Special flotation process and equipment (4)
The probability of particles colliding with bubbles:
P c =Sμ ∞ N
S= π R 2 (1+r/R) 2 E
Where μ ∞ — the relative velocity of the movement of particles and bubbles;N—the concentration of bubbles in the slurry;
S——— collision cross-sectional area;
r, R—the radius of the particles and bubbles;
E———Capturing coefficient of fluid mechanics.
The hydrodynamics capture coefficient increases with the increase of the size of the ore particles and decreases with the increase of the bubble size. The relationship between the velocity constant K and the particle size and bubble size is shown in FIG. This confirmed that the smaller bubbles have the best flotation ability.
The effect of bubble size on capillary detachment and adhesion surface is complicated. All in all, the use of smaller bubbles for larger floats is better, which helps to improve sorting efficiency. However, too small bubbles limit the lateral flow rate and thus limit the throughput of the device.
When the airflow speed is low, the sorting rate is slower, but the enrichment is higher. The air flow rate must be sufficient to maintain the desired height of the foam layer. The optimum gas supply rate is determined by the surfactant concentration and the life of the foam.
The foam layer height affects the enrichment ratio and separation efficiency. The foam layer height is determined by the nature of the material being sorted and the life of the foam layer. For transient foams, the extraction rate decreases as the foam layer height increases.
Dosing method Batch dosing is usually more efficient than dosing. For example, when complex cyanide is sorted with a cationic surfactant, only 5% of the surfactant is used to separate 290% of the complex cyanide when added to the surfactant three times.
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