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Russian Application of Belt Filters in Reed Slurry Dewatering
The application of belt filters in reed slurry dewatering is an important part of the papermaking industry. Reed slurry is a plant fiber slurry made of reed fiber, and its dewatering process is crucial to the slurry quality and subsequent processes. The belt filter is widely used in reed slurry dewatering due to its continuous operation, efficient dewatering, and strong adaptability. The following is the application of belt filters in reed slurry dewatering.
Key Points in The Dehydration Process of Reed Slurry
Reed slurry is a kind of plant fiber slurry. Due to its long fiber, high moisture content, and thick fiber cell wall, it needs to be optimized in combination with the slurry characteristics during the dehydration process of the belt filter. The following is the specific process of reed slurry dehydration in each part of the belt filter.
Slurry pretreatment
Before entering the belt filter, reed slurry usually needs chemical or mechanical pretreatment (such as pH adjustment and flocculant addition) to improve the flocculation effect and dewatering efficiency of the fiber.
Gravity dewatering zone
The reed slurry is evenly spread on the filter belt through the feeding device and enters the gravity dewatering zone. At this stage, the free water in the slurry is naturally discharged through the filter belt under the action of gravity. Because the reed slurry fiber is long, it is easy to form coarse slurry flocs, and the free water is easy to discharge.
Wedge-shaped dewatering zone
After the slurry enters the wedge-shaped dewatering zone, the two filter belts gradually move closer to form a wedge-shaped space, which applies slight pressure to the reed slurry. This process discharges part of the bound water in the slurry through gentle squeezing, while making the slurry structure more stable, avoiding slurry leakage due to sudden pressure increase.
Pressurized dewatering zone
The slurry enters the pressurized dewatering zone and is squeezed by multi-stage rollers, applying high-pressure step by step. The bound water and part of the capillary water in the reed slurry are squeezed out, and the slurry fibers are compacted to form a high-density filter cake.
Unloading filter cake and cleaning filter belt
The reed slurry filter cake is separated and collected at the end of the filter belt by a scraper or other unloading device. The filter cake is in the form of flakes or blocks, which is convenient for subsequent processing. The filter belt is cleaned by a high-pressure water nozzle to remove reed fibers and residual slurry, maintaining water permeability and work efficiency.
The Role of Belt Filter in Reed Slurry Dewatering
Efficient solid-liquid separation
Reed slurry has a high moisture content. The belt filter can significantly reduce the moisture content of the slurry through a combination of gravity dewatering and pressurized dewatering, providing stable raw materials for subsequent processing steps (such as drying and papermaking).
Continuous operation, high efficiency
The belt filter adopts a continuous operation design, which can meet the needs of large-scale production of papermaking enterprises. The slurry is evenly spread through the feed end and discharged from the discharge end after multi-stage pressing to achieve efficient processing.
Low energy consumption and low operating cost
Compared with other mechanical dewatering equipment, the belt filter has lower energy consumption, less maintenance requirements during operation, and good overall cost control.
Large processing capacity and strong adaptability
The belt filter can handle high-concentration and low-concentration reed slurry, has strong adaptability, and can meet the production needs of enterprises of different sizes.
Conclusion
The application of belt filters in reed slurry dewatering not only improves production efficiency but also optimizes slurry quality and enterprise operating costs. For papermakers looking to increase production capacity, belt filters are a cost-effective option.
