The flotation machine is the abbreviation of the floating concentrator and is the machine for making the flotation flotation. It is mainly used to select non-ferrous metals such as copper , zinc , lead , nickel and gold , and can also be used for rough selection and selection of non-metals such as coal fluorite and talc .
When flotation machine flotation, not only the minerals are required to dissociate sufficiently, but also the appropriate particle size is required. The ore is too thick, and even if the mineral has been dissociated from the monomer, it often cannot be floated because it exceeds the buoyancy of the bubble. The upper limit of flotation particle size of various minerals is different, such as 0.2-0.25 mm for sulfide minerals and 0.25-0.3 mm for non-sulfided minerals. For some non-metallic minerals such as coal with lower density, the upper limit of particle size can be increased. However, too fine a fine grain size (e.g., less than 0.01 mm) is also detrimental to flotation. Practice has shown that the flotation behavior of various granularities is different. Different minerals have their optimal flotation particle size range.
Under the premise of dissociation of the ore particles, coarse grinding flotation can save grinding costs and reduce beneficiation costs. In the treatment of unevenly embedded ore and large porphyry copper ore, under the premise of ensuring the crude recovery rate, there is a tendency to flotation after coarse grinding. However, since the coarser ore is relatively heavy, it is less likely to be suspended in the flotation machine, and the probability of collision with the bubble is reduced, and the adhesion force is large after the bubble is attached, and it is easy to fall off. Therefore, under the general process conditions, the coarse-grained ore particles have a poor flotation effect. In order to improve the flotation of coarse particles, the following special process conditions can be employed.
Practice has proved that the strong turbulent motion of the slurry in the mechanical agitation flotation machine is the main factor that causes the ore particles to fall off the bubble. Therefore, reducing the turbulence intensity of slurry movement is the fundamental measure to ensure coarse flotation.
1. Select a special flotation machine suitable for flotation coarse particles. Improve and adjust the structure and operation of the conventional flotation machine, appropriately reduce the groove depth (using the shallow groove type), shorten the floating path of the mineralized bubbles, so as to prevent the ore particles from falling off, and add a sieve above the impeller area to weaken the turbulent intensity of the slurry. Keeping the foam area stable, increasing the amount of aeration, forming more large bubbles, is conducive to the formation of floating clusters composed of bubbles and ore particles, and the coarse particles are "arched up" to float, and the foaming is quick and stable.
2. Appropriately increase the concentration of the slurry and improve the pharmaceutical system: select the collector with strong collecting power and increase the concentration of the agent reasonably, in order to enhance the fixation strength of minerals and bubbles, accelerate the rising speed, and supplement the non-polar oil. . For example, diesel, kerosene and other auxiliary collectors can “consolidate†the three-phase contact perimeter and enhance the anchoring strength of minerals and bubbles.
Understanding the working principle of the flotation machine is very helpful for daily production, which can greatly reduce the failure rate of the flotation machine and prolong the service life of the flotation machine.
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