Condensation of metal vapors in a fluidized bed and apparatus
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United States of America Patent
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Oct 25, 1994
Grant Date -
N/A
app pub date -
Jun 29, 1991
filing date -
Nov 8, 1989
priority date (Note) -
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Abstract
Metal vapor, for example zinc fume in the offgas of a smelting furnace, is captured by bringing the stream into direct contact with a fluidized bed of solid particles having a particulate loading of greater than 10 kg/m.sup.3 and preferably greater than 400 kg/m.sup.3. The thermal mass and temperature of the bed is such as to rapidly quench the vapor in the case of zinc from above 960.degree. C. to below 419.degree. C. in less than 100 milliseconds, whereby the vapor condenses in the bed and is recovered as zinc metal in acceptable yield.
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