Abstract
Sulphide phases were studied in glassy and crystalline slags after smelting of polymetallic ores from the Jihlava and the Havlíčkův Brod Ore Districts. Sulphides usually form droplets from μm to mm in diameter. They exhibit complex composition with prevalence of pyrrhotite and sphalerite. Rudashevskyite (Fe,Zn)S occurs as a result of isomorphic substitution of Fe by Zn. Cu was rarely identified as native metal but usually it represents an admixture in a Cu-Fe-S phase with stoichiometry close to bornite. Pb is mainly present as galena or lead monoxide. Native silver as well as Ba-analogon of apatite were also identifi ed. For evaluation of potential release of heavy metals due to the preferential dissolution of sulphides and metallic phases, leaching tests in aqueous solution of sodium acetate were carried out. Data from leaching tests were compared with limit values defined by USEPA (1994) for solid wastes. The limit values were not exceeded only in case of Cd and As. The limit for Pb was exceeded in all cases except for one sample. For assessing of Zn and Cu limits for acute toxicity defi ned for aquatic habitats (USEPA 2006) were used; the obtained concentrations in leachates were several orders of magnitude higher.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
