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페로니켈 슬래그로부터 Mg 이온의 용출특성과 화합물 제조
추용식,임유리,박홍범,송훈,이종규,이승호,Chu, Yong-Sik,Lim, Yoo-Ree,Park, Hong-Bum,Song, Hun,Lee, Jong-Kyu,Lee, Seung-Ho 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.6
Ferro-Nickel slag is one of the by-products in Ferro-Nickel manufacturing process. The slag is composed of $SiO_2$, MgO, $Fe_2O_3$ and others. But the slag has been buried at landfill despite having valuable elements. This study tried to extract Mg ion and fabricate Mg compound from ferro-nickel slag using hydrochloric acid solution. Mg ion was extracted with Si, Fe and other ions in HCl solution. So reprocess was needed for gaining high purity Mg ion. It was thought that Si ion or $SiO_2$ precipitated in HCl solution and removed from solution in filtering process. Fe ion converted into $Fe(OH)_3$ after reacted with $NH_4OH$ and precipitated in HCl solution. After these process, the filtrate was composed of high purity Mg ion. $MgCl_2{\cdot}NH_4Cl{\cdot}6H_2O$ was obtained through drying of filtrate and this product was changed into MgO by burning process ($600^{\circ}C$-30 min). That is, 1st material or solution for manufacturing 2nd product was fabricated using acid dissolution method and other treatments.
C12A7계 슬래그와 석유 코크스 연소재를 사용한 수축저감재 및 모르타르의 특성
추용식,박수현,서성관,박재완 한국세라믹학회 2013 한국세라믹학회지 Vol.50 No.5
In this study, petroleum cokes ash and C12A7-based slag were used for the shrinkage reduction and strength enhancement of mortar. The hydration properties of shrinkage reduction agents were analysed. The flow, change of length and compressive strength were experimented with mortar-added shrinkage reduction agents. As a result of this study, petroleum cokes ash : C12A7-based slag =60 ~ 80% : 20 ~ 40% showed excellent results. In the case of mortar with 20% C12A7-based slag, the setting time and change of length were similar to Ref. mortar. The flow and compressive strength were superior to Ref. mortar. In the case of mortar with a 40% C12A7-based slag, the setting time was longer than Ref. mortar. The compressive strength of 3 days and 7 days were superior to Ref. mortar.
광학현미경을 이용한 소성 조건별 시멘트 클링커 광물의 특성 변화
추용식,김인섭,이종규,Chu, Yong-Sik,Kim, In-Seob,Lee, Jong-Kyu 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.11
광학 현미경을 사용한 시멘트 클링커의 특성 분석은 시멘트의 품질뿐만 아니라 제조공정도 예측 평가할 수 있다. 그러므로 본 연구에서는 광학 현미경(반사)으로 소성 조건을 달리한 클링커의 특성을 분석하였다. 승온 및 냉각 속도가 느려짐에 따라 alite와 belite는 성장하였으며, 특히 냉각 속도는 belite의 성장에 큰 영향을 주었다. 또한 최대 소성 온도에서의 유지 시간이 20분 증가함에 따라 alite와 belite가 약 5fm정도 성장하는 것을 확인하였으며, 최대 소성 온도가 140$0^{\circ}C$인 경우, belite의 크기는 양호하나 alite는 제대로 성장하지 않은 10~15$\mu\textrm{m}$수준이었다. The characteristic analysis of cement clinker using light microscope can evaluate not only the quality of cement but also making process. Thus this study analyzed clinkers having different burning conditions by reflective light microscope. As heating and cooling rates is decreased, alite and belite minerals grew and especially cooling rate had an effect on the growth of belite. Futhermore as the retention time in max. temperature got longer by twenty minutes, alite and belite minerals grew more about 5 $\mu\textrm{m}$. In the case of temperature 1400$^{\circ}C$ in max, the size of belite was suitable but alite was not suitable with the size of 10~15 $\mu\textrm{m}$.
