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Alkali fusion method to extract vanadium and tungsten from spent SCR catalyst and to simultaneously prepare synthetic sodium titanate for the purpose of preparation of feedstock for TiO 2  manufacturing by hydrometallurgical processing was investigated. Based on the Na 2 O-TiO 2  phase diagram and experimentally obtained results, appropriate alkali-fusion temperature and molar ratio (MO x /Na 2 O + MO x ) were determined to prepare soluble vanadium, tungsten salts, and sodium titanate. As results, the extraction efficiency of vanadium and tungsten was &gt;99% and sodium titanate as feedstock for making TiO 2  was obtained under the following alkali fusion conditions: Temperature, 950 °C; reaction time, 20 min; molar ratio, 0.5. When the molar ratio (MO x /Na 2 O + MO x ) was less than 0.5, complete liquidized product (eutectic melt of the feedstock and Na 2 CO 3 ) was obtained at the given conditions. This method, compared to conventional alkali roasting, is advantageous for rapid synthesis of water-soluble compounds for leaching of vanadium and tungsten, and for use as feedstock for the preparation of TiO 2  by hydrometallurgical route.

Alkali fusion using sodium carbonate for extraction of vanadium and tungsten for the preparation of synthetic sodium titanate from spent SCR catalyst