Method for improving filterability of gypsum and wet process pho

Details Method for improving filterability of gypsum and wet process pho Method for improving filterability of gypsum and wet process pho

1983-01-19

1984-03-27

Heller, Gregory A.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423320, 423321R, 423166, 423555, C01B 2516, C01F 100, C01F 1146

Patent

active

044394071

ABSTRACT:
A process for the improved filterability of wet process phosphoric acid which comprises maintaining the ratio of ferric ion to ferrous ion in the wet process phosphoric acid above about 1.0 when the total iron concentration of the product wet process phosphoric acid is in the range of from about 0.5% Fe to about 0.9% Fe. The ratio of ferric ion to ferrous ion may be controlled by controlling the temperature in the final stage of a multi-stage calcining process, addition of iron in the form of a compound which yields ferric ion upon dissolution, the oxidation of the iron in the wet process phosphoric acid, or a combination of the above.

REFERENCES:
patent: 2851335 (1958-09-01), Heinerth
patent: 4048289 (1977-09-01), Pierres
patent: 4277454 (1981-07-01), Long et al.
patent: 4279877 (1981-07-01), Hill et al.

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