2560 XXXI International Mineral Processing Congress 2024 Proceedings/Washington, DC/Sep 29–Oct 3
Batch Flotation
From the batch flotation results, the choice of colloidal sil-
ica dispersion that will be used for pilot and industrial scale
depends on two criteria: The effect on the scheelite-calcite
selectivity index and the economic viability. Figure 6 shows
the effect of colloidal silica dosage on the target variable
scheelite-calcite selectivity index for the different colloidal
silica dispersions. It is obvious that the aluminate-modified
colloidal silica with a specific surface area of 1100 m2/g has
the most important effect at a dosage of 550 g/t.
Fortunately, this colloidal silica dispersion is the cheap-
est, as shown in Table 5 which illustrates the price estimates
for different colloidal silica dispersions provided by the
reagent manufacturer Nouryon ®.
Figure 5. Single-mineral flotation recoveries of calcite and scheelite depending on colloidal silica dosage (at pH =8, collector
=1 × 10–3 M sodium oleate, specific surface area 500 m2/g)
Figure 6. Effects on scheelite-calcite selectivity index of colloidal silica dosage in
comparison to blank tests for seven types of colloidal silica suspensions according to the
experimental design in Table 2
Batch Flotation
From the batch flotation results, the choice of colloidal sil-
ica dispersion that will be used for pilot and industrial scale
depends on two criteria: The effect on the scheelite-calcite
selectivity index and the economic viability. Figure 6 shows
the effect of colloidal silica dosage on the target variable
scheelite-calcite selectivity index for the different colloidal
silica dispersions. It is obvious that the aluminate-modified
colloidal silica with a specific surface area of 1100 m2/g has
the most important effect at a dosage of 550 g/t.
Fortunately, this colloidal silica dispersion is the cheap-
est, as shown in Table 5 which illustrates the price estimates
for different colloidal silica dispersions provided by the
reagent manufacturer Nouryon ®.
Figure 5. Single-mineral flotation recoveries of calcite and scheelite depending on colloidal silica dosage (at pH =8, collector
=1 × 10–3 M sodium oleate, specific surface area 500 m2/g)
Figure 6. Effects on scheelite-calcite selectivity index of colloidal silica dosage in
comparison to blank tests for seven types of colloidal silica suspensions according to the
experimental design in Table 2