The invention provides a method for preparing
titanium white. The method comprises the following steps of: preparing
titanium solution from high
titanium hydrochloric acid leaching residue, which is prepared from a titanium iron material through a
hydrochloric acid leaching method, serving as a
raw material or one of raw materials through acidolysis by using
sulfuric acid; oxidizing the titanium solution, performing organic extraction and purification, and hydrolyzing to obtain
metatitanic acid; and performing washing, salt treatment,
calcination and surface treatment on the
metatitanic acid to prepare the titanium white. According to the method,
hydrochloric acid composite
system solution containing
chlorate is subjected to diffluent disposal and is recycled after the titanium iron material is leached, and is organically matched with a
cyclic process of an organic extraction and purification and
sulfuric acid system of the titanium solution, so that the titanium
solution treatment process and the cost are reduced; and since the used hydrochloric acid,
sulfuric acid and organic extraction agent can be recycled,
ferrous sulfate (green
vitriol) is not produced; and thus, the
discharge of dilute sulfuric acid and acidic
wastewater is effectively reduced, and the quality of the titanium white is obviously improved. According to the method provided by the invention, high efficiency, cleanness, low cost, low
energy consumption and low waste
discharge effects of an entire flow are realized; a novel process technology is provided for producing the titanium white by a sulfuric acid method; and fine grained rock type
ilmenite with
high calcium and
magnesium content at the Panxi area can be effectively utilized.