초록 ▼

Metal values including those of cobalt, vanadium, aluminum, molybdenum and tungsten are recovered from spent petroleum refining catalyst by acid leaching the metal values except those of molybdenum or tungsten, separating the resulting solution from the leach residue and selectively recovering the c

Metal values including those of cobalt, vanadium, aluminum, molybdenum and tungsten are recovered from spent petroleum refining catalyst by acid leaching the metal values except those of molybdenum or tungsten, separating the resulting solution from the leach residue and selectively recovering the cobalt, vanadium and aluminum values from the solution and recovering the molybdenum and tungsten values from the leach residue.

대표청구항 ▼

The method of recovering vanadium, iron, nickel, cobalt, aluminum, molybdenum and tungsten metal values from spent hydrodesulphurization catalyst additionally containing carbon and silicon which comprises the steps of contacting the catalyst with aqueous HCl at temperature near the aqueous acid boil

The method of recovering vanadium, iron, nickel, cobalt, aluminum, molybdenum and tungsten metal values from spent hydrodesulphurization catalyst additionally containing carbon and silicon which comprises the steps of contacting the catalyst with aqueous HCl at temperature near the aqueous acid boiling point in a primary leach stage and thereby dissolving substantially all the values of metals other then molybdenum and tungsten, separating and removing the resulting primary acid leach solution from the primary leach residue consisting mainly of molybdenum sulfide or tungsten values, carbon and silicon, removing from the primary acid leach residue substantially all the molybdenum and tungsten values, adding caustic soda and an oxidant to the primary acid leach solution and thereby precipitating vanadium and iron contained in the said solution in the form of redcake in which the vanadium is in the pentavalent state, separating and removing the redcake from the liquid phase, contacting the resulting substantially vanadium-free solution with a source of sulfur selected from the group consisting of sodium sulfide, sodium hydrogen sulfide and a combination of hydrogen sulfide and caustic soda and thereby precipitating nickel sulfide and cobalt sulfide, separating the resulting solid phase from the liquid phase, and recovering aluminum values from the liquid phase.