Liquid purification or separation – With alarm – indicator – register – recorder – signal or... – Responsive to fluid flow
Patent
1976-03-01
1977-06-07
Wyse, Thomas G.
Liquid purification or separation
With alarm, indicator, register, recorder, signal or...
Responsive to fluid flow
210 53, 423305, 423319, 423320, 423321R, C02B 120
Patent
active
040282376
ABSTRACT:
There are disclosed methods for removing fluorine values from fluorine-containing waste waters, in which aluminum ions are added to fluorine-containing waste water to convert fluorine to hydroxyfluoride complexes, adding phosphoric acid or phosphate and calcium compound are added to form fluoride apatite with residual fluorine in the waste water, and the hydroxy-fluoride complex and fluoride apatite are removed from the waste water.
When waste water containing a phosphate in addition to fluorine is treated, the waste water is divided, according to the fluorine concentration, into concentrated waste water having a high fluorine concentration and dilute waste water having a low fluorine concentration; calcium compound is added to the concentrated waste water to form calcium fluoride, aluminum ions are added to the dilute waste water to form a hydroxy-fluoride complex; the so treated dilute waste water is mixed with the phosphate-containing concentrated waste water from which the precipitated calcium fluoride has been removed, calcium compound is added to the mixture to form fluoride apatite, and the hydroxy-fluoride complex and fluoride apatite are removed from the mixed waste water.
REFERENCES:
patent: 3671189 (1972-06-01), Betts
patent: 3843767 (1974-10-01), Faust et al.
Chem. Abstract 82: 34776r; "Removal of Fluorine from Waste Waters." Line Addition and Effect of Aluminum Ions." Sekko To Sekkai (1974), 133, 216-221.
Chem. Abstract. 82: 102751f; "Physicochemical Purification of Water Containing Fluorine;" Trib. Cebedeau (1974); 27(371) 424-431.
Kikkawa Seiichi
Nishimura Shigeoki
Otani Kouji
Sawa Toshio
Castel Benoit
Hitachi , Ltd.
Wyse Thomas G.
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