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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 :
Ji Whan Ahn
Volume & Issues
Volume 23, Issue 6 - Dec 2014
Volume 23, Issue 5 - Oct 2014
Volume 23, Issue 4 - Aug 2014
Volume 23, Issue 3 - Jun 2014
Volume 23, Issue 2 - Apr 2014
Volume 23, Issue 1 - Feb 2014
Selecting the target year
A Review on Recycling of Spent Autocatalyst in Korea
Kwon, Young-Shik ; Lee, Jae-Chun ; Shin, Do Yun ; Yi, Seung-Hoon ; Kim, Hyung-Jin ; Choi, Yoon-Geun ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 3~16
DOI : 10.7844/kirr.2014.23.1.3
Recycling of spent autocatalyst that includes the platinum group metals (PGMs), namely palladium, platinum and rhodium, is a very profitable endeavor. In order to ensure an efficient promotion of an appropriate policy-making and the technical development of the recycling process of spent autocatalyst in Korea, the generated amount, trading conditions, and recycling technology for spent autocatalyst were surveyed. The generated amount of spent autocatalyst was estimated by analyzing the domestic statistical data of registration & disuse of automobiles and the records of autocatalyst installation to new cars. The review of the recycling technology was carried out by surveying the recycling processes of `Heesung PMTech Ltd.`, which is the largest company in the recycling industry for spent autocatalyst in Korea. In addition to the above, some policy suggestions for the improvement of recycling industries for spent autocatalyst were offered.
Solvent Extraction for the Separation of Nd and Pr from Chloride Leaching Solution of Monazite Sand
Park, Ju-Ho ; Jeon, Ho-Seok ; Lee, Man-Seung ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 17~24
DOI : 10.7844/kirr.2014.23.1.17
Solvent extraction experiments have been performed to separate Nd and Pr from chloride leaching solution of monazite sand using PC88A and D2EHPA. For this purpose, the effect of the saponification of PC88A and D2EHPA on the extraction and separation of the two metals were studied by varying the pH of aqueous solution. In the experimental ranges conducted in this study, the distribution coefficients of Nd were higher than those of Pr and separation factor value increased with the increase of solution pH. Saponification of PC88A enhanced the distribution coefficients of Nd and Pr as well as the separation factor. Saponification of D2EHPA had some effect on the extraction of the two metals but little effect on the separation factor.
Development of Reuse Process Through Recovery and Refinement of Precursor for LED
Yang, Jae Yeol ; O, Byung Sung ; Yoon, Jae Sik ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 25~32
DOI : 10.7844/kirr.2014.23.1.25
The purpose of this research is to develop a process and a system to collect, purify and reuse the residual quantity of trimethylgallium, used as a raw material, upon GaN epitaxial growth for LED from a metal organic chemical vapor deposition(MOCVD) equipment. This research reviews whether TMGa collected from the process can be used through a chemical and structural characteristics evaluation. As a result of analyzing the purity using ICP-MS and ICP-AES, 7N high purity (99.99999%) of TMGa was obtained. According to checking the structural change of TMGa through NMR analysis, TMGa having pure
structure was obtained without structural change. For reliability review of the collected TMGa, u-GaN was deposited using the MOCVD process and an structural, optical and electrical characteristics evaluation was conducted. As a result, it was found out that the reuse was possible.
Copper Solubility in Al
Han, Bo-Ram ; Kim, Eung-Jin ; Sohn, Ho-Sang ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 33~39
DOI : 10.7844/kirr.2014.23.1.33
In this study, the solubility of Cu, which is a main metal component of wasted PCB, in
slag system was investigated. Each 20 grams of Cu chips and the quaternary slag manufactured was placed in an carbon crucible and melted for 10 hours in the temperature between 1673 K and 1825 K to confirm the equilibrium state. The oxygen partial pressure was controlled by the ratio of CO and Ar gas in the range of
atm. The concentration of Cu in the slag increased with increasing oxygen partial pressure, slag basicity, and MgO content in the slag. The concentration of Cu in the slag decreased with increasing temperature. The Cu dissolution reaction in the slag is an exothermic reaction.
Application of Unburned Carbon Produced from Seochun Power Plant
Lee, Sujeong ; Cho, Seho ; Lee, Young-Seak ; An, Eung-Mo ; Cho, Sung-Baek ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 40~47
DOI : 10.7844/kirr.2014.23.1.40
Feasibility of utilizing unburned carbon residue in coal ash as a potential precursor for the production of activated carbon was assessed to seek for solution to recycle unburned carbon residue. The unburned carbon concentrate generated from the 4 stages of cleaner flotation has a grade of 87% carbon. The crystalline impurities in the concentrate included quartz and mullite. Unburned carbon had a low specific surface area of
, which might be related to a high degree of coalification of domestic anthracite coal. Carbon particles were mostly porous and have a turbostratic structure. When 1g of carbon was activated with 6g of KOH powder, the highest specific surface area value of
was achieved. Low wettability of unburned carbon particles, which was resulted from high temperature combustion in a boiler, might cause poor pore formation when they were activated by KOH solution. The activated carbon produced in this study developed micropores, with an equivalent quality of general-purpose activated carbon made from coal. Hence, it is concluded that chemically treated unburned carbon can be used for water purification or an alternative to carbon black as it is.
