Sumitomo Metal Mining Company, Ltd.

Koji Sasaki

Takao Suzuki

Ryozo Ushio

Iichi Nakamura

Ryoichi Nakayama

Naoko Kikuta

Yuji Imaizumi

Masayuki Hisatsune

A method is provided for decomposing free cyanide ion and metallic cyano complex ions in a liquid, comprising the steps of bringing the liquid into contact with ozone gas in a counterflow relation in the condition that the pH of the liquid is at least 10 with the mass flow rate of the ozone in the ozone gas up to 20 mg per minute per liter of liquid, and then bringing the liquid into contact in a counterflow relation with ozone gas having an ozone concentration of at least 150 g/m,in the condition that the pH of the liquid is 7.0 to 9.5.

Method of processing cyanide ions by ozone

Growing community of inventors

Ichikawa, Japan

Koji Sasaki