Patent ID: 7498007
Filing Date: 2009-03-03
Classification: C22B,Y02P

Abstract:
1. A method of recovering vanadium from solutions or liquors containing sulfuric acid comprising steps of: a. oxidizing the vanadium in the solution or liquor to vanadium (V); b. adding to the solution or liquor a neutralizing agent selected from the group consisting of calcium hydroxide, quicklime, calcium carbonate and combinations thereof to form a precipitate of calcium sulfate and vanadium pentoxide; c. separating the vanadium pentoxide and calcium sulfate precipitate from the solution or liquor; d. adding an acid other than sulfuric acid to the vanadium pentoxide and calcium sulfate precipitate to obtain solid calcium sulfate and dissolved vanadium pentoxide; e. separating the solid calcium sulfate from the resultant solution obtained from step d; f. adding sodium hydroxide to the resultant solution; g. precipitating the vanadium pentoxide from the resultant solution; and h. separating the precipitated vanadium pentoxide from the resultant solution.