• Title, Summary, Keyword: domestic natural zeolite

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The Investigation for the Possibility to Utility on the Natural Zeolite and Mud Stone as Admisxture (혼화재로서 천연제올라이트 및 이암의 활용성 검토에 관한 연구)

  • 김화중;김태섭;박정민;한종훈
    • Proceedings of the Korea Concrete Institute Conference
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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.

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A Sutdy on Cesium Adorption by Domedtic Zeolite (국산 불석의 세슘 흡착 특성에 관한 연구)

  • 이원근
    • Journal of the Korean institute of surface engineering
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    • v.21 no.1
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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.

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Removal Nitrogen and Phosphorus from Wastewater using Natural Zeolite and Iron Oxide (천연 Zeolite와 산화철을 이용한 폐수 중 질소 및 인의 처리)

  • Weon, Seung-Yeon;Lee, Sang-Ill
    • 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.

A Study on the Phase Identification and Ion-Exchange Behavior of NH4+ at Natural Zeolite (천연제올라이트의 상규명 및 아모니아 제거 특성)

  • Kim, Wha-Jung;Yoo, Jae-Churl;Lee, Myung-Churl;Lee, Gee-Jung
    • Applied Chemistry for Engineering
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    • v.7 no.1
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    • pp.43-50
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    • 1996
  • A series of domestic natural zeolites were investigated to identify the phase and to study the capability of $NH_4{^+}$-ion removal from solution system. It was proved that the natural zeolite from Young-II bay area was thermally unstable zeolite, heulandite by XRD and FT-IR analyses. In addition, the heulandite exchanged by $K^+$ ion showed the highest thermal stability upon heat-treatments. However, the best capability of removing $NH_4{^+}$-ion from the solution system was the non-exchanged zeolite.

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Sewage and Tissue Wastewater Treatment Using Quartz Porphyry and Natural Zeolite (맥반석과 천연제올라이트를 이용한 도시하수와 화장지폐수처리)

  • Lee, Chang Hyun;Kim, Jae Yong
    • Journal of Korean Society of Environmental Engineers
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    • v.34 no.8
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    • pp.517-522
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    • 2012
  • In this study, not only making an effort to find a solution for sewage and wastewater treatment, but also demonstrating a feasibility of wastewater disposal process which is treated with the cohesion and adsorption mechanism of sewage and wastewater using quartz porphyry and zeolite, which is a domestic natural resource. By using a jar test, we evaluated removal efficiency of $COD_{Cr}$ after reation. According to the result of experiment, when we injected 400~1,200 g/L of quartz porphyry and zeolite into a sewage as a coagulant, there was no difference of the rejection rates of $COD_{Cr}$, however, when quartz porphyry and zeolite, which were sintered at $600^{\circ}C$, were treated into urban sewage, removal efficiency of $COD_{Cr}$ had increased by about 15%, 3% respectively. In addition, we applied into a cosmetic tissue wastewater by using mixture of quartz porphyry and natural zeolite in order to analyze the applicability of other wastewater as well as Municipal Sewage.

Comparions of Removal Performances of Divalent Heavy Metals by Natural and Pretreated Zeolites (천연 및 전처리 제올라이트에 의한 2가 중금속 이온 제거능의 비교.검토)

  • 감상규;김덕수;이민규
    • Journal of Environmental Science International
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    • v.8 no.3
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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.

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The High-Strengthening of Concrete with Admixture - On the Artificial Lightweight Aggregate Concrete- (혼화재에 의한 콘크리트의 고강도화에 관한 실험 연구(II) -인공경량골재 콘크리트를 대상으로-)

  • 김화중;김태섭;이용철;박정민
    • Proceedings of the Korea Concrete Institute Conference
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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.

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Assessment of Physicochemical Properties of Domestic Bentonite and Zeolite as Candidate Materials for a Engineered Barrier in a Radwaste Repository (방사성폐기물 처분장 공학방벽 재료로서의 국산 벤토나이트 및 제올라이트에 대한 물리화학적 특성 평가)

  • 정찬호
    • The Journal of Engineering Geology
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    • v.9 no.2
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    • pp.89-100
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    • 1999
  • This study was carried out to assess the physicochemical properties of domestic bentonites and zeolites from Tertiary Formation as the candidate material for a engineered barrier of a radioactive waste repository. Natural bentonite and zeolite samples were collected from nine bentonite mines and six zeolite mines in Yeonil-Gampo area. The commercial products of bentonite and zeolite were obtained from local companies. The collected samples were investigated to study the following physicochemical properties: X-ray diffraction patterns, swelling, cation exchange capacity(CEC), specific surface area, montmorillonite content, pH, organic carbon content, thermal property, microstruciure and chemical composition. Based on the physicochemical properties of bentonite and zeolite, the bentonites from U-41 and G-46 mines and the zeolites from Daedo and Y-1 mines are regarded as the most desirable candidate materials.

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The Fundamental study on Development of high performance Floor materials using the Zeolite and Stone dust (제올라이트와 석분을 이용한 고성능 바닥재의 개발에 관한 기초적 연구)

  • 류희정;임병호;최영준;이승조;김태곤;박정민;김화중
    • Proceedings of the Korea Concrete Institute Conference
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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.

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