Abstract: Using titaniferous slag from the process of ‘coal-based direct reduction in rotary hearth furnace-further reduction and smelting and separation in electric furnace’ as raw material,TiO₂ Pigment with a content of titanium dioxide over 98% was produced by sub-molten salt process.The optimum testing conditions for the production were studied,aiming to find out the optimum reaction time,alkaline ratio,reaction temperature,and granularity of the raw material.After multistage solid-state ion exchange and removal of impurities,titaniferous solution(C_TiO2=180 g/L,effective acid coefficient F=2.0) was prepared from the intermediate product sodium metatitantate.Through hydrolysis,metatitanic acid with a particle size of D(0.5)=1.2 μm was obtained,and then it could be calcined to anatase TiO₂ products.