Chemistry of inorganic compounds – Phosphorus or compound thereof – Oxygen containing
Patent
1982-01-12
1983-07-12
Vertiz, O. R.
Chemistry of inorganic compounds
Phosphorus or compound thereof
Oxygen containing
423166, 423319, 423309, 71 43, C01B 2516, C01B 1516, C01B 2526
Patent
active
043930328
ABSTRACT:
Phosphate rock, including low grade phosphate ore, is treated to recover phosphoric acid and other valuable products by a series of steps including contacting phosphate ore with a weak phosphoric acid to form a suspension of at least a portion of the slimes contained in the ore so that the slimes can be separated from the ore, and separating the slimes to provide a deslimed phosphate ore. Deslimed phosphate rock is solubilized with phosphoric acid to convert at least a portion of the calcium contained in the rock and form a solution of monocalcium phosphate and phosphoric acid. After removal of solids, this solution can be treated with sulfuric acid in a gypsum crystallizer to form gypsum and the phosphoric acid product wherein filterable gypsum crystals are obtained by maintaining a total SO.sub.3 content of 1.5-4 wt. % in a first crystallizer and neutralizing the SO.sub.3 in a second crystallizer. In other aspects of the invention, at least a portion of the phosphoric acid produced may be recycled to convert additional ore and the slime suspension may be treated to recover the weak acid recovered from the suspension. Further, wash water from the gypsum filter may be recycled to the desliming stage, the filtrate from the deslimer may be cycled to the acidulation reactor and monocalcium phosphate may be recovered as a separate product from phosphoric acid and connected to other useful products.
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Drechsel Erhart K.
Holcomb Dysart E.
Sardisco John B.
Heiler Gregory A.
Pennzoil Company
Vertiz O. R.
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