개질.수쇄한 전로슬래그의 시멘트 혼화재로 활용에 관한 연구

고인용,진병섭,김영환,Ko In-Yong,Jin Byung-Sub,Kim Young-Whan 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.5

전로슬래그에 시약급 $SiO_2$와 $Al_2O_3$를 5~10wt% 첨가하고 환원.개질후 수냉한후 시멘트 혼화재로의 사용을 검토하였다. 보통 포틀랜드 시멘트에 혼화재를 10~30wt% 혼합하여 9종류의 혼합시멘트를 제조하여, 혼화재의 종류와 혼합양에 따른 혼합시멘트의 모르타르 압축강도를 시험하고, 보통 포틀랜드 시멘트 모르타르의 압축강도와 비교하였다. 또한, 혼합시멘트의 수화반응을 주사전자현미경과 X선 회절로 분석하고, 시멘트 모르타르의 압축강도에 미치는 혼화재의 영향을 조사하였다. Converter slag was reduced and modified with the addition of 5~10 weight percent of $SiO_2$, $Al_2O_3$ and $SiO_2+Al_2O_3$. which was water quenched and used as a cement additives. Additive was mixed from 10 to 30 weight percent with ordinary portland cement and made 9 kinds of mixed cement. Compressive strength of mixed cement mortar was tested md compared with com pressive strength of ordinary portland cement mortar. Effect of hydration reaction on the compressive strength of cement mortar was investigated by means of x-ray diffraction and scanning electron microscopy.

논문 : 나노구조 몰리브덴늄실리사이드-실리콘카바이드 복합재료의 급속소결과 기계적 성질

고인용 ( In Yong Ko ),채승명 ( Seung Myoung Chae ),손인진 ( In In Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2010 대한금속·재료학회지 Vol.48 No.5

A dense nanostructured MoSi2-SiC composite was synthesized by a pulsed current activated combustion synthesis method within 2 min of one step from mechanically activated powders of Mo2C and Si. Simultaneous combustion synthesis and consolidation were accomplished under the combined effects of a pulsed current and mechanical pressure. Highly dense MoSi2-SiC with a relative density of up to 98% was produced under simultaneous application of an 80 MPa pressure and pulsed current. The average grain size and mechanical properties of the composite were investigated.

펄스전류활성 연소합성에 의한 나노구조 (Ti,Mo)Si2 제조 및 기계적 특성

고인용 ( In Yong Ko ),박나라 ( Na Ra Park ),오세훈 ( Se Hoon Oh ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.8

Nanopowders of Mo, Ti and Si were made by high-energy ball milling. A dense nanostructured (Ti,Mo)Si2 compound was sintered by the pulsed current activated combustion method within two minutes from mechanically activated powder of Mo, Ti and Si. A highly dense (Mo,Ti)Si2 compound was produced under simultaneous application of 80 MPa pressure and a pulsed current. The mechanical properties and micorostructure were investigated. The hardness and fracture toughness of the (Mo,Ti)Si2 were 1030 kg/mm2 and 4.9 MPa·m1/2, respectively. The mechanical properties were higher than monolithic TiSi2.

고주파유도 가열에 의한 나노구조 MoSi2-TaSi2 복합재료 제조 및 기계적 특성

고인용 ( In Yong Ko ),박나라 ( Na Ra Park ),손인진 ( In Jin Shon ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.5

Nanopowders of Mo, Ta and Si were made by high-energy ball milling. A dense nanostructured MoSi2-TaSi2 composite was sintered by the high-frequency induction heated combustion method within 2 minutes from mechanically activated powder of Mo, Ta and Si. A highly dense MoSi2-TaSi2 composite was produced under simultaneous application of a 80 MPa pressure and the induced current. Mechanical properties and microstucture were investigated. The hardness and fracture toughness of the MoSi2-TaSi2 composite were 1200 kg/mm2 and 3.5 MPa.m1/2, respectively. The mechanical properties were higher than those of monolithic MoSi2.

고주파유도 가열에 의한 나노구조 Fe-Si3N4 복합재료의 합성 및 급속소결

고인용 ( In Yong Ko ),두송이 ( Song Lee Du ),도정만 ( Jung Mann Doh ),윤진국 ( Jin Kook Yoon ),박상환 ( Sang Whan Park ),손인진 ( In Jin Shon ) 대한금속재료학회(구 대한금속학회) 2011 대한금속·재료학회지 Vol.49 No.9

Nanopowders of Fe3N and Si were fabricated by high-energy ball milling. A dense nanostructured 12Fe-Si3N4 composite was simultaneously synthesized and consolidated using a high-frequency induction-heated sintering method for 2 minutes or less from mechanically activated powders of Fe3N and Si. Highly dense 12Fe-Si3N4 with a relative density of up to 99% was produced under simultaneous application of 80 MPa pressure and the induced current. The microstructure and mechanical properties of the composite were investigated.

