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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 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
The Main Contents of the Countermeasures for Recycling of Used Metal Resources
Kim, Soo-Kyung ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 3~12
Countries which have a lot of metal resources are weaponizing metal resources such as supply limitation, high price sale. It's necessary for us to establish the countermeasure for recycling of used metal resources on a government basis. Ministry of Environment has established and announced the project for finding and reuse the hidden metal resources as pan-government department pass the Cabinet meeting at September 22, 2009. This countermeasure, 10 years project, is classified into 2 steps. Aim of this project is advance of the recycling technology and industry, achievement of recycling rate, 75%, improvement in adverse balance of trade, 1.25 billion US$.
Present Condition on the Recycling and Management for Waste Alkali
Sim, Yeon-Ju ; Kim, Eui-Yong ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 13~18
Effort of reducing wastes and their recycling is increasing in worldwide. Especially, extreme care for alkali recycling is required because of its environmental pollution and its corrosive characteristics. In order to manage alkali wastes effectively, it is necessary to make quality standards for recycling products from the alkali wastes because there are no quality specifications yet. In this study, we selected several recycling candidates from the alkali wastes based on the analysis of the most recent data of the various industrial sites. As a result, the recycling candidates from the alkali wastes are sodium hydroxide, aluminum sulfate, poly aluminum chloride. It is believed that the proper management system for waste products is required in governmental point of view and it propagates positively for resolving various environmental issues.
Effect of the Combined Using of Fly Ash and Blast Furnace Slag as Cementitious Materials on Properties of Alkali-Activated Mortar
Koh, Kyung-Taek ; Kang, Su-Tae ; Park, Jung-Jun ; Ryu, Gum-Sung ; Lee, Jang-Hwa ; Kang, Hyun-Jin ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 19~28
Attempts to increase the utilization of a by-products such as fly ash and blast furnace slag to partially replace the cement in concrete are gathering momentum. But most of by-products is currently dumped in landfills, thus creating a threat to the environment. Many researches on alkali-activated concrete that does not need the presence of cement as a binder have been carried out recently. However, most study deal only with alkali-activated blast furnace slag or fly ash, as for the combined use of the both, little information is reported. In this study, we investigated the influence of mixture ratio of fly ash/slag, type of alkaline activator and curing condition on the workability and compressive strength of mortar in oder to develop cementless alkali-activated concrete. In view of the results, we found out that the mixture ratio of fly ash/slag and the type of alkaline activator always results to be significant factors. But the influence of curing temperature in the strength development of mortar is lower than the contribution due to other factors. At the age of 28days, the mixture 50% fly ash and 50% slag activated with 1:1 the mass ratio of 9M NaOH and sodium silicate, develop compressive strength of about 65 MPa under
Ionic Equilibria and Comparison of Solvent Extraction of Cobalt(II) and Manganese(II) from HCl Solution by Alamine336
Lee, Man-Seung ; Shin, Shun-Myung ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 29~34
Distribution diagram of
was obtained by analyzing ionic equilibria of the two metals in HCl solution. In the HCl concentration range of 4 and 10 M, most of cobalt exists as
, whereas Mn exists
. Extraction isotherm of Co(II) and Mn(II) was calculated by using the equilibrium constant for the solvent extraction of the two metals by Alamine336. Although the equilibrium constant for the solvent extraction of Mn was higher than that of Co, extraction isotherm indicated that cobalt could be extracted more efficiently than manganese at the same initial extraction conditions.
Increase of strength and freezing-thawing resistance of porous concrete by Silica-fume
Hong, Chang-Woo ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 35~40
Existing porous concrete has problems with reduction of strength due to freezing and thawing and exfoliation of aggregate at joints. In this study, a method for increasing strength and durability of porous concrete by using fine aggregate, silica-fume and high-range water-reducing agent was proposed by laboratory tests. Mixing ratio between silica-fume (10%) and fine aggregate (0%, 7%, 15%) was selected as a major test factor, and laboratory tests for compressive strength, flexural strength, permeability coefficient, porosity, freezing and thawing were conducted. Compressive strength and flexural strength were increased as the mixing ratio of fine aggregate was increased. However, permeability and freezing-thawing resistance were decreased due to reduction of porosity. Therefore, the ratio of fine aggregate should be limited to increase strength and durability of the porous concrete, while the mixing ratio of silica-fume should be over 10%.
