C - Chemistry – Metallurgy – 01 – B
Patent
C - Chemistry, Metallurgy
01
B
C01B 25/238 (2006.01) B01J 19/00 (2006.01) B01J 47/12 (2006.01) C01G 31/00 (2006.01)
Patent
CA 2068782
REMOVAL OF VANADIUM FROM PHOSPHORIC ACID ABSTRACT OF THE DISCLOSURE An apparatus for removing vanadium from phosphoric acid includes a precipitator that receives vanadium-containing process-feed phosphoric acid and adds an oxidant to the process-feed phosphoric acid, whereupon precipitates containing phosphorus and vanadium are formed in a phosphoric acid filter feed slurry. The solid precipitate is removed by a filter. The filtrate, after optional further oxidation, is contacted to an ion exchange resin to remove additional vanadium from the filtrate to produce a phosphoric acid product of reduced vanadium content. A first portion of the phosphoric acid product is removed from the apparatus for further use. A reducing agent is added to a second portion of the phosphoric acid product, and the reduced acid is used to strip vanadium from the loaded ion exchange resin. The vanadium-loaded second portion of the phosphoric acid is mixed with fresh phosphoric acid and fed to the precipitator. The phosphoric acid in the precipitator has a phosphate content of from about 40-45 percent, and at least a portion of the phosphoric acid in the precipitator is produced by diluting more concentrated phosphoric acid to the 40-45 percent phosphate range.
Hutter Klaas J.
Johnson David K.
Kawakami Gene
Long Gary
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