용융전로(熔融轉爐)슬래그와 $C_3A(3CaO{\cdot}Al_2O_3)$ 펠렛사이의 계면반응(界面反應)

김영환,고인용,Kim, Young-Hwan,Ko, In-Yong 한국자원리싸이클링학회 2005 資源 리싸이클링 Vol.14 No.5

As a basic study for recycling molten converter slag as an ordinary portland cement (OPC) by a conversion process, the reaction mechanism and the rate of the formation of $C_4AF$ which is one of the main components of OPC were investigated. The converter slag whose basicity was controlled by adding reagent grade $SiO_2$ was melted and hold for 30 minutes in MgO crucible at $1300^{\circ}C{\sim}1350^{\circ}C$. Then, the sintered CaO pellet heated at the same temperature was dipped into the molten slag and hold for $10{\sim}30$minutes. 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 $C_3A$ pellet was measured by the change of radius of the sintered $C_3A$ pellet, and the formed phase of $C_4AF$ was observed by SEM/EDX. As a result, the dissolution rate of $C_3A$ pellet into molten slag was increased from $0.75{\times}10^{-4}(cm/sec)$ at $1300^{\circ}C$ to $1.67{\times}10^{-4}(cm/sec)$ at $1350^{\circ}C$, and the mixed layer of $C_4AF$ and $C_{12}A_7$ was found between slag and $C_3A$ pellet. 용융전로슬래그를 일반 포틀랜드 시멘트로 활용하기 위하여, 용융슬래그와 $C_3A(3CaO{\cdot}Al_2O_3)$가 반응하여 시멘트의 구성상인 $C_4AF$가 생성되는 기구와 생성속도를 조사하고자 한다. 전로슬래그에 소정의 $SiO_2$를 첨가하여 MgO도가니에 넣고 $1300^{\circ}C{\sim}1350^{\circ}C$에서 30분간 가열 용해하여 균질화 한 후, 같은 온도로 가열해 둔 소결 $C_3A$펠렛을 투입하여 $10{\sim}30$분간 반응시켰다. 반응 후, 급냉한 시편을 도가니의 직경방향으로 절단해서 펠렛 단면의 $C_3A$직경 변화를 측정하여 $C_3A$의 용해속도를 조사하고, 계면반응 생성상을 SEM/EDX로 관찰하였다. 그 결과 $C_3A$ 펠렛의 슬래그로의 용해속도는 $1300^{\circ}C$에서 $0.75{\times}10^{-4}(cm/sec)$으로부터 $1350^{\circ}C$에서 $1.67{\times}10^{-4}(cm/sec)$으로 증가하였으며, 슬래그와 $C_3A$ 펠렛 사이에 $C_4AF$와 $C_{12}A_7$의 혼합층이 생성됨을 알 수 있었다.

용융전로(熔融轉爐)슬래그와 CaO펠렛의 상호반응(相互反應)에 미치는 $Al_{2}O_{3}$의 영향(影響)

김영환,고인용,Kim, Young-Hwan,Ko, In-Yong 한국자원리싸이클링학회 2006 資源 리싸이클링 Vol.15 No.2

용융전로슬래그로부터 일반 포틀랜드 시멘트로의 전환에 관한 기초 연구의 일환으로, 전로슬래그의 $Al_{2}O_{3}$ 농도에 따를 고체 CaO 입자와 용융슬래그간의 계면반응을 알아보고자 하였다. 염기도($B=CaO/SiO_2$)를 1과 2로 조정한 전로슬래그에 소정의 $SiO_2$와 $5{\sim}15wt%\;Al_{2}O_{3}$를 첨가제로 첨가하여 MgO도가니에 넣고 $1500^{\circ}C$에서 30분간 가열 용해하여 균질화 한 후, 같은 온도의 소결 CaO펠렛을 투입하여 $10{\sim}30$분간 반응시켰다. 반응 후 급냉한 시편을 도가니의 직경방항으로 절단해서 펠렛 단면의 CaO직경 변화를 측정하여 슬래그중 $Al_{2}O_{3}$첨가에 따른 CaO의 용해속도를 조사하고, 계면 생성층을 SEM/EDX로 관찰하였다. 그 결과, 슬래그의 염기도가 2인 경우, 염기도가 1인 경우 보다 생성층 $C_{3}S$상의 두께는 $Al_{2}O_{3}$를 15wt.%까지 첨가함에 따라 3.5배 증가하였으며, $C_{6}AF_{2}$ 또는 $C_{4}AF$양도 2배 정도 증가됨을 알 수 있었다. As a basic study on the conversion of molten converter slag to the ordinary portland cement, the effects of $Al_{2}O_{3}$ 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 $1500^{\circ}C$. 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 $Al_{2}O_{3}$ 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 $C_{3}S$ layer increased 3.5 times and quantity of $C_{6}AF_{2}\;or\;C_{4}AF$ phase increase 2 times than baisicy 1 slag.

