Go to the main menu
Skip to content
Go to bottom
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
Study on Kinetics and Syngas Production of Sewage Sludge Gasification
Roh, Seon Ah ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 3~8
DOI : 10.7844/kirr.2015.24.6.3
Gasification characteristics and gas produced from a sewage sludge char were analyzed by using a thermobalance reactor, which is used for a reaction kinetic analysis by measuring weight change of materials at a desired temperature. Gasification reaction rate increased with increasing temperature and steam partial pressure due to the promotion of gasification reaction. Three models of gas-solid reaction were applied to the reaction kinetics analysis and modified volumetric reaction model was an appropriated model for the steam gasification of the sewage sludge char. Apparent activation energy and pre-exponential factors were evaluated as 155.5 kJ/mol and
, respectively. The order of reaction on steam partial pressure was 0.68. Gas analysis was performed at
and hydrogen concentration was highest in the gas concentrations, which increased with increasing the steam partial pressure. Hydrogen concentration increased the most and hydrogen concentration in the produced gas was 2-4 times higher than that of carbon monoxide due to the gasification and water gas shift reaction.
The Effect of NH
Concentration during Co-precipitation of Precursors from Leachate of Lithium-ion Battery Positive Electrode Active Materials
Park, Sanghyuk ; Ku, Heesuk ; Lee, Kyoung-Joon ; Song, Jun Ho ; Kim, Sookyung ; Sohn, Jeongsoo ; Kwon, Kyungjung ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 9~16
DOI : 10.7844/kirr.2015.24.6.9
In a recycling scheme of spent lithium ion batteries, a co-precipitation process for the re-synthesis of precursor is essential after the leaching of lithium ion battery scraps. In this study, the effect of ammonia as impurity during the co-precipitation process was investigated in order to re-synthesize a precursor of Ni-rich cathode active material
(NCM 622). As ammonia concentration increases from 1 M (the optimum condition for synthesis of the precursors based on 2 M of metal salt solution) to 4 M, the composition of obtained precursors deviates from the designed composition, most notably for Ni. The Ni co-precipitation efficiency gradually decreases from 100% to 87% when the concentration of ammonia solution increases from 1 M to 4 M. Meanwhile, the morphological properties of the obtained precursors such as sphericity, homogeneity and size distribution of particles were also investigated.
A Study on Desulfurization Efficiency of Limestone Sludge with Particle Size
Seo, Sung Kwan ; Chu, Yong Sik ; Shim, Kwang Bo ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 17~23
DOI : 10.7844/kirr.2015.24.6.17
Flue gas desulfurization(FGD) is the technique to remove
gas from stack gases of coal-fired plants. Many researcher have studied to replace the desulfurizing agent because FGD systems use a lot of limestone and energy. In this study, we use the limestone sludge which is a by-product of steel industry in order to replace desulfurizing agent of FGD system by control the particle size of limestone sludge. And desulfurization performance test is implemented by investigating
gas removal properties upon the characteristic of the limestone sludge with various particle size.
Sulfuric Acid Leaching of Manganese from Ferromanganese Dust
Park, Suji ; Sohn, Ho-Sang ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 24~30
DOI : 10.7844/kirr.2015.24.6.24
The sulfuric acid leaching of ferromanganese dust was studied. The effect of acid concentration, reaction temperature, stirring rate, particle size and solid to liquid ratio on Mn and Fe extraction in the solution were investigated. It was found that the leaching rate of Mn and Fe increased with increasing reaction temperature and sulfuric acid concentration. Examination of data by shrinking core model suggested that the leaching rate is controlled by chemical reaction at the surface of particle. The activation energy for the leaching reaction of Mn and Fe were calculated to be 79.55 kJ/mol and 77.48 kJ/mol, respectively.
Properties of Reformed Electric Arc Furnace Slag as Cement Admixtures
Kim, Kee-seok ; Bae, In-kook ; Seo, Joo-beom ; Choi, Jae-Seok ; Lee, Yoon-kyu ; Kim, Hyung-seok ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 31~37
DOI : 10.7844/kirr.2015.24.6.31
Ground granulated blast-furnace slag (GGBFS) which is by-product of steel industry has been recycled as a cement admixture though the other steel slags are used as aggregates. In this study, the electric arc furnace slag (EAFS) was used as a cement admixture after the reduction of iron oxide in the slag at the interface of molten slag and water quenching. Consequently, the reformed EAFS (REAFS) had higher grindability than that of granulated blast furnace slag. And in mortar tests, the strength properties of specimens using REAFS were 98% of plain specimens of GGBFS upto 20% replacement ratio of GGBFS with REAFS.
