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        Study effects of conventional flotation reagents on bioleaching of zinc sulfide

        M. Jafari,S. Chehreh Chelgani,S.Z. Shafaie,H. Abdollahi,E. Hadavandi 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.78 No.-

        Althoughflotation and bio-extraction of metals from its products are extensively investigated, there arefew studied which evaluated the effects of reagents on bioleaching process. Both structure andconcentration offlotation reagents are effective factors on microorganism activities. In this study,Kendall’s tau (t) as a statistical method was used to statistically access the effect of typical sulfideflotation surfactants (collectors: potassium amyl-xanthate, potassium isobutyl-xanthate, sodium ethyl-xanthate, potassium isopropyl-xanthate, and Dithiophosphate), and frothers: pine oil and methylisobutyl carbinol) on the bioleaching of Zn sulfides in a mixed culture (Leptospirillum ferrooxidans,Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans). To consider both structure andconcentration of these reagents, their molarities were used for the statistical evaluations. The Kendallassessments indicated that by increasing in the molarity of reagents, the pH value (the most effectivefactors of bioleaching) was increased (t: 0.56) while the ORP value (t:0.54), Fe3þFe2þ ratio (t:0.51) andnumbers of oxidizing bacteria (t:0.38) in the solution were decreased. Therefore, as a result of thesemulti-interactions, by increasing the molarity of reagents, Zn recovery was decreased (t:0.45). Theseresults potentially can be used for selection offlotation reagents when bioleaching would be themetallurgical metal extraction method.

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