Process for the enrichment of silver or other valuable metals by flotation from a suspension, for example from the residues of zinc leaching

摘要

The invention relates to a method for enriching silver or other precious metals by means of flotation from a suspension, for example from zinc-leaching residues, a metal comprising the following steps: a metal which is baser than hydrogen is added; an acid up to a pH value of 2.0 to 5.0 is added, especially 3.5 to 4.5; an organic additive in a concentration of 50 ppm to 1000 ppm is added; the mixture is contacted; and the mixture is fed into a flotation device for separating off the part containing the precious metal. The method ensures good enrichment with an equally good yield of the valuable substance desired.