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Factors affecting bubble mineralization

The process by which particles adhere to a bubble during flotation is called mineralization of the bubble. In the process of bubble mineralization, the hydrophobic particles on the surface are preferentially attached to the bubbles, forming a combination of bubbles and agglomerates; the hydrophilic particles on the surface are difficult to adhere to the bubbles, even if they are likely to adhere. That is, the bubble mineralization process is selective. However, in addition to the effect of particle surface wettability on bubble mineralization, the physical properties of the particles (such as particle size, density, shape, state of charge, etc.) and the fluid dynamics in the flotation cell are all related to the bubble. Mineralization has an impact, as shown in Figure 4-6-32.

(1) Factors affecting bubble mineralization

The flotation process can be divided into four stages: the first is the contact stage, the ore is close to the bubble in the flowing pulp at a certain speed, and is in collision contact; the second is the adhesion stage, the surface is hydrophobic after the ore is in contact with the bubble. The hydration layer between the ore particles and the bubbles gradually thins and ruptures, forming a three-phase contact periphery between the gas, solid and liquid three phases to achieve the adhesion of the ore particles and the bubbles; the third is the rising and floating phase, and the adhesion The bubbles of the ore particles (ie, mineralized bubbles) form a combination of ore bubbles between them, and enter the foam layer under the action of buoyancy on the bubbles; the fourth is the foam layer formation stage, finally forming a stable foam layer, and scraping in time . Whether the hydrophobic ore particles can float as concentrates during the froth flotation process depends on the progress of these four stages. If each stage is in good condition, you will get a satisfactory flotation result. When flotation, the total probability of whether the ore particles can rise is determined by the probability of the above four sub-processes, namely:

Collision probability, sticking probability in the sticking stage, probability of non-shedding in the ascending and floating stages, and stability probability in the foam layer forming stage.

Pe is related to the diameter of the bubble, the diameter of the ore, the state of the water flow, and the concentration of the slurry. Whether the ore particles and bubbles can adhere, that is, the size of Pa is related to the degree of hydrophobicity of the surface of the ore particles, the collision speed and the collision angle of the bubbles with the ore particles. Pn is closely related to the firmness of the adhesion of the bubbles to the ore particles. Pn is affected by the adhesion area of ​​bubbles and ore particles, the lifting force of the bubbles to the ore particles, the speed of the pulp movement and the degree of interference of other ore particles. Ps is mainly affected by the bubble life and the degree of adhesion of the bubbles to the ore particles. In order to increase the total probability of bubble and ore particle attachment, the probability of four sub-processes must be increased to facilitate the flotation process.

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