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Method for the purification of metal-containing aqueous media and method of preparing an adsorbent

  • US 5,635,073 A
  • Filed: 04/12/1995
  • Issued: 06/03/1997
  • Est. Priority Date: 09/18/1992
  • Status: Expired due to Term
First Claim
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1. A method for the removal of dissolved heavy metal ions from a metal-containing aqueous medium wherein the aqueous medium is contacted with a particulate carrier material so as to form a metal-containing iron hydroxide coating on the carrier material particles and wherein the coated carrier material particles are separated from the aqueous medium, the method comprising the steps of:

  • (a) introducing a volume of carrier material particles into a reactor;

    (b) directing the metal-containing aqueous medium into the reactor in the presence of dissolved ferrous ions;

    (c) introducing an oxidant into the aqueous medium;

    (d) fluidising the carrier material particles in the reactor by passing the aqueous medium through the reactor at such a velocity and in such a direction as to fluidise the carrier material particles;

    (e) forming an iron oxyhydroxide coating on the carrier material particles by oxidizing the ferrous ions and hydrolyzing the resulting ferric ions;

    (f) adsorbing heavy metal ions onto outer surfaces of the carrier material particles; and

    (g) separating and removing the carrier material particles having the heavy metal ions adsorbed thereon from the aqueous medium.

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