Effect of Solvent on the Grafting Polymerization of Polyethylene Wax with Maleic anhydride
Yu, Si-Won ; Choi, Joong-So ; Na, Jae-Sik ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 48~57
DOI : 10.7844/kirr.2014.23.1.48
In this study, we have investigated the influence of the nature of solvent on the grafting reaction of maleic anhydride onto polyethylene wax obtained as a by-product in a high density polyethylene plant. The results show that the grafting ratio in xylene as a solvent was higher than toluene. This is because xylene has excellent monomer solubility, swelling property and miscibility. It has been also observed that grafting degree shows an initial jump in percentage of grafting with increasing amount of solvent, from 0% v/w to 200% v/w giving maximum grafting in 200% v/w and then slightly decreases on further increase in the amount of solvent and becomes almost constant. It can be also seen that gel content was not formed under the use of solvent. It means that solvent prevented cross-linking reaction due to chain transfer reactions to solvent molecules. Studies of melt viscosity at
showed that viscosity increased after grafting of maleic anhydride onto polyethylene wax.
A Study on Roasting Refinement of Crude-ZnO from Electric Arc Furnace Steel Dust
Yoon, Chi Hyun ; Lee, Myungwon ; Seo, Junghwa ; Yoon, Jaehong ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 58~63
DOI : 10.7844/kirr.2014.23.1.58
Variety of volatile materials is present in crude-Zinc oxide recovered from EAFD(Electric arc furnace steel dust). Commonly, it is purified by oxidizing roasting. In this study, spherical each specimen prepared crude-zinc oxide like 1~3 mm and 10 mm was tested in vertical tube furnace at the temperature range
in oxidizing atmosphere. Oxidizing roasting properties of zinc oxide were investigated using XRD, XRF and ICP-OES. At temperature blow
volatilization rate were remarkably low. As the temperature increases, the concentration of Zn increased and the concentration and XRD peaks of impurities decreased. The result indicated that volatilization rate depended on specimen size and roasting temperature.
Bioleaching Behavior of Cu and Co by Aspergillus Niger Strains from Molasses Culture
Ahn, Hyo-Jin ; Ahn, Jae-Woo ; Ryu, Seong-Hyung ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 64~69
DOI : 10.7844/kirr.2014.23.1.64
For the recovery of Co and Cu, bioleaching behavior of Co, Cu, Fe, Mg, Al by Aspergillus niger culture from the molasses growth medium was investigated. Series of leaching tests have been conducted by varying Aspergillus niger`s type, molasses concentration in the growth medium, pulp density and reaction time. The results showed that increase of the molasses concentration in the growth medium from 1% to 4% increased the leaching percentage of Co and Cu and the optimal molesses concentration was found to be 4% in the growth medium. Maxinum 90% of Co and 70% of Cu were dissolved from the leaching test at the 10 g/L pulp density, 4 % of molasses concentration in the growth medium after 21 days by Aspergillus niger KCTC 6985. But in case of using Aspergillus niger KCTC 6144, the maxium leaching percentage of Co and Cu was reached 90% respectively at a pulp density 5 g/L and 4% of molasses concentration.
Effect of Compatibilizers on the Mechanical Properties of Waste Polypropylene/Waste Ground Rubber Tire Composites
Park, Ki-Hun ; Kim, Dong-Hak ; Jung, Jong-Ki ; Kim, Seong-Gil ; Bang, Daesuk ; Oh, Myung-Hoon ; Kim, Bong-Suk ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 70~79
DOI : 10.7844/kirr.2014.23.1.70
In this study, waste polypropylene and waste ground rubber tire(WGRT) composites were prepared by using a modular intermeshing co-rotating twin screw extruder. The effect of three main factors such as WGRT contents, particle size, compatibilizers on the properties of waste PP/WGRT composites was extensively investigated. Tensile strength of the composites was decreased with an increase in WGRT contents, whereas elongation at break and impact strength were increased. The tensile strength, elongation at break and impact strength of the composites with the smaller size of the WGRT were more enhanced. Addition of PP-g-MA into waste PP/WGRT composites exhibited better tensile strength. However, elongation at break and impact strength were slightly decreased with increasing of PP-g-MA. On the other hand, tensile strength, impact strength and elongation at break of the composites were increased by adding the EPDM-g-MA and SEBS-g-MA. Especially, elongation at break was significantly increased compared to the composite with PP-g-MA.
Unit Process Analysis for EAF Dust Plant Operation
Moon, Seok-Min ; Kim, Tai-Dong ;
Journal of the Korean Institute of Resources Recycling, volume 23, issue 1, 2014, Pages 80~85
DOI : 10.7844/kirr.2014.23.1.80
Commercially operating EAF dust recycling processes were investigated by means of unit process analysis. Over 80 % of EAF recycling processes are Waelz kiln process adapted a rotary kiln as a main reactor. There are differences among these pyrometallurgical processes by plant location and timely important things such as environmental regulations. In this paper, the characteristics of each plants are analysed with the point of unit process.