Hygroscopic Characteristic of Hydrothermal Reacted Panels Using Porous Materials
추용식,권춘우,송훈,이종규 한국세라믹학회 2008 한국세라믹학회지 Vol.45 No.12
Diatomite, bentonite and zeolite were used as porous materials for fabricating hygroscopic panels. Moisture adsorption and desorption of porous materials were investigated and hydrothermal method was applied to fabricate panels. Cheolwon diatomite and Pohang zeolite showed excellent characteristics of moisture adsorption and desorption. These characteristics were caused by higher surface area and pore volume of porous materials. Correlation coefficient between surface area and moisture adsorption content of porous materials was 0.93. Moisture adsorption contents were influenced by surface area and pore volume of panels, and surface area more effected on moisture adsorption. Correlation coefficient between surface area and moisture adsorption content of panels was 0.86. Moisture adsorption content of panel with 10% Pohang zeolite was 180 g/m 2 and that of 10% Cheolwon diatomite was 170 g/m 2 . Moisture desorption content of panel with 10% Pohang zeolite was 105 g/m 2 . Moisture adsorption contents of panel with porous materials were higher than that of panel without porous materials. Diatomite, bentonite and zeolite were used as porous materials for fabricating hygroscopic panels. Moisture adsorption and desorption of porous materials were investigated and hydrothermal method was applied to fabricate panels. Cheolwon diatomite and Pohang zeolite showed excellent characteristics of moisture adsorption and desorption. These characteristics were caused by higher surface area and pore volume of porous materials. Correlation coefficient between surface area and moisture adsorption content of porous materials was 0.93. Moisture adsorption contents were influenced by surface area and pore volume of panels, and surface area more effected on moisture adsorption. Correlation coefficient between surface area and moisture adsorption content of panels was 0.86. Moisture adsorption content of panel with 10% Pohang zeolite was 180 g/m 2 and that of 10% Cheolwon diatomite was 170 g/m 2 . Moisture desorption content of panel with 10% Pohang zeolite was 105 g/m 2 . Moisture adsorption contents of panel with porous materials were higher than that of panel without porous materials.
추용식,김정환 한국세라믹학회 1994 한국세라믹학회지 Vol.31 No.12
DSP technique was applied to improve the high strength characteristics of hardened cement paste using pozzolan materials as blending materials, and pozzolan reactivity was investigated. Pozzolanic materials such as diatomaceous earth, fly ash and hydrated silica were used as blending material. And also superplasticizer was added to cement for molding the specimens. After curing for 60 days, the specimens substituted with 10 and 15 wt% of diatomaceous earth showed better strength characteristics than the specimen with fly ash. The specimen substituted 7 wt.% of hydrated silica exhibited excellent strength with above 800 kg/$\textrm{cm}^2$.
유리연마슬러지를 사용한 다공성 소재의 미세구조 및 물리적 특성에 관한 연구
추용식,권춘우,이종규,심광보,Chu, Yong-Sik,Kwon, Choon-Woo,Lee, Jong-Kyu,Shim, Kwang-Bo 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.5
A porous material with a surface layer was fabricated from glass abrasive sludge and expanding agents. The glass abrasive sludges were mixed with expanding agents and compacted into precursors. These precursors were sintered in the range of $700-900^{\circ}C$ for 20 min. The sintered porous materials had a surface layer with smaller pores and inner parts with larger pores. The surface layer and closed pores controlled water absorption. As the expanding agent fraction and the sintering temperature increased, the porosity and pore size increased. The porous materials with $Fe_2O_3$ and graphite as the expanding agents had a low absorption ratio of about 3% or lower while the porous material with $CaCO_3$ as the expanding agent had a higher absorption ratio and more open pores.
추용식,정의종,송훈,이종규,김영곤,강대구,Chu, Yong-Sik,Jung, Ui-Jong,Song, Hun,Lee, Jong-Kyu,Kim, Young-Gon,Kang, Dae-Gu 한국세라믹학회 2010 한국세라믹학회지 Vol.47 No.5
ALC was fabricated using cement, lime and quartzite by hydrothermal reaction. ALC has low strength and brittleness on account of inner pores. The studies for resolving these problems were driven by many researchers. Among these researches, the controls of quartzite fineness have been studied for unsuitable properties of ALC. This study experimented with variation of 90 ${\mu}m$ residue for obtain good physical properties. It was found that 90 ${\mu}m$ residue influenced on physical properties of ALC. The lower amount of 90 ${\mu}m$ residue, the higher compressive and bending strength. But the continuing decrease of 90 ${\mu}m$ residue did not cause the increase of strength. In order to application of these results in process, the states of process and hydrothermal products will be considered.