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SUMMARY:EXPERIMETAL AND DENSITY FUNCTIONAL THEORY COMPARISON STUDY OF XANT
 HATE\, DITHIOCARBAMATE AND DITHIOPHOSPHATE ADSORPTION ON SPERRYLITE SURFAC
 E
DTSTART;VALUE=DATE-TIME:20210726T133000Z
DTEND;VALUE=DATE-TIME:20210726T134500Z
DTSTAMP;VALUE=DATE-TIME:20260811T054239Z
UID:indico-contribution-7085@events.saip.org.za
DESCRIPTION:Speakers: Bradley Nemutudi (University of Limpopo)\nThe compar
 ison study on adsorption of normal butyl xanthate (PNBX)\, mono butyl dith
 iocarbamate (BDTC) and dibutyl dithiophosphate (DBDTP) on sperrylite miner
 al forms a basis in understanding the floatability improvement and paves a
  way for design of collectors that may impact a wide range of arsenide min
 erals. This study used a computational density functional theory (DFT) and
  experimental microcalorimetry approach to determine the adsorption energi
 es of NBX\, BDTC and BDTP collectors onto sperrylite mineral surface. For 
 computational aspect\, we considered the most stable surface plane of (100
 ) surface\, which had been found to give the lowest surface energy as comp
 ared to the other surface planes. We observed that the NBX\, BDTC and BDTP
  preferred to bridge on the As and Pt atoms through the S atoms. These fin
 ding showed that the collector adsorb on the surface through both Pt and A
 s atoms and indicated that the As atoms were significantly active in the a
 dsorptions. The computational calculated adsorption energies were in the o
 rder: BDTC (–376.93 kJ/mol) > NBX (–369.47 kJ/mol) > BDTP (–350.97 k
 J/mol)\, indicating that the dithiocarbamate had strong exothermic adsorpt
 ion. From the microcalorimetry test we also found that the BDTC was more e
 xothermic than the BDTP and the PNBX and the adsorption energies were in t
 he order: BDTC (–473.50 kJ/mol) > BDTP (–392.56 kJ/mol) > NBX (–331.
 13 kJ/mol). These results showed that nitrogen atom in the BDTC collector 
 had a great influence in the adsorption strength of the collector on the m
 ineral surface. These results paved a way for design of novel collector fo
 r sperrylite and other chalcogenide minerals and suggested that nitrogen i
 n a collector may significantly improve the affinity of the collector for 
 better recovery.\n\nhttps://events.saip.org.za/event/206/contributions/708
 5/
LOCATION:North-West University Potchefstroom Campus
URL:https://events.saip.org.za/event/206/contributions/7085/
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