Process for preparing nodular pigmentary titanium dioxide

Details Process for preparing nodular pigmentary titanium dioxide Process for preparing nodular pigmentary titanium dioxide

1987-09-29

1989-09-05

Stoll, Robert L.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423 84, 423 82, 75101R, 75114, 75121, C01G 23047, C22B 300

Patent

active

048637114

ABSTRACT:
A process for preparing nodular pigmentary titanium dioxide by grinding and mixing a titanium-bearing material, such as sorelslag, with an alkali metal compound such as sodium hydroxide, and roasting the mixture. The roasted material is ground followed by washing and filtering. Thereafter, the solid residue is digested with hydrochloric acid for a time and temperature sufficient to form nodular-shaped solids. After removing the acid by filtration and washing the solid residue, the residue is calcined to provide a nodular titanium dioxide pigment.

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