METHOD FOR EXTRACTION RUTHENIUM FROM SPENT CATALYST IN FORM OF ALUMINIUM OXIDE LOADED WITH RUTHENIUM Russian patent published in 2016 - IPC C22B7/00 C22B23/00 C22B21/00 C22B11/00 

FIELD: chemistry.

SUBSTANCE: invention relates to extraction of ruthenium from spent catalyst in form of aluminium oxide, containing ruthenium. Method involves drying, calcining, cooling and milling into black powder containing ruthenium oxide. Putting it into a fluidised bed reactor, introduction of hydrogen for reduction of obtained powder comprising metallic ruthenium. Further, into reactor with recovered powder is introduced a gaseous mixture of oxygen and ozone, thereby obtaining gaseous RuO₄. Further RuO₄ is introduced into hydrochloric acid solution to obtain a solution of H₃RuCl_6, followed by adding excess oxidant to form hexachlororuthenic (IV) acid. Further, excess NH₄Cl is added to obtain a solid product of ammonium hexachlororuthenate (IV). Further, said product is reduced and ruthenium metal is obtained.

EFFECT: high degree of extraction of ruthenium, simplified process.

9 cl, 4 ex