Method of removing heavy metals from solutions of amino-carboxyl

Details Method of removing heavy metals from solutions of amino-carboxyl Method of removing heavy metals from solutions of amino-carboxyl

1994-09-08

1995-10-31

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210912, C02F 162

Patent

active

054626714

ABSTRACT:
Disclosed is a method to remove heavy metals from amino-carboxylic acid chelate solutions comprising adding nitrous acid to lower the pH of the aqueous solution sufficient to destroy the chelate bonds and release the metal ions and thereafter adding an appropriate strong base and optionally a sulfide salt to precipitate the liberated heavy metals.

REFERENCES:
patent: 4675111 (1987-06-01), Newton et al.
patent: 5122268 (1992-06-01), Burack et al.
patent: 5178772 (1993-01-01), Daley et al.

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