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THX-1138

Dissolving FeS2 (iron disulfide, iron pyrite)

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THX-1138    13

I have some finely-divided iron disulfide, possibly mixed with some other things, that I wish to 'dissolve' away -- or at any rate remove from the mix. What would be a good way of doing this using fairly safe chemicals? (I.e., not concentrated nitric acid, although H2SO4 or HCl are possible.) Among the things that may be left behind are SiO2 and microscopic amounts of gold, neither of which I'm concerned about being affected by the solvents.

 

If I heat FeS2, won't it break down and leave me with elemental Fe and SO2? If so, perhaps then I could act directly on the iron and make it into a soluble compound that could be dissolved and washed away..

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olmpiad    10

Just react it with some HCl, the Fe will go into solution, and the S will be given off as H2S.

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YT2095    591

Heat It, it will Then decompose, most acids won`t touch it.

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THX-1138    13

'S what I thought. However, I haven't been able to find any reference for the temperature at which it starts to break down. Any pointers?

 

Ta..

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