中文摘要：

以＂转底炉煤基直接还原—电炉深还原、熔分工艺＂得到的含钛炉渣为原料,经过亚熔盐法钛白工艺得到纯度在98%以上的二氧化钛产品。研究了亚熔盐法钛白工艺中反应最佳试验条件,得到最优的反应时间、碱矿比、反应温度、原料粒度;中间产物偏钛酸钠经多级固态离子交换、除杂制得钛液（CTiO2=180 g/L、有效酸系数F=2.0）;水解后制得偏钛酸粒度D（0.5）=1.2μm;经煅烧得到锐钛型二氧化钛产品。

英文摘要：

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（CTiO2=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.