US 10,301,180 B2 · Activated carbon regeneration method and gold recovery method

Abstract

An activated carbon regeneration method of the present invention is for eluting gold from activated carbon on which the gold has been adsorbed and thereafter recycling, in adsorption of the gold, the used activated carbon from which the gold has been eluted, the method including: washing the used activated carbon with an acidic washing liquid, alkaline washing liquid or neutral washing liquid; and when the used activated carbon is washed with the acidic washing liquid, keeping the acidic washing liquid after the washing in an acidic region, or when the used activated carbon is washed with the alkaline washing liquid or neutral washing liquid, keeping the alkaline washing liquid or neutral washing liquid after the washing in an alkaline region or neutral region.

Claims7

Dependent claims

A method for regenerating used activated carbon from which gold has been eluted, the method comprising:

after eluting the gold from the activated carbon thus providing the used activated carbon;
washing the used activated carbon with an acidic washing liquid or alkaline washing liquid;
and
when the used activated carbon is washed with the acidic washing liquid, keeping a pH of the acidic washing liquid after the washing at 2.7 or lower, or when the used activated carbon is washed with an alkaline washing liquid, keeping a pH of the alkaline washing liquid after the washing at 8 or more, wherein an aqueous caustic soda solution is used as the alkaline washing liquid and a molar concentration of the aqueous caustic soda solution is 0.1 mol/L to 2.0 mol/L.

1 more element

Dependencies are inferred from the claim text.

Activated carbon regeneration method and gold recovery method

Life of this patent

Activated carbon regeneration method and gold recovery method

Life of this patent

Abstract

Claims7