METHOD FOR PRODUCING PARTICULATE RUTHENIUM

PWO 11 SSR/JBL/RKR/2016014999 Process for the production of particulate ruthenium 5 Process for the production of particulate ruthenium with a purity of ≥ 99.99 wt.% and a specific surface area of 0.2 to 0.5 m2/g, comprising the steps of: (1) providing a hydrochloric solution that was prepared by dissolving RuO4 in hydrochloric acid and has a content of ruthenium in the form of dissolved ruthenium 10 species in the range of 15 to 22 wt.%; (2) providing an aqueous solution with an ammonium chloride content in the range of 200 to 600 g/litre; 15 (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 to 6 mol ammonium chloride, at a temperature of 55 to 90°C over the course of 0.2 to 5 hours and while adjusting and maintaining a pH value in the range of -0.6 to 0; 20 (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 in the range of 350 to 1,000°C. 25 No Figure