• Title/Summary/Keyword: zeolite powder

Search Result 96, Processing Time 0.029 seconds

Extinguishing Characteristics of Zeolite adsorbed Dry Chemical Powder (분말 소화약제가 흡착된 제올라이트의 소화 특성)

  • Shin, Changsub;Park, Hojun
    • Journal of the Korean Society of Safety
    • /
    • v.27 no.6
    • /
    • pp.59-63
    • /
    • 2012
  • The use of dry chemical powder has been increased as it can be stored for a long period and sustain in stable condition compared to gas or liquid phase extinguishing agents. A new type of dry chemical powder using Zeolite was produced in the research. Chemical powder was adsorbed into Zeolite 13X, a porous material appearing negative catalytic effect, to create extinguishing powder obtaining core shell structure and measured physical properties and run a small scale fire extinguishment. SEM, XRD, TA analysis was also executed, and extinguishing characteristics were measured by fire extinguishing experiment on oil pool fire. The experiment showed that the average particle size of Zeolite 13X was equivalent, indicating about $3{\pm}1{\mu}m$ and thermal analysis result illustrated that Zeolite 13X showed exothermic reaction peaks at $900^{\circ}C$ due to solid-state transformation. Extinguishing characteristics on oil fire of $NaHCO_3$/Zeolite 13X and $NH_4H_2PO_4$/Zeolite were improved, influenced by adsorbed extinguishing powders on Zeolite 13X and Zeolite 13X that contains high phase transition temperature.

A Study on the Removal of Heavy Metal with Mg-Modified Zeolite

  • Wang, Jei-Pil;Kim, Gyu-Cheol;Go, Min-Seok
    • Journal of Powder Materials
    • /
    • v.27 no.4
    • /
    • pp.287-292
    • /
    • 2020
  • The subject of this study is a zeolite generated as a by-product of recycling LAS (lithium-aluminum-silicate) resources, a kind of glass and ceramic produced by induction. The zeolite by-product is modified into Mg-zeolite using Mg as a cation to absorb Pb, a heavy metal generated from water pollution caused by recent industrial wastewater. An ion-exchange method is used to carry out the modification process, from zeolite byproduct to Mg-zeolite, and simultaneously absorb the Pb in the heavy-metal solution (99.032 mg/L). It is found that the sodium zeolite in the raw material residue can be modified to magnesium zeolite by reacting it with a mixture solution at 1 M concentration for 24 h. As a result, it is found that the residual Pb (0.130 mg/L) in the heavy metal solution is shown to be absorbed by 99.86%, with successful formation of a Mg-modified zeolite.

Adsorption of PCBs in Transformer Oil on Powder Activated Carbon and Synthetic Zeolite (활성탄과 합성 제올라이트를 이용한 폐절연유 내 PCBs 흡착)

  • Chu, Heon-Jik;Choi, Sung-Woo
    • Journal of Environmental Science International
    • /
    • v.21 no.5
    • /
    • pp.573-578
    • /
    • 2012
  • In this study, adsorption of polychlorinated biphenyls(PCBs) in transformer oil on powder activated carbon (PAC) and synthetic zeolite was evaluated. Adsorption characteristics of PCBs on the PAC and zeolite has been investigated in a batch system with respect to adsorbents amount and contact time. BET results showed 908 m2/g for PAC and 483 m2/g for zeolite. The adsorption capacity of PCBs increased with an increasing input amount of absorbent. The adsorption experimental results showed that PAC removed 90% of input PCBs in transformer oil while zeolite removed only 64%. Adsorption of PCBs to PAC and zeolite fit the Freundlich model well. The Freundlich parameter, Kf, for PAC and zeolite was 193.1 and 43.0 respectively, indicating that PAC is effect adsorbent for PCBs adsorption in transformer oil.

Synthesis of zeolite A membranes on alumina support by hydrothermal reaction (수열반응에 의한 알루미나 지지체에 제올라이트 A 박막의 합성)

  • Ko, Tae-Seog
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.17 no.3
    • /
    • pp.95-101
    • /
    • 2007
  • The synthesis of NaA zeolite membrane on a porous alumina support from clear solution by using hydrothermal reaction was investigated. Effects of reaction temperature, reaction time and seeding for transformation of zeolite A membrane and powder which are produced in the reactor were monitored through X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). The transformation process of producing Zeolite A membrane starts from the formation of the compact and continuous membrane on the surface of porous support from clear solution. The large Zeolite A poly-crystal was then farmed through the dissolution process. Finally, the process was advanced from sodalite to amorphous. In case of powder, sodalite is formed in the early stage of reaction because of surrounding space difference between membrane and powder crystal. Discrete surrounding space of powder crystal makes easy to transform to sodalite. From Zeolite A to amorphous through transformed product was rapidly advanced at high temperature while the membrane with somewhat low coverage was obtained at low temperature. A compact and continuous zeolite A membrane was synthesized at $120^{\circ}C$ in 12-hour period.