Influence of Physicochemical Characteristic of Donghae-Samcheok Limestones on the Performance of Flue Gas Desulfurization (FGD)
Seo, Jun-Hyung ; Baek, Chul-Seoung ; Kwon, Woo-Tech ; Cho, Kye-Hong ; Ahn, Ji-Whan ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 38~44
DOI : 10.7844/kirr.2015.24.6.38
It studies that effect of limestone of physicochemical characteristic on the performance of flue gas desulfurization (FGD) and application examination for technology of wet type FGD process and to utilize the limestone in Donghae-Samcheok. The experiment method was measured total neutralizing capability (TNC) using the lab scale experimental apparatus based on the HCl titration test. The results of TNC of limestone samples were more dependent on the physical characteristics including particle size rather than chemical compositions such as CaO content and particle size of limestone get smaller, TNC is increased.
A Study on Mechanical Properties for Recycling of PVC Scraps
Kye, Hyoungsan ; Lee, Yong Moo ; Han, Jaemyung ; Hong, Suk won ; Kim, Yungsoo ; Lee, Dong hyun ; Bae, Jong wook ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 45~53
DOI : 10.7844/kirr.2015.24.6.45
There are few studies on the effects of different sources of PVC scraps generated after the end-of-life PVC products and these scraps are used to prepare PVC products of low quality. In this paper, rigid PVC scraps from different sources such as clothes, pipes, and others were investigated to incorporate into virgin PVC compounds as a part of efforts to recycle various PVC scraps effectively. It was found that the tensile strength and impact strength of the PVC compounds generally decreased with increasing the content of PVC scraps. The impact properties of scrap were in order of CC > PC > RC, tensile strength were PC > CC > RC and Vicat softening temperature shows no specific tendency. CC scraps contents of 50 phr of virgin PVC resin showed 80 %, and PC scrap with 50 phr of virgin resin showed 50% of the mechanical properties with virgin PVC.
A Study on the Conditions of Drying Efficiency for Conveyor-Belt-Type Dryers Employing Continuous Decompression Indirect Heating Method
Ha, Sang-An ; Kim, Dong-Kyun ; Wang, Jei-Pil ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 54~60
DOI : 10.7844/kirr.2015.24.6.54
The objective of this study is to develop a belt-type dryer with a capacity of 1 ton/day, thereby improving drying efficiency by more than 70% and reducing the size of dryers by more than 50%, and thus making dryers smaller and lighter to reduce the installation and operation costs by more than 20%. We identified structural improvements by analyzing existing dryers employing indirect heating and verified the superior drying performance of the proposed method through some basic experiments. Furthermore, we verified the improvements in the heat transfer and drying characteristics as we conducted the experiments at reduced pressure.
Characteristics of Natural Hydraulic Lime Mortar Mixed with Basalt Fiber
Moon, Ki-Yeon ; Cho, Jin-Sang ; Cho, Kye-Hong ; Hong, Chang-Woo ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 61~68
DOI : 10.7844/kirr.2015.24.6.61
In this study, the strength properties of NHL based mortar with blending basalt fiber were investigated. In the first step, it was evaluated that physical properties of NHL based mortar according to mixing method of four types of basalt fiber and then mixing method of one type was selected. As a result of assessment, it showed that the physical properties with mixing method of dry blending were better than that of wet blending and mixing method that basalt fiber pre-mixed with NHL for 5 min in a blender was selected and water and aggregate were finally added. Secondly, the investigation of blending fiber length on the compressive and flexural strength for basalt fiber reinforced NHL based mortars was carried out. The compressive strength was decreased with adding fiber, and the flexural strength was increased more than plain mortar. In the case of adding 6 mm fiber, the compressive and flexural strength were improved more than that of others.
Column Bioleaching of Arsenic from Mine Tailings Using a Mixed Acidophilic Culture: A Technical Feasibility Assessment
Borja, Danilo ; Lee, Eunseong ; Silva, Rene A. ; Kim, Heejae ; Park, Jay Hyun ; Kim, Hyunjung ;
Journal of the Korean Institute of Resources Recycling, volume 24, issue 6, 2015, Pages 69~77
DOI : 10.7844/kirr.2015.24.6.69
Heap bioleaching for detoxification of mine tailings is a promising technology; however, long-term studies that aim to understand the potential of this process are scarce. Therefore, this study assesses the feasibility of column bioleaching as an alternative technology for treatment of mine tailings with high concentrations of arsenic during a long-term experiment (436 days). To accomplish this objective, we designed a 350-mm plastic column that was packed with 750 g of mine tailings and inoculated with an acidophilic bacterial culture composed of A. thiooxidans and A. ferrooxidans. Redox potential, pH, ferric ion generation, and arsenic concentration of the off-solution were continuously monitored to determine the efficiency of the technology. After 436 days, we obtained up to 70% arsenic removal. However, several drops in removal rates were observed during the process; this was attributed to the harmful effect of arsenic on the bacteria consortium. We expect that this article will serve as a technical note for further studies on heap bioleaching of mine tailings.