| 研究実績の概要 |
The most significant achievements of these research are as follows:
1.Micro-seed enhanced encapsulation was more effective at pH 2-6 using hematite or other iron-oxide precursor minerals (e.g., schwertmannite, ferric arsenate) as micro-seeds. The coating formed under these conditions was relatively uniform, thick and had considerable mechanical strength.
2.Organic molecules that form redox sensitive metal-organic complexes can be used as “smart” carriers and specifically target sulfide minerals like pyrite and arsenopyrite. Our results showed that redox-sensitive metal-complexes like ferric-catechol, ferrous-catechol, aluminum-catechol and titanium-catechol suppressed the oxidation of sulfide minerals (e.g., pyrite and arsenopyrite).
3.We found a promising new way to specifically target sulfide minerals like pyrite by using galvanic interaction. When pyrite is in contact with metals like aluminum or zero valent iron, the metal is preferentially dissolved and under certain conditions, suppressed pyrite dissolution by forming a protective coating.
4.We were the first to report that metal oxides strongly influenced the two half-cell reactions during pyrite oxidation. For example, hematite directly enhanced the anodic half-cell reaction via electron “bridging” and catalytic effects.
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