Choice range of inclination angle of thickener

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When the tilt angle is 50 degrees, the concentration efficiency is the highest, and as the tilt angle continues to decrease, the concentration efficiency will gradually increase. When the angle is too low, the concentration efficiency will decrease instead.

The thickening equipment is the source of the water clarification process in the coal preparation plant. The angle of the inclined plate of the inclined plate thickener has a great influence on the efficiency of the thickener. The inclined plate thickener has a bottom feed, and the type of feed is heterogeneous, so it is inclined The angle should be kept between 45-60 degrees, so the test is carried out.

During the test, an inclined plate was added to the ordinary thickener. The inclined plate uses stainless steel bolts to connect the right-click glass plates of different sizes at different angles to form a combination of inclined plates with different inclination angles. At this time, 200g of the well-mixed raw materials can be taken out for a small sieving test to find out the particle size composition. Among them, the 0.045m material content is the highest, indicating that the high ash fine mud content in the coal slime is very high, which has a greater impact on concentration.

The main components of coal slime are kaolinite and illite, as well as a small amount of minerals such as quartz, feldspar and calcite. The two minerals with relatively high content are clay minerals, which will swell when exposed to water and form very fine colloids. , Not easy to settle.

The inclined plate thickener is bottom feeding, and the feeding type is a different flow. Therefore, the range of inclination angles will be about 45~60 degrees. The inclination angles of the inclined plate are selected as 60, 55, 50, and 45 for the test. The results show Because the material is fed at the bottom and the opposite flow enters the inclined plate, taking into account the projected area of ​​the inclined plate and the two factors of discharging, it is more appropriate to choose an angle within the range of 45 to 60 degrees. When you select 60 degrees for the first time, you will find that the inclination angle decreases, and the underflow solids content will increase. Because the projected area increases, the sedimentation area will increase, and the concentration efficiency will increase. When the water flow is non-directional, the particle distribution will be coarse particles in the lower layer and fine particles in the upper layer, which is more conducive to product discharge, but if the fine particles are suspended for too long, they will be lifted away. But when it is at 45 degrees, due to the above reasons, the number of fine particles taken away will increase, the content of overflow solids will increase, and the small efficiency of concentration will decrease instead.

The inclined plate thickener is fed at the bottom, and the type of feeding is heterocurrent, so the selection range of the inclination angle will probably be between 45 and 60 degrees to facilitate the decline of the material; the flow rate is maintained at 2.6 cubic meters per hour, and the concentration It is 50 grams per liter. The test results show that the concentration efficiency is the highest when the tilt angle is 50 degrees. As the inclination angle becomes smaller, the concentration efficiency will gradually increase, but when the angle is too small, the particles in the upper layer will be taken away more and the concentration efficiency will decrease instead.


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