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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 25, Issue 3 - Jun 2016
Volume 25, Issue 2 - Apr 2016
Volume 25, Issue 1 - Feb 2016
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Solvent Extraction of Zr(IV) and Hf(IV) from Sulfuric Acid Solutions by Acidic Extractants and Their Mixtures with TBP
Wang, Ling Yun ; Lee, Man Seung ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 3~9
DOI : 10.7844/kirr.2016.25.2.3
Separation of Zr(IV) and Hf(IV) from sulfuric acid solutions was investigated by extraction with several acidic extractants such as Versatic acid, LIX 63, and Cyanex 301. From strong sulfuric acid solutions, the separation of Zr(IV) and Hf(IV) by Versatic acid and LIX 63 was not possible, while selective extraction of Hf(IV) over Zr(IV) was obtained with Cyanex 301. However, the extraction percentage of the two metals was much lower compared to that by D2EHPA. Mixing of TBP with Cyanex 301 and D2EHPA led to negative effect on the extraction and separation of the two metal ions. The difference in the extraction reaction and separation selectivity between HCl,
media with each extractant was discussed.
Effect of Oxygen Injection on Microstructure and Mechanical Properties of Ni-based Superalloy Recycled by AOD Process
Lee, Duk-Hee ; Woo, Kee-Do ; Kang, Whang-Jin ; Yoon, Jin-Ho ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 10~16
DOI : 10.7844/kirr.2016.25.2.10
In this study, the Ni base superalloy was recycled by Argon oxygen decarburization(AOD) process using an inconel 713C scrap. During AOD process, argon gas was continuously injected 1,000 sccm and oxygen gas was injected into 10, 20 and 30 minutes of 100, 250 and 500 sccm.. In early stage of oxygen injection, the oxygen dose increased with increasing Al, Cr, and Mo content and decreasing C content. And Al content was decreased by carburization with added elements in late stage Because of oxidation was occurred with Al, Cr etc. after the reaction of carbon has been finished. From the results, the ratio of
phase reduced due to decreasing of Al content for that reason Al is the main element to form the
phase. Also carbide reduced owing to decreasing of C content so the mechanical properties of the specimens excessively injected by excess
gas were decreased.
Environmental Impact Assessment on Dismantling·Crushing·Sorting Process for Recycling of Used Small Household Appliances
Park, Eun Kyu ; Park, Ki Hak ; Choi, Woo Zin ; Kim, Soo Kyung ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 17~24
DOI : 10.7844/kirr.2016.25.2.17
This study aims at evaluating environmental impacts on recycling process of used small household appliances. The recycling process mainly consists of manual dismantling, crushing and various sorting processes to effectively recover valuable resources and to minimize environmental impact. In this study, life-cycle assessment (LCA) methodology is applied to analyze major environmental parameters such as GWP, ADP, POCP, EP, etc. One of the major impact categories on the weight basis in the recycling process is global warming (GWP) 57.1%, next to ADP 35.4% and POCP 4.8%, respectively. As a result of environmental impact on recovery of valuable resources/ton, the GWP of plastics for ABS is highest (33.7%) compared to ferrous metals (9.4%). The effects of environmental and economical benefit are also analyzed to compare with the amount of virgin materials to be recycled by recycled materials. In addition, recycled materials are also more economical in comparison to virgin materials due to the environmental avoiding effect by recycling. In conclusion, the key environmental issues related to the recycling of e-wastes are analyzed and therefore, the effective recycling process will contribute to mitigate global warming potential in the near future.
Electrowinning of Tin from Acidic Sulfate Effluents Using a Cyclone Electrolytic Cell
Kang, Myeong-Sik ; Cho, Yeon-Chul ; Ahn, Jae-Woo ; Shin, Gi-Wung ; Kang, Yong-Ho ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 25~32
DOI : 10.7844/kirr.2016.25.2.25
A electrodeposion behavior of tin was tested to recovery of tin metal from sulfate solution using a newly designed cyclone type electrolyzer. Parameters, such as flow rate, current density, tin and sulfuric acid concentration in the electrolyte were investigated. From the experimental results, a powered tin metal below
can be obtained. As the increase of flow rate, current density and sulfuric acid concentration in the electrolyte, electrodeposition ratio of tin and current efficiency were increased. The electrodeposition ratio of tin was increased with the decrease of tin concentration in the electrolyte, but the current efficiency was decreased.
