Method for recovering ruthenium from ruthenium-supported alumina waste catalyst

摘要

PROBLEM TO BE SOLVED: To provide a method for recovering ruthenium from ruthenium-supported alumina waste catalyst. SOLUTION: A step of drying, calcination and cooling of a ruthenium-supported alumina waste catalyst, a step of pulverizing into ruthenium oxide-containing black powder, a black powder is placed in a fluidized bed reactor, and hydrogen is added to perform a reduction reaction to form a metal. The step of obtaining Ru, the step of obtaining RuO4 gas by oxidizing a waste catalyst by putting a mixed gas of oxygen and ozone into a fluidized bed reactor, and the RuO4 gas being dissolved in a sufficient hydrochloric acid solution by dissolving RuO4 gas To obtain H3RuCl6 solution by adding excess oxidizing agent to H3RuCl6 solution to completely oxidize H3RuCl6 to obtain hexachloro (IV) ruthenic acid, adding excess NH4Cl, reacting, filtering, filter cake The step of obtaining solid ammonium hexachloro (IV) ruthenate by washing, and finally hydrogen reduction treatment of solid ammonium hexachloro (IV) ruthenate. It comprises obtaining a ruthenium metal. The method is simple in operation, inexpensive, has a short recovery period, and has a high recovery rate.