MICROENVIRONMENTS DETERMINING GROWTH OF ACIDOPHILIC BACTERIA IN Zn-Pb FLOTATION TAILINGS OF NEUTRAL REACTION

Beata Cwalina, Małgorzata Pacholewska, Maria Sozańska, Jerzy Cabała
2009 Environment Protection Engineering   unpublished
Zinc and lead ore flotation tailings deposited in the Olkusz region show a neutral reaction. They are composed of dolomite-type minerals (alkaline), mostly Ca,Mg(CO 3) 2 and Ca,Mg,Fe(CO 3) 2 (70%), and other minerals including sulphides (acid), mainly pyrite and marcasite (FeS 2 ; up to 20%). Sulphur and iron concentration in tailings reaches the levels of 7-14% and of 8-16%, respectively. The microenvironments rich in sulphide minerals present in waste materials which indicate almost neutral
more » ... te almost neutral reaction allow the metabolic activity of acidophilic sulphur-and iron-oxidizing bacteria of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans species to be grown and developed, in spite of the alkaline character of basic mineral components in the tailings examined.
fatcat:tu6r4j462rcm7i53cndy7mf27i