A new technology of high-efficiency concentration of ore slurry--filter thickener

 Most of the current thickening equipment is based on rake thickeners. The rake thickeners use the principle of gravity sedimentation to achieve concentration and clarification. This can be widely used in washing water clarification and other links, but with mechanization Continuous popularity and progress. The concentration efficiency of equipment using the sedimentation principle will be greatly reduced, which will cause the overflow concentration to exceed the standard and affect normal production. Therefore, in this case, we have to further carry out a necessary study on the principle of suspension and sedimentation and the enrichment equipment.

Under such circumstances, a new type of filter thickener that uses the principle of pressure filtration to achieve the old high-efficiency slurry thickener is proposed. Compared with the gravity sedimentation thickener, the filter thickener has the advantages of fast concentration speed, high concentration efficiency, quick concentration adjustment, and small volume. The structure of the filter thickener is mainly composed of two parts: an external static body and an internal filter rotor component. The external static body is composed of a central cylindrical section and two upper and lower conical sections. The cylindrical section is the main area for concentration operations. ; The filter rotor component is composed of a filter drum in the middle and two upper and lower rotating shafts. The lower rotating shaft is a hollow shaft, which is used to discharge the clarified liquid.

The filter thickener is a new type of technology that can use the principle of pressure filtration to achieve high-efficiency thickening of the slurry. Its working principle is: the slurry is fed into the filter thickener along the tangential direction through the feed pipe at a certain pressure. , Under the combined action of gravity, the top-down rotating movement is carried out; when the slurry flows through the filter area, the pressure of the slurry is used to form a filter cake on the outer wall of the filter rotor, and the permeable liquid will be collected through the filter medium To the inside of the filter rotor, the material is discharged from the outlet; the sediment on the filter medium is washed by centrifugal force and liquid flow. Under the action of disturbance, the slurry is mixed into the slurry to form a concentrate and discharged from the discharge port, thereby completing the filtration and concentration process of the slurry.

In addition, research shows that the pressure field distribution law of the filter thickener is more consistent with the theoretical expected results, so the research results are credible; the drum speed has a direct impact on the pressure of the flow field, so in the actual application process It is possible to use the adjustment effect of the rotating drum speed on the smooth pressure to change the concentration effect of the thickener, and realize more rapid adjustment; there is a certain pressure drop on both sides of the drum wall, and the outer pressure value is greater than the inner pressure value. The guarantee for the realization of the filtration and concentration process; in the actual production process, the diameter of the critical equivalent pressure loop should be smaller than the diameter of the drum, so we should reasonably choose the mixing ratio of the inlet pressure and the drum speed to make The flow field filtration process can proceed smoothly, so that the concentration and clarification operation can be completed.

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Choice range of inclination angle of thickener

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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