PRODUCTION OF PHOSPHORIC ACID FROM PHOSPHATE ORE

专利名称：PRODUCTION OF PHOSPHORIC ACID FROM

PHOSPHATE ORE

发明人：ERHART K. DRECHSEL,DYSART E.

HOLCOMB,JOHN B. SARDISCO

申请号：AU1007983申请日：19830106公开号：AU558712B2公开日：19870205

摘要：Phosphate rock, including low grade phosphate ore, is treated to recoverphosphoric acid and other valuable products by a series of steps including contactingphosphate ore with a weak phosphoric acid to form a suspension of at least a portion ofthe slimes contained in the ore so that the slimes can be separated from the ore, andseparating the slimes to provide a deslimed phosphate ore. Deslimed phosphate rock issolubilized with phosphoric acid to convert at least a portion of the calcium contained inthe rock and form a solution of monocalcium phosphate and phosphoric acid. Afterremoval of solids, this solution can be treated with sulfuric acid in a gypsum crystallizerto form gypsum and the phosphoric acid product wherein filterable gypsum crystals areobtained by maintaining a total SO3 content of 1.5-4 wt. % in a first crystallizer andneutralizing the SO3 in a second crystallizer. In other aspects of the invention, at least aportion of the phosphoric acid produced may be recycled to convert additional ore andthe slime suspension may be treated to recover the weak acid recovered from thesuspension. Further, wash water from the gypsum filter may be recycled to the deslimingstage, the filtrate from the deslimer may be cycled to the acidulation reactor and

monocalcium phosphate may be recovered as a separate product from phosphoric acidand connected to other useful products.

申请人：PENNZOIL CO.

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