Recovery of Cobalt from Synthetic Leaching Solution of Manganese Nodule Matte by Solvent Extraction-electrowinning
Kim, Hyun-Ho ; Nam, Chul-Woo ; Park, Kyung-Ho ; Yoon, Ho-Sung ; Kim, Min-Seuk ; Kim, Chul-Joo ; Park, Sang-Woon ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 33~41
DOI : 10.7844/kirr.2016.25.2.33
A scale up tests (380 kg/day) using a continuous solvent extraction and electro-winning system was carried out to separate and recover cobalt from a solution containing 1.91 g/L Co and 14.65 g/L Ni. The solution was obtained during a process including solvent extraction and precipitation stages for removal of Cu and Fe from a synthetic sulfuric acid solution of manganese nodule matte. The optimal condition for solvent extraction was : solvent concentration of 0.22M Na-Cyanex 272 (45% saponified with NaOH) and O:A phase ratios of 1:1.5, 10:1 and 1.5:1 used in extraction, scrubbing and stripping stages, respectively. The extraction and stripping efficiencies were found to be 99.8% and 99.88%, respectively. The stripped solution contained 40.27 g/L Co with 4 ppm Ni. Cobalt metal of 99.963% purity was yielded with current efficiency of 67% and current density of
during the electro-winning process.
Analysis for Valuable Materials Disassembled from 40- and 42-inched Waste LCDs (Liquid Crystal Displays)
Park, Hun-Su ; Kim, Yong ; Hong, Hyun Seon ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 42~48
DOI : 10.7844/kirr.2016.25.2.42
Although the generation of waste flat panel displays in Korea is expected to exceed one million sets in 2016, a comprehensive recycling technology has not yet been developed for effective recovery of valuable materials from the wastes, rendering to outshine the national prestige as a global leader in display industries. The overall aim of this study was to analyze the statistical data of various valuable materials and their ratio after dismantling 40-inch and 42-inch sized waste LCDs. The analysis results showed that plastic portion of the wastes was about 22% and the portion of PCB (Print Circuit Board) part was about 9% by weight whereas panel part was about 34% and leftovers including metals totalled about 35% by weight. Based on the analytical results, a higher value recycling process could be proposed with advanced material separation techniques.
Development of Concrete and Evaluation of Properties of Combined Steel making Slag Aggregates for Offshore Structure Production (I)
Jung, Won-Kyong ; Hwang, Yun-Seok ; Park, Dong-Cheon ; Cho, Bong-Suk ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 49~59
DOI : 10.7844/kirr.2016.25.2.49
Steel slag is being recycled into industrial by-products for civil generated inevitably in the seasonal course, road and cement raw materials. However, the field of recycling most of the bottom portion is concentrated in the areas that are required to take advantage of the situation in various fields taking advantage of the steel slag. But various studies to take advantage of the steel slag as aggregate for concrete made for limiting slag was a situation that most of the studies are incomplete research on the suitability of as aggregate for concrete practical relates to an expandable suppressed. In this study, the separation of the slag aggregate according to the production methods to assess the feasibility aggregate for concrete aggregates, including through Steel making slag, a total of seven kinds of steel slag aggregate. Studies show that ordinary concrete, steel slag aggregate for aggregate and on the equally to take advantage of grading, chloride content standards such as to what is lacking, although appropriate aggregate of concrete include the deployment of only in special sectors through the combination was assessed to have a very high.
Development of Concrete and Evaluation of Properties of Combined Steel making Slag Aggregates for Offshore Structure Production(II)
Jung, Won-Kyong ; Kim, Hyun-Seok ; Park, Dong-Cheon ; Cho, Bong-Suk ;
Journal of the Korean Institute of Resources Recycling, volume 25, issue 2, 2016, Pages 60~68
DOI : 10.7844/kirr.2016.25.2.60
In this study, earlier analyzed tetrapod, one of an original group of offshore constructions studied for manufacturability of the concrete using the properties of steel making slag aggregate. steel making slag aggregate assessment, RCS and Blast Furnace Slag : the 20 mm air-cooled slag and combinations by 50 %, aggregate properties on the most appropriate for the properties of recycled aggregate concrete optimal mix, and assessing it. Properties of concrete used to be derived are judged as to bury the studies show that the hollowing-out of the RCS, plastic sole use is in the workability of the aggregate, plastic in the 20 mm slag also assessed to be a slight disadvantage, but RCS by mixing air-cooled coarse and 50 percent to 20 percent 50 mm. Thus, steel making slag marine structures using recycled aggregate, in rapid chilled slag or air-cooled slag. The sole use of the aggregate them than to combine the aggregate of concrete. After they satisfy the quality standard quality shall be used will aggregate steel making slag who meet the criteria concrete manufacturing in general or par with the aggregate of concrete. Performance was assessed as to develop a more than that.