Preparation of phosphates

Details Preparation of phosphates Preparation of phosphates

1971-04-19

1976-05-11

Vertiz, Oscar R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

71 34, 71 43, 423312, 423202, C01B 1316, C01B 2020

Patent

active

039564649

ABSTRACT:
Potassium phosphates useful as fertilizer materials, are produced by the reaction of phosphate rock or a solubilized form thereof, concentrated sulfuric acid and potassium hydrogen sulfate wherein the potassium hydrogen sulfate is added in a controlled manner and preferably in admixture with at least a portion of the sulfuric acid, the precipitated calcium sulfate precipitate is removed and the filtrate processed for recovery of the potassium phosphates. In further embodiments, high-sulfate containing filtrates are treated to lower the sulfate ion content of the products and effect partial neutralization by any of several methods such as by treatment thereof with fresh phosphate rock or source of calcium ion such as calcium oxide, alternatively or successively, and the resulting solution is used as a fertilizer, or liquids are removed and the solids are dried and/or dehydrated for recovery of the potassium phosphate compounds. Also methods are provided for the addition of nitrogen values.

REFERENCES:
patent: 3124419 (1964-03-01), Germain
patent: 3547615 (1970-12-01), Beckham
patent: 3600152 (1971-08-01), Drechsel et al.
patent: 3697246 (1972-10-01), Drechsel et al.
patent: 3718453 (1973-02-01), Thompson
Thompson, New Route Cuts Costs for Potassium Orthophosphates, Chemical Engineering, Apr. 5, 1971, pp. 83-85.

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