Multiple stage precipitation of heavy metals from acidic aqueous

Details Multiple stage precipitation of heavy metals from acidic aqueous Multiple stage precipitation of heavy metals from acidic aqueous

1995-05-26

1997-09-30

Popovics, Robert

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210724, 210726, 210743, 210912, 423104, 423140, B01D 2100

Patent

active

056722800

ABSTRACT:
For the removal of heavy metal contaminants from industrial waste water, a method is proposed for preparing a dense precipitate having superior handling and disposal properties. The method comprises incremental adjustment of the pH to maintain a low saturation ratio and recycling of slurry to provide seed crystals for secondary nucleation.

REFERENCES:
patent: 4278539 (1981-07-01), Santhanam et al.
patent: 4338200 (1982-07-01), Zeijlstra
patent: 5128047 (1992-07-01), Stewart et al.
patent: 5262063 (1993-11-01), Yen
Unit Operations of Chemical Engineering by Warren L. McCabe and Julian C. Smith, 1956, pp. 602-609.

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