Abstract: According to the properties of titanium slag produced from the smelting of Panzhihua ilmenite, the affecting factors of titanium slag digestion efficiency and titanium liquor properties were investigated by laboratory test. Based on the results, industrial experiments were taken on the 2 000 t/a titanium dioxide production plant and the technical process was optimized. The digestion efficiency of titanium slag come up to above 93.0%, the Ti³⁺ content is 1~3 g/L, the concentration of TiO₂ is higher 40~50 g/L than ilmenite digestion, and the technical indexes of titanium liquor are satisfied for the hydrolysis process.