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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 15, Issue 6 - Dec 2006
Volume 15, Issue 5 - Oct 2006
Volume 15, Issue 4 - Aug 2006
Volume 15, Issue 3 - Jun 2006
Volume 15, Issue 2 - Apr 2006
Volume 15, Issue 1 - Feb 2006
Selecting the target year
An Effect of
on the Reaction between Molten Converter Slag and CaO pellet
Kim, Young-Hwan ; Ko, In-Yong ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 3~9
As a basic study on the conversion of molten converter slag to the ordinary portland cement, the effects of
addition on the interface reaction between solid CaO and molten converter slag has been studied. Alumina added converter slag whose basicity was controlled to 1 and 2 was melted and hold for 30 minutes in MgO crucible at
. Then sintered CaO pellet heated at the same temperature was dipped into the molten slag and held for 30minutes. After the reaction, the crucible was cooled in air and the specimen was cut off to the horizontal direction of the crucible. The dissolution rate of CaO pellet with the addition of
was measured by the change of the radius or sintered CaO pellet and the interface layer was observed by SEM/EDX. As a result. At the basicity 2 slag, thickness of created
layer increased 3.5 times and quantity of
phase increase 2 times than baisicy 1 slag.
Study of Fundamental Properties of Latex-Modified Concrete Using Blast-furnace Slag
Hong, Chang-Woo ; Jeong, Won-Kyong ; Kim, Kyeong-Jin ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 10~17
The purpose of this study was to evaluate the effects of blast-furnace slag on strength development and durability of latex-modified concrete (LMC) and ordinary portland cement concrete as slag contents. Main experimental variables were performed latex contents (0%, 10%, 15%) and slag contents (0%, 30%). The compressive and flexural strengths, chloride-ion rapid permeability and chemical attacks resistance were measured to analyze the characteristic of the developed LMC and BS-LMC(latex-modified concrete added blast-furnace slag) on hardened concrete. The test results showed that compressive and flexural strength of BS-LMC increased as the slag contents increased from 0% to 30% at the long term of curing. It considers blast furnace slag used when latex content was up to 10%. The permeability resistance of BS-LMC(latex 10%, blast 30%) was extremely good at the curing time 90 days. Also. the effects of added blast furnace slag on OPC and LMC were increased on the permeability and chemical attacks resistance.
The Phenomenon of the Slag Foaming and the Result of using Various Slag Deforming Agents in the Steelmaking Converter
Chun, Sang-Ho ; Song, Choong-Ok ; Ban, Bong-Chan ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 18~23
Foaming of slag is a thermodynamically unstable phenomenon and has significant effects in iron and steelmaking processes. For better recycling method of pulp sludge, the application as an defoaming agent during steelmaking process was adopted and tested. The forming machine has been modified in order to produce the briquettes, which are made of pulp sludge and slag with different weight ratio. Influencing factors on the foaming phenomena have been studied and tested for better understanding of foaming phenomena. Experiments were carried out with
based slags with Ar gas injection and addition of coke particles. The slag basicity and (%FeO) contents adapted as major factors to treasure foaming tendency of the slag system. It was found that foam index (
) gradually decreased as both the basicity and the (FeO) content increase. Four kinds of antifoaming agent such as aluminium dross, cokes, rice bran and pulp sludge with steelmaking slag have been tested in actual process. Aluminium dross was the most effective, and pulp sludge with steelmaking slag also showed the desired results.
Experimental Study for Utilizing of Recycling Fine Aggregate as Precast Concrete Aggregate
Moon, Dae-Joong ; Moon, Han-Young ; Kim, Yang-Bae ; Lim, Nam-Woong ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 24~31
The duality of recycled fine aggregate (RS) which was produced at the waste concrete crushing was investigated. The compressive strength, flexural strength and absorption of mortar utilized with RS were examined. It was evaluated on the application of RS as precast concrete aggregate. The density and absorption of RS were
and 8.07% respectively, the quality of RS was satisfied with the criterion of KS F 2573 type 2. The maximum 28days compressive strength of mortar mixed with blended cement MRS1, MRS2 and MRS3 were developed with 15.8, 27.4 and 48.7MPa respectively, in condition to curing temperature
and water-cement ratio 37.5%. When blended cement MRS1 and MRS2 were used, the maximum flexural strength of mortar was developed at curing temperature
and water-cement ratio 35.0%. When blended cement MRS3 was used, the maximum flexural strength of mortar was developed at curing temperature
and water-cement ratio 37.5%. The absorption of mortar mixed with blended cement MRS1, MRS2 and MRS3 were indicated the range of
respectively. Therefore, when the ratio of blended cement and RS is appropriately centre]led, it would be expected that MRS1, MRS2 and MRS3 will be able to apply the variable low strength, medium strength and high strength precaste concrete.
