Patent ID: 9617621
Date: 2017-04-11
CPC Classifications: C22B,Y02P

Claim:
1. A method for treating an acidic solution containing zinc sulphate in order to separate at least one metal or compounds of them in solution from the acidic solution containing zinc sulphate, whereby the metal to be separated is one of the group of indium, gallium and germanium, wherein the acidic solution containing zinc sulphate is neutralised in a pre-neutralisation stage to a pH value of 2.5-3.5 and wherein a precipitate formed in the pre-neutralisation stage is separated from the acidic solution containing zinc sulphate by solids-liquid separation and a precipitate obtained from the solids-liquid separation is subjected to a precipitate scrubbing and leaching stage and at least one of the group of metals or compounds of them to be separated is separated from the acidic solution containing zinc sulphate obtained from the solids-liquid separation in a cementation stage by means of zinc powder.