Treatment of liquids containing complexed heavy metals and...

Details Treatment of liquids containing complexed heavy metals and... Treatment of liquids containing complexed heavy metals and...

C - Chemistry, Metallurgy

23

C

362/31, 6/4

C23C 18/16 (2006.01) B01J 45/00 (2006.01) C22B 3/28 (2006.01)

Patent

CA 1082376

Abstract of the Disclosure. - Methods are provided for separating by-products from alkanolamine complexing agents and heavy metals complexed with alkanolamines, and for the waste-treating of solutions containing such complexed heavy metals and complexing agents. Illustratively, the pH of an electroless metal deposition bath or bath effluent which con- tains an alkanolamine complexing agent and an alkanolamine- complexed heavy metal is adjusted to render the complexing agent and complexed heavy metal extractable by an ion exchange medium, the pH-adjusted bath liquid is contacted with an ion- exchange medium capable of extracting the complexed heavy metal and complexing agent, the contacted bath liquid, which contains by-products and is substantially free of the complexed heavy metal and the complexing agent is removed from the ion exchange medium and the complexed heavy metal and complexing agent are recovered from the exchange medium for further use in electro- less metal deposition baths.

282312

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