Comparison of Two-Types Compositions of Mixed Salts in Fused Salt Electrolysis of Magnesium
Park, Hyung-Kyu ; Park, Jin-Tae ; Choi, Young-Yoon ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 32~36
Magnesium has been used as light and functional material, and its demand is increasing as a material for automobile engine and for mobile phone or notebook PC case. Fused salt electrolysis and thermal reduction are regarded as main methods for the extraction of magnesium, and choice for the method is firstly according to raw material. In this study, magnesium metal is obtained by an electrolysis of magnesium chloride. Two types of fused salt mixtures were used as electrolyte and electrolyzed at 7V with a graphite anode having the same depth, and their results were compared with each other. A mixed salt of
was the more effective than
in current efficiency through the experiments at
. Purity of the prepared magnesium metal was above 98%. Some basic data for scale-up of the magnesium electrolysis equipment, which would be necessary for a commercialization, could be obtained.
A study on Flotation of Crystalline Graphite by Microbubble Column
Han, Oh-Hyung ; Kang, Hyun-Ho ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 37~44
The total amount of graphite reserves in Korea is about 260 thousand tons. Graphite larks international competitiveness it is mined in only few mines, but recently the demand of portable electronic has increased. Therefore a research for manufacturing domestic high purity graphite is necessary because all of high purity graphite used electrode of 2nd batter depends on expensive importation. A preprocessing level for producing high purity graphite, flotation was conducted using microbubble column machine. In this research
sample was used which was produced after grinding 29.50% F.C. primary crushing sample(
) for 20 minutes through attrition mill. As a result using this sample, product above 95% F.C. with recovery over 90% was obtained with only after first stage process through the microbubble column.
Sorption of copper ion on waste pig bone
Kim, Eun-Jung ; Woo, Sung-Hoon ; Park, Seung-Cho ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 45~49
The removal of copper ion from aqueous solution by adsorption with bone char that made from spent pig bone has been studied. This paper was studied the effects of bone char dosage and pH. The optimal results show that bone char adsorbs about 96.5 percent of copper ion in aqueous solution containing 50 mg/L as initial concentration at pH 5.0 when the bone char of 5g/L is used for 30 hours. Increase in the initial pH of the copper solution resulted in an increase in the copper ion uptake per weight of the sorbent Freundlich isotherm model was found to be applicable for the experimental data of
Production of Activated Carbon from Woody Fishing Port Wastes Using Sulfuric Acid as Activating Agent
Kim, Dong-Su ; Lee, Jung-Eun ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 50~57
Production of activated carbon from woody fish parking cases has been studied using waste sulfuric acid as an activating agent for the purpose or promoted recycling of woody fishing port wastes. The adsorption capacity of produced activated carbon was observed to increase with activation temperature and reached its maximum at ca.
under the experimental conditions. However, the adsorption capacity of activated carbon became deteriorated above this temperature due to the thermal degeneration of its structure. Optimal activation time was found to be about 120 minutes and 1:3 weight ratio of raw material and activating agent was appropriate for increased adsorption capacity of activated carbon under the conditions of
and 60 minutes of activation time. Regarding the effect of the concentration of activating agent on activation, ca. 1.2 M of sulfuric acid was observed to be proper for an optimal activation or raw material. Comparison of the activation power of sulfuric acid with nitric acid showed that sulfuric acid was superior to nitric acid, however, with regard to the yield of activated carbon there was no significant difference between the two activating agents. The degree of dispersion of carbon particles was shown to be relatively high in neutral condition and the produced activated carbon was considered to be effectively employed for the treatment of metal ions in wastewater due to its negative surface charge in aqueous condition.
Basic Study for the Recycling of Phosphogypsum
Park, Woon-Kyoung ; Song, Young-Jun ; Lee, Jung-Mi ; Lee, Gye-Seung ; Kim, Youn-Che ; Shin, Kang-Ho ; Yoon, Sin-Ae ; Park, Charn-Hoon ;
Journal of the Korean Institute of Resources Recycling, volume 15, issue 2, 2006, Pages 58~68
This study is carried out for the purpose of investigating the property of phosphogypsum, and suggesting the proper recycling system for it. The chemical composition, mineralogical composition, particle size distribution and shape of phosphogypsum were investigated. The size distribution and constitution of impurities, distribution of heavy metals are also investigated. In conclusion, the grade and yield of recoverable phosphogypsum were discussed.