XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3 3053
(SCS2–) functionality as revealed in FT-IR results, while
the carboxylate (CO2–) functionality protruded into solu-
tion due to the highly negative potential existing on the
functional group, hence making chalcopyrite hydrophilic
thereby causing its depression even though ethyl xanthate
was still present as a co-adsorbed species. Although the
two molecules are the same length, the hydrophilic forces
from Orfom ® D8 dominate because they reach further into
solution than the hydrophobic forces from ethyl xanthate.
Measured differently from previously results, zeta potential
studies with Orfom ® D8 also confirm that chalcopyrite
possesses a negatively charged surface between pH 7.5-10.5
but is maximum near pH 8.5-9.5 which agrees with flota-
tion tests conducted in previous studies. Pyrite and galena
interaction with Orfom ® D8 mimic that of chalcopyrite
indicating that Orfom ® D8 can also cause their depression.
When the collector was changed to n-dodecyl mercaptan
(Orfom CO 100), the same behavior of Orfom ® D8 on
chalcopyrite was observed. This was not anticipated but
results were explained because mercaptans are weaker col-
lectors and may have adsorbed at low density in a horizon-
tal orientation.
ACKNOWLEDGMENTS
Sincere appreciation is extended to Montana Technological
University and its Metallurgical &Materials Engineering
Department for their support of this research. Many thanks
are offered to Freeport McMoRan, Rio Tinto and Capstone
Copper for their coordinated funding and sponsorship.
Special gratitude is extended to David Miller of Chevron
Phillips Chemical who helped with the coordination we
hope he has a wonderful retirement.
REFERENCES
[1] Bagci, E., Ekmekci, Z. and Bradshaw, D., 2007.
Adsorption behaviour of xanthate and dithiophosph-
inate from their mixtures on chalcopyrite. Minerals
Engineering, 20(10), pp.1047–1053.
[2] Bai, L., Liu, J., Han, Y., Jiang, K. and Zhao, W., 2018.
Effects of xanthate on flotation kinetics of chalcopy-
rite and talc. Minerals, 8(9), p.369.
[3] Bozer, K.A., 2022. Synthesis and Stabilization of
Gold Nanoparticles from Chloride and Cyanide
Systems (Doctoral dissertation, Montana Tech of The
University of Montana).
[4] Bresson, C.R., Parlman, R.M. and Robles, B.R.,
Phillips Petroleum Co, 1984. Polycarboxylic acid
derivatives and uses. U.S. Patent 4,482,480.
[5] Burke, A., Yilmaz, E., Hasirci, N.E.S.R.İ.N. and
Yilmaz, O., 2002. Iron (III) ion removal from solu-
tion through adsorption on chitosan. Journal of
Applied Polymer Science, 84(6), pp.1185–1192.
[6] Chen, J.H., Lan, L.H. and Liao, X.J., 2013.
Depression effect of pseudo glycolythiourea
acid in flotation separation of copper–molybde-
num. Transactions of Nonferrous Metals Society of
China, 23(3), pp.824–831.
-110.00
-90.00
-70.00
-50.00
-30.00
-10.00
10.00
30.00
pH
CuFeS2 +CO 100
CuFeS2 +CO 100 +D8
MoS2 +CO 100
MoS2 +CO 100 +D8
Figure 9. Electrophoretic Mobility of Chalcopyrite and Molybdenite with CO 100
collector and Orfom® D8
Zeta
Potenti
(mV)
(SCS2–) functionality as revealed in FT-IR results, while
the carboxylate (CO2–) functionality protruded into solu-
tion due to the highly negative potential existing on the
functional group, hence making chalcopyrite hydrophilic
thereby causing its depression even though ethyl xanthate
was still present as a co-adsorbed species. Although the
two molecules are the same length, the hydrophilic forces
from Orfom ® D8 dominate because they reach further into
solution than the hydrophobic forces from ethyl xanthate.
Measured differently from previously results, zeta potential
studies with Orfom ® D8 also confirm that chalcopyrite
possesses a negatively charged surface between pH 7.5-10.5
but is maximum near pH 8.5-9.5 which agrees with flota-
tion tests conducted in previous studies. Pyrite and galena
interaction with Orfom ® D8 mimic that of chalcopyrite
indicating that Orfom ® D8 can also cause their depression.
When the collector was changed to n-dodecyl mercaptan
(Orfom CO 100), the same behavior of Orfom ® D8 on
chalcopyrite was observed. This was not anticipated but
results were explained because mercaptans are weaker col-
lectors and may have adsorbed at low density in a horizon-
tal orientation.
ACKNOWLEDGMENTS
Sincere appreciation is extended to Montana Technological
University and its Metallurgical &Materials Engineering
Department for their support of this research. Many thanks
are offered to Freeport McMoRan, Rio Tinto and Capstone
Copper for their coordinated funding and sponsorship.
Special gratitude is extended to David Miller of Chevron
Phillips Chemical who helped with the coordination we
hope he has a wonderful retirement.
REFERENCES
[1] Bagci, E., Ekmekci, Z. and Bradshaw, D., 2007.
Adsorption behaviour of xanthate and dithiophosph-
inate from their mixtures on chalcopyrite. Minerals
Engineering, 20(10), pp.1047–1053.
[2] Bai, L., Liu, J., Han, Y., Jiang, K. and Zhao, W., 2018.
Effects of xanthate on flotation kinetics of chalcopy-
rite and talc. Minerals, 8(9), p.369.
[3] Bozer, K.A., 2022. Synthesis and Stabilization of
Gold Nanoparticles from Chloride and Cyanide
Systems (Doctoral dissertation, Montana Tech of The
University of Montana).
[4] Bresson, C.R., Parlman, R.M. and Robles, B.R.,
Phillips Petroleum Co, 1984. Polycarboxylic acid
derivatives and uses. U.S. Patent 4,482,480.
[5] Burke, A., Yilmaz, E., Hasirci, N.E.S.R.İ.N. and
Yilmaz, O., 2002. Iron (III) ion removal from solu-
tion through adsorption on chitosan. Journal of
Applied Polymer Science, 84(6), pp.1185–1192.
[6] Chen, J.H., Lan, L.H. and Liao, X.J., 2013.
Depression effect of pseudo glycolythiourea
acid in flotation separation of copper–molybde-
num. Transactions of Nonferrous Metals Society of
China, 23(3), pp.824–831.
-110.00
-90.00
-70.00
-50.00
-30.00
-10.00
10.00
30.00
pH
CuFeS2 +CO 100
CuFeS2 +CO 100 +D8
MoS2 +CO 100
MoS2 +CO 100 +D8
Figure 9. Electrophoretic Mobility of Chalcopyrite and Molybdenite with CO 100
collector and Orfom® D8
Zeta
Potenti
(mV)