Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
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
Kanamori Masaru
Sugano Izuru
Tsuji Toshiro
Hart Charles N.
Hruskoci Peter A.
Nippon Electric Company Limited
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