Mitsubishi Heavy Industries Limited

Akita University

Katsuyasu Sugawara

Ikuhiro Sumi

Ryota Murai

Takahiro Kato

Norihisa Kobayashi

Kozo Iida

Katsumi Nochi

Masashi Kiyosawa

Yuuki Mochizuki

A separation and recovery method that enables titanium and tungsten to be separated and recovered from a used DeNOx catalyst in high yield. Specifically, a method of separating and recovering metal elements that 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 the catalyst is exposed 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.

Method of separating and recovering metal elements

Growing community of inventors

Akita, Japan

Katsuyasu Sugawara