3050 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
therefore conducted as a function of pH to determine the
best conditions for Cu depression and Mo flotation.
Results for chalcopyrite in the absence and presence of
Orfom ® D8 are shown in Figure 6. By itself, as shown in
yellow, chalcopyrite is negatively charged and has a charge
reversal between pH 9-11. However, when chalcopyrite
is treated with Orfom ® D8, as shown in blue, the surface
charge becomes substantially more negative. There are three
major observations from these results. First, the behavior
must indeed be due to the CO2– functionality protruding
into solution. Second, the zeta potential change predomi-
nates between pH 7-10. Third, because Orfom ® D8 is
anionic and adsorbs at a surface that is already negatively
charged making it even more negative, it must be due to
chemisorption.
Molybdenite
Results for molybdenite in the absence and presence of
Orfom ® D8 are also shown in Figure 6. By comparison,
untreated molybdenite shown in red exhibits a slight
400 900 1400 1900
Wave Number (cm-1)
CuFeS2 +KEX
CuFeS2 +KEK +D8
Figure 4. FT-IR of Chalcopyrite with KEX and Orfom® D8
400 900 1400 1900
Wave Number (cm-1)
MoMRMo
MoMR +D8 Mo +
Figure 5. FT-IR of Molybdenite with and without Orfom® D8
Transmittance(%) 1033.84
1124.49
1199.79
1265.03
1035.77
1124.49
1197.79
Transmitan
(%)468.70
781.17 1093.63
468.70
781.17 1093.63
therefore conducted as a function of pH to determine the
best conditions for Cu depression and Mo flotation.
Results for chalcopyrite in the absence and presence of
Orfom ® D8 are shown in Figure 6. By itself, as shown in
yellow, chalcopyrite is negatively charged and has a charge
reversal between pH 9-11. However, when chalcopyrite
is treated with Orfom ® D8, as shown in blue, the surface
charge becomes substantially more negative. There are three
major observations from these results. First, the behavior
must indeed be due to the CO2– functionality protruding
into solution. Second, the zeta potential change predomi-
nates between pH 7-10. Third, because Orfom ® D8 is
anionic and adsorbs at a surface that is already negatively
charged making it even more negative, it must be due to
chemisorption.
Molybdenite
Results for molybdenite in the absence and presence of
Orfom ® D8 are also shown in Figure 6. By comparison,
untreated molybdenite shown in red exhibits a slight
400 900 1400 1900
Wave Number (cm-1)
CuFeS2 +KEX
CuFeS2 +KEK +D8
Figure 4. FT-IR of Chalcopyrite with KEX and Orfom® D8
400 900 1400 1900
Wave Number (cm-1)
MoMRMo
MoMR +D8 Mo +
Figure 5. FT-IR of Molybdenite with and without Orfom® D8
Transmittance(%) 1033.84
1124.49
1199.79
1265.03
1035.77
1124.49
1197.79
Transmitan
(%)468.70
781.17 1093.63
468.70
781.17 1093.63