Process for the removal of metals, in particular heavy metals, f

Details Process for the removal of metals, in particular heavy metals, f Process for the removal of metals, in particular heavy metals, f

1988-02-04

1989-08-29

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210912, 210914, 4235611, 4235661, C02F 152

Patent

active

048614939

ABSTRACT:
Process for the removal of metals, in particular heavy metals and strontium, from waste water in the form of their sulfide by mixing the waste water with a water soluble sulfide. According to the invention the metal containing waste water is thoroughly mixed with the water soluble sulfide at a suitable pH in a reactor of the fluidized bed type, which is provided with an appropriate bed material, on which the metal sulfide crystallizes out, whereby the thus obtained bed material provided with crystalline metal sulfide is removed from and new bed material is added to the reactor from time to time. Usually as water soluble sulfide an alkali metal sulfide or alkali metal hydrogen sulfide or ammonium sulfide or FeS is used, whereas the use of sodium sulfide, sodium hydrogen sulfide, potassium sulfide or potassium hydrogen sulfide is preferred. According to the present process a.o. the following metals: Ni, Sr, Zn, Cu, Fe, Ag, Pb, Cd, Hg, Co, Mn, Te, Sn, In, Bi or Sb may be removed.

REFERENCES:
patent: 3579443 (1971-05-01), Horst
patent: 3654428 (1972-07-01), Dean et al.
patent: 3740331 (1973-06-01), Anderson et al.
patent: 3869381 (1975-03-01), Graveland et al.
patent: 4046683 (1977-09-01), Tsunoda et al.
patent: 4102784 (1978-07-01), Schlauch
patent: 4278539 (1981-07-01), Santhanam et al.
patent: 4432880 (1984-02-01), Talbot
patent: 4764284 (1988-08-01), Jansen

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