MANUFACTURE OF FERRIC SULPHATE

摘要

A process for the manufacture of ferric sulphate solution wherein ferric oxide is reacted with a molar excess of sulphuric acid at a temperature of 105.degree.C. to 139.degree.C. to form a hot slurry of sulphuric acid, unreacted ferric oxide, solid ferric sulphate and ferric sulphate solution. The hot slurry is then diluted with water sufficient to dissolve all the solid ferric sulphate, the diluted slurry being maintained at a temperature of 20.degree.C. to 60.degree.C. The unreacted ferric oxide is then separated to provide a product solution of ferric sulphate in aqueous sulphuric acid. Unreacted ferric oxide is recycled for reaction with additional sulphuric acid. The process provides ferric sulphate solutions suitable for waste water treatment and can employ ferric oxide available as a by-product of the metal industry.