A NOVEL SEQUENTIAL PROCESS OF BIOLEACHING AND CHEMICAL LEACHING FOR DISSOLVING NI, V, AND MO FROM SPENT PETROLEUM REFINERY CATALYST

摘要

The present invention relates to a method for leaching nickel, vanadium, and molybdenum from a petroleum refining catalyst in two steps. The method comprises: a step of preprocessing a petroleum refining catalyst to an organic solvent; a step of growing microorganism for oxidizing iron and sulfur on a medium; a step of centrifugally separating liquid obtained by filtering the grown microorganism so that a microorganism suspension can be obtained; a step of injecting the microorganism suspension to manufacture a nutrient medium and adding the preprocessed petroleum refining catalyst to the nutrient medium so as to bioleach the petroleum refining catalyst; and a step of adding a leaching agent after the bioleaching step to chemical leach the petroleum refining catalyst. [Reference numerals] (AA) START; (BB) END; (S10) Step of preprocessing a petroleum refining catalyst; (S20) Step of growing microorganism on a medium; (S30) Step of obtaining a microorganism suspension; (S40) Step of bioleaching the preprocessed petroleum refining catalyst; (S50) Step of chemical leaching the leached residues after the bioleaching step