Method for removing of multivalent heavy metals from metal plati

Details Method for removing of multivalent heavy metals from metal plati Method for removing of multivalent heavy metals from metal plati

1976-12-22

1978-07-11

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

C02B 144

Patent

active

041000650

ABSTRACT:
An exfoliated vermiculite cation-exchange column is used to remove multivalent heavy metals (copper, zinc, nickel, chromium, etc.) from metal plating wastes. The exfoliated vermiculite may be either chemically or relatively low-temperature thermally expanded vermiculite ore. It preferably has a cation exchange capacity of over 80 meq/100g. Exfoliated vermiculite particle sizes of less than approximately 10 mesh are preferred as the column packing. The ion-depleted vermiculite from the exchange column after use can be further expanded thermally and used as a lightweight filling material.

REFERENCES:
patent: 3382034 (1968-05-01), Kraus
patent: 3658470 (1972-04-01), Zievers et al.
patent: 3758415 (1973-09-01), Wada

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