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Contribution Poster

Budker INP - 2nd and 3rd floors
X-ray spectroscopy

XAFS study of model flotation system - xanthate/zinc sulphate: stuctural determination of interaction forms existing in aqueous solution and deposition.

Speakers

  • Dr. Vladimir KRIVENTSOV

Primary authors

Co-authors

Content

Presently our country takes the first place in terms of reserves and production of mineral resources, but the quality of many ore deposits is low. Ores most involved in the development of new deposits can be classified hard-to-concentrate, with a low content of useful components. Existing technologies of enrichment in some cases do not correspond to the quality of modern ores. So Russia, having large mineral reserves, faces difficulties in providing new technologies that can cost-effectively and efficiently process those materials. The decision of the problem of increasing the profitability of processing minerals and improving comprehensiveness of their enrichment are of paramount importance. One of the possible technological solutions is the developing approach of selective flotation separation of minerals with optimization of the proportion and properties of chemical and physical forms of sorption by combining different types of flotation reagents. One of the most popular reagents is butyl xanthate potassium, which is widely used for the extraction of valuable components by flotation in aqueous solution. The main aim of this work is a study of model flotation system - xanthate/zinc sulphate by the method of XAFS spectroscopy. All EXAFS and XANES spectra (Zn-K edge) of the samples studied (both in solution and deposition) were recorded at EXAFS station of Siberian Synchrotron Terahertz Radiation Center (SSTRC). Some differences of local structure of initial solutions of zinc sulfate (having different concentrations from ~10-4 up to 10-1 mol/l) between each other and great ones compared to the bulk samples were found. The presence of different Zn-O forms were detected. For the model flotation system - xanthate/zinc sulphate in aqueous solution, Zn-S forms were predominantly found. Structural determination of all interaction forms existing in aqueous solution and deposition were carried out in detail. All possible structural models were discussed. Additionally powder samples of initial reagents and final depositions were characterized by XRD. The atomic structures of initial bulk sample were established. The work was done using the infrastructure of the Shared-Use Center "Siberian Synchrotron and Terahertz Radiation Center (SSTRC)" based on VEPP-3 of BINP SB RAS. This work is supported by Russian Scientific Foundation (Project No 15-17-10017).