METHOD OF PRODUCING TITANIUM DIOXIDE Russian patent published in 2013 - IPC C01G23/53 C22B3/08 

FIELD: chemistry.

SUBSTANCE: invention can be used in chemical industry. In order to obtain titanium dioxide, a mixture is prepared, leaching is carried out in sulphuric acid solution to form titanyl sulphate TiOSO₄ and iron sulphates FeSO₄ and Fe₂(SO₄)₃, followed by precipitation of iron sulphate FeSO₄ and hydrolysis of titanyl sulphate TiOSO₄ to obtain hydrated titanium dioxide TiO(OH)₂ and firing. The mixture is formed by adding potassium hydrogen sulphate KHSO₄. Before leaching, the obtained mixture is melted at temperature of 300-400°C to obtain a melt containing potassium titanate K₂TiO₃. The melt is then leached using sulphuric acid solution with concentration of 5-10%.

EFFECT: invention enables to reduce concentration of sulphuric acid used when leaching and prolongs the service life of process equipment.

3 cl, 2 ex