Recovery of V W and Ti components from waste de-Nox catalyst

摘要

PURPOSE: A process for effectively separating and recovering metal components such as titanium, vanadium and tungsten from waste De-NOx catalyst comprising titanium, vanadium and tungsten as principal components is provided. CONSTITUTION: The method comprises a step of selectively eluting vanadium only in an aqueous solution phase by applying 50 to 200 ml of at least one acid solution selected from hydrochloric acid solution, nitric acid solution, sulfuric acid solution, phosphoric acid solution, citric acid solution and acetic acid solution to 100 weight parts of waste De-NOx catalyst containing 70 to 90 wt.% of TiO2, 1 to 10 wt.% of V2O5 and 10 to 20 wt.% of WO3, and separating vanadium from tungsten and titanium through the filtering process; a step of selectively eluting tungsten only in an aqueous solution phase by applying 50 to 200 ml of at least one alkali solution selected from NaOH, KOH and NH4OH solutions to 100 weight parts of residue containing tungsten and titanium separated through the filtering process, and separating tungsten from titanium oxide through the filtering process; and a step of recovering titanium in solid phase by washing and drying the titanium oxide.