Inventors:
Klaas J. Hutter - Pocatello ID
David K. Johnson - Chubbuck ID
Gene Kawakami - Pocatello ID
Gary Long - Inkom ID
Assignee:
J. R. Simplot Co. - Pocatello ID
International Classification:
C01B 2516
C01G 3100
B01D 1600
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.