Selective Extraction and Separation of Titanium from Vanadium Slag and Preparation of TiO2

Abstract

Vanadium slag usually contains 13.52–19.03 mass % V2O3 and 6.92–14.35 mass % TiO2. The V in vanadium slag is effectively extracted by traditional methods, whereas Ti, a valuable metal, cannot be used. To effectively utilize the Ti, a new method for preparing TiO2 from vanadium slag via AlCl3 chlorination-TiCl4 hydrolysis was proposed in this work. The chlorination of Ti in vanadium slag, thermodynamics of hydrolysis of metal chlorides (TiCl4 and AlCl3), and hydrolysis of chlorides were investigated. Rutile TiO2 containing a small amount of impurities (1.58 mass % Al and 2.03 mass % Cl) was synthesized.