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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 19, Issue 6 - Dec 2010
Volume 19, Issue 5 - Oct 2010
Volume 19, Issue 4 - Aug 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
Urban Mine Resources and Metals Recycling Industries in Japan
Oh, Jae-Hyun ; Kim, Joon-Soo ; Moon, Suk-Min ; Min, Ji-Won ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 11~26
In order to review the recycling status of urban mine resources in Japan, metal consumption, metal recycling rate and metal recycling industry such as iron scrap, end of life vehiclcs(ELV), waste home appliances and spent IT equipments were surveyed. Japan took rank of top class in the world on the metal consumption and urban mine stock reserve. Metal recycling industries in Japan have been developed through excellent technologies for mineral processing and non-ferrous smelting. On the other hand, the technologies for recycling of rare metals are being developed now. Recycling rate of EL V, waste home appliances and personal computer are higher than the guidelines of the legislative standard.
Extractive Metallurgy and Separation Technology of Rare Earth Ores
Lee, Man-Seung ; Jeon, Ho-Seok ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 27~35
Rare earth alloys and compounds are the raw materials for the manufacture of advanced materials. Although domestic monazite ores have been found, there are some difficulties in recovering rare earth from these ores. Rare earth ores are found in few countries and these countries put an embargo on the export of rare earth ores for the protection of their industry. We gathered some information on the hydrometallurgical and pyrometallurgical processes to recover rare earths from bastnasite, monazite, and xenotime which consist of 95% of the total rare earth ores. Since rare earth with the purity more than 6N is needed for use in advanced materials, some separation methods such as fractional crystallization, precipitation, ion exchange, and solvent extraction were introduced.
Durability and Strength of Dense Grate Permeable Concrete Using Silica sand and Flexible Alkyd Resin
Kim, In-Jung ; Hong, Chang-Woo ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 36~42
Researches on resources recycling in the field of construction have made an extensive progress such as recycled aggregate of waste concrete and recycling of asphalt. On the other hand, there are almost never researches on pavement method with used waste frying oil. In South Korea, 0.2 million ton used waste frying oil is discharged every year. It is guessed that about 0.1 million ton used waste frying oil can be collected. If used waste frying oil is recycled, it is expected that disuse cost will be reduced and water pollution of rivers will be prevented. Therefore, the purpose of the study was to evaluate on mechanical features (strength, water resistance, chemical resistance, abrasion resistance, freezing and thawing resistance and permeable coefficient) whether dense graded permeable concrete mixing silica sand with flexible alkyd resin manufactured by making ester reaction with collected used waste frying oil to make alkyd resin could be applied to road pavement for non-roadway. The results of the study were as follows. In flexural strength, it had 1.6 times as much as road design standard 4.5MPa. In water resistance, chemistry resistance and freezing and thawing resistance, they had lack of strength in early age. As age went by, they didn't have large changes. And curing temperature had phenomenon of increase in strength at rather low temperature than high temperature by glass transition temperature of resin. Therefore, considering workability, strength and durability when it was applied to road pavement, it was reasonable that the mixing ratio of flexible alkyd resin was 10~15% in comparison with silica sand weight.
A Study on Drying Kinetics of Low Rank Coal(Indonesia-IBC) through the Fixed-Bed Reactor Experiments
Kang, Tae-Jin ; Jeon, Do-Man ; Jeon, Young-Sin ; Kang, Suk-Hwan ; Lee, Si-Hyun ; Kim, Sang-Do ; Kim, Hyung-Taek ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 43~50
The crisis of energy gives rise to the growing concerns over continuing uncertainty in the energy market. Under these circumstances, there are also increasing interests on coals. In particular, Low Rank Coal (LRC) is receiving gradual attentions from green industry. But due to is high moisture content range from 30 - 60%, drying process has to be preceded before being utilized as power plant. In this study drying kinetics of LRC is induced by using a fixed-bed reactor. The drying kinetics was evaluated in from of the particle size, the inlet gas temperature, the drying time, the gas velocity, and the LID ratio. The consideration of the reynold's number was taken for correction of gas velocity, particle size and LID was taken for correction of reactor diameter, packing height of coal. As being seen as characteristic of drying coal, it can be found that fixed-bed reactor can contributed to active drying of free water. In this sense, it could be considered that phase boundary reaction is appropriate mechanism.
A Study on the Cobalt and Lithium Recovery from the Production Scraps of Lithium Secondary Battery by High Efficient and Eco-friendly Method
Lee, Jeong-Joo ; Chung, Jin-Do ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 51~60
A study on the recovery of cobalt and lithium from Lithium Ion Battery(LIB) scraps has been carried out by a physical treatment - leaching - solvent extraction process. The cathode scraps of LIB in production were used as a material of this experiment. The best condition for recovering cobalt from the anode scraps was acquired in each process. The cathode scraps are dissolved in 2M sulfuric acid solution with hydrogen peroxide at
, 700 rpm. The cobalt is concentrated from the leaching solution by means of a solvent extraction circuit with bis(2-ethylhexyl) phosphoric acid(D2EHPA) and PC88A in kerosene, and then cobalt and lithium are recovered as cobalt hydroxide and lithium carbonate by precipitation technology. The purity of cobalt oxide powder was over 99.98% and the average particle size after milling was about 10 lim. The over all recoveries are over 95% for cobalt and lithium. The pilot test of mechanical separation was carried out for the recovery of cobalt from the scraps. The
powder was made by the heat treatment of
and the average particle size was about 10
after grinding. The recovery was over 99% for cobalt and lithium each other and the purity of cobalt oxide was over 99.98%.
