pyrite coal iron

Beneficiation of pyrite from coal mining - ScienceDirect

The hydrated ferric sulphate is more usually found in the coaly substance DECOMPOSITION OF IRON PYRITE FROM COAL SEAMS 139 rather than on the pyrite itself Somewhat exceptionally, needle- shaped crystals of hydrated ferrous sulphate may grow out from the top of the nodular ferric sulphate

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