ルテニウムもしくはルテニウム酸化物を含有する材料又はルテニウム含有の貴金属精鉱からのルテニウムの回収方法

Japanese Patent JP5376437

B2

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.

Horst myer
Matias grail
Christian Novotney
Martin Stettner
Joachim Clarik

JP2009017481A

December 25, 2013

January 29, 2009

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Heraeus Precious Metals GmbH & Co. KG

C22B11/00; C22B3/04; C22B3/44; C22B5/12; C22B7/00

JP62013540A
JP2004190133A
JP61006130A
JP59104438A
JP8199350A
JP11050163A
JP59145739A
JP57082125A
JP2004238735A
JP2009057611A

Einzel Felix-Reinhard
Takuya Kuno
Akashi Masatake

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