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황대주,한춘,Young Hwan Yu,Seung Kwan Lee,Moon Kwan Choi,Kye Hong Cho,Ji Whwan Ahn,이종대 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.6
Environment-friendly lime paints were prepared from 38 wt% slurries of hydrated lime (Ca(OH)2) and hydrated light burned dolomite (Ca(OH)2·Mg(OH)2). These materials and the resulting paints’ antibacterial and antimold properties were investigated. The hydrated lime used in this study contained 97 wt% Ca(OH)2, which implies a 71.85 wt% equivalence of CaO. This 71.85 wt% CaO content was responsible for the antibacterial and anti-mold characteristics. The antibacterial and anti-mold characteristics of the hydrated light burned dolomite were attributed to its 56 wt% CaO and 44 wt% MgO contents. The antibacterial-reducing activities of 38 wt% hydrated lime and hydrated light burned dolomite slurries were found to be 99%. Their anti-mold activities against mixed strains were outstanding. Lime paints produced from the slurries and various additives also showed 99% antibacterial activity and outstanding anti-mold activity. The paints’ low total volatile organic compounds (TVOCs) releases were graded as excellent. Their formaldehyde (HCHO) releases were classed as best through excellent, indicating their suitability as environment-friendly building materials.
황대주,한춘,류재용,박정호,유영환,최문관,조계홍,안지환,이종대 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.5
Mega-crystalline calcite (m-CC) breaks apart easily during calcination, and cannot be easily converted to CaO due to its characteristic that requires massive heat consumption. To solve this problem, the calcination characteristics were compared using electrical furnace (EF) and batch type microwave kiln (BM). After hydrating the manufactured CaO, Ca(OH)2 was produced, and through the carbonation process, CaCO3 was synthesized. The results of the XRD pattern of CaO that was formed through calcinations indicated that decarbonation reaction occurred as 98.2 wt.% by EF for 240 min, and 97.8 wt.% by BM for 30 min at the same temperature of 950 8C. Hydration results revealed that CaO by EF was high-reactive whereas CaO by BM was medium-reactive. CaCO3 was synthesized through the carbonation process. At 25 8C, in both cases, colloidal-shaped CaCO3 was found, and the more spindle-shaped CaCO3 by cubic-shaped self assembly was synthesized at higher temperatures. However, in case of EF, Ca(OH)2 existed in products.
강산성 양이온 교환수지에 의한 백운석으로부터 CaCO<sub>3</sub>/MgO 합성 조건
황대주,백철승,유영환,조계홍,안지환,김성룡,김호성,한춘,이종대 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
백운석의 이론적 조성은 CaO 30.4 wt%, MgO 21.7 wt%, CO<sub>2</sub> 47.9 wt%이며, 이론적 열분해 온도는 MgCO<sub>3</sub> 800°C 내외, CaCO<sub>3</sub> 950°C 내외에서 탈탄산화 반응을 한다. 백운석의 활용은 제강/제철용인 탈황/탈인 제거로 이용한다. 이에 단순 제강/제철용 소재에서 탈피하여 백운석의 Ca/Mg 분리하기 위해 강산성 양이온 교환수지을 통하여 CaCO<sub>3</sub>/MgO 합성 특성을 알아보았다. 백운석의 크기는 25~30mm를 이용하여 마이크로웨이브 소성로에 의해서 CaO-MgO를 제조하였다. 백운석로부터 CaCO<sub>3</sub>/MgO를 합성하기 위하여, 경소백운석과 강산성 양이온 교환수지(1:12 wt%)로, 전기전도도가 초기에 24mS/cm에서 0.1mS/cm로 변화 될 때까지 반응 시켰으며, pH는 12.4에서 10, 반응 시간은 30분이였다. CaCO<sub>3</sub>의 합성은 Ca<sup>2+</sup> 흡착된 교환수지(Ca(R-SO<sub>3</sub>)<sub>2</sub>(s))를 넣고, NaOH을 이용하여 pH를 12로 적정 후, CO<sub>2</sub> 가스 200 cc/min로 투입하였다.
강산성 양이온 교환수지를 통한 백운석으로부터 CaCO3 및 MgO/Mg(OH)2 합성에 관한 연구
황대주,유영환 한국화학공학회 2019 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.57 No.6
Two dolomite samples mined from the different mines were calcined using a batch-type microwave kiln (950 oC/60 min) to produce CaO·MgO. The hydration of the CaO·MgO samples shows different reactivity. MgO was separated by reacting with a strong acid cation exchange resin using the reactivity of the hydration properties of light dolomite (CaO·MgO). Calcium (Ca-(R-SO3)2) was separated from the prepared CaO·MgO by the cation exchange resin (CaO·MgO : R-SO3H = 1:12 mass %). High purity MgO (higher than 94 mass %) with unburned CaCO3 (1~2 mass %) was obtained by the separation process. The separated MgO was heated at 950℃ for 60 minutes to afford high purity MgO with MgO content higher than 96%. And High-grade CaCO3 was prepared from the reaction with calcium adsorbed resin (Ca-(R-SO3)2) and NaOH, CO2 gas. 국내에서 채광되는 백운석(dolomite, CaMg(CO3)2)을 회분식 형태의 마이크로웨이브 소성로(950 oC/60 min)에 의해소성하여 경소백운석(CaO·MgO)을 제조하였다. 국내에서 산출된 두 개의 백운석 시료를 대상으로 경소백운석(CaO·MgO) 제조 후 수화 특성을 규명한 결과 반응성이 다름을 규명하였다. 경소백운석(CaO·MgO)의 수화 특성의 반응성을 이용하여 강산성 양이온 교환수지와 반응 시켜서 MgO를 분리하는 조건을 실시하였다. 분리 실험 조건은 경소백운석(CaO·MgO)과 R-SO3H (1:12 mass %)로 칼슘이온 흡착(Ca-(R-SO3)2)하여 MgO를 분리하였다. 분리 후 MgO의함량은 94 mass % 이상으로 분리되었다. 분리된 MgO를 950 oC, 60 min 동안 열처리 후 MgO의 순도는 96 mass %로나타났다. 그리고 칼슘 이온이 흡착된 강산성 양이온 교환수지(Ca-(R-SO3)2)와 NaOH, CO2 gas 반응에 의해서 98 mass %의CaCO3를 합성하였다.
