Method for generating ruthenium from materials or noble metal ore concentrates containing ruthenium or ruthenium oxide

摘要

Recovery (M1) of ruthenium from materials containing ruthenium or ruthenium oxides or from ruthenium-containing noble metal ore concentrates involves introducing the material into an alkali hydroxide melt in the presence of nitrate as oxidizing agent and forming an oxidized melt residue with water-soluble ruthenate; subjecting the oxidized melt residue to dissolution in water; adding a reducing agent; and precipitating the metals formed. Recovery (M1) of ruthenium from materials containing ruthenium or ruthenium oxides or from ruthenium-containing noble metal ore concentrates involves either: introducing the material into an alkali hydroxide melt in the presence of nitrate as oxidizing agent and forming an oxidized melt residue with water-soluble ruthenate; subjecting the oxidized melt residue to dissolution in water; adding a reducing agent; and precipitating the metals formed; or introducing the material into an alkali hydroxide melt in the presence of nitrate as oxidizing agent to form water-soluble ruthenate; subjecting the oxidized melt residue to dissolution in water to obtain a ruthenate solution; treating the ruthenate-containing solution with an oxidizing agent; distilling off of the ruthenate obtained; and absorbing the ruthenate in hydrochloric acid. An independent claim is included for separation (M2) of selenium from materials containing ruthenium or ruthenium oxides or from ruthenium-containing noble metal ore concentrates involving: introducing the material into the alkali hydroxide melt in the presence of nitrate as oxidizing agent and forming the oxidized melt residue with water-soluble ruthenate; subjecting the oxidized melt residue to dissolution in water, where the solution subsequently contains ruthenate and selenate; adding the reducing agent; precipitating water-containing ruthenium(IV) oxide, where the selenium is dissolved quantitatively in second step as selenate.