• Environmental Engineering Research
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• 제8권2호
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• pp.98-106
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• 2003

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
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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.

• 한국표면공학회지
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• 제21권1호
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• pp.47-52
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• 1988

The purpose of th this study was to determine an adsorption capaty of cesium by domestic zeolite, clinoptilolite, which has adsorption selectivity and resistence to radiolytic degradation, and to find the operation of column packed natural or Na cinoptiloite. The exchange capacity of cesium was 0, 875 m eq-per gram of clinopilolite. Na clinoptilolite was mire effective for cesium removal than naturl clioptilolite. Then, the results show that the domestic cilnoptilolite activated with sodium hydroxide colud be applicable for removal of cesium from liquid radwastes.

• 한국물환경학회지
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• 제20권2호
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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.

• 공업화학
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• 제7권1호
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• pp.43-50
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• 1996

Clinoptilolite 계열의 국내산 천연제올라이트에 대한 상규명과 암모늄 이온 제거능력에 대해 연구하였다. 영일만 지역에 매장되어 있는 국내산 천연제올라이트는 XRD와 FT-IR 분석에 의해 열적으로 불안정한 heulandite임이 증명되었다. 또한 $K^+$ 이온으로 이온교환된 heulandite가 가장 높은 열적 안정성을 보였다. 그러나 암모늄이온의 제거능력에 있어서는 이온교환하지 않은 제올라이트가 가장 우수한 제거능력을 보였다.

• 대한환경공학회지
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• 제34권8호
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• pp.517-522
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• 2012

본 연구에서는 오 폐수의 처리에 있어서 천연제올라이트 및 맥반석을 활용하여 오 폐수의 응집 및 흡착 메커니즘에 적용하여 수처리제로서의 타당성을 검토하고자 하였다. Jar test를 이용한 응집 전 후의 $COD_{Cr}$의 제거율을 평가하였다. 맥반석과 천연제올라이트를 수처리제로써 주입량을 400~1,200 g/L로 변화시켜 처리한 결과 $COD_{Cr}$ 최종제거율은 별 차이를 보이지 않았으나, 맥반석과 천연제올라이트를 $600^{\circ}C$로 소결하여서 도시하수를 처리할 경우 $COD_{Cr}$제거율이 각각 15%, 3%정도 상승하였다. 또한 맥반석과 천연제올라이트를 혼합하여 미용화장지 폐수처리에 적용하였으며, 또 다른 폐수처리제로서의 가능성을 검토하였다.

• 한국환경과학회지
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• 제8권3호
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• pp.399-409
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• 1999

The three domestic natural zeolites(Yong dong-ri (Y), Daesin-ri (D), Seogdong-ri (S)) harvested in Kyeongju-shi and Pohang-shi, Kyungsangbug-Do, were pretreatd with each of the NaOH, $Ca(OH)_2$ and NaOH following HCl solutions, and the removal performances of divalent haevy metals(Cu, Mn, Pb, and Sr) for natural and pretreated zeolites were investigated and compared in the single and mixed solutions. The natural zeolite-heavy metal system attained the final equilibrium plateau within 20 min, irrespective of initial heavy metal concentration. The heavy metal uptakes increased with increasing initial heavy metal concentration and pH. The heavy metal uptakes for natural zeolites decreased in the following sequences : D>Y>S among the natural zeolites; Pb>Cu>Sr>Mn among the heavy metals. The pretreated zeolites showed higher heavy metal removal performances than natural zeolites and decreased in the order of NaOH, NaOH following HCl, $Ca(OH)_2$ treatment among the pretreatment methods. The heavy metal ion exchange capacity by natural and pretreated zeolites was described either by Freundlich equation or Langmuir equation, but it followed the former better than the latter. The heavy metal uptakes for natural zeolites decreased in the mixed solution, in comparing with those in the single solution and especially, the manganese uptake decreased greatly in the mixed solution. The pretreated zeolites showed the improved removal performances of heavy metals in the mixed solution than in the single solution and the heavy metal uptakes by those in the mixed solution showed the same trends in the single solution among the chemical treatment methods and heavy metals.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1993년도 가을 학술발표회 논문집
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• pp.118-123
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• 1993

The purpose of this study is to put to practical use the economical high-strength lightweight concrete manufactured by domestic materials, through the analysis on the properties of lightweight concrete with the natural zeolite and mud stone abundant in domestic and compare them with those with silica fume. As a result, it was possible to gain proper workability in the lightweight concrete with admixtures through using the superplasticizer. the optimum replacement rate of zeolite and mud stone powder is respectively 5~10%, 10~15% on unit-cement amount. The strength development rate for plain concrete is 27%, 18% at optimum replacement rate.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1997년도 가을 학술발표회 논문집
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• pp.785-790
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• 1997

In domestic, it is not a little results to use natural mineral, stone and sludge as a construction materials. Accordingly, it is required to study for higher application from of resources these materials in its economic and environmental aspects. So, the purpose of this study is to develop the excellent construction materials, a as compare with existing floor materials in material capacity and economic aspects, using natural zeolite, stone dust and sludge. In this viewpoint, this paper investigated to the required capacity such as, compressive strength, bending strength and absorption according to experiment.

• 지질공학
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• 제9권2호
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• pp.89-100
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• 1999

핵폐기물 처분장 공학방벽재로서의 우리나라 제 3 기층에서 산출되는 벤토나이트와 제올라이트의 활용 가능성을 물리화학적 특성을 중심으로 평가하였다. 연일 및 감포일대 제 3 기층의 9개 대표적인 벤토나이트 광산과 6개의 제올라이트 광산에서 채취한 자연산 시료와 관련회사의 추천상품시료에 대해 X-선 회절 분석, 팽윤도 측정, 양이온교환능 측정, 비표면적 측정, 몬모릴로나이트의 함량계산, 유기탄소함량 분석, 시차 열분석(DTA), 편광현미경 관찰, 주사전자현미경(SEM)관찰 및 전자현미분석(EPMA)을 실시하여 각 분석항목을 비교 평가하였다. 연구결과를 종합하면 U-41 및 G-46의 광산에서 산출되는 벤토나이트와 대도 및 Y-1호 광산의 제올라이트가 인공방벽재료로 갖추어야할 물리화학적 특성이 최적인 것으로 평가된다.