Korea Institute of Limestone and Advanced Materials

Danyang, South Korea

Korea Institute of Limestone and Advanced Materials

Danyang, South Korea
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Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | And 2 more authors.
Korean Journal of Chemical Engineering | Year: 2017

Our goal was to verify the manufacturing availability of local Korean natural hydraulic lime (K-NHL) using local Korean low-grade limestone and to test the basic physical properties on the basis of EU standards (BS EN 459-1:2015). We also sought to improve the physical properties of natural hydraulic lime by adding inorganic by-products such as blast furnace slag and silica fume. Where the inorganic by-products were not incorporated, properties such as soundness, air content, particle size, and water absorption (excluding compressive strength and setting time) did not show significant differences with the physical properties evaluated based on EU standards. Also, in terms of the composition of hydraulic phase, local Korean NHL A5 and A8 were similar to NHL 2 of EU standards, whereas local Korean NHL HL correlated with NHL 3.5 or NHL 5. When inorganic by-products were added, the compressive strength and setting time were improved. © 2017 Korean Institute of Chemical Engineers, Seoul, Korea


Hong C.-W.,Korea National University of Transportation | Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials
EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology | Year: 2015

Low environmental impact of operations on built environment is often a primary condition to be respected by construction designers and operators. Thus, recently, new technological solutions are proposed and new materials are investigated and used. For this reason, in recent years, natural fibers have been widely investigated, to be used as an alternative to carbon, glass or plastic fibers, in several composite applications for construction industry. Fiber reinforced inorganic materials, such as concrete or mortars are expected to present good mechanical properties (ex. flexible strength, cracking resistance, brittle fracture, etc.) under high dynamic loading conditions. Basalt fibers are 100% natural and inert. They're stronger and more stable than alternative mineral and glass fibers, with tenacity that exceeds steel fibers many times over. Furthermore, basalt fibers, which are being increasingly investigated in structural applications, are also expected to present good performance under high strain-rate conditions. In this study, Physico-mechanical properties and the microstructure of basalt fiber with mixing ratio reinforced hydraulic lime-based mortars were investigated.


Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Ahn J.-W.,Korea Institute of Geoscience and Mineral Resources
EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology | Year: 2015

In isothermal techniques many methods of kinetic analysis have been used for determining the reaction mechanism, i.e. the kinetic model f (α). In the present study, isothermal methods of kinetics analysis are used to investigate the kinetics of the thermal decomposition of calcium carbonate. The calcination reaction of five different types of limestone samples which were taken from different regions of republic of Korea was investigated by using data of loss of ignition. Various models were applied to the experimental results and it was found the shrinking core model with surface reaction rate controlling mechanism is the best model fitting the experimental data. Three values such as mass transfer coefficient, diffusivity and activation energy are determined, depending on calcinations temperature, calcinations time, crushing size and the origin and genesis of various limestone. Application of this model to the experimental data showed that the thermal activation energies of various limestone samples change in the range 19 ∼53.3 kcal/mol.


Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Ahn J.-W.,Korea Institute of Geoscience and Mineral Resources
EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology | Year: 2015

Mg-based lime pastes and mortars were prepared in order to study the evaluation of the compound and mechanical properties during the carbonation process. In order to characterize the chemical compounds formed in pastes made with kind of lime, XRD, DSC, SEM, porosity and compressive strength were performed at different curing days. Mg(OH)2 does not carbonate under normal conditions, and in a CO2 rich atmosphere Mg(OH)2 generated several unidentified Mg-carbonates with amorphous structure in complexity carbonate system of CaO - MgO - Al compounds - Si compounds.


Seo J.-H.,Korea Institute of Limestone and Advanced Materials | Baek C.-S.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Ahn J.-W.,Korea Institute of Geoscience and Mineral Resources
EARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology | Year: 2015

It studies that effect of lim estone 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 Korean limestones. 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 depentdent 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. Therefore, limestone of FGD is more advanced physical characteristic, it will be able to improve on the performance of FGD.


Hwang D.J.,Korea Institute of Limestone and Advanced Materials | Hwang D.J.,Chungbuk National University | Ryu J.Y.,Ulimeng Co. | Park J.H.,Ulimeng Co. | And 6 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2013

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 98.2wt.% by EF for 240min, and 97.8wt.% by BM for 30min at the same temperature of 950°C. 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°C, 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. © 2013 The Korean Society of Industrial and Engineering Chemistry.


