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US 4,539,186 AGranted
Method for leaching and recovering vanadium from vanadium bearing by-product materials
AssigneeIntevep, S.A.
InventorsRoberto Schemel, Domingo Rodriguez, Ramon Salazar
Life of this patent
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Abstract
A method for the removal and recovery of vanadium from a vanadium bearing material by leaching the vanadium bearing material in the presence of a leach promoter and removing the vanadium so leached from the leaching solution by precipitation. The leaching promoter forces the vanadium present in the vanadium bearing material into solution.
Claims28
A process for the removal and recovery of vanadium and nickel from vanadium-nickel bearing materials comprising the steps of providing a vanadium-nickel bearing feedstock;
- leaching said vanadium-nickel bearing feedstock with an acid solution having a leaching promoter in said acid solution wherein said leaching promoter is a material selected from the group consisting of an ionic form of vanadium, hypochlorites of sodium, calcium and potassium, peroxides, chlorine dioxide and mixtures thereof;
- separating the pregnant leach liquor from the leached feedstock material and adjusting said pregnant leach liquor with a precipitating agent to a pH in the range of from about 5.5 to 6.5 so as to precipitate vanadium in its trivalent and tetravalent states wherein said precipitating agent is a material selected from the group consisting of hydroxides of sodium, potassium, calcium and mixtures thereof;
- and further adjusting the pregnant leach liquor with said precipitating agent to a pH in the range of from about 8.5 to 9.5 so as to precipitate nickel oxide.
Dependencies are inferred from the claim text.