Treatment of metal plating wastes with an unexpanded vermiculite

Details Treatment of metal plating wastes with an unexpanded vermiculite Treatment of metal plating wastes with an unexpanded vermiculite

1979-02-22

1980-07-01

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

210 71, 423 24, 423100, 423139, 252378R, C02B 144

Patent

active

042105307

ABSTRACT:
Multivalent heavy metal ions are removed from metal plating waste streams by passing them through an unexpanded vermiculite cation exchange column. The column is effective to remove copper, zinc, and nickel ions and mixtures thereof. Where cyanide and cyanide-metal complexes are also present in the plating waste stream, the stream is pretreated to destroy the cyanide and cyanide complexes prior to passage through the ion exchange column.

REFERENCES:
patent: 3382034 (1968-05-01), Kraus
patent: 3617567 (1971-11-01), Mathre
patent: 3617582 (1971-11-01), Lawes et al.
patent: 3658470 (1972-04-01), Zievers et al.
patent: 3758415 (1973-09-01), Wada
patent: 4100065 (1978-07-01), Etzel

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