METHOD FOR SEPARATING MULTIVALENT METAL IONS
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United States of America Patent
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app pub date -
Jan 21, 2009
filing date -
Aug 28, 2000
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Abandoned
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Abstract
A method and apparatus are described for removing iron cations and/or zinc cations from an autodeposition coating bath by passing a limited number of bed volumes through a column containing a gel type SAC IEX resin when iron cations are to be removed and passing a substantially larger number of bed volumes through the column when zinc cations are to be removed. To prevent clogging when zinc cations are being removed the direction of the flow through the column is periodically reversed.
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