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Etude du potentiel polluant de rejets anciens et actuels de la métallurgie du plomb dans le district de Přibram (République tchèque).

Abstract : Old and recent PB-Zn pyrometallurgical slags ans mattes from smelting activities in the Přibram district, Czech Republic, were studied. The present study addresses the detailed chemical and mineralogical characterisation of slags and mattes and on their weathering. Four principal types of slags were studied : i) Middle Age slags (XIIIth century) resulting from Pb-Ag ores in primitive furnces at Bohutin (7km SW of Přibram), ii) slags from historical ore processing at Přibram, up to 200 years old, iii) quenched slags from car battery processing, several decades old and iv) recent slags produced by the Varta technology in the Přibram smelter. The XRD, SEM/EDS and EPMA analytical techniques were used to identify the major solid slag phases : spinel, melilite, clinopyroxene, olivine, garnet, glass. Metals are present either as massive mattes, or as metallic droplets of variable size (< 1mm-300mm) trapped within the glass. The following sulphide and metallic phases were identified : galena, wurtzide, pyrrhotite, bornite, digenite, native metals and various intermetallic compounds of Sb, Sn, Ni, Cu, As and Fe. The investigation of natureal weathering revealed that mattes are more reactive than silicate slags. Two natural weathering features were identified in the oldest slags : i) selective leaching devitrification of glass and ii) precipitation of secondary phases of complex composition. Two types of long-term (1 year) laboratory leaching tests were carried out : i) leaching of poslished sections in order to determine the preferential dissolution of principal phases under the extreme, basic and acid-complexing conditions, and ii) leaching of crushed slag fractions in order to determine the amount of elements released into the solution. The leaching tests were coupled with the thermodynamic modeling (EQ3NR) in order to determine the element speciation and the saturation indices of possibly precipitating solid phases. The results of thermodynamic models were supplemented by the determination of newly formed phases, using DRX, SEM/EDS and STEM analyses. The computer code PHREEQC-2 was used to simulate of sorption of arsenic and other elements at the surface of hydrous ferric oxides (HFO). For the storage of this type of waste we suggest a “free air” scenario which allows the precipitation of cerussite and the formation of HFO, with efficient trapping of arsenic and other toxic elements. Quenched glass-rich slags are found to release a significant amount of Pb and are not suitable for any further valorisation. The leaching tests revealed that in organic-complexing and in extremely basic solutions, high amounts of Pb and other toxic elements are released. Consequently, slag storage in soils rich in organic matteror civil , or the use of slags in concrete are not recommended. The valorisation of recent slags for civil engineering purposes, such as orad construction, must be further discussed and evaluated.
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  • HAL Id : tel-00002329, version 1

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Vojtěch Ettler. Etude du potentiel polluant de rejets anciens et actuels de la métallurgie du plomb dans le district de Přibram (République tchèque).. Minéralogie. Université d'Orléans, 2000. Français. ⟨tel-00002329⟩

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