Apparatus for removing heavy metals from aqueous liquids

Details Apparatus for removing heavy metals from aqueous liquids Apparatus for removing heavy metals from aqueous liquids

1981-04-16

1984-01-03

Wyse, Thomas G.

Liquid purification or separation

Recirculation

Serially connected distinct treating or storage units

210199, 210201, 422245, B01D 900

Patent

active

044241267

ABSTRACT:
Method and apparatus for removing heavy metals as sulfides from aqueous liquids. The aqueous liquid is introduced into a circulating liquid loop wherein there are established a mixing zone, a controlled precipitation initiating zone, a crystal growing zone and a crystal settling zone. The aqueous feed liquid containing H S dissolved therein and at a pH below that at which the sulfide is precipitated is mixed in the loop with a pH-adjusting liquid; and the degree of supersaturation with respect to the metal sulfide is maintained within the controlled precipitation initiating and crystal growing zones in the metastable condition so that the growth rate of the metal sulfide crystals remains greater than under uncontrolled conditions vis-a-vis the nucleation rate to effect the production of metal sulfide crystals of a character which makes it possible to separate them through clarification and filtration.

REFERENCES:
patent: 3119772 (1964-01-01), Hess et al.
patent: 4025430 (1977-05-01), Pagel
patent: 4218431 (1980-08-01), Spevack
patent: 4228089 (1980-10-01), Bischob et al.
patent: 4242177 (1980-12-01), Suzuki et al.

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