Dissolving FeS2 (iron disulfide, iron pyrite)

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Dissolving FeS2 (iron disulfide, iron pyrite) Rate Topic:

#1 30 June 2007 - 02:49 AM THX-1138

Meson

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..