Process for preventing the formation of calcium sulphate scale

Details Process for preventing the formation of calcium sulphate scale Process for preventing the formation of calcium sulphate scale

1979-02-28

1980-09-09

Veritz, O. R.

Chemistry of inorganic compounds

Phosphorus or compound thereof

Oxygen containing

423167, 423555, C01B 2516, C01F 100

Patent

active

042217695

ABSTRACT:
The anti-scaling effect of additives added to control the formation of scale during the washing of calcium sulphate anhydrite or hemihydrate crystals is increased when the additives are added as soon as possible after the wash liquors leave the crystals. The invention is of especial use in the washing of calcium sulphate hemihydrate produced during the production of phosphoric acid and is carried out by adding the additives via the central valve of the rotating pan filter on which the hemihydrate crystals are washed.

REFERENCES:
patent: 3972981 (1976-08-01), Harper et al.
patent: 4049774 (1977-09-01), Harper et al.

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