728 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
presented in this paper were well within these acceptable
standard error limits.
Table 6 shows the varying conditions and reagent
dosages for batch flotation. Two dosages for each reagent
per experiment were investigated “L” denotes the lower
limit and “H” the higher limit. For ease of reference, this
experimental condition notation is consistently used in this
paper the first experimental condition listed in Table 6 is
referred to as “LLLL” for instance.
Sedimentation of Concentrates Post-flotation
Post-flotation, four concentrates, namely, C1, C2, C3
and C4 were collected, combined and split into 5 equal
amounts. This was achieved through stirring the bulk con-
centrate using an agitator at 2 rpm, drawing equal amounts
into 5 beakers using a syringe. Each beaker was labelled
for an experimental condition and corresponding dosage
as shown in Table 7. This approach was taken to see the
effect of the different reagents in their various combinations
when interacting with batch flotation residual reagents.
An H198703 nephelometer was used in conducting
the settling tests. Each beaker sample was agitated at 2 rpm
for 5 minutes after dosing. A sample was drawn using a
10 mL syringe and transferred into a cuvette. The cuvette
was subsequently shaken facing downwards for 10 seconds
before insertion into the nephelometer. The instrument’s
Nephelometric Turbidity Units (NTU) were recorded at 2
minutes and 30 seconds time intervals. The total duration
of the different reagent conditions is shown in Table 7.
RESULTS &DISCUSSION
Solids and Water Recoveries from the Batch
Flotation Process
The effect of varying reagent dosages on solids and water
recoveries is shown in Figure 1. In general, low process
water ionic strength resulted in both lower water and sol-
ids recoveries in comparison to high process water ionic
Table 5. Standard error for the solids and water recoveries.
Description Standard Error (%)
Permissible error in solids recovery 5
Permissible error in water recovery 10
Table 6. Experimental dosages for the batch flotation experiments
Condition Dosages
SIBX CMC Frother PW SIBX, g/ton CMC, g/ton Frother, g/ton PW
LLLL L L L L 50 0 40 1
LHLL L H L L 50 60 40 1
HLLL H L L L 150 0 40 1
HHLL H H L L 150 60 40 1
LLHL L L H L 50 0 60 1
LHHL L H H L 50 60 60 1
HLHL H L H L 150 0 60 1
HHHL H H H L 150 60 60 1
LLLH L L L H 50 0 40 10
LHLH L H L H 50 60 40 10
HLLH H L L H 150 0 40 10
HHLH H H L H 150 60 40 10
LLHH L L H H 50 0 60 10
LHHH L H H H 50 60 60 10
HLHH H L H H 150 0 60 10
HHHH H H H H 150 60 60 10
Table 7. Sedimentation conditions and dosages
Experimental
Condition Control Coagulant Flocculant
Coagulant and
Flocculant, Low
Coagulant and
Flocculant, High
Dosage (g/t) — 15 8 11.5 23
Duration (minutes) 30 30 15 15 15
presented in this paper were well within these acceptable
standard error limits.
Table 6 shows the varying conditions and reagent
dosages for batch flotation. Two dosages for each reagent
per experiment were investigated “L” denotes the lower
limit and “H” the higher limit. For ease of reference, this
experimental condition notation is consistently used in this
paper the first experimental condition listed in Table 6 is
referred to as “LLLL” for instance.
Sedimentation of Concentrates Post-flotation
Post-flotation, four concentrates, namely, C1, C2, C3
and C4 were collected, combined and split into 5 equal
amounts. This was achieved through stirring the bulk con-
centrate using an agitator at 2 rpm, drawing equal amounts
into 5 beakers using a syringe. Each beaker was labelled
for an experimental condition and corresponding dosage
as shown in Table 7. This approach was taken to see the
effect of the different reagents in their various combinations
when interacting with batch flotation residual reagents.
An H198703 nephelometer was used in conducting
the settling tests. Each beaker sample was agitated at 2 rpm
for 5 minutes after dosing. A sample was drawn using a
10 mL syringe and transferred into a cuvette. The cuvette
was subsequently shaken facing downwards for 10 seconds
before insertion into the nephelometer. The instrument’s
Nephelometric Turbidity Units (NTU) were recorded at 2
minutes and 30 seconds time intervals. The total duration
of the different reagent conditions is shown in Table 7.
RESULTS &DISCUSSION
Solids and Water Recoveries from the Batch
Flotation Process
The effect of varying reagent dosages on solids and water
recoveries is shown in Figure 1. In general, low process
water ionic strength resulted in both lower water and sol-
ids recoveries in comparison to high process water ionic
Table 5. Standard error for the solids and water recoveries.
Description Standard Error (%)
Permissible error in solids recovery 5
Permissible error in water recovery 10
Table 6. Experimental dosages for the batch flotation experiments
Condition Dosages
SIBX CMC Frother PW SIBX, g/ton CMC, g/ton Frother, g/ton PW
LLLL L L L L 50 0 40 1
LHLL L H L L 50 60 40 1
HLLL H L L L 150 0 40 1
HHLL H H L L 150 60 40 1
LLHL L L H L 50 0 60 1
LHHL L H H L 50 60 60 1
HLHL H L H L 150 0 60 1
HHHL H H H L 150 60 60 1
LLLH L L L H 50 0 40 10
LHLH L H L H 50 60 40 10
HLLH H L L H 150 0 40 10
HHLH H H L H 150 60 40 10
LLHH L L H H 50 0 60 10
LHHH L H H H 50 60 60 10
HLHH H L H H 150 0 60 10
HHHH H H H H 150 60 60 10
Table 7. Sedimentation conditions and dosages
Experimental
Condition Control Coagulant Flocculant
Coagulant and
Flocculant, Low
Coagulant and
Flocculant, High
Dosage (g/t) — 15 8 11.5 23
Duration (minutes) 30 30 15 15 15