One of the most important methods in flotation technology is to observe the foam in the flotation machine and judge the quality of the flotation according to the change of the foam.

Experienced flotation machine operators can determine the cause of the change by observing the various changes in the apparent phenomenon of the foam, so as to ensure that the flotation process is carried out under optimal conditions.

Whether the flotation worker can correctly adjust the flotation agent addition amount, the concentrate scraping amount and the medium ore circulation amount depends on his correctness in judging the appearance of the flotation foam, and the ability to observe and judge is mainly from Continuous and serious summary of operational experience gained. The appearance of flotation foam includes the foam's virtual, size, color, luster, shape, thickness, strength, fluidity, sound, etc. These phenomena are mainly caused by the type, quantity, particle size, color, gloss and density of the minerals attached to the surface of the foam. , the amount of foaming agent and so on.

1. The virtual and real foam: the mineral particles attached to the surface of the bubble are dense and dense, and the foam is solid. The surface of the bubble is less and thin, the foam is imaginary, the ore grade is high, the dosage of the agent is appropriate, the foam is real, the inhibitor is excessive, and the foam is too small when the collector is too small;

2, the size of the foam: the size of the bubble on the surface of the foam layer, often with the nature of the ore, the pharmaceutical system and the area of ​​flotation;

3, color: the darker the color scan selection suspended minerals, metal greater the loss, the deeper the color of the mineral coarse floating selection area, the better the quality of the concentrate;

4. Gloss: The rough selection of flotation sulfide minerals, the mineralization of the foam in the selected area is good, the metal luster is strong, and the foam mineralization in the sweeping area is poor, showing the glass luster of the water film. If the semi-metallic luster appears in the sweeping foam, the metal loss is large;

5. Contour: When the foam mineralized by the medium hydrophobic mineral grain is formed on the surface of the slurry, the water is sufficient, the contour of each bubble is relatively clear, the foam stays on the slurry surface for a long time, the mineral is hydrophobic, and the bubble wall is dry. After the defect, the bubble outline is blurred;

6. Thickness and thinness: The thickness of the foam layer is mainly related to the amount of foaming agent and the degree of bubble mineralization. There are many foaming agents, high ore grade, high concentration, good mineralization, and the foam layer is generally thick. It is relatively thin, the floating mineral ore is too thick, and it is difficult to form a thick foam layer. The beneficiation surface of the selected area is low, the foam layer is thick, the concentrate grade is high, the sweeping area keeps the pulp surface high, and the floating mineral can be scraped out in time. The layer is thinner and the recovery rate is high;

7. Brittleness and viscosity: The brittleness of the foam is too large, the stability is poor, it is easy to break, and sometimes it can't be scraped. On the contrary, the foam is too viscous and too stable, which will cause the flotation machine to “run the trough” and destroy the normal flotation process, resulting in concentrate transport difficulties, excess foaming agents, fall oil or ore slime and a large amount of lead sulfate and other soluble salts, can be excessively stable foam;

8. Sound: When the foam is scraped into the foam tank by the scraper, it emits a “sand” sound. It is often a foam containing a large amount of minerals with a large specific gravity and a coarse particle size.

The above eight points are the flotation techniques for judging the flotation effect. The appearance of the foam varies with the flotation area, but specific areas often have specific phenomena. Observing the foam situation should capture several flotation tanks with obvious characteristics that have a major impact on concentrate grade and recovery rate, mainly including: final concentrate flotation tank, several flotation tanks before operation, and each float Select the flotation tank and sweep the tail flotation tank.

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