Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
1978-09-08
1981-07-14
Wyse, Thomas G.
Liquid purification or separation
Processes
Making an insoluble substance or accreting suspended...
210726, 423 48, 423101, C02B 126, C02C 502
Patent
active
042785391
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.sub.2 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: 3740331 (1973-06-01), Anderson et al.
patent: 3872222 (1975-03-01), Barnes
patent: 3980752 (1978-09-01), Fekete et al.
patent: 4073860 (1978-02-01), Huggins et al.
patent: 4102784 (1978-07-01), Schlauch
Nadkarni Ravindra M.
Santhanam Chakra J.
Arthur D. Little Inc.
Wyse Thomas G.
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