Sludge dewatering machine for sand washing plant
After thorough mixing and reaction with coagulant, the sludge dewatering machine in the sand washing plant flows into the feed distributor of the concentration section, evenly distributing the sludge onto the inclined concentration section. Under the bi-directional guidance of the mud rake and the action of gravity, the sludge quickly removes its free water with the movement of the filter cloth. After gravity dewatering, the concentrated sludge is transported by a reversing mechanism to the gravity dewatering section of the belt press for further dewatering. Then it is fed into the "S" - shaped pressing section, where the sludge is sandwiched between the upper and lower layers of filter cloth. It is repeatedly pressed by several rollers of different diameters, causing the sludge cake to dehydrate again. The dry sludge cake is then scraped off by a scraper, and the upper and lower filter cloths are automatically cleaned continuously during operation.
In the first stage, pre-treatment stage, the solid content of the original slurry is generally low. Gravity settling or other methods are used to increase the slurry concentration to reduce processing costs. The commonly used pretreatment method is to mix the concentrated sludge with a polymer flocculant. Under the action of the flocculant, the material is agglomerated with fine particles and preliminarily precipitated. This is the preparation condition for sludge dewatering on the machine.
In the second stage, gravity dewatering is used to add the pre treated sludge to the filter belt. Under the action of gravity, free water outside the flocs is filtered out through the filter belt, reducing the moisture content of the sludge.
In the three-stage process, wedge-shaped pre pressure dewatering is carried out. After gravity dewatering, the sludge begins to enter the wedge-shaped pressing section, and the gap between the filter belts gradually narrows. Squeezing and shearing effects are applied to the sludge to dehydrate it again. After this stage, the fluidity of the sludge is almost completely lost, ensuring that the sludge will not be squeezed out in the squeezing and dewatering section under normal circumstances.
In the fourth stage, squeezing and dewatering, the sludge is repeatedly squeezed and sheared by a carefully designed squeezing roller system to remove a large amount of capillary water, gradually reducing the moisture content of the sludge and forming a sludge filter cake. At the separation point of the reselection filter belt, the filter cake is scraped off by the unloading scraper, and after unloading, the filter cloth is cleaned and enters the next cycle


Advantages:
1. Adopting advanced Austrian technology, the appearance is beautiful and generous.
2. High structural rigidity, smooth operation, and low noise.
3. Equipped with advanced concentration pretreatment equipment, it has good coagulation effect on sludge and low operating cost.
4. The gravity dehydration zone is equipped with advanced fabric feeders, which ensure uniform material distribution and extend the lifespan of the filter belt.
5. It has an ultra long gravity dehydration zone and a wedge-shaped dehydration zone, ensuring sufficient material dehydration and preventing material overflow during pressing.
6. The roller system is arranged in a scientific and orderly manner, with gravity dewatering, wedge dewatering, and press dewatering being discharged separately without interfering with each other. The diameter ratio of the press dewatering roller is large, resulting in good dewatering effect and high production capacity, which is energy-saving.
7. Continuous operation from feeding to discharging mud cake, with high degree of automation. PLC interface can be set up as needed for centralized control by microcomputer.
8. The power transmission machine adopts mechanical or variable frequency stepless speed regulation, with a large speed range and wide adaptability.
9. Equipped with a reliable backwash device to ensure the dewatering effect of the filter belt.
10. Adopt pneumatic tensioning and pneumatic automatic correction device to ensure the normal operation of the filter belt.
11. Reliable operation, equipped with infrared protection and emergency stop device.
12. Different specifications and models of filter belts can be configured according to different materials, with high filtration accuracy.