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Capture of Volatile Hazardous Metals Using a Bed of Kaolinite
1Nuclear Fuel Cycle R & D Group, KAERI, Taejon, Korea 2Department of Chemical Engineering, Chungnam National Univ., Taejon, Korea 3, Korea
Korean Journal of Chemical Engineering, September 1999, 16(5), 646-653(8), 10.1007/BF02708146
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Abstract
One of the promising technologies for reducing metals emission from the waste thermal process is the capture of vapor-phase metals through the use of solid sorbents. This study investigated the use of natural kaolinite for the removal of several volatile metals. The capture of cadmium and lead using a packed bed with porous kaolinite of the size range 300-400 ㎛ was effective. The capturing efficiency increased as the bed temperature increased. The ratio of the sorption reaction rate to the diffusion rate varied on the 10-2 order of magnitude. This suggests that the resistance of the diffusion within the pores of kaolinite particles is not significant in the selection of sorbent particle size for practice. The capturing mechanism for cadmium chloride is different from that for lead chloride. Cadmium can be reactively scavenged by CdO·Al2O3·2SiO2 as well as metakaolinite, suggesting that a unit mole of metakaolinite can ultimately capture two moles of cadmium.
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References
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Ho TC, Tan L, Chen C, Hopper JR, AIChE Symp. Ser., 87, 118 (1991)
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Mahuli S, Agnihotri R, Chauk S, Ghosh-Dastidar A, Fan LS, Environ. Sci. Technol., 31, 3226 (1997)
Moon SK, Sung WY, Korean J. Chem. Eng., 2(1), 45 (1985)
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Park HC, Moon H, Korean J. Chem. Eng., 1(2), 165 (1984)
Perry RH, Green D, "Perry's Chemical Engineers, Handbook," McGraw-Hill, Inc., 6(3), 285 (1984)
Satterfield CN, "Heterofeneous Catalysis in Industrial Practice," McGraw-Hill, Inc., 2, 471 (1993)
Scotto MA, Peterson TW, Wendt JOL, "Hazardous Waste Incineration: in Situ Capture of Lead by Sorbent in a Laboratory Down-Flow Combustor," 24th International Symposium on Combustion, The Combustion Institute, Pittsburgh, 1109 (1992)
Sherwood TK, Pigford RL, Wilke CR, "Mass Transfer," MaGraw-Hill Chemical Engineering Series, 319 (1975)
U.S. DOE, "Simultaneous High-Temperature Removal of Alkali and Particulates in a Pressurized Gasification System," FE-3245-9, 115 (1978)
Uberoi M, Shadman F, AIChE J., 36, 306 (1990)
Uberoi M, Punjak WA, Shadman F, AIChE J., 35, 1186 (1989)
Uberoi M, Punjak WA, Shadman F, Prog. Energy Combust. Sci., 16, 205 (1990)
Uberoi M, Shadman F, Environ. Sci. Technol., 25, 1285 (1991)
U.S. EPA, "Operational Parameters for Hazardous Waste Combustion Devices," EPA/625/R-93/008, 62-63 (1993)
Vidic RD, "Removal of Mercury from the Stack Gases by Active Carbon," 21th Annual RREL Research Symposium, EPA/600/R-95/012, 103 (1995)
Wouterlood HJ, Bowling KM, Am. Chem. Soc., 13, 93 (1979)
Wu B, Jaanu KK, Shadman F, Environ. Sci. Technol., 29, 1660 (1995)
Yang HC, Kim JH, Oh WJ, Park HS, Seo YC, Environ. Eng. Sci., 15, 299 (1998)
Yang HC, Kim JH, Seo YC, Kang Y, Korean J. Chem. Eng., 13(3), 261 (1996)
Yang HC, Seo YC, Kim JH, Park HH, Kang Y, Korean J. Chem. Eng., 11(4), 232 (1994)
