(1) The surface energy of the fine particles is large, and under certain strips, fine particles of different compositions form non-selective condensation. The agglomeration caused by the surface force also causes the adhesion of the fine particles on the surface of the coarse particles to form fine particle coverage. (2) The fine particles have a large specific surface area and surface energy, so they have a high drug adsorption capacity, and the adsorption selectivity is poor; the surface solubility increases, which makes the "inevitable ions" increase in the slurry; at the same time, the fine particles are small in mass, It is easily entrained by the water flow machine and mechanically entrained by the foam. (3) The adhesion efficiency between the fine particles and the bubbles is relatively low, so that the bubble-to-particle capture rate is lowered, and the fine particles are also attached to the surface of the bubble in a large amount, forming a so-called "armor" phenomenon of the bubbles, which affects the carrying amount of the bubbles. Main measures to enhance fine particle flotation in production: (1) Adding a dispersing agent to prevent the fine particles from coagulating and ensuring sufficient dispersion. Common dispersants are sodium silicate, sodium polyphosphate, sodium hydroxide (or sodium carbonate), and water glass. (2) Reduce the concentration of the slurry and increase the selectivity. When the pulp is thinner, the fine mud can be prevented from contaminating the concentrate foam, and the viscosity of the slurry can also be reduced. (3) Sub-group and batch dosing to reduce non-selective adsorption. Avoid adding once and being absorbed by the slime. (4) Desliming the treated materials before flotation, sediment sorting, and specially formulating the flotation of the slime.
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The main reason why fine particles are difficult to float: