MANUFACTURE OF SYNTHETIC RUTILE

PURPOSE:To manufacture economically the title high-quality synthetic rutile with excellent leaching efficiency by allowing sulfuric acid to react with ferrous chloride in the hydrochloric acid decoction of titanium ore, and circulating the formed gaseous hydrogen chloride as the hydrochloric acid decocting liq. CONSTITUTION:Titanium ore which is thermally reformed by oxidation and reduction is leached with a leaching liq. consisting essentially of hydrochloric acid and ferrous chloride. The solid material is separated, and the leaching is cooled to crystallize out the ferrous chloride in the leaching liquid. The crystallized ferrous chloride is separated from the leaching liquid, and more than an equivalent of sulfuric acid is allowed to react to from gaseous hydrogen chloride and ferrous sulfate. The generated gaseous hydrogen chloride is taken out by using nonoxidizing gas as the carrier gas, absorbed into a circulating liq. in a gas absorber, circulated again as the hydrochloric acid decocting liq., and reutilized for the decoction. The ferrous sulfate formed in the reaction is refined, and used as a by-product high-quality iron sulfate which is of high industrial utility value.