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Reactions of iron monosulfide solids with aqueous hydrogen sulfide up to 160°C

Authors
Journal
Journal of Inorganic and Nuclear Chemistry
0022-1902
Publisher
Elsevier
Publication Date
Volume
41
Issue
12
Identifiers
DOI: 10.1016/0022-1902(79)80106-2

Abstract

Abstract Reactions of powdered samples of the iron monosulfide phases mackinawite (tetragonal FeS 1− x troilite (hexagonal FeS) and a hexagonal pyrrhotite (Fe 0.9S), and of single crystals of troilite, with aqueous H 2S at a total pressure of 1.8 MPa and temperatures up to 160°C have been investigated. The reaction sequences mackinawite → (greigite) → pyrrhotite → pyrite, and troilite → pyrrhotite → pyrite have been established by X-ray powder diffractometry. Morphological examination by scanning electron microscopy has permitted a distinction to be made between solid state and solution pathways for most of the transformations and factors which affect the rate of crystallization of pyrite have been identified.

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