Purification process

Details Purification process Purification process

1978-09-14

1980-06-17

Vertiz, O. R.

Chemistry of inorganic compounds

Sulfur or compound thereof

Oxygen containing

423DIG2, C01F 1146

Patent

active

042083931

ABSTRACT:
A process for the treatment of aqueous sulphuric acid solutions containing dissolved ferrous sulphate comprising forming such a solution containing from 140 to 220 grams/liter free sulphuric acid in a first zone; adjusting the pH value of the solution in this zone to one in the range 3 to 4 by the addition of finely-divided calcium carbonate thereby precipitating calcium sulphate; passing the slurry thus produced to a second zone; adding to the second zone an aqueous solution of sulphuric acid containing from 3 to 80 grams/liter of free sulphuric acid; adjusting the pH value of the mixture in the second zone to one in the range 3.5 to 6 by the addition of finely-divided calcium carbonate thereby precipitating calcium sulphate and thereafter recovering from the second zone calcium sulphate suitable for use in the manufacture of plasterboard.

REFERENCES:
patent: 3375066 (1968-03-01), Murakaml et al.

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