(5) Determination of the ascending flow velocity in the inclined plate concentrating tank. When the inclined concentrating tank is working normally, the flow velocity Ï… d moving upward between the inclined plates shall not exceed the sedimentation velocity of the particles to be settled. Otherwise, the particles to be settled will not sink. The total liquid stream consists of a flowing liquid stream and a convective liquid stream. The flow velocity synthesis profile is shown in Figure 3.
If the flow velocity Ï… d is too large, the width and velocity of the absolute countercurrent (downflow) are small, so that the uppermost particles are deactivated, so that materials larger than a certain fraction are drawn into the absolute ascending flow. The highest value of the flow velocity Ï… D is the boundary between the inclined plate settling separation device for concentration and classification.
Ï… D can be measured with a flow meter (Figure 4). During the measurement, the flow rate of the slurry is continuously increased and the particle size of the particles is measured by a measuring instrument until the separation particle size desired by the sedimentation separator occurs. The overflow traffic, the test time and the cross-sectional area of the flow can be calculated the maximum flow velocity Ï… d when used for concentration should be less than Ï… d Ï… D;. When used for classification, using near or slightly greater than the value Ï… D Ï… D is actually a function of the tilt angle a. Therefore, the relationship between a and Ï… D can be measured. [next]
(6) Calculation of the effective concentrated area required:
1) According to the results of industrial tests or simulation tests.
2) When unconditionally conducting industrial or simulation tests, it can be calculated empirically:
In the formula A—the effective area of ​​the inclined plate concentrating tank to be used, m 2 ;
K———Safety factor, taking 1.05～1.20;
W ƒ ———The amount of overflow water in the concentrating tank, m 3 /s;
υ———Settling velocity of concentrate, m/s;
K 1 ———The rising water flow velocity coefficient of the inclined plate concentrating tank, that is, the multiple of the increased amount of the inclined plate after the treatment. The K 1 can be connected to the following formula.
n————The roughness coefficient of the board surface is generally 0.012～0.02. When there is sediment on the board surface, it is preferable, n=0.016
m———the number of inclined plates in the horizontal area of ​​the concentration tank, block/m 2 ;
δ——- sloping plate thickness, m;
a———The inclination of the inclined plate, degree.
According to the required settlement area and with reference to the test results of the inclined concentrating tank structural parameters, the reasonable structural form is selected.
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