A new type of coarse particle flotation machine for rough grinding and flotation in mines

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 Coarse ore flotation has always been one of the key technologies for mine coarse grinding and flotation to reduce energy consumption. An iron ore plant in Anhui Province has a very small content of mica in the iron ore of the first grinding product. Recovery value. However, there are generally two ways to recover mica at present: one is coarse-grained regrind and reselection; the other is to choose equipment suitable for coarse-grained mineral flotation. However, during the inspection of the production site, it was found that many of the mica minerals in the second-stage grinding products in this iron ore did not meet the particle size requirements of flotation, and the density of mica was small, and most of them showed flaky structure. The overflow of the cyclone ran out, causing the inspection and screening operation to be blocked first, so regrinding is not suitable for the recovery of coarse mica.

    The design principle of coarse-grained flotation machine is that coarse-grained minerals are prone to sinking grooves and poor selection indicators during the flotation process. On the basis of conventional flotation machines, the following principles will be followed for design (1 ) U-shaped groove bottom is used to reduce dead angles and avoid mineral sinks; (2) Large impellers and low speed drive are used to reduce the turbulence intensity of the slurry, which is conducive to the floating of coarse particles; (3) Equipped with larger At best, relatively many bubbles are formed, which can help attach and carry large particles to float; (4) Reduce the overflow strength of the bottom of the tank, shorten the rising distance of mineralized bubbles, reduce the interference of external forces and the roughness of the bubbles (5) Stabilize the separation zone and the surface of the slurry to ensure that the foam adsorbing minerals flows smoothly into the foam tank.

The structure design of the coarse particle flotation machine:

(1) Impeller and stator.

According to the fluid dynamics design theory, the impeller design of the flotation machine adopts a shape that is relatively similar to the impeller of a high specific speed pump. The tangentially rotating ore flow it produces is conducive to the suspension of minerals, the dispersion of air, and the selection index. improve. The stator must be able to convert the tangentially rotating slurry flow generated by the impeller into a radial slurry flow, and lift the coarse materials and dense minerals to the upper part of the tank, so that the mineral particles can be effectively suspended in the flotation tank. The contact probability of large mineral particles with bubbles increases the possibility of separation of coarse minerals and heavy particles.

(2) Impeller height

The height of the impeller from the bottom of the tank is related to the structural parameters of the flotation machine, the concentration of the slurry, and the composition of the particles. The greater the height, the easier it is to start the flotation machine, but it is easy to cause the sinking tank of the ore particles in the tank and the fluctuation of the slurry surface. Lower the height, the mineral particles are not easy to sink, but the suspended state is easily destroyed, the phenomenon of stratification occurs, and the flotation conditions are deteriorated. The appropriate height of the impeller from the bottom of the groove can be determined through experiments.

(3) Regulating device at best

The aeration volume of the flotation machine varies with the different minerals, and the selection index of some minerals is very sensitive at best. Therefore, we have designed a stepless speed regulation device at best to realize the fine adjustment of the aeration volume, so that the right amount of low-pressure air is evenly dispersed in the entire flotation tank to ensure that the non-floating mineral particles and mineralized bubbles in the upper separation zone of the tank body Separate.

According to the hydrogeological conditions of the wellbore project, the freezing method can be adopted for construction, short-section digging and building, rolling shift operation system, implementation of mechanized comprehensive supporting operation lines, multi-process parallel and intersecting operations, reducing auxiliary operation time, improving work efficiency, and fully Mobilizing the enthusiasm of employees has enabled the wellbore to break through the 100-meter mark for several consecutive months, achieving the goal of high-quality and efficient work.

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