Method of extracting heavy metals from industrial waste waters

Details Method of extracting heavy metals from industrial waste waters Method of extracting heavy metals from industrial waste waters

1973-12-17

1976-01-06

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

75109, 210 52, C02B 120

Patent

active

039310078

ABSTRACT:
A method is provided for extracting metal impurities from waste water to which ferrous ions are added to provide at least two times the amount of ferrous ions on the mol basis to the amount of metal ions present, the resulting solution containing acid radicals, a base being added to the solution to raise the pH to form a suspension of metal hydroxides, following which an oxidizing gas is bubbled in solution to form crystals containing ferric ions and further containing the metal ions originally in solution, the precipitated crystals being thereafter separated to provide clean water.

REFERENCES:
patent: 2232295 (1941-02-01), Urbain et al.
patent: 3347787 (1967-10-01), Rhodes
patent: 3575854 (1971-04-01), Richards
patent: 3617559 (1971-11-01), Cywin

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