Development of MA Packaging Materials for Freshness Extension of Fruits and Vegetables(2) (과실 채소류의 MA포장용 소재의 효과제고에 관한 연구(2))

  • Park, Hyung-Woo;Park, Jong-Dae;Kim, Byung-Sam;Kim, Hoon;Yang, Han-Chul
    • KOREAN JOURNAL OF PACKAGING SCIENCE & TECHNOLOGY
    • /
    • v.4 no.1
    • /
    • pp.17-21
    • /
    • 1997
  • Zeolite powder used by molecular sieve, adsorbants and catalist. 1N HCl teated zeolite powders for freshness extension of fruits and vegetables showed that specific surface area was $300.29m^2/g$ largest then that of the others, and ethylene gas adsorbability was 29.07 cc/g. And then 0.5N NaCl Henting after 1N HCl treated zeolite powder showed that specific surface area and ethylene gas adsorbability was $329.43m^2/g$ and 35.64 cc/g largest then those of the others. Specific surface area of processed zeolite powder treated by high intensity magnetic seperator(HIMS) showed $369.67m^2.g$, ethylene gas adsorbability was 39.87cc/g. In this study, it could be employ 0.5N NaCl treat and HIMS methods as MA packaging materials for freshess extension of fruits and vegetables.

  • PDF

Experimental Study on Physical Properties and Water Absorption Resistance Evaluation of Cement Mortar Incorporating Inorganic Metal Salt-based Water Repellent Powder (무기물 금속염계 발수분체를 혼입한 시멘트 모르타르의 물리적 특성 및 수분흡수저항성에 대한 실험적 연구)

  • Lee, Won Geun;Yoon, Chang Bok
    • Journal of the Korean Recycled Construction Resources Institute
    • /
    • v.9 no.4
    • /
    • pp.609-616
    • /
    • 2021
  • In this experimental, water-repellent powder, which is a metal salt-based inorganic substance, and natural zeolite powder, which is a pozzolan-based material, were mixed into cement mortar, and their physical properties and resistance to moisture were confirmed. It was confirmed that the test specimen using natural zeolite at the same time had excellent resistance in the water permeation test and the chloride penetration test as compared with the test specimen in which the inorganic metal salt-based water-repellent powder was mixed alone. When a metal salt-based water-repellent powder is used, it cannot be uniformly dispersed inside water due to its insoluble property, and is limited to the surface. When used at the same time as natural zeolite, the setting time at the initial stage of hydration is fast due to the pozzolan reaction, and the water-repellent powder adheres to the porous of the natural zeolite and is evenly distributed inside the test specimen to generate some water resistance.

The effect of seeding on crystal growth of NaX zeolite (NaX zeolite의 결정성장에서 seed 첨가에 따른 영향)

  • 하종필;김익진
    • Journal of the Korean Crystal Growth and Crystal Technology
    • /
    • v.9 no.1
    • /
    • pp.6-13
    • /
    • 1999
  • NaX zeolite crystal were grown from seed elements of synthetic NaX(2~3$\mu\textrm{m}$) Powder in a mother liquor having an approximate reactant composition ${4.12{Na}_{2}O{\cdot}{Al}_{2}{O}_{3}{\cdot}3.5{SiO}_{2}{\cdot}593{H}_{2}O$.The result was that crystallization time of NaX zeolite was reduced with adding seed materials to the initial mixture and crystal size was reduced . but with increasing crystallization time, NaX zeolite. In this study, We investigated detailed factors which NaX crystal has been determined by a combination of SEM, XRD, FT-IR, and BET.

  • PDF

Gas Permeability of Polyethylene Films Containing Zeolite Powder (제올라이트 입자를 첨가한 폴리에틸렌 필름의 기체 투과성)

  • Hwang Sun Woong;Chung Yong-Chan;Chun Byoung Chul;Lee Seong Jae
    • Polymer(Korea)
    • /
    • v.28 no.5
    • /
    • pp.374-381
    • /
    • 2004
  • Gas permeability of low density polyethylene (LDPE) film containing zeolite powder for $CO_2,\;O_2$ and $N_2$ were investigated. Zeolite powders modified by cations or surfactant were compounded with LDPE to produce $20 wt\%$ masterbatch. After blending the masterbatch with LDPE, zeolite filled films were prepared by the blown film process. Finally, the composite films containing zeolite loadings of 0, 3,5, and $10 wt\%$ were produced. A gas permeability apparatus based on the variable volume principle was designed to analyze the characteristics of films. Experiments showed a general trend that gas permeabilities first decreased and then increased as the zeolite content was increased. Surfactant modified zeolite showed a better interfacial adhesion with the matrix, but the film did not show a discernible difference in gas permeability compared with the other modified films. The difference of temperature dependences in the gas permeabilities of composite films was slightly smaller than that of LDPE film.

The Study on Inner Air Pollutants Absorptional Capability of Functional Mortar using Properties of Zeolite Powder (제올라이트계 분말을 이용한 기능성 모르터의 실내공기 오염물질 흡착 성능에 관한 연구)

  • Shin Yong-Jae;Heo Jae-Won;Kim Hyo-Youl;Lee Jong-Il;Lim Nam-Gi
    • Proceedings of the Korean Institute of Building Construction Conference
    • /
    • 2006.05a
    • /
    • pp.63-69
    • /
    • 2006
  • In a traditional society, building materials were developed fulfilling the requirements of conveniences and functionalities such as safety, construction work, durability and economical efficiency. However, as the concern about environmental or users' health issues has been elevated recently, research and development about eco-friendly material are alto vigorously promoted further In addition, thanks to the steady growth of domestic industry, the amount of discharged industrial by-product is getting increasing. However, its recycling rate remain at low level as most industrial by-products are filled up in the land, which worsen the environmental pollution. Zeolite powder is cement admixture and is expected to have constraining effect of factors causing symptoms of inhabitants in a new house and alleviates the amount of discharged harmful elements emitted from hardened cement.

  • PDF