Ferrous dithionite process and compositions for removing dissolv

Details Ferrous dithionite process and compositions for removing dissolv Ferrous dithionite process and compositions for removing dissolv

1991-04-08

1992-06-16

Silverman, Stanley S.

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210719, 210724, 210757, 210912, 423515, 75721, 75725, 75726, 75739, 75740, 75741, C02F 162, C02F 170

Patent

active

051222795

ABSTRACT:
Heavy metal ions react with ferrous dithionite in acidic aqueous solution. They are reduced to metallic particles that are suitable for recycling and reuse when recovered from the acidic water. When chelating agents are present, they are deactivated by bonding to the ferrous ions. Ferrous dithionite, (FeS.sub.2 O.sub.4) is either generated in-situ or ferrous ions and dithionite ions can be provided by other methods.

REFERENCES:
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patent: 4076795 (1978-02-01), Tiethof
patent: 4157980 (1979-06-01), Tiethof
patent: 4599177 (1986-07-01), Hayashi et al.
patent: 4698162 (1987-10-01), Guilbault et al.
patent: 4859447 (1989-08-01), Sanglet

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