Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1991-05-17
1993-07-27
Heller, Gregory A.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423 62, 423 63, 423 64, 423 65, C01B 2516, C01G 3100, B01D 1600
Patent
active
052308766
ABSTRACT:
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.
REFERENCES:
patent: 2130579 (1938-09-01), Bowman
patent: 2830874 (1958-04-01), Long et al.
patent: 4327061 (1982-04-01), Hermann et al.
patent: 4851199 (1989-07-01), Young
Hutter Klaas J.
Johnson David K.
Kawakami Gene
Long Gary
Garmong Gregory
Heller Gregory A.
J. R. Simplot Co.
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