Method for recovering ruthenium from spent ruthenium-based catalyst carried on aluminum oxide
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United States of America Patent
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Sep 12, 2017
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Sep 5, 2014
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Mar 5, 2012
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Abstract
A method for recovering ruthenium from a spent ruthenium-based catalyst carried on aluminum oxide includes: drying, calcining, and cooling a spent catalyst; grinding the spent catalyst into black powder; placing the black powder in a fluidized bed reactor, purging the reactor with hydrogen and heating the black powder to obtain ruthenium metal, then heating the black powder in a mixed atmosphere of oxygen and ozone to obtain RuO4 gas; absorbing the RuO4 gas with a sufficient amount of hydrochloric acid to obtain a H3RuCl6 solution; adding an excess oxidant to the H3RuCl6 solution to oxidize the H3RuCl6 into H2RuCl6; adding excess NH4Cl to the H2RuCl6 and then filtering, and washing the filter cake to obtain solid (NH4)2RuCl6; and reducing the solid (NH4)2RuCl6 by hydrogen to obtain ruthenium metal.
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