Hwang D.J.,Korea Institute of Limestone and Advanced Materials | Hwang D.J.,Chungbuk National University | Ryu J.Y.,Ulimeng Co. | Park J.H.,Ulimeng Co. | And 5 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2012

Mega-crystalline calcite (m-CC) breaks apart easily during calcination, and is converted to CaO with difficulty due to its thermal decomposing characteristics that necessitate large heat consumption. To overcome this problem, m-CC was calcined using either a microwave furnace or an electric furnace for 15. min and 30. min at 950. °C.Following 15 and 30min calcinations of m-CC, almost all (96.6wt%) and all (100%) of the calcite was calcined to CaO in the microwave furnace, compared to only 11.3wt% and 11.0wt% in the electric furnace, respectively. The excellent conversion rate in the microwave furnace was attributed to its internal heating method. Therefore, calcination of m-CC to CaO was optimized in the microwave furnace at 950°C for 30min. The results demonstrated the potential for the microwave furnace calcination of m-CC, previously known as a non-calcinable material, as a material source for CaO, Ca(OH) 2 and CaCO 3. © 2012 The Korean Society of Industrial and Engineering Chemistry.


Moon K.-Y.,Korea Institute of Limestone and Advanced Materials | Choi M.-K.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | Cho K.-H.,Korea Institute of Limestone and Advanced Materials | Ahn J.-W.,Korea Institute of Geoscience and Mineral Resources
Journal of the Korean Ceramic Society | Year: 2016

This study aims to produce dolomitic hydraulic lime (D-NHL) using domestic low grade dolomitic limestone and to determine the effect of adding blast furnace slag (BFS) and gypsum as part of an investigation of the hydration properties of D-NHL to increase the mechanical properties. The main mineral phases of D-NHL as a hydraulic lime binder were Ca(OH)2, Mg(OH)2, C2S, C3S, and MgO residues. Ca(OH)2 transformed into CaCO3 in D-NHL paste over the period of 28 days, but the carbonation of Mg(OH)2 and the hydration of C2S did not occur until hydration, after 28 days. Through an investigation of the hydration properties of D-NHL pastes mixed with BFS and gypsum, Al-based compounds such as calcium aluminate hydrates (C4AH13) and ettringite were observed at early hydration time. The compressive strength was improved due to the increased quantities of these hydration products. These results show that good performance results from the application of dolomitic hydraulic lime and that a high value product can be made from domestic waste materials. © 2012 All Right Reserved.


Hwang D.J.,Korea Institute of Limestone and Advanced Materials | Ryu J.Y.,Ulimeng Co. | Yu Y.H.,Korea Institute of Limestone and Advanced Materials | Cho K.H.,Korea Institute of Limestone and Advanced Materials | And 3 more authors.
Journal of Industrial and Engineering Chemistry | Year: 2014

In the conventional kiln, mega-crystalline calcite (m-CC) breaks apart easily during calcinations, and cannot be easily converted to CaO due to that it requiring a lot of heat. In this study, m-CC was calcined to CaO of around 1mm using the rotary microwave kiln. Furthermore, CaCO3 was produced by the carbonation process and hydrothermal process, and the form of CaCO3 was characterized. Calcination of m-CC using the rotary microwave kiln resulted in CaO (97. wt%) of relatively fine size. CaCO3 of colloidal-shaped and 6μm in size could be prepared by applying the carbonation process to Ca(OH)2 using a bubble reactor at 25°C. As the carbonation temperature increased from 25 to 80°C, the shape of prepared CaCO3 changed from a colloidal-type to spindle-type of 1μm due to self-assembly. Also, hexagonal-shaped aragonite could be prepared by the hydrothermal process with the supersaturated Ca(HCO3)2 solutions. © 2013 The Korean Society of Industrial and Engineering Chemistry.


Baek C.-S.,Korea Institute of Limestone and Advanced Materials | Baek C.-S.,Kwangwoon University | Seo J.-H.,Korea Institute of Limestone and Advanced Materials | Cho J.-S.,Korea Institute of Limestone and Advanced Materials | And 2 more authors.
Journal of the Korean Ceramic Society | Year: 2016

Characteristics of wet flue gas desulfurization and in-furnace desulfurization of domestic and overseas limestone with different crystallinity and crystalline size are studied in this article. Properties of desulfurization were evaluated in relation to physicochemical/ mineralogical characteristics, degree of pore formation for different calcination temperatures and TNC(total neutralizing capability). TNC of domestic high crystalline limestone was lower than that of overseas one. On the other hand, the porosity after calcination was shown to be relatively high for domestic limestone, which had high initial rates of desulfurization reactions in-furnace. Based on low pore formation and porosity with high TNC of crystalline high-Ca limestones compared to macrocrystalline ones, the former are preferred for wet desulfurization processes.

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