Method of processing spent electroless bath and bath for use the

Details Method of processing spent electroless bath and bath for use the Method of processing spent electroless bath and bath for use the

1989-02-01

1990-09-04

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210725, 210727, 210729, 210737, 210912, 75429, 75430, 423 43, 423140, B01D 2101, C02F 154

Patent

active

049542656

ABSTRACT:
A method of processing an aqueous feed liquid to precipitate at least one metal (e.g., copper, nickel or a combination thereof) in a form to make the metal subsequently removable from the feed liquid by filtration, comprises the initial step of mixing (i) an aqueous feed liquid containing a soluble salt of the metal to be removed, (ii) oxalic acid in excess of that required to react with metal, and (iii) a pH-adjusting liquid in a quantity sufficient to lower the pH of the feed liquid to a point between that at which the feed liquid becomes slightly supersaturated with respect to the oxalate of the metal and that at which precipitation of the metal oxalate is initiated. The mixture is then allowed to stand (either at room temperature or heated to elevated temperatures) for a period of time sufficient to form metal oxalate, and finally the formed metal oxalate is separated from the feed liquid to leave an aqueous liquid suitable for discharge to a sewer line.

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The Occidental Chemical Corp. reprint, "Dealing with Spent Electroless Nickel" and Products Finishing article, Plate-Out Pollution Control and Products Finishing articles Landban and Land-Ban Confrontation.

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