METHOD FOR PRODUCING SOLID RUTHENIUM NITROSYL NITRATE USING SPENT CATALYST CONTAINING RUTHENIUM Russian patent published in 2016 - IPC C01G55/00 B09B3/00 

FIELD: metallurgy.

SUBSTANCE: invention relates to platinum group metal recycling method. Obtaining of solid ruthenium nitrosilnitrate includes several stages. Drying, calcination for 2-4 hours at temperature of 300-500 °C of used catalyst containing ruthenium is performed, and cooling down to room temperature to produce black solid product. Solid product is milled to produce powder. Powder is introduced into fluid-bed reactor. Reactor aeration with nitrogen or inert gas for 0.5-2 hours, introduction of hydrogen and heating reactor to temperature of 100-600 °C is performed to carry out reduction reaction with formation of metallic ruthenium. Ruthenium metal oxidation is carried out with gaseous mixture of ozone and air at temperature of 600-650 °C to produce gaseous ruthenium tetroxide. Ruthenium tetroxide is introduced in three-stage absorption installation containing solution of nitric acid. Ruthenium nitrate acid solution is formed. Solution is added with sodium nitrite, mixed and heated with reflux condenser with microboiling. Ruthenium nitrosilnitrate solution is formed. Ruthenium nitrosilnitrate solution extraction using anhydrous ether, collecting and evaporation of extraction solution are performed. Solid ruthenium nitrosilnitrate is formed.

EFFECT: efficient recycling of ruthenium resources, high output and purity of solid ruthenium nitrosilnitrate is ensured.

10 cl, 1 dwg