Process for producing ammonium metavanadate
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United States of America Patent
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Dec 25, 2001
Issued Date -
N/A
app pub date -
Jan 14, 2000
filing date -
Dec 25, 1996
priority date (Note) -
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Abstract
A process is provided for preparing ammonium metavanadate from the combustion ashes resulting from the combustion of petroleum fuels in a boiler by using the ammonium sulfate and vanadium components in the combustion ash. Water is added to the combustion ash to form a slurry. The solids are removed from the slurry. Ammonia and an oxidizing gas, such as air, oxygen or ozone, are added to the aqueous solution obtained from the slurry to oxidize the vanadium, thereby producing an aqueous solution containing ammonium metavanadate. The ammonium metavanadate is crystallized and recovered from the aqueous solution. Calcium hydroxide or calcium oxide is injected into the aqueous solution and reacts with the ammonium sulfate to produce gypsum and ammonia. This gypsum and ammonia containing solution is flowed down a packed column, where it is counter-currently contacted with air or steam which strips the ammonia out of the solution. This ammonia stripped out of the solution is recycled back to the aqueous solution obtained from the slurry where the vanadium is oxidized into ammonium metavanadate.
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