Study on Recovery of Au from Flotation Tailing of Gold
Shin, Seung-Han ; Kang, Hyun-Ho ; Hong, Jong-Won ; Lee, Jin-Soo ; Park, Je-Hyun ; Han, Oh-Hyung ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 61~69
S.M.C (DSME), only operating gold mine in Korea, is processing about 160 ton/day to recover gold and more than 150 ton/day of tailing is produced. Some portion of the tailings are used as a filler material after drying, but most of them are stored on the tailing dam. As a result of chemical analysis by a fire assay method, it contained Au 1.5~2.0 g/ton and 225~300 g per day of gold is getting discarded. It is urgent to develop a technology to recover and reutilize Au. In the present study, flotation tests were carried out to recovery gold for the tailings. Test results show that products with gold grade 21.31 g/ton(Au grade) and 62.73% (Au recovery) were obtained under the optimal conditions including KAX addition rate 97.2 g/ton, frother AF 65 (0.248 l/ton) and depressant sodium silicate (4 kg/ton), it's possible to recover one of the most valuable metal Au, by re-feeding to rougher flotation.
NaOH Decomposition and Hydrochloric Acid Leaching of Monazite by Hot Digestion Method
Kim, Sung-Don ; Lee, Jin-Young ; Kim, Chul-Joo ; Yoon, Ho-Sung ; Kim, Joon-Soo ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 70~76
It was to investigate the optimum leaching conditions for the NaOH hot digestion and hydrochloric acid leaching of Monazite. The optimum condition for NaOH hot digestion was that the concentration of NaOH/TREO mole ratio was 15, the temperature of decomposition
, and reaction time 2 hrs. And the optimum condition for the hydrochloric acid leaching of NaOH hot digestion product was that the concentration of hydrochloric acid was 6N, leaching time 2 hrs and pulp density about 15%. The yield of rare earth oxide was above 90% on the above experimental condition.
Recovery of Valuable Materials from Gold Mine Tailings
Oh, Won ; Cho, Hee-Chan ; Lee, Jin-Soo ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 77~85
This study was carried out to develop a process flow sheet for recovering valuables (gold and high purity silica) from the gold mine tailings containing 1.7 g/ton of gold and 79.48 wt.%
. Float-sink tests using heavy liquids was conducted to explore the possibility of recovering gold by gravity separation. Hydrocyclone, froth flotation, and triboelectrostatic separatoin tests were conducted to recover high purity silica from the gold mine tailings. The results of float-sink tests showed that particles containing 5.58 g/ton of gold could be obtained at 2.72 specific gravity, but with very low yields around 3%. Meanwhile, all tests with hydrocyclone, froth flotation, and triboelectrostatic separation showed that high purity silica with
content over 90% could be obtained. The purity could be improved further up to about 94% by employing several recleaning steps in the froth flotation and triboelectrostatic process.
The physical properties evaluation and analysis about color revelation of the black-color mortar which applies the Granulated Blast Furnace Slag
Kim, Seol-Hwa ; Jang, Hong-Seok ; So, Seung-Young ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 86~92
In the many kind of construct-material, the concrete which has the high-strength and a durability is sufficient to use with structure-material. but the color of concrete is very monotony, so generally concrete isn't used the out surface. although color concrete is a method of expressing surface, the combination of pigment and cement cause many physical problem such as efflorescence phenomenon, strength degradation and so on. In this study, It attempt to develop the black mortar using the industrial granulated blast furnace slag and to evaluate basic physical properties compare with general color concrete to solve the color concrete problem. The result of experiment showed that the flow dropped mixing of pigment. but flow increased in proportion to the mixing rate in occasion of mortar that mix granulated blast furnace sla and black mortar which was made granulated blast furnace slag has more visible black color than any mortar.
Hydration Property of Electric Arc Furnace Reduction Slag
An, Yong-Jun ; Han, In-Kyu ; Choi, Jae-Seok ; Bae, Kwang-Hyun ; Kim, Hyung-Seok ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 6, 2010, Pages 93~101
In this study, we have studied hydration properties and compressive strength of the electric arc furnace reduction slag as a cement admixture. The reduction slag is mainly consisted of 17.1% of f-CaO and rapid curing clinker minerals, 37.1% of
, and 21.0% of
. When the substitution rate of the slag on OPC was 30%, the initial setting time and final setting time has been shortened from 305 min. and 425 min. to 10min. and 30min. When the substitution rate of the slag on OPC was 7%, the compressive strength of mixed cement mortars has been increased than that of OPC during all period. When the substitution rate of the slag on OPC was over 20%, the compressive strength of mortars has been reduced than that of OPC at initial and final compressive strength. As a result of hydration properties of reduction slag,
but as the substitution rate of slag on OPC increases, increased f-CaO and the metastable hydrates
increased. Therefore, we should control the substitution rate of the slag on OPC was under 7% in order to use EAF reduction slag as a cement admixture.