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Experimental study on the formation of heavy metal sulphides using layer silicates: environmental aspects

July 2018
Microporous Materials Natural Microporous Matirials in Environmental TechnologyBook with articles(1999 Kluwer Academic Publishers, Printed in the Netherlads)

Authors:

Edeltrauda Helios-Rybicka

AGH University of Krakow

Adam Piestrzyński

AGH University of Krakow

Clay minerals saturated with metal ions: Cu, Pb, Cd, Zn, Tl, Ag, Hg, were treated by H2S solutions under controlled Eh and pH. The metal ions were released and precipitated at 80 oC as sulphides, which appeard mainly to be crystalline; offen formed coatings or crystals overgrown on clay minerals: CuS, PbS and ZnS, but alsoCu-Fe-minerals: chalcopyrite CuFeS2, idaite and bornite. Cadmium formed hawleite (CdS), mercury the metacinobar (HgS). Several thallium sulphides were obtained: TlS, Tl2S (carlinite), Tl2S5, Tl4S3 and TlFeS2 (raquinite), Cu2TlS3, AgTlS, AgTlS2.

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Conference Paper

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

March 2019

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; ... [Show full abstract] 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.

Conference Paper

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

February 2019

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

Chapter

Full-text available

Experimental Study on the Formation of Heavy Metal Sulphides Using Layer Silicates: Environmental As...

January 1999

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, ... [Show full abstract] 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.

Experiment Findings

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

June 2019

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