講演情報
[3812-23-08]Effect of hydrogen peroxide on separation of chalcopyrite and molybdenite using flotation
○Gde Pandhe Wisnu Suyantara1, Tsuyoshi Hirajima1, Hajime Miki1, Keiko Sasaki1 (1. Kyushu University)
司会（Chairman）：Richard Alorro (Curtin University)
キーワード：
selective oxidation、flotation、molybdenite、chalcopyrite、hydrogen peroxide
Various oxidation treatments (i.e., plasma, and ozone) have been applied to separate molybdenite from other sulfide metals. However, plasma and ozone treatments exhibit stronger oxidation on chalcopyrite and molybdenite, reducing the separation selectivity of both minerals in flotation tests. On the other hand, hydrogen peroxide (H2O2) is frequently used as an oxidizing agent in wastewater treatment. It has also been reported to reduce the recovery of sulfide minerals. Therefore, the effect of H2O2 on separation of chalcopyrite and molybdenite was investigated in this study. Contact angle readings and surface images using atomic force microscopy (AFM) showed that chalcopyrite surface was more sensitive to surface oxidation compared to that of molybdenite in H2O2 aqueous solution. The floatability test of single mineral confirmed the contact angle results and AFM images, indicating a possibility for selective separation of chalcopyrite and molybdenite using a H2O2 aqueous solution. In addition, iron was used to improve the oxidation performance of H2O2 and its effect on the selective flotation of chalcopyrite and molybdenite is intensively studied in this work.