초록 ▼

A process for enhancing recovery of cobalt from spent hydroprocessing catalysts when the spent catalyst particles are first roasted at between 400°C. and 600°C. and then contacted with a first aqueous solution of ammonia and an ammonium salt to recover nickel, cobalt, molybdenum and vanadium. The on

A process for enhancing recovery of cobalt from spent hydroprocessing catalysts when the spent catalyst particles are first roasted at between 400°C. and 600°C. and then contacted with a first aqueous solution of ammonia and an ammonium salt to recover nickel, cobalt, molybdenum and vanadium. The once-leached spent hydroprocessing catalysts are contacted with a second aqueous solution of sulfur dioxide. The metal values are precipitated with hydrogen sulfide and the precipitate is roasted with unroasted spent hydroprocessing catalysts.

대표청구항 ▼

A process to extract cobalt from spent hydroprocessing catalyst particles comprising: (a) roasting said catalyst particles in an atmosphere containing oxygen at a temperature in the range of between 400°C. and 600°C.; (b) contacting said roasted catalyst particles with a first aqueous solution of am

A process to extract cobalt from spent hydroprocessing catalyst particles comprising: (a) roasting said catalyst particles in an atmosphere containing oxygen at a temperature in the range of between 400°C. and 600°C.; (b) contacting said roasted catalyst particles with a first aqueous solution of ammonia and a compound selected from the group of ammonium-containing salts consisting of ammonium carbonate and ammonium sulfate, maintained at a temperature in the range of 85°C. to 95°C., in the presence of an oxygen-containing gas; (c) separating said catalyst particles from said first aqueous solution containing cobalt values; (d) contacting said catalyst particles with a second aqueous solution of sulfur dioxide; (e) separating said catalyst particles from said second solution; (f) precipitating metals present in said second solution with hydrogen sulfide as metal sulfide; and (g) roasting said precipitated metal sulfides with fresh spent catalyst in step (a).