Conference Paper

Clay minerals as scavengers and sources of metals in the environment; experimental studies

March 2019

Conference: ENVIWEATH 96, Environmental Aspects of Weathering Processes, UBESCO UISG

Authors:

Edeltrauda Helios-Rybicka

AGH University of Krakow

Adam Piestrzyński

AGH University of Krakow

Clay minerals have been applied as heavy metal "acceptors" and "donors". The exchangeable ions: Ca+2, Na+, K+, etc. have been substituted by heavy metal ions: Cu, Pb, Cd, Zn, Tl, Ag, Hg. The ssaturated clay minerals were treated with aqueous H2S sollution. The heavy metals ions were released and precipitatedas sulphide minerals (at 80 oC); after 5 days the well crystallised sulphides are formed; Covellite CuS, galena PbS and sphalerite ZnS were identified by X-ray method. The microscope observations revealed other Cu-Fe minerals like chalcopyrite CuFeS2, idaite, bornite. Cadmium formed hawleyte - CdS, also metacinnabar HgS was determined. The numbers of thallium sulphides were also obtained: TlS, Tl2S-carlinite, Tl2S5, Tl4S3 and TlFeS2 -raquinite, Cu3Tl2S5, Cu2TlS3 and AgTlS2.

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Article

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Clay minerals as a scavengers of heavy metals in the soils and sediments and, formation of metal sul...

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The saturated with the metal ions (Cu, Pb, Cd, Zn, Tl, Ag, Hg) clay minerals were treated by aqueous H 2 S solution under controlled Eh and pH conditions. The heavy metals ions were released and precipitated at 80 o C as sulphides, in most cases appeared to be crystalline. They often form coatings or crystals overgrown on clay minerals or form tight intergroths with clay particles. After 5 days ... [Show full abstract] the well crystallised sulphides are formed; covellite-CuS, galena-PbS and sphalerite ZnS were identified by X-ray method. The microscope observations revealed some other Cu-Fe-minerals like chalcopyrite-CuFeS 2 , idaite, bornite. The native copper and pyrite were also observed. Cadmium formed hawleyite-CdS, whereas the crystals of greenockite were rarely found in the reaction products. Mercury react very quickly with S 2-ions and in the heavy fraction of reaction product the metacinnabar-HgS has been determined. The numbers of thallium sulphides were obtained: TlS, Tl 2 S-carlinite, Tl

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Conference Paper

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The saturated with the metal ions (Cu, Pb, Cd, Zn, Tl, Ag, Hg) clay minerals were treated by aqueous H 2 S solution under controlled Eh and pH conditions. The heavy metals ions were released and precipitated at 80 o C as sulphides, in most cases appeared to be crystalline. They often form coatings or crystals overgrown on clay minerals or form tight intergroths with clay particles. After 5 days ... [Show full abstract] the well crystallised sulphides are formed; covellite-CuS, galena-PbS and sphalerite ZnS were identified by X-ray method. The microscope observations revealed some other Cu-Fe-minerals like chalcopyrite-CuFeS 2 , idaite, bornite. The native copper and pyrite were also observed. Cadmium formed hawleyite-CdS, whereas the crystals of greenockite were rarely found in the reaction products. Mercury react very quickly with S 2-ions and in the heavy fraction of reaction product the metacinnabar-HgS has been determined. The numbers of thallium sulphides were obtained: TlS, Tl 2 S-carlinite, Tl

Experiment Findings

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Article

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Clay minerals as a scavengers of heavy metals in the soils and sediments and, formation of metal sul...

October 2018

Edeltrauda Helios-Rybicka

Abstract The saturated with the metal ions (Cu, Pb, Cd, Zn, Tl, Ag, Hg) clay minerals were treated by aqueous H2S solution under controlled Eh and pH conditions. The heavy metals ions were released and precipitated at 80oC as sulphides, in most cases appeared to be crystalline. They often form coatings or crystals overgrown on clay minerals or form tight intergroths with clay particles. After 5 ... [Show full abstract] days the well crystallised sulphides are formed; covellite - CuS, galena - PbS and sphalerite ZnS were identified by X-ray method. The microscope observations revealed some other Cu-Fe-minerals like chalcopyrite - CuFeS2, idaite, bornite. The native copper and pyrite were also observed. Cadmium formed hawleyite - CdS, whereas the crystals of greenockite were rarely found in the reaction products. Mercury react very quickly with S2- ions and in the heavy fraction of reaction product the metacinnabar - HgS has been determined. The numbers of thallium sulphides were obtained: TlS, Tl2S - carlinite, Tl2S5, Tl4S3 and TlFeS2 - raquinite, Cu3Tl2S5, Cu2TlS3, AgTlS, Ag4Tl2S3 and AgTlS2. Key words: clay minerals, syntheses, heavy metals, sulphides, ore microscopy, electron microprobe.

Conference Paper

Full-text available

Clay minerals as a scavengers of heavy metals in the soils and sediments and, formation of metal sul...

October 2018

Edeltrauda Helios-Rybicka

The saturated with the metal ions (Cu, Pb, Cd, Zn, Tl, Ag, Hg) clay minerals were treated by aqueous H 2 S solution under controlled Eh and pH conditions. The heavy metals ions were released and precipitated at 80 o C as sulphides, in most cases appeared to be crystalline. They often form coatings or crystals overgrown on clay minerals or form tight intergroths with clay particles. After 5 days ... [Show full abstract] the well crystallised sulphides are formed; covellite-CuS, galena-PbS and sphalerite ZnS were identified by X-ray method. The microscope observations revealed some other Cu-Fe-minerals like chalcopyrite-CuFeS 2 , idaite, bornite. The native copper and pyrite were also observed. Cadmium formed hawleyite-CdS, whereas the crystals of greenockite were rarely found in the reaction products. Mercury react very quickly with S 2-ions and in the heavy fraction of reaction product the metacinnabar-HgS has been determined. The numbers of thallium sulphides were obtained: TlS, Tl 2 S-carlinite, Tl