Sedimentation tank

The sedimentation tanks for intermittent work are usually rectangular concrete tanks, which are placed outside the plant and use most of the natural sedimentation of the materials to remove most of the water. The slurry is fed from one end of the tank and the clarified water overflows from the other end. The bottom of the pool is maintained at a 1% slope. It is generally set up in parallel by four pools. The slurry is fed into the first tank, and after filling, the second and third pools are injected. After a pool is filled, the feed is stopped and the natural settling is allowed to stand. The sediment deposit at the feed end of the sedimentation tank is the thickest, and it can almost touch the liquid surface. After that, the sediment accumulation moves forward, and when the sediment accumulates to the overflow end for a certain length (with the overflow constant mixing degree) Bay II stops feeding. At this time, there is overflow water at the end of the pool, so that it settles and settles. After the liquid surface is clarified, the sluice is sequentially opened to discharge the clean water. After the precipitate is properly allowed to stand and then a part of the water is oozing out, the discharge can be removed. Among the four pools, the first feed, the second precipitation, the third clearing, the fourth preparation, and recycling.
The sedimentation tank can be used for electric picks, grab cranes or manual removal of sediment. The rails are laid at the bottom of the pool, and the bottom of the pool can be protected from being hit by a bucket or grab. At one end of the tank, a suitable open space may be reserved for temporary storage of sediment; the other end of the tank preferably has a road through to deposit the sediment directly into the mine car.
Sedimentation tanks are widely used in selected coal plants and small-scale beneficiation plant for dewatering fine materials use. Its calculation method is as follows:
The time of a working cycle of the sedimentation tank:
t=t ₁ +t ₂ +t ₃ (1)
Where t———cycle time, h;
t ₁ ———The time required for the sedimentation tank to fill the slurry, h;
t ₂ — the time required for the sediment to settle for deposition, h;
t ₃ ———The time required for the sediment to be removed, h.
Total volume of sedimentation tank:
V=Q · t (2)
Where V———total volume, m ³ ;
Q———The amount of slurry in the process of the concentrator, m ³ /h;
t———Work cycle time, h.
Total length of the pool: L=L ₁ +L ₂ (3)

Where L ₁ ———the length determined by the amount of pulp and the volume of the required pool, m;
L ₂ ———The working length of the sedimentation tank overflow å ° is not filled with material, m;
B———the width of the sedimentation tank, generally 6～9m;
Ï… ₀ ———The final sedimentation velocity of the largest solid particle in the overflow, m/s. Measured or calculated according to formula (1). [next]
The depth of the sedimentation tank needs to be easy to excavate the sediment, generally 2.5 to 3.5 meters. The structure of the sedimentation tank is shown in Figures 1 and 2.

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