- Co-Ru/Al2O3 PROCESS FOR THE COMPREHENSIVE RECOVERY OF METAL COBALT RUTHENIUM AND ALUMINUM FROM WASTE CATALYST Co-Ru/Al2O3 IN FISCHER-TROPSCH SYNTHESIS

摘要

A method for the overall recovery of metal cobalt, ruthenium, and aluminum from Co-Ru / Al ₂ O ₃ waste catalysts in a Fischer-Tropsch synthesis is provided. First, in order to effectively separate the cobalt slag in the alkali melting step, the waste catalyst is subjected to hydrocarbons removal and reduction treatment, and then the cobalt slag is subjected to an acid leaching step, a cobalt precipitation step with oxalic acid or ammonium oxalate, a reduction step with cobalt oxalate, And dissolving the metal cobalt with nitric acid or the like to obtain Co (NO ₃ ) ₂ .6H ₂ O. The ruthenate dissolved by the steps such as alkali melting and deionized water leaching is subjected to a reduction step with ethanol, a dissolution step with concentrated hydrochloric acid, a vacuum distillation step and the like to obtain a high purity β-RuCl ₃ .xH ₂ O product. Aluminum hydroxide was produced by CO ₂ carbonation from a meta-aluminate solution by controlling parameters such as the reaction temperature, the flow rate of CO ₂ , the pH value at the end of the reaction, and the aluminum hydroxide was calcined, To obtain aluminum oxide having a product quality meeting the quality requirements of aluminum oxide. The product obtained has a high yield, cobalt ≥97%, ruthenium ≥95%, and aluminum ≥92%.