Joseph F. Wilson

Process for removal of carbon black floc associated with wet-process phosphoric acid in the production of fertilizers

Black carbonaceous floc in wet-process phosphoric acid is removed by contact with an oxidizing agent during the neutralization step with ammonia. In an embodiment the black floc is removed in liquid fertilizers derived from wet-process phosphoric acid by reaction with an oxidizing agent at high temperatures. The oxidizing agent is preferably nitric acid.