Heraeus Deutschland Gmbh & Co Kg

Heraeus Precious Metals North America LLC

Christoph Röhlich

Holger Winkler

Steffen Voss

Vasco Thiel

Brian Peters

Felix Stoffner

Stefanie Fuchs Alameda

Jimmy Taylor

Todd England

Hermann Von Eiff

Diana Caroline Vieten

Marco Stemmler

Christian Kraushaar

Jan Roder

Norbert Ritschel

Karl Bernhard Friedrich

Bernhard Bauer-siebenlist

Jan RÖDER

Jan Schapp

A method for producing a collector alloy comprising 25 to 100 wt % precious metal in total, comprising 0 to <97 wt % of the precious metal silver, 0 to 75 wt % of at least one precious metal selected from gold, platinum, rhodium and palladium, and 0 to 75 wt % of at least one non-precious metal selected from copper, iron, tin and nickel, or for producing pure silver, comprising the steps of:

Method for the production of a collector alloy comprising precious metal or of pure silver

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 production of a PGM (platinum group metal)-enriched alloy containing iron and PGM(s) (platinum, palladium and/or rhodium) includes steps of: (1) providing a sulfur-free PGM collector alloy, (2) providing a copper- and sulfur-free material capable of forming a molten slag-type composition including silicon dioxide and magnesium and/or calcium oxide, (3) melting the PGM collector alloy and slag-forming material within a converter until a multi-phase system of a lower high-density molten mass of PGM collector alloy and an upper low-density molten mass of slag-type composition has formed, (4) contacting an oxidizing gas with the lower high-density molten mass of step (3) until conversion of the PGM collector alloy into a PGM-enriched alloy, (5) separating an upper molten slag formed in step (4) from the PGM-enriched alloy by difference in density, (6) allowing the separated molten masses to cool down and solidify, and (7) collecting the solidified PGM-enriched alloy.

Process for the production of a PGM-enriched alloy

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Hanau, Germany

Christoph Röhlich