Process for the precipitation of heavy metal ion-polycarboxylate

Details Process for the precipitation of heavy metal ion-polycarboxylate Process for the precipitation of heavy metal ion-polycarboxylate

1974-11-11

1976-05-11

Hart, Charles N.

Liquid purification or separation

With alarm, indicator, register, recorder, signal or...

Responsive to fluid flow

134 13, 210 58, 210DIG25, C02B 120

Patent

active

039561216

ABSTRACT:
A process for precipitating heavy metal ion-polycarboxylate complexes from solution, said process comprising adding to a solution containing at least one of said complexes an aqueous solution of a water soluble aluminum salt, the anion of which does not form any water soluble complexes with said heavy metal ions to be precipitated or optionally such anion-heavy metal complexes having a stability constant, expressed as their decadic logarithm, of less than 2; wherein 0.9 to 1.8 moles of aluminum ions are employed per equivalent of polycarboxylate; and adjusting the pH of the resulting reaction mixture to about 6.5 to about 9.0 with an alkali metal carbonate.

REFERENCES:
patent: 3033214 (1962-05-01), Bersworth et al.
patent: 3409415 (1968-11-01), Moore
patent: 3682701 (1972-08-01), Lancy
patent: 3686145 (1972-08-01), Haschke et al.

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