The thickener is a solid-liquid separation device based on the nominal action of gravity, usually a coaxial shallow groove with a conical bottom built-in with concrete, wood or metal welded plate as the structural material. The slurry with a solid content of 10%～20% can be concentrated by gravity sedimentation into an underflow slurry with a solid content of 45%～55%, and it can be installed in the thickener to run slowly (1/3～1/5r/min ) The role of the rake makes the thickened underflow slurry discharged from the underflow opening at the bottom of the thickener.
Thickeners are widely used in hydrometallurgy, mineral processing plants, chemical plants and other production sites that require solid-liquid enrichment and separation, with a diameter of 3-100m and a depth of 2-4m.
(1) Increase the degassing tank to attach the solid particles to the bubbles, like a "parachute" insertion phenomenon.
(2) The feed pipe is located below the liquid level to prevent gas from being brought in during feed.
(3) The feeding sleeve is moved down, and there is a receiving pan to make the feeding slurry fall evenly and steadily, effectively preventing the phenomenon of turning over caused by the residual pressure of the mine;
(4) The internal overflow weir is added to make the material flow according to the prescribed stroke and prevent the phenomenon of "short circuit";
(5) The overflow weir is changed into a sawtooth shape, which improves the suction phenomenon of local drainage caused by the non-level overflow weir;
(6) The shape of the rake teeth is changed from a slanted line to a curvilinear shape, so that the slurry not only rakes toward the center, but also gives a "backlog" force toward the center, which makes the underflow concentration of ore discharge high, thereby increasing the processing capacity.
The advantages of the thickener are simple structure, convenient operation, low power consumption, and better technical indicators. The disadvantage is that it covers a large area and is not suitable for the thickening of coarse-grained materials, otherwise it is easy to block. In order to maintain the stability of the slurry sedimentation and concentration process, the speed of the rake designed according to the edge linear speed should not exceed 7-8m/min. For materials with coarser particles and easy to settle, the linear speed of the rake can be appropriately increased. If the size of the concentrated material is Especially thin, the linear speed of the rake should not be greater than 3~4m/min.
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