Sumitomo Metal Mining Company, Ltd.

Kyushu University

Yuji Imaizumi

Takao Suzuki

Ryozo Ushio

Naoko Kikuta

Iichi Nakamura

Ryoichi Nakayama

Yuji Aoki

Tsuyoshi Hirajima

Masayuki Hisatsune

Gde Pandhe Wisnu Suyantara

Hajime Miki

Eri Takida

Koji Sasaki

A mineral processing method capable of efficiently separating a copper mineral from a molybdenum mineral is provided. The mineral processing method includes: a conditioning step of adding sulfite as a surface treatment agent to a mineral slurry containing a copper mineral and a molybdenum mineral; and a flotation step of performing flotation using the mineral slurry after the conditioning step. The hydrophilicity of the copper mineral can be selectively enhanced by sulfite, so as to be able to produce a difference in hydrophilicity between the copper mineral and the molybdenum mineral. Therefore, the molybdenum mineral can be selectively caused to float, and the copper mineral and the molybdenum mineral can be efficiently separated from each other.

Mineral processing method

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

Niihama, Japan

Yuji Imaizumi