The difference between coarse and fine selection in flotation machines

Flotation machine is the abbreviation of floating concentrator, which is used for foam flotation. Mainly used for selecting non-ferrous metals such as copper, zinc, lead, nickel, gold, etc., it can also be used for the rough selection and selection of non-metallic materials such as coal, limestone, and talc powder.
During flotation, minerals not only require sufficient monomer decomposition, but also appropriate particle size selection. The minerals are too thick. Even if the minerals have been decomposed into monomer, they often cannot float because they exceed the loading capacity of foam. The upper limit of flotation particle size for various minerals varies. For example, sulfide minerals are generally 0.2-0.25mm, and non sulfide minerals are 0.25-0.3mm. For non-metallic minerals with low density, such as coal, the upper limit of particle size can also be increased. However, grinding particles with a size too small (e.g. less than 0.01 millimeters) is also detrimental to flotation. Practice has proven that there are differences in flotation behavior among different particle sizes. Different minerals have their own flotation particle size range. The flotation machine

Based on the dissolution of mining groups, rough grinding stone flotation can save grinding stone costs and reduce beneficiation costs. When dealing with uneven embedded ore and large porphyry copper deposits, while ensuring the recovery rate of coarse selection, the rough grinding tends to be more abundant. However, because the coarse ore is relatively heavy, it is not easy to float in the flotation machine, and the probability of collision with foam is reduced. After bubbles are attached, the falling force is high and it is easy to escape. Therefore, the flotation effect of coarse ore is not good under general process conditions. In order to improve the flotation of coarse particles, the following special process conditions can be adopted:

Practice has proved that the strong turbulence movement of pulp in the mechanical agitation flotation machine is the main factor that causes light particles to fall off from the foam. Therefore, reducing the turbulence intensity of square movement is the fundamental measure to ensure the flotation of rough particles.

1. Choose specialized flotation devices suitable for coarse particle damage. Improve and adjust the structure and operation of the ordinary flotation machine, properly reduce the cell depth (use shallow cell type), reduce the float distance of the photochemical gun, so that the photochemical bubble can not be dropped, add a grid above the impeller area, reduce the turbulence intensity in the square, keep the foam area stable, increase the expansion, and form more large bubbles, which helps to form a continuous composition of foam and optical particles, and form coarse particles. The flotation machine

2. Increase the pulp concentration appropriately and improve the chemical system. Objective To select a collecting agent with strong collecting power, reasonably increase the concentration of the agent, improve the fixation strength of minerals and foam, increase the rising speed, and supplement non-polar oil. Auxiliary collectors such as diesel oil and kerosene can "consolidate" the surrounding of three-phase contact and improve the fixation strength of minerals and foam.

Understanding the working principle of flotation machines is of great help to daily production, mainly by greatly reducing the failure rate of flotation machines and extending their lifespan.

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