1948 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
better carbon recovery can be obtained with a finer feed
size.
Floatation of –25 micron BFD. A similar study
was conducted to examine the flotation behaviour of –25
micron feed size. The results are presented in Figure 10–11.
It was observed that increasing the dosage of the collector
results in a more stable froth generation. However, beyond a
certain point, iron particles also get trapped with the froth,
leading to a decrease in FC and an increase in Fe grade.
The optimal yield was achieved with a collector dosage of
400 CC/ton, which resulted in a yield of 22.3%, an FC of
51.2%, and an iron content of 19.6%. Based on the above
discussion, it is recommended that the collector amount be
optimized at 400CC/ton.
Effect of Feed Size
The graph in Figure 12 presents the impact of size on froth
concentrate yield with varying collector dosages. It shows
that the yield is consistently higher with particles of –25
micron size, and lowest with particles of –75 micron size.
Therefore, it can be inferred that grinding BFD to a size of
–25 micron effectively liberates the particles. The optimum
collector dosage amount was estimated to be at 400CC/ton
concerning maximum carbon recovery and minimum iron
entrapment in froth concentrate.
Effect of Frother Dosage
It has been observed that increasing the amount of frother
used to 150 CC per ton and collector 1000CC/Ton of
frother results in an increase in the yield of product froth,
without significant variation in the iron content of the
froth. However, beyond 150 CC per ton of frother dos-
age, the ash content increases, leading to a decrease in the
fixed carbon in the froth. Additionally, the iron content in
the froth also increases, which is undesirable. Therefore,
the optimal dosage of frother MIBC is determined to be
150 CC per ton.
Optimized reagent dosages for iron and carbon
recovery: Collector: 400CC/ton Frother: 150CC/ton
Depressant: 100gm/ton.
Effect of Low Intensity Magnetic Separation
The tailing sample of froth floatation was subjected to Low
intensity wet magnetic separation. The magnetic concen-
trate are characterized by iron grade FeT and FeO. FeO rep-
resents Fe+2 ion which corresponds to magnetite portion
in the material. LIMS results reveal that only little portion
in the feed sample are highly magnetic which are suscep-
tible to low intensity magnetic field i.e., 1500 gauss. with
increase in the feed size magnetic yield is increasing how-
ever the FeO content decreases which indicates that gangue
Figure 10. Effect of collector dosage on floatation froth characteristic for –25 micron feed sample
better carbon recovery can be obtained with a finer feed
size.
Floatation of –25 micron BFD. A similar study
was conducted to examine the flotation behaviour of –25
micron feed size. The results are presented in Figure 10–11.
It was observed that increasing the dosage of the collector
results in a more stable froth generation. However, beyond a
certain point, iron particles also get trapped with the froth,
leading to a decrease in FC and an increase in Fe grade.
The optimal yield was achieved with a collector dosage of
400 CC/ton, which resulted in a yield of 22.3%, an FC of
51.2%, and an iron content of 19.6%. Based on the above
discussion, it is recommended that the collector amount be
optimized at 400CC/ton.
Effect of Feed Size
The graph in Figure 12 presents the impact of size on froth
concentrate yield with varying collector dosages. It shows
that the yield is consistently higher with particles of –25
micron size, and lowest with particles of –75 micron size.
Therefore, it can be inferred that grinding BFD to a size of
–25 micron effectively liberates the particles. The optimum
collector dosage amount was estimated to be at 400CC/ton
concerning maximum carbon recovery and minimum iron
entrapment in froth concentrate.
Effect of Frother Dosage
It has been observed that increasing the amount of frother
used to 150 CC per ton and collector 1000CC/Ton of
frother results in an increase in the yield of product froth,
without significant variation in the iron content of the
froth. However, beyond 150 CC per ton of frother dos-
age, the ash content increases, leading to a decrease in the
fixed carbon in the froth. Additionally, the iron content in
the froth also increases, which is undesirable. Therefore,
the optimal dosage of frother MIBC is determined to be
150 CC per ton.
Optimized reagent dosages for iron and carbon
recovery: Collector: 400CC/ton Frother: 150CC/ton
Depressant: 100gm/ton.
Effect of Low Intensity Magnetic Separation
The tailing sample of froth floatation was subjected to Low
intensity wet magnetic separation. The magnetic concen-
trate are characterized by iron grade FeT and FeO. FeO rep-
resents Fe+2 ion which corresponds to magnetite portion
in the material. LIMS results reveal that only little portion
in the feed sample are highly magnetic which are suscep-
tible to low intensity magnetic field i.e., 1500 gauss. with
increase in the feed size magnetic yield is increasing how-
ever the FeO content decreases which indicates that gangue
Figure 10. Effect of collector dosage on floatation froth characteristic for –25 micron feed sample