• Korean Journal of Soil Science and Fertilizer
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• v.26 no.2
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• pp.67-71
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• 1993

This study was carried out to develop the soil conditioner and/or the absorbent of high CEC with the natural zeolite poeder whose price was very low. The $SiO_2/Al_2O_3$ ratio & CEC of the natural zeolite were 6.78 and 67.5me/100g respectively. The CEC of the post-reaction product which was treated with 3N-NaOH and $Na_2O/Al_2O_3$ ratio. 9.5 for 8hours was about 200me/100g, which was the highest value than any other treatments. The dominant clay minerals were clinoptilolite, mordenite and smectite in natural zeolite, while phillipsite in the post-reaction product.

• The Journal of Natural Sciences
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• v.6 no.1
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• pp.103-108
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• 1993

Zeolites were discovered as a natural mineral more than two hundred ago. In the beginning, the mineral was used as ion-exchange material and adsorbent. After the end of World War II , however, a variety of zeolites have become available in large amounts because of the establishment of low temperature synthesis and the discobery of natural zeolite deposits of sedimentary origin. Various uses of xeolite were developed utilizing the unique crystal strucrure and function of these minerals. In connection with this development remakable progress has also been made in basic stuides on the related geology and mineralogy, crystallization from sols and gels, structure, ion exchange, adsorption and cataiysis. As a result, zeolites, which had been known only as mineral specimens displayed in museums. established a firm position among the high-technology masterials with excellent functional capabilities.

• Environmental Engineering Research
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• v.8 no.2
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• pp.98-106
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• 2003

• 한국신재생에너지학회:학술대회논문집
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• 2007.11a
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• pp.670-670
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• 2007

• Proceedings of the Korea Concrete Institute Conference
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• 1993.10a
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• pp.167-172
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• 1993

In domestic, there are not adequate admixtures for concrete now, so the study on that is required deeply, Accordingly the purpose of this study is to analyze the application possibilities of Natural Zeolite and Mud Stone as admixtures for concrete through comparing the compressive strength prorerties of mortar mixed with imported Silica Fume those mixed with domestic Zeolite and Mud Stone. As the results from this study, the optimum displacement rate of Silica Fume, Zeolite and Mud Stone is 15%, 5~10%, 15% respectively. In Zeolite and Mud Stone, the compressive strength is higher in proportion as the powder is fine. Consequentely, the application possibility the application possibility of Zeolite and Mud Stone is very sufficient as admixtures for concrete.

• Applied Chemistry for Engineering
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• v.5 no.6
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• pp.1024-1029
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• 1994

The characteristics of the nitrogen adsorption with natural zeolite produced in Kampo area according to the chemical treatment by HCl and/or NaOH or the exchanging metal ion were investigated in the pressure range of 100~760torr at $25^{\circ}C$. The amount of nitrogen adsorption was followed at increment in the order of NaOH treatment>nontreatment>HCl treatment. Adsorption amount on natural zeolite treated with 0.5N-HCl/NaOH was improved about 200%, whereas that on natural zeolite treated with 0.5N-NaOH/HCl was decreased. When metal ion of natural zeolite was exchanged with $Na^+$, $K^+$ and $Cs^+$, adsorption amount of nitrogen was decreased as the size of cation was increased. But metal ion of natural zeolite was exchanged with $Mg^{2+}$, $Ca^{2+}$ and $Ba^{2+}$, the amount of nitrogen adsorption was increased.

• Journal of Korean Society on Water Environment
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• v.20 no.2
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• pp.104-109
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• 2004

Removal of nutrients from domestic sewage or industrial wastewater is needed to protect surface waters from eutrophication. This research was carried out to remove the nitrogen (N) and phosphorus (P) from the wastewater using the iron oxide obtained from the steel industry and the natural zeolite, respectively. This research was conducted in both batch and continuous systems. The removal efficiency of the nutrients was evaluated in the batch system using the varying concentrations of zeolite and iron oxide added. The removal efficiency of N was 60% at the 8g of zeolite added. In the same condition, the removal efficiencies of N were 76% and 82% at 12g and 16g of zeolite added, respectively. Removal efficiency of P was 80% as 8g of iron oxide was added. The removal efficiency of P was correspondingly increased as the concentration of iron oxide was increased. Continuous column system was also used to evaluate the removal efficiency of N and P by the addition of zeolite and ferric oxide, respectively. Removal efficiencies of N were compared in the mixed packing, two stage, and four stage columns, respectively. The removal efficiencies (80%) of N in the separate packed columns (two and four stages) were higher than the mixed packing column (400%) after 90 hr. Whereas, the removal efficiencies of P were similar to each other in the three columns.

• Korean Journal of Soil Science and Fertilizer
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• v.26 no.3
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• pp.151-154
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• 1993

The magnitute of CEC of the reaction product which was produced by the treatment of the natural zeolite power(CEC : 67me/100g) with 3N-NaOH at $80^{\circ}C$ for 30 hours was determined to be about 260me/100g, which was the highest value in all reaction products. By the NaOH-treatment the contents of major clay minerals in natural zeolite was shown to be decreased and it is apparent that new phillipsite was synthesized. Furthermore it is interesting that the phillipsite contents was increased with longer reaction time and higher temperature. After 30 hours treatment the dorminant clay mineral in the reaction product was found to be phillipsite.

• Korean Journal of Materials Research
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• v.11 no.12
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• pp.1009-1013
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• 2001

The effects of coupling agent on the interface characteristics between epoxy resin and natural zeolite were studied by SEM, optical microscope and universal testing machine (UTM). Epoxy resin as a matrix was diglycidyl ether of bisphenol A (DGEBA)/4,4'-methylene dianiline (MDA)/malononitrile (MN) system and natural zeolite as an inorganic fillet was produced in Korea. With the increment of zeolite content, tensile strength decreased and it was due to the different elastic moduli of two materials. When external stress was loaded on the composites, the stress concentrated on the weakly bonded interface and crack grew easily. To improve the interface characteristics, the surface of the natural zeolite was treated with the silane coupling agent and it was found that the tensile strength was increased. The morphology of the interface showed that the bonding characteristics were modified by coupling agent.

• Analytical Science and Technology
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• v.13 no.3
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• pp.394-398
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• 2000

The mineralogical properties of natural zeolite comixed with montmorillonite were investigated by the chemical composition analysis, X-ray diffraction analysis, and differential scanning calorimetry. The experimental results on the removal of heavy metal ions by using the natural sample are summerized as follows. The removal of the heavy metal in solution is greatly influenced by the pH. Also, the removal capacity of heavy metal ions by zeolite and montmorillonite have increased in order of $Cu^{2+}>Cd^{2+}>Ni^{2+}$.