| 摘要 |
PROBLEM TO BE SOLVED: To provide a separation and recovery method that enables titanium and tungsten to be separated and recovered from a used DeNOx catalyst in a high yield.SOLUTION: A method for separating and recovering metal elements includes: a first heating step of heating a DeNOx catalyst containing titanium, tungsten, vanadium and iron in a chlorine atmosphere, thereby removing the vanadium and the iron from the DeNOx catalyst; and a second heating step, performed after the first heating step, of heating the DeNOx catalyst in a chlorine atmosphere while exposing the catalyst to a gas of a hydrocarbon compound (excluding CH) or an oxygen-containing carbon compound, thereby volatilizing the tungsten and the titanium from the DeNOx catalyst, and recovering the tungsten and the titanium from the DeNOx catalyst. |
