Inclined plate concentrating box (1)

Tilt plate is concentrated boxes at home and abroad in the 1960s it developed a highly efficient fines dewatering equipment, mainly used in water treatment, chemical, metallurgy, coal industry. The tank body is small, the floor space is small, and the investment is small, but generally the flocculant is added to the slurry. Some Chinese mineral processing plant re-election with its fine product dehydration. The equipment has poor dewatering effect on the flotation product, and the inclined plate gap is easy to be blocked, and often only functions as a chute.

The outer casing of the sloping plate concentrating box is made of thin steel plate. The upper box is a parallelepiped. The concentrating plate and the stabilizing plate are arranged in the vertical direction of the tank and the flow. The lower box is a conical funnel for collecting solid materials (sand). ,As shown in Figure 1. In operation, the slurry is uniformly fed between the concentrating plate and the stabilizing plate by the feed pipe along the width of the feed opening. The overflow flows through the overflow weir to the manifold. The grit is deposited from the concentrating plate and slides downward, and is deposited into the conical box through the stabilizing plate and discharged from the discharge pipe. The water content of the grit can be adjusted by means of gate valves or discharge pipes of different diameters. Since the tank is equipped with a plurality of concentrating plates of about 150 mm apart, the settling time and distance of the slime are effectively shortened, and the effective concentrated area is greatly increased. Therefore, the processing capacity and concentration efficiency per unit area of ​​the inclined plate concentrating tank are much higher than those of other concentrating equipment such as ordinary concentrators and split hoppers. The effective settlement area can be calculated as follows:

Where A———effective settlement area, m ² ;
b———the width of the concentrating plate, m;
L———the length of the concentrating plate, m;
Z————the number of concentrating plates, (block);
a———The smelting plate is inclined and degrees.
The production capacity of the inclined plate concentrating tank according to the overflow meter is:
Q=0.7 · Ï… ₀ · A (2)
Where Q—the volume of the overflow solution, m ³ /s;
Ï… ₀ ———The maximum particle free settlement speed in the overflow, m/s;[next]
The processing capacity of the sloping plate concentrating tank is related to the spacing, inclination, length of the slab, the rising speed of the slurry, the material and the nature and operation of the material to be treated. The optimum parameters must be obtained through experiments.
(1) The pitch W of the two inclined plates is as shown in FIG.
The plate spacing W has a great influence on the sedimentation separation effect. When the plate spacing is small and the production capacity is the same, the height of the sedimentation separation device is small. The plate spacing is small, and the same horizontal projection area can accommodate a larger number of inclined plates, which is advantageous for settlement separation. However, if the plate spacing is too small, the surface friction on the inclined plate will obviously hinder the material that has fallen on the plate from sliding down. In addition, the separation effect is reduced due to the influence of turbulence of the liquid flow. So W is bigger than 10 mm. When the feed concentration is high, or when the material is fine and sticky, the plate spacing should be larger. For example, when the slime is treated in Japan, the plate spacing is 50 mm. White silver dressing plant of 4000 × 4000 mm using an inclined plate separator tank, using a total of 80 mm from the plate.
(2) The inclination of the inclined plate. The angle a of the inclined plate is an important parameter affecting the separation effect. The smaller the value of a, the shorter the material settlement distance. When a is within a certain range, reducing a is advantageous for accelerated separation. However, when the inclination angle is reduced beyond a certain range, the relative sedimentation speed of the particles to be separated is reduced. And the angle a is too small, it will not be conducive to the decline of materials that have fallen on the inclined plate surface, affecting the convection of light and heavy materials. Therefore, the angle a should be satisfied: 1) the material settlement distance is as short as possible; 2) the material that has fallen on the inclined plate surface can slide down smoothly; 3) the velocity distribution of the total overflow (Fig. 3) is most advantageous.
(3) The material of the inclined plate. The main application of the sloping plate concentrating equipment is the material processing of the inclined plate. Material requirements: 1) have sufficient strength, light weight, low cost, no toxicity; 2) smooth surface; 3) hydrophobic; 4) chemically stable. Commonly used materials are ordinary thick glass plate, tempered glass plate, hard plastic plate, celluloid plate, steel plate coated epoxy resin, essence board, paper board, asbestos cement board, plastic veneer board, waterproof wood chip board, enamel board and glass steel Wait.

(4) The effective length of the inclined plate. The sedimentation velocity analysis of the particles between the inclined plates is shown in Fig. 2. When the particle d _p falls from point A to point B, the separation work is considered complete. Therefore, the length of the inclined plate should satisfy:
L _min =υ _d · t _F
Since the sedimentation distance of the particles is h,

Where L _min ———the effective length of the inclined plate, mm, considering the influence of turbulence, the real length of the inclined plate is equal to 1.3 of the effective length
Times
υ _d — — the velocity of the ascending stream, mm/s; determined by the test;
υ——— The relative sedimentation velocity of the particles of the concentrated material, mm/s, determined by the sedimentation test. When testing unconditionally,
Can also be approximated by the Stokes formula;
a———the inclination of the inclined plate, degree;
W———the distance between the inclined plates, mm;
t _F ———the relative settling time of the particles to be separated d _p particles, s.

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