Removal of aluminum contamination during production of phosphori

Details Removal of aluminum contamination during production of phosphori Removal of aluminum contamination during production of phosphori

1992-05-06

1993-08-17

Langel, Wayne

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423116, 4231574, 4233211, 423465, C01B 2516

Patent

active

052366790

ABSTRACT:
This invention provides a method for removing aluminum contamination from phosphoric acid during the acidulation of phosphate rock with sulfuric acid in the presence of recycled phosphoric acid. The method of this invention involves the addition of acid soluble silica to the acidulation slurry and calls for maintaining the molar ratio of non-fluosilicate fluoride (i.e. fluoride not complexed with silica) to aluminum in the liquid phase of the acidulation slurry between 2.5 and 5.0. These conditions favor the precipitation of aluminum as calcium tetrafluoaluminate dihydrate and enable the co-removal of this compound by filtration with by-product gypsum. This invention is particularily suitable for the processing of phosphate rocks with high iron and aluminum contents, such as the nonsedimentary phosphate rocks occurring in Sri Lanka.

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