Heavy metal adsorbent process

Details Heavy metal adsorbent process Heavy metal adsorbent process

1974-11-20

1976-07-20

Hart, Charles N.

Liquid purification or separation

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

Responsive to fluid flow

210 38B, B01D 1500, C02B 152

Patent

active

039705536

ABSTRACT:
A process for removing heavy metal ions from aqueous solutions with an adbent comprising granules of a mixture of nitrohumic acid and at least one binder selected from the group consisting of a carboxyl group-containing polymeric compound and a water-insoluble salt thereof. These heavy metal adsorbents are produced advantageously by either a process wherein a mixture of nitrohumic acid and a carboxyl group-containing polymeric compound is kneaded with an aqueous solution of alkali and the kneaded mixture is first subjected to an acid treatment and then shaped into granules, or a process wherein nitrohumic acid and a carboxyl group-containing polymeric compound are dissolved in an aqueous solution of alkali, the solution is acidified to form a precipitate and then the precipitate is separated and shaped into granules. The granular products thus obtained can be further improved in mechanical strength by means of a heat treatment.

REFERENCES:
patent: 2815329 (1957-12-01), Germain
patent: 3725291 (1973-04-01), Serbus et al.
patent: 3755161 (1973-08-01), Yokota et al.

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