of cyanide is however becoming an emerging issue because of the toxic residue and wastewater made from the process. The cyanide-containing wastewater should be treated properly, obeying the environmental standard and regulations. In the present article, the domestic and international uses, regulations, and treatment technologies of cyanide in gold mining were investigated as a feasibility study to develop a cyanide treatment process as well as the cyanidation process. A biological cyanide treatment process to develop a zeroemission gold recovery and wastewater treatment process was also briefly introduced.
Evaluation of Some Rare Metals and Rare Earth Metals Contained in Coal Ash of Coal-fired Power Plants in Korea
Park, Seok-Un ; Kim, Jae-Kwan ; Seo, Yeon-Seok ; Hong, Jun-Seok ; Lee, Hyoung-Beom ; Lee, Hyun-Dong ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 4, 2015, Pages 67~75
DOI : 10.7844/kirr.2015.24.4.67
The content distributions of some rare metals and rare earthe metals in coal ash (fly ash, bottom ash and pond ash) and leachate from coal-fired power plants were investigated. In case of Yttrium (Y) and Neodymium (Nd) which were strategic critical elements, their contents were ranged from about 23 ~ 75 mg/kg and it is shown they are worth to be developed for the recovery and separation method. Considering the annual amount of fly ash and bottom ash and pond ash, coal-fired power plants have great value of about 1,670 billion KRW and it is regards they are worthy as urban mines.