Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in thepresence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotationand electrophoretic light scattering measurements...Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in thepresence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotationand electrophoretic light scattering measurements. The experimental results showed that in theabsence of xanthate, pyrite flotation is slightly enhanced by Thiobacillus ferrooxidans. However,with xanthate as a collector, pyrite flotation is strongly depressed after being exposed to thebacteria. The longer is the time when the pyrite is exposed to the bacteria, the stronger thedepression is. The mechanism of the depression might be due to the formation of the biofilms ofThiobacillus ferrooxidans on pyrite surfaces, preventing the adsorption of xanthate on pyritesurfaces in the form of dixanthogen or xanthate ions.展开更多
文摘Bioflotation of pyrite with bacteria Thiobacillus ferrooxidans in thepresence or absence of potassium ethyl xanthate was studied on a pure pyrite through microflotationand electrophoretic light scattering measurements. The experimental results showed that in theabsence of xanthate, pyrite flotation is slightly enhanced by Thiobacillus ferrooxidans. However,with xanthate as a collector, pyrite flotation is strongly depressed after being exposed to thebacteria. The longer is the time when the pyrite is exposed to the bacteria, the stronger thedepression is. The mechanism of the depression might be due to the formation of the biofilms ofThiobacillus ferrooxidans on pyrite surfaces, preventing the adsorption of xanthate on pyritesurfaces in the form of dixanthogen or xanthate ions.