Recovery of Tungsten from WC-Co Hardmetal Sludge by Aqua regia Treatment
Kim, Ji-Hye ; Kim, Eun-Young ; Kim, Won-Back ; Kim, Byung-Su ; Lee, Jae-Chun ; Shin, Jae-Soo ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 41~50
A fundamental study was carried out to develop a process for recycling tungsten and cobalt from WC-Co hardmetal sludge generated in the manufacturing process of hardmetal tools. The complete extraction of cobalt and simultaneous formation of tungstic was achieved by treating the sludge using aqua regia. The effect of aqua regia concentration, reaction temperature and time, pulp density on cobalt leaching and tungstic acid formation was investigated. The complete leaching of cobalt was attained at the optimum conditions: 100 vol.% aqua regia concentration,
temperature, 60 min. reaction time and 400 g/L pulp density. A complete conversion of tungsten carbide of the sludge to tungstic acid was however, obtained at the pulp densities lower than 150 g/L under the above condition. The progress of reaction during the aqua regia treatment of the sludge was monitored through the XRD phase identification of the residue. The metallic impurities in the tungstic acid so produced could be further removed as insoluble residues by dissolving the tungsten values in ammonia solution. The ammonium paratungstate(
) of 99.85% purity was prepared from the ammonium polytungstate solution by the evaporation crystallization method.
Synthesis of Si-SiC-CuO-C Composite from Silicon Sludge as an Anode of Lithium Battery
Jeong, Goo-Jin ; Jang, Hee-Dong ; Lee, Churl-Kyoung ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 51~57
As a recycling of Si sludge from Si wafer process, a Si-SiC-CuO-C composite material was synthesized and investigated as an anode material for lithium batteries. The Si sludge consisted of Si, SiC, machine oil, and metallic impurities. The oil and metal impurities was removed by organic washing, magnetic separation, and acid washing. The Si-SiC-CuO-C composite from the recovered Si-SiC mixture was prepared by high-energy mechanical milling. According to the electrochemical tests such as charge-discharge capacity and cycling behavior, it showed the improved cycle performance. The SiC and CuO-related phases were presumed to restrain the volume expansion of the anode and Fe, however, should be removed below 10 ppm prior to synthesis of the composite because it caused the capacity loss of the active material itself.
Flotation Characteristics of Malachite by Various Collectors
Kim, Hyung-Seok ; Kim, Wan-Tae ; Han, In-Kyu ; Kim, Sang-Bae ;
Journal of the Korean Institute of Resources Recycling, volume 19, issue 4, 2010, Pages 58~64
In order to select the proper collector for the flotation of malachite, we had floated malachite by using various collectors. When measuring the zeta potential of malachite, we knew that the point of zero charge of malachite is found at pH 8.2 and malachite particles are negatively charged above this pH value; and positively, below this pH value. The floatability of malachite by the anionic collectors like sodium oleate and Aeropromoter 845, was about 97% in pH 5~11 range, whereas that of malachite by alkyl hydroxamate and the cationic collector like dodecyl trimethyl ammonium chloride and dodecyl ethyl methyl ammonium chloride, was below 15% above pH 5 regardless of dosage increase of collector and flotation time. The malachite sulphidised by
was floated above 97% by potassium amyl xanthate. The dosage of potassium amyl xanthate decreased and the flotation period shortened to one third than when it was not sulphidised by
. Therefore, potassium amyl xanthate and the anionic collectors like sodium oleate and Aeropromoter 845 can be used as the collector of malachite.