A new technology of high-efficiency concentration of ore slurry--filter thickener

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 Most of the current thickening equipment is based on rake thickeners. The rake thickeners use the principle of gravity sedimentation to achieve concentration and clarification. This can be widely used in washing water clarification and other links, but with mechanization Continuous popularity and progress. The concentration efficiency of equipment using the sedimentation principle will be greatly reduced, which will cause the overflow concentration to exceed the standard and affect normal production. Therefore, in this case, we have to further carry out a necessary study on the principle of suspension and sedimentation and the enrichment equipment.

Under such circumstances, a new type of filter thickener that uses the principle of pressure filtration to achieve the old high-efficiency slurry thickener is proposed. Compared with the gravity sedimentation thickener, the filter thickener has the advantages of fast concentration speed, high concentration efficiency, quick concentration adjustment, and small volume. The structure of the filter thickener is mainly composed of two parts: an external static body and an internal filter rotor component. The external static body is composed of a central cylindrical section and two upper and lower conical sections. The cylindrical section is the main area for concentration operations. ; The filter rotor component is composed of a filter drum in the middle and two upper and lower rotating shafts. The lower rotating shaft is a hollow shaft, which is used to discharge the clarified liquid.

The filter thickener is a new type of technology that can use the principle of pressure filtration to achieve high-efficiency thickening of the slurry. Its working principle is: the slurry is fed into the filter thickener along the tangential direction through the feed pipe at a certain pressure. , Under the combined action of gravity, the top-down rotating movement is carried out; when the slurry flows through the filter area, the pressure of the slurry is used to form a filter cake on the outer wall of the filter rotor, and the permeable liquid will be collected through the filter medium To the inside of the filter rotor, the material is discharged from the outlet; the sediment on the filter medium is washed by centrifugal force and liquid flow. Under the action of disturbance, the slurry is mixed into the slurry to form a concentrate and discharged from the discharge port, thereby completing the filtration and concentration process of the slurry.

In addition, research shows that the pressure field distribution law of the filter thickener is more consistent with the theoretical expected results, so the research results are credible; the drum speed has a direct impact on the pressure of the flow field, so in the actual application process It is possible to use the adjustment effect of the rotating drum speed on the smooth pressure to change the concentration effect of the thickener, and realize more rapid adjustment; there is a certain pressure drop on both sides of the drum wall, and the outer pressure value is greater than the inner pressure value. The guarantee for the realization of the filtration and concentration process; in the actual production process, the diameter of the critical equivalent pressure loop should be smaller than the diameter of the drum, so we should reasonably choose the mixing ratio of the inlet pressure and the drum speed to make The flow field filtration process can proceed smoothly, so that the concentration and clarification operation can be completed.

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