황대주,김호성,이승관,최문관,김환,이종대,Hwang, Dae-Ju,Kim, Ho-Sung,Lee, Seung-Kwan,Choi, Moon-Kwan,Kim, Hwan,Lee, Jong-Dae 한국세라믹학회 2009 한국세라믹학회지 Vol.46 No.1
Lime paint surpassing others in execution efficiency, anti-bacterial, anti-mold and small quantity emission of VOCs(Volatile Organic Compounds) characteristics was developed using a limestone as raw materials. The lime paint prepared by mixing slaked lime($37{\sim}40\;wt%$), PVA:EVA(9 wt%:1 wt%), talc(23 wt%), $TiO_2$(14 wt%), zeolite (3 wt%), antifoaming agent(5 wt%), wetting agent (5 wt%) was indicated over 99.8% of anti-bacterial and anti-mold characteristics. Also, the environment-friendly function of the lime paint was confirmed by detection of small amount of TVOCs($0.01\;mg/m^2h$) and formaldehyde($0.008\;mg/m^2h$). Execution efficiency, economy-and environment-friendly characteristics of this lime paint can make up for defects of established paints. And, it also presents the advantage of a limestone as high value added materials.
황대주,한춘,유영환,백철승,이금미,조계홍,안지환,이종대 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.30 No.-
Domestic medium-grade limestone(CaO 53%) is calcined to form CaO for use in steel industries. On theother hand, low-grade limestone(CaO 52%) is directly used for stack-gas desulfurization. In this study,the strongly acidic cation exchange resin (SCR) process was used to obtain high purities. X-ray diffraction results indicated that the calcined product from medium-grade limestone was CaO(98.6 wt%) and SiO2 (1.4 wt%), and that the product from low-grade limestone was composed of CaO(97.6 wt%) and SiO2 (2.4 wt%). Hydration reactions revealed 96.7 and 94.0 wt% of Ca(OH)2, and theamount of CaCO3 increased because of the reaction of HCO3in aqueous solutions during the slakingreaction. To prepare precipitated calcium carbonate (PCC, CaCO3), the adsorption of calcium ion and recoveryreaction were conducted with the prepared CaO and cation exchange resin(R-SO3H) (1:24 kg:kg). High-grade PCC was prepared from the reaction with calcium-adsorbed resin(Ca-(R-SO3)2) and NaOH. AlthoughCa(OH)2 is amorphous, Ca(OH)2 by calcium adsorption is plate-type and can be used as a plastic filler. Calcium ion was recovered as CaCl2 solution by calcium-adsorbed resin(Ca-(R-SO3)2) and HCl. This solutionwas concentrated and dried to form CaCl2, which was used to form high-grade PCC, Ca(OH)2, and CaO.
굴 패각의 소성 조건에 따른 소석회의 특성과 외부용 수성 도료 적용 연구
황대주,유영환,한창수,이종대,Hwang, Dae Ju,Yu, Young Hwan,Han, Chang Soo,Lee, Jong Dae 한국화학공학회 2022 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.60 No.4
CaO was prepared by calcining for oyster shells using a microwave kiln. It was analyzed to Ca(OH)<sub>2</sub> synthed on hydration reaction from prepared CaO. The synthesized Ca(OH)<sub>2</sub> was formulated as an external water paint. Oyster shells (325 mesh, 43 ㎛) were decarbonized for (a) 950 ℃/1 hr and (b) 1,150 ℃/1 hr to prepare CaO. In the calcination condition of (a), CaO was 56.7 wt%, and in the calcination condition of (b), CaO was 100 wt%. To compare CaO by calcination of oyster shells with that of limestone, limestone (25~30 mm) was decarbonized at 950 ℃/1 hr to prepare CaO, and as a result of the analysis(XRD), it was analyzed as CaO 100 wt%. CaO was prepared under the calcining conditions of oyster shells (b) 1,150 ℃/1 hr, and Ca(OH)<sub>2</sub> was synthesized through hydration. Hydration conditions of the prepared CaO were (a) CaO : H<sub>2</sub>O(100 g : 200 g) and (b) CaO : H<sub>2</sub>O(100 g : 400 g). As a result of the hydration reaction, it was confirmed as low reactivity. 100 wt% of Ca(OH)<sub>2</sub> was synthesized. In particular, Ca(OH)<sub>2</sub> synthesized under the hydration condition of (a) was analyzed in a plate shape. An external water paint was formulated with Ca(OH)<sub>2</sub> synthesized from oyster shells as the main component. When 15 items of the external water paint standard specification (KS M 6010) were analyzed, it was confirmed that all other criteria were satisfied except for freezing stability.