A method for leaching separation of vanadium, molybdenum, nickel and aluminum from deoiled spent catalyst

Abstract

The application discloses a method for leaching and separating vanadium, molybdenum, nickel and aluminum from a deoiled waste catalyst, which comprises the following steps: grinding the deoiled waste catalyst, adding the deoiled waste catalyst into water and stirring to obtain a slurry; slowly adding peroxymonosulfuric acid into the slurry under stirring to react and filter, so as to obtain a first filtrate and a first leaching residue; washing and drying the first leaching residue to obtain dried first leaching residue, and mixing the washing liquid with the first filtrate to obtain a first leaching liquid; soaking the dried first leaching residue in a sodium hydroxide solution, filtering to obtain a second filtrate and a second leaching residue, washing the second leaching residue, and mixing the washing liquid with the second filtrate to obtain a second leaching liquid; the strong oxidizing property of the peroxymonosulfuric acid is utilized to oxidize the residual carbon and other reducing organic matters in the deoiled waste catalyst at normal temperature and pressure, the valuable metals vanadium, molybdenum and nickel in the waste catalyst can be efficiently oxidized and leached, and the energy consumption is saved.