Abstract: For processing of noble metal-containing, moist recycling materials with an unknown noble metal content (hereinafter called “batch”), a moisture-binding agent is added for homogenisation and the batch is mixed with comminution of optionally pre-sent agglomerates to form a free-flowing and homogenous powder. Optionally, the following takes place subsequently for analysis: A at least one representative, volume-reduced sample is taken first of all, B the sample is dried, C the sample is optionally divided further and D the sample is analyzed and the noble metal content of the batch is calculated on the basis of the data a previously known or pre-calculated quantity of the moisture-binding agent being added before sampling (step A).

Abstract: A method for dissolving noble metals out of segregated ores containing noble metals, comprising: reducing noble metal oxides present to the individual metals in finely divided form; oxidating the segregated ores and/or the noble metals with HCl and chlorate to yield a solution or suspension having a concentration of H+ ions of at least 1 mol/l, a concentration of Cl− ions of at least 1 mol/l and a temperature of at least 50° C.

Abstract: A method is proposed for producing gold of high purity from noble metal solutions containing nitrate, with the following steps: a) Nitrate destruction in the noble metal solution, b) Addition of a gold ion reducing acid Fe2+ solution whose H+ ion concentration amounts to at least 4 mol/l, to the solution prepared in step a), whose H+ ion concentration amounts to at least 4 mol/l.

Abstract: A method is described for the preparation of platinum wherein first an aqueous solution of a hexahalogenoplatinate is passed through a cation exchanger and then the solution obtained, at a temperature T>+30° C. and a pH of 0 to 4, is reduced by a reducing agent to precipitate in the form of a platinum sponge.