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SUMMARY:XAFS study of model flotation system - xanthate/zinc sulphate: stu
 ctural determination of interaction forms existing in aqueous solution and
  deposition.
DTSTART;VALUE=DATE-TIME:20160705T090000Z
DTEND;VALUE=DATE-TIME:20160705T100000Z
DTSTAMP;VALUE=DATE-TIME:20260610T154709Z
UID:indico-contribution-1245@indico.inp.nsk.su
DESCRIPTION:Speakers: Vladimir Kriventsov (Boreskov Institute of Catalysis
 )\nPresently our country takes the first place in terms of reserves and pr
 oduction of mineral resources\, but the quality of many ore deposits is lo
 w. Ores most involved in the development of new deposits can be classified
  hard-to-concentrate\, with a low content of useful components. Existing t
 echnologies of enrichment in some cases do not correspond to the quality o
 f modern ores. So Russia\, having large mineral reserves\, faces difficult
 ies in providing new technologies that can cost-effectively and efficientl
 y process those materials. The decision of the problem of increasing the p
 rofitability of processing minerals and improving comprehensiveness of the
 ir enrichment are of paramount importance. One of the possible technologic
 al 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\, w
 hich is widely used for the extraction of valuable components by flotation
  in aqueous solution.\nThe main aim of this work is a study of model flota
 tion system - xanthate/zinc sulphate by the method of XAFS spectroscopy. A
 ll EXAFS and XANES spectra (Zn-K edge) of the samples studied (both in sol
 ution and deposition) were recorded at EXAFS station of Siberian Synchrotr
 on Terahertz Radiation Center (SSTRC).  Some differences of local structur
 e of initial solutions of zinc sulfate (having different concentrations fr
 om ~10-4 up to 10-1 mol/l) between each other and great ones compared to t
 he bulk samples were found. The presence of different Zn-O forms were dete
 cted. For the model flotation system - xanthate/zinc sulphate in aqueous s
 olution\, Zn-S forms were predominantly found. Structural determination of
  all interaction forms existing in aqueous solution and deposition were ca
 rried out in detail. All possible structural models were discussed. Additi
 onally powder samples of initial reagents and final depositions were chara
 cterized by XRD. The atomic structures of initial bulk sample were establi
 shed.\nThe work was done using the infrastructure of the Shared-Use Center
  "Siberian Synchrotron and Terahertz Radiation Center (SSTRC)" based on VE
 PP-3 of BINP SB RAS. This work is supported by Russian Scientific Foundati
 on (Project No 15-17-10017).\n\nhttps://indico.inp.nsk.su/event/3/contribu
 tions/1245/
LOCATION:Budker INP 2nd and 3rd floors
URL:https://indico.inp.nsk.su/event/3/contributions/1245/
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