No.1-15 Recovery of Rare Metals from Spent Denitrification Catalyst

Abstract

Selective recovery process of titanium, vanadium and tungsten has been developed for the spent denitrification catalyst produced from coal fired plant. Volatilization behaviors of the rare metals were followed in a chlorine gas stream with the addition of carbon as a reducing agent. Methanol vapor was supplied to a fixed bed of catalyst at 400 °C and fine carbon was deposited on the surface of catalyst. The volatilization rates of the rare metals ware enhanced drastically with the use of the deposited carbon compared to pyrolytic carbon prepared from phenolphthalein. The rare metals in the catalyst could be recovered selectively at 400 °C without silicon, iron and aluminum when the deposited carbon of 20 wt% was used.