Heraeus Deutschland Gmbh & Co Kg

Vasco Thiel

Martin Stettner

Stefanie Fuchs Alameda

Steffen Voss

Christoph Röhlich

Jan Schapp

Hermann Von Eiff

Magdalena Günther

Marco Stemmler

Christian Kraushaar

Steffen Voß

Jan Roder

Christoph Roehlich

Stefanie Fuchs-Alameda

Steffen Voβ

Magdalena Gunther

Jan RÖDER

Process for the production of particulate ruthenium with a purity of &#x2264;99.99 wt. % and a specific surface area of 0.2-0.5 m/g, comprising: (1) providing a hydrochloric solution prepared by dissolving RuOin hydrochloric acid and has a content of ruthenium in the form of dissolved ruthenium species of 15-22 wt. %; (2) providing an aqueous solution with an ammonium chloride content of 200-600 g/litre; (3) forming a reaction mixture by dosing the hydrochloric solution provided in step (1) to the aqueous solution provided in step (2) at a molar ratio of 1 mol ruthenium: 3-6 mol ammonium chloride, at a temperature of 55-90&#xb0; C. over the course of 0.2-5 hours and while adjusting and maintaining a pH of &#x2212;0.6 to 0; (4) separating solid material formed during step (3) from the hydrochloric reaction mixture; and (5) calcinating the solid material separated in step (4) at an object temperature of 350-1,000&#xb0; C.

Process for production of particulate ruthenium

A process for digestion of fine iridium includes (a) alkaline oxidative digestion of 1 part by weight fine iridium and 3 to 20 parts by weight of a combination comprising 40 to 70 parts by weight sodium hydroxide, 15 to 30 parts by weight sodium nitrate, and 10 to 40 parts by weight sodium peroxide in the melt, whereby the sum of the weight fractions equals 100 parts by weight; (b) cooling the digestion material formed in step (a) to 20 to 70&#xb0; C.; (c) dissolving the acid-soluble fractions of the cooled digestion material in water/halogen hydracid until an acidic aqueous solution with a pH value of &#x2212;1 to +1 is obtained; and (d) boiling the acidic aqueous solution obtained in step (c) until the formation of nitrous gases is completed. Insoluble ingredients can be separated from the acidic aqueous solution before or after step (d), if needed.

Process for digestion of a metallic iridium- and/or iridium oxide-comprising mixture of solid particles

Process for removing precious metal from precious metal-containing catalyst form bodies comprising form bodies and precious metal, whereby the precious metal to be removed is at least one precious metal selected from the group consisting of Au, Ag, Pd, Pt, Ir, Rh, Ru, Os, and Re, comprising the steps of: (a) producing a mixture of precious metal-containing catalyst form bodies in at least one mineral acid that is at least 1N; (b) supplying inert or oxidizing gas into the mixture containing noble metal-containing catalyst form bodies and mineral acid; (c) introducing at least one oxidation agent, in solid or liquid form, into the mixture containing noble metal-containing catalyst form body and mineral acid; and (d) separating the form bodies from the liquid.

Process for removing precious metal from precious metal-containing catalyst form bodies

Method for producing elemental rhodium, comprising the steps of:

Method for producing elemental rhodium

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Alzenau, Germany

Vasco Thiel