Abstract
Clay minerals saturated with metal ions (Cu, Pb, Cd, Zn, Tl, Ag, Hg) were treated by aqueous H2S solutions under controlled Eh and pH conditions. The heavy metal ions were released and precipitated at 80 °C as sulphides and in most cases appeared to be crystalline. They often formed coatings or crystals overgrown on clay minerals or formed tight intergrowths with clay particles. After 5 days, well crystallised sulphides were formed; covellite (CuS), galena (PbS) and sphalerite (ZnS) were identified by X-ray. The microscopic observations revealed some other Cu-Fe-minerals, like chalcopyrite (CuFeS2), idaite, and bornite. Native copper and pyrite were also observed. Cadmium formed hawleyite (CdS), whereas the greenockite crystals were rarely found in the reaction products. Mercury reacted very quickly with S2 ions and in the heavy fraction of the reaction products the metacinnabar (HgS) was determined. Several thallium sulphides were obtained: T1S, T12S (carlinite), T12S5, T14S3 and TlFeS2 (raquinite), Cu3Tl2S5, Cu2TlS3, AgTlS, Ag4Tl2S3 and AgTlS2.
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© 1999 Springer Science+Business Media Dordrecht
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Rybicka, E.H., Piestrzynski, A., Schmidt, S.T. (1999). Experimental Study on the Formation of Heavy Metal Sulphides Using Layer Silicates: Environmental Aspects. In: Misaelides, P., Macášek, F., Pinnavaia, T.J., Colella, C. (eds) Natural Microporous Materials in Environmental Technology. NATO Science Series, vol 362. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4499-5_9
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DOI: https://doi.org/10.1007/978-94-011-4499-5_9
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