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
Issued Date -
N/A
app pub date -
Sep 5, 2014
filing date -
Mar 5, 2012
priority date (Note) -
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status (Latency Note)
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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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International Classification(s)
- 2014 Application Filing Year
- C22B Class
- 297 Applications Filed
- 251 Patents Issued To-Date
- 84.52 % Issued To-Date
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- C22B Class
- 0 % this patent is cited more than
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