Process of producing defluorinated product from low BPL phosphat

Details Process of producing defluorinated product from low BPL phosphat Process of producing defluorinated product from low BPL phosphat

1982-02-04

1983-12-27

Heller, Gregory A.

Chemistry of inorganic compounds

Treating mixture to obtain metal containing compound

Alkaline earth metal

423304, 423319, 71DIG3, C01F 100, C01F 500, C01F 1100

Patent

active

044230150

ABSTRACT:
In a process for producing a defluorinated product containing calcium, sodium and phosphorus, by calcination of a mixture of phosphate rock, with caustic soda, phosphoric acid and water, an improvement comprises maintaining the amount of phosphoric acid in the mixture such that the ratio of phosphorus in percentage by weight on a dry basis in said mixture-to-the phosphorus desired in percentage by weight in the calcined product is substantially equivalent to the ratio of the calcium in percentage by weight on a dry basis in the mixture-to-the calcium in percentage by weight in the calcined product. The process is especially useful where the phosphate rock has a bone phosphate of lime analysis of about 73% or less (e.g., about 71.5%), and also where the caustic soda is added to a mixture of phosphate rock and phosphoric acid prior to the addition of water.

REFERENCES:
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Article-"Production of Defluorinated Phosphate Rock-Calcining without Fusion in Rotary Kilns"-by W. T. Whitney & C. A. Hollingsworth, Jul. 1949 of Industrial and Engineering Chemistry, pp. 1325-1327.

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