(796 products available)
Ready to Ship
Ready to Ship
Rotary vacuum drum filter, which utilizes a semi-automated process, is used in the industries listed below according to specific needs.
Continuous-Cake-Type Filters
This type of rotary drum vacuum filter is used in conditions when the material concentration is high and requires thick filtration cake. These filters are characterized by a porous filter cloth that is tensioned on a cylindrical, rotating filter drum. The slurry will be poured on the rotating drum from a feed box located over the drum. The liquid will pass through the filter cloth, whereby the solid will remain on the drum. Filters manufactured for thick filtrate cakes will also be equipped with a scraper blade that periodically cuts the cake down, allowing it to transfer to the conveyor underneath for further processing.
Segmented-Cake-Type Filters
This segmented filter can operate at the same time using two or more different filter media. These machines consist of several segments of filter material where the slurry can be poured. The filtration drum filter segments can be easily interchanged depending on the types of cakes that are to be produced. The segments will also be designed to allow the solid cake of any thickness to detach easily.
Interstitial-Vacuum-Type Filters
These filters are used mainly when the cake thickness requirement is low and the suspension has a low solid content. On this filter type, the cloth covering the drum is stretched well, and only a small quantity of solid passes through the cloth to deposit on the internal cylindrical filter. Vacuum interstitial drums that are compact can be found in systems that utilize low-solid content liquids and where fine filtration is required. This is an area where pressure leaf filters may be useful to remove most of the solids before the liquid gets to the vacuum filter.
Segmented-Interstitial-Vacuum-Type Filters
This combines the two previous types and allows for fine filtration of the suspension with low solid content in a segmented manner. These filters operate like interstitial vacuum-type filters, but several areas of the filter are replaced, allowing them to conduct different filtration tasks. This function gives the operating team more flexibility to handle various liquids and requirements for vacuum filtration with low solid content.
Automatic Filtration Process
A vacuum filter rotary drum runs the filtration process automatically. The slurry pool is poured onto the drum, and as the drum rotates, the filter cloth separates the solids from the liquids. This process continues until the end of the drum rotation cycle, after which the dampened solids are dried. The cycle then repeats as the drum rotates once more into the slurry pool.
Filter Cloth and Filter Cake
The filter cloth on the rotary drum is the main element of the filtration process. The filter cloth is prepared according to the specific requirements of the materials that will be processed. Once the drum is rotated in the slurry, the solids will start to accumulate on the cloth, forming what is known in the filtration industry as the filter cake. Filter cakes will be different from one process to another, depending on the solid content in the slurry and the type of material that is being filtered.
Suction Filtration
The vacuum applied to the inside of the drum is what drives the liquid through the filter cloth. As solids collect on the cloth, the vacuum pulls the liquid through the interstitial spaces between the solid particles. This process is called suction filtration.
Filter Cake Growth
As the filtration process continues, filter cake will grow thicker. This is the solid material that accumulates on the filter cloth surface. The filter cake has two functions: First, it helps the remaining liquid pass through the cloth easily. Second, it helps trap finer particles to ensure that no matter the size of movable particles, they won't be able to pass through.
Drum Rotation and Filtration Cycle
The rotary filter vacuum filtration cycle is completed every time the drum makes a full rotation. Rotor-driven machinery typically controls the time taken for each cycle, allowing for optimal filtration speed and efficiency. Precise control over production operations is required to maintain the quality of the end product.
Blade Scraper and Cake Discharge
Blade scrapers are integral parts of a rotary vacuum filter, used to remove the filter cake from the filter cloth. The scraper is typically located at the end of the drum, close to the discharge area. As the cloth gets saturated with solids and filter cakes grow thicker, the scraper blade edges need to be adjusted to ensure proper tapping and cake removal.
Mining and Minerals
Rotary filters are widely used in dewatering mineral ores and concentrates in mining and mineral processing industries. They help recover valuable minerals like copper, gold and lithium by efficiently drying filter cakes. The continuous operation of these filters suits large-volume mineral slurries found in mining and mineral extraction. Since they handle high solid loads and thick filter cakes, they excel in high-demand applications. Their effectiveness in processing ores like gypsum and talc makes them imperative in the mining and mineral industries where gypsum is often mined because it is soft, white mineral rock, and talc because it is hardy, thicker and contains many layers of thin sheets.
