Krumb Lecture: Chalcopyrite Depression With Orfom® D8 During Cleaner Flotation Of Cu-Mo Bulk Concent

When:  Mar 10, 2021 from 9:30 AM to 10:30 AM (MT)
Associated with  Virtual SME Section

You're invited to a complimentary Krumb lecture:

Chalcopyrite Depression With Orfom® D8 During Cleaner Flotation Of Cu-Mo Bulk Concentrate: Theory And Practice

by Courtney A Young, Lewis S. Prater Distinguished Professor


Wednesday, March 10, 2021
9:30AM MST

 Passcode: 998121
Meeting ID: 943 4745 2202



A Henry Krumb Virtual Lecture
by Courtney A Young, Lewis S. Prater Distinguished Professor
Metallurgical & Materials Engineering, Montana Technological University


Orfom® D8 is a low carbon-chain trithiocarbonate ((NaOOC)CH2SCSSNa) with anionic functional groups at both ends.  It was tested as an organic depressant in the differential flotation of molybdenite from chalcopyrite in the presence of either sodium isopropyl xanthate (SIPX) or potassium ethyl xanthate (KEX).  Results show that it depresses chalcopyrite while molybdenite remains floatable.  Orfom® D8 appears to adsorb specifically on chalcopyrite through its trithiol (CS3-) functional group via both chemisorption and metal complexation.  Chalcopyrite becomes hydrophilic due to the carbonate (COO-) functional group protruding from the surface.  Because Orfom® D8 does not appear to bond with molybdenite, it remains hydrophobic.  Results from a variety of spectroscopic tools (XPS and FTIR) are corroborated with cyclic voltammetry and zeta potential studies as well as DFT molecular models.  Successful trial runs at large pilot plant facilities are illustrated along with the economics comparing Orfom® D8 to traditional inorganic NaSH depressant.


Dr. Courtney Young is a graduate of three premiere mineral processing and extractive metallurgical engineering institutions.  He loves to apply these technologies to recover critical materials as well as solve mining sustainability problems associated with waste processing, water remediation, tailings and slags recycling, ash/dust and spent pot-liner treatment, energy reduction, and flowsheet development.  While a faculty member for over 27 years, Courtney has taught numerous courses for students and short courses for professionals.  His research has been funded by numerous entities ranging from federal government to industry.  Dr. Young enjoys working with companies to help them solve problems and/or work on projects that they cannot get to, particularly when it employs students and gets them real-world experiences.


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Rachel Grimes