Method for producing fertilizer-grade phosphoric acid

Details Method for producing fertilizer-grade phosphoric acid Method for producing fertilizer-grade phosphoric acid

1982-07-19

1984-07-31

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423319, 71 37, 71 40, 422 62, C01B 2516

Patent

active

044629729

ABSTRACT:
A process for producing fertilizer-grade phosphoric acid is disclosed. In the process, a rock slurry is produced from a predetermined quantity of phosphate rock and a predetermined quantity of pond water neutralized with ammonia. A predetermined rate of sulfuric acid is added to the rock slurry to produce a reaction mixture. The improvement comprises maintaining an excess of sulfate ion in the reaction mixture.

REFERENCES:
patent: 2979385 (1961-04-01), Karasek et al.
patent: 3017247 (1962-01-01), Huxley
patent: 3104946 (1963-09-01), Veal
patent: 3178263 (1965-04-01), Karasek et al.
patent: 4402923 (1983-09-01), Lang
Quantitative Chemical Analysis, Fourth Edition, I. M. Kolthoff, E. B. Sandell, E. J. Meehan, S. Bruckenstein, 1969, pp. 602-791.

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