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Scaling up Hydrothermal Synthesis of Na-A Type Zeolite from Natural Siliceous Mudstone and Its Heavy Metal Adsorption Behavior  

Bae, In-Kook (Korea Institute of Geoscience and Mineral Resources)
Jang, Young-Nam (Korea Institute of Geoscience and Mineral Resources)
Shin, Hee-Young (Korea Institute of Geoscience and Mineral Resources)
Chae, Soo-Chun (Korea Institute of Geoscience and Mineral Resources)
Ryu, Kyoung-Won (Korea Institute of Geoscience and Mineral Resources)
Publication Information
Journal of the Mineralogical Society of Korea / v.21, no.4, 2008 , pp. 341-347 More about this Journal
Abstract
The feasibility of commercializing the hydrothermal synthesis of Na-A type zeolite from siliceous mudstone has been conducted using a 50-liter bench-scale autoclave and the application of the zeolite as an environmental remediation agent. Siliceous mudstone, which is widely distributed around the Pohang area, was adopted as a precursor. The siliceous mudstone is favorable for the synthesis of zeolite because it contains 70.7% $SiO_2$ and 10.0% $Al_2O_3$, which are major ingredient of zeolite formation. The synthesis of zeolite was carried out under the following conditions that had been obtained from the previous laboratory-scale tests: 10hr reaction time, $80^{\circ}C$ reaction temperature, $Na_2O/SiO_2$ ratio = 0.6, $SiO_2/Al_2O_3$ ratio = 2.0 and $H_2O/Na_2O$ ratio= 98.6. The crystallinity and morphology of the zeolite formed were similar to those obtained from the laboratory-scale tests. The recovery and cation exchange ion capacity were 95% and 215 cmol/kg, respectively, which are slightly higher than those obtained in laboratory scale tests. To examine the feasibility of the zeolite as an environmental remediation agent, experiments for heavy metal adsorption to zeolite were conducted. Its removal efficiencies of heavy metals in simulated waste solutions decreased in the following sequences: Pb > Cd > Cu = Zn > Mn. In a solution of 1500 mg/L total impurity metals, the removal efficiencies for these impurity metals were near completion (> 99%) except for Mn whose efficiency was 98%. Therefore, the synthetic Na-A type zeolite was proven to be a strong absorbent effective for removing heavy metals.
Keywords
Na-A zeolite; bench scale; siliceous mudstone; simulated waste solutions; heavy metal removal efficiencies;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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1 Breck, D.W. (1975) Synthetic Zeolites: Properties and Applications. In : Lefond, S. J. (Ed.), Industrial Minerals and Rocks. Amer. Inst. Min. Metallur. Petrol. Engin., New York
2 Howell, P.A., Island, G., and Acara, N.A. (1964) USA Patent, 3,119,660
3 Tominaga, H. (1987) Sciences and applications of zeolite, Kodansha, 128 (in Japanese)
4 Barrer, R.M. (1948) Synthesis of zeolite mineral with chabazitelike sorptive properties. J. Chem. Soc., 127-132   DOI
5 Flanigen, E.M. (1991) Zeolites and Molecular Sieves: an Historical Perspective. Introduction to Zeolite Science and Practice, Vol. 58, Bekkum, H. van, Flanigen, E.M. and Jansen. J.C., New York: Elsevier
6 정필조, 김종혁, 김진태. (1990) 한국산 할로이사이트로부터 세제보조용 제올라이트 제조법. KR90-1488
7 노진환 (1994) 제3기 연일층군의 층서, 암상 및 속성광물상. 한국석유지질학회지, 2, 91-99
8 Milton, R.M. (1959) USA Patent 2,882,243
9 Breck, D.W. (1974) Zeolite molecular sieves: structure, chemistry, and use. Senior Research Fellow Union Carbide Corporation, New York, 313-320
10 심상권, 박진태, 김태삼 (2000) 제올라이트를 이용한 중금속 원소들의 흡착 특성. 13(1), 96-100
11 류완호, 이원묵, 홍필선, 양천희, 안재영, 백일현, 이병노 (2003) 석탄회를 이용한 제올라이트의 합성과 중금속 흡착특성, 화학공학, 41(5), 655-660
12 Costa, E., Lucas, A., Uguina, M.A., and RuizInd, J.C. (1988) Synthesis of 4A zeolite from calcined kaolins for use in detergents. Eng. Chem. Res., 27(7), 1291-1296   DOI   ScienceOn
13 Milton, R.M. (1968) Commercial development of molecular sieve technology, Molecular Sieves, Soc. Chem. Indus. London
14 배인국, 장영남, 채수천, 윤도우, 조성준, 이성기, 류경원 (2007) 자연산 규질이암을 이용한 Na-A형 제올라이트 수열합성. 한국시스템공학회지, 44(1), 61-70