고주파유도가열 연소합성에 의한 4.25 Co_0.53Fe_0.47-Al₂O₃ 복합재료 제조

박나라,남궁훈,고인용,손인진,Park, Na-Ra,NamKung, Hoon,Ko, In-Yong,Shon, In-Jin 한국분말야금학회 2009 한국분말재료학회지 (KPMI) Vol.16 No.2

Nanopowders of $Co_3O_4$ and FeAl were fabricated by high energy ball milling. Dense 4.25 $Co_{0.53}Fe_{0.47}-Al_2O_3$ composite was simultaneously synthesized and consolidated by high frequency induction heated combustion method within 2 min from mechanically activated powders. Consolidation was accomplished under the combined effects of a induced current and mechanical pressure of 80 MPa.

전로(轉爐)슬래그를 활용(活用)한 완효성(緩效性) 칼리 비료(肥料)의 제조(製造) 특성(特性)

양영호,김영환,고인용,Yang, Yeong-Ho,Kim, Young-Hwan,Ko, In-Yong 한국자원리싸이클링학회 2007 資源 리싸이클링 Vol.16 No.4

As a basic study for reusing converter slag as slow-release potassium fertilizer by a sintering process, powdery converter slag and reagent grade $SiO_2\;and\;K_2CO_3$ were mixed with ball mill above 24 hours and sintered at $900^{\circ}C{\sim}1000^{\circ}C\;for\;10{\sim}60$ min. Basicity of the mixed powder was controlled to 0.7, 1.0 and 1.4 and content of $K_2O$ was fixed with 22 mass%. After sintering, property of the potassium fertilizer was investigated with X-ray diffraction pattern and ICP analysis. Also effects of basicity, sintering temperature and time on the making slow-release potassium fertilizer was investigated. Water solubility of KBO in sample were decreased with sintering time, temperature and decreased with basicity. Citric acid solubility of $K_2O$ were increased with basicity and decreased with sintering temperature. 전로슬래그를 완효성 칼리비료로 활용하기 위한 기초연구로, 전로슬래그 분말에 시약급 $SiO_2$와 $K_2CO_3$를 첨가하여 염기도를 각각 0.7, 1.0및 1.4로 조절하고, $K_2O$의 함량은 22mass%로 고정한 후 볼밀에서 24시간 이상 혼합하여 $900^{\circ}C{\sim}1000^{\circ}C$ 사이의 온도에서 10분${\sim}$60분 동안 소결하였다. 소결 후 X-선 회절과 ICP분석을 이용하여 제조된 칼리비료의 특성을 조사하고 또한 염기도, 소결온도 및 소결시간이 완효성 칼리비료의 제조 조건에 미치는 영향을 검토하였다. 소결체의 수용성 $K_2O$의 용출특성은 소결시간이 길어질수록, 소결온도가 높아질수록, 염기도가 감소할수록 용출율이 감소하였다. 한편 구용성 $K_2O$의 용출특성은 염기도가 증가할수록 증가하는 경향이 뚜렷하였으며, 소결온도가 높을수록 용출율은 완만하게 감소하였다.

개질전로슬래그를 활용한 슬래그 시멘트 클링커 소성에 관한 연구

박선규,김영환,고인용,Park Sun-Ku,Kim Young-Whan,Ko In-Yong 한국자원리싸이클링학회 2002 資源 리싸이클링 Vol.11 No.6

전로슬래그를 환원개질한 후 -200/+325 mesh 입도로 분쇄하고, 시약급 CaO, $SiO_2$, $Fe_2$$O_3$등을 첨가하여 보통 포틀란트 시멘트를 형성할 수 있도록 조성을 조절한 펠렛을 제작하였다. 이 펠렛을 사용하여 $1250^{\circ}C$~$1450^{\circ}C$ 온도에서 각각 15분~45분간 소성실험을 하였다. 슬래그시멘트 클링커 제조에 적합한 최적의 소성조건은 $1450^{\circ}C$에서 20분간 이상 소성하는 조건이었고, 이렇게 제조한 슬래그시멘트를 사용한 모르타르의 압축강도는 보통 포틀란트 시멘트 모르타르보다 우수한 장기 강도를 나타내었다. Reduced and modified converter slag was ball milled and sieved to -200/+325 mesh. CaO,$SiO_2$, $Fe_2$$O_3$ was added to slag powder and mixed to make it similar to the composition of normal portlant cement. The pellet made of this powder was heated from $1250^{\circ}C$ to $1450^{\circ}C$ for 15 min~45 min. Most feasible condition for making slag cement clinker is the heating more than 20 min at $1450^{\circ}C$. The compressive strength of the mortar made of this slag cement clinker was better than that of normal port-lant cement in long time curing.