Chemicals
Rotary vacuum drum filters are employed in chemical production for separating solids from slurries during catalyst recovery, crystallization and precipitation processes. They play a vital role in purifying chemicals, recycling catalysts and producing consistent chemical products.
Food Industry
In the food industry, these filters clarify liquids, separate yeast from beer, and process edible oils. Their robustness and ability to handle viscous slurries make them suitable for filtering oils from rappers, seed and crude oil. They also assist in recovering valuable by-products like yeast and pulp in wastewater treatment.
Pharmaceuticals
These filters are crucial in pharmaceuticals for separating and drying drug compounds, precipitates, and crystals. They ensure pure product extraction and support consistent batch processing in pharmaceutical manufacturing.
Pulp and Paper
In pulp and paper, rotary vacuum drum filters are used for processes like pulp washing, fiber recovery, and papermaking slurry dewatering. They stand out in efficiently separating solids from liquids at high capacity.
Wastewater Treatment
These filters aid in wastewater treatment by dewatering sludge and separating solids from liquid effluents. This rotary vacuum filter reduces solid content in wastewater and prepares sludge for disposal or further treatment.
To choose the ideal mechanical filter vacuum filter, one needs to factor in the following key considerations.
Filtering Needs
Identify the specific filtering objectives, whether to remove contaminants, capture particulate matter, or separate solids from liquids. Get the nature of the materials and the size of particles that need to be filtered.
Drum Size
Vacuum filters come in different sizes. Consider the amount of material that needs to be filtered regularly. For large filtering needs, going for a large vacuum filter is ideal because it completes the task faster. For smaller needs, a compact filter will do because it is easy to handle, takes less space and is relatively cheaper.
Filtration Efficiency
This efficiency largely depends on the filter medium used in vacuum filters. This is the material that is used to separate the solids from liquids, like filter paper, cloth or metal mesh. When choosing a vacuum filter, consider how fine or coarse the filter medium is. Fine filter mediums are good for capturing small particles and ensuring thorough filtration. Coarse filter mediums have larger openings and are suitable for capturing larger particles.
Material and Construction
The materials that comprise the vacuum filter affect its durability, performance and suitability for specific environments. Most filter mediums are made of steel, cloth and polymers. Steel filters are sturdy and readily applicable in harsh environments. They also offer support to other filter mediums and have high porosity. Polymer filters are lightweight and resistant to many chemicals and are often applied in high demand filtration. The construction of the vacuum filter determines its efficiency and strength. Go for filter vacuum mediums that have sturdy construction. They not only stand the wear and tear but also ensure that the filter operates as effectively as possible.
Maintenance
Factors such as ease of cleaning, replacement of filter elements and general upkeep should be considered when choosing a rotary vacuum filter. Go for those filters designed for easy maintenance because they save time and efforts.
A1. Filter aids are substances used to improve the efficiency and effectiveness of the filtration process, while filter mediums are the primary materials through which the actual filtration takes place. They help clear the filter medium faster and make it denser while preventing blinding. They include diatomaceous earth, perlite and cellulose. Filter mediums include vacuum filter papers, cloth or metal meshes that are the first line of defence in the filtration process.
A2. A rotary vacuum filter performs continuous vacuum-assisted filtration. The drum rotates through the slurry, and the vacuum draws the liquid through the filter medium, leaving the solids behind. Filter cake on the medium is then dried using temperature, air or vacuum.
A3. Industries that benefit from rotating vacuum drum filters (RVDFs) include mining and mineral, chemicals, food, pharmaceuticals, pulp and paper and wastewater treatment.
A4. RVDF is superior to other filtration methods due to its continuous operation, efficient solid-liquid separation, easy automated filter cake drying and suitability for large workloads.
浙公网安备 33010002000092号
浙B2-20120091-4