Bag filters are fabric collectors used for the separation of dust and solid particles from liquids such as inks, coolants, and paints as well as gaseous products. Industries attest to 99% efficiency on the use of bags, which they utilize in the treatment of the wastewater, beverage manufacture, chemical, paints, cooling water, and groundwater. The manufacturers have to place these filters in bag filter housing for them to function effectively. They’re among the most cost-efficient and secure filters among all other industrial filters and consist of a fabric bag and a motor that powers the machine.
Bags come in various lengths, sizes, and micron rating. The materials and the choice depend on the amount and size of the particulate that needs removal. Some of the materials used in their manufacture include Nylon, Ryton, Polyester, Nomex, Aramide, Polypropylene, and Teflon. Their diameter size ranges from 4-7 inches and a maximum depth of 32 inches. Their filtration rate varies from 1-1500 micron, although the capacity depends on the surface area of the bag. The liquid bag filters are not replaceable once clogged, but some of the gaseous ones are easy to clean either through mechanical, electrical, manual, or reverse flow methods.
Process of Filtration
The process of filtration involves the movement of liquids from the top of a filter house into the bags. The clear fluid then flows out of the bags at the bottom leaving the residue trapped inside the bag without any contact of the bag filter housing with any dirt. Most of the industrial bags are mostly surface-type filters. That means they favor concentrations of higher than 5mg/m³ while a few depth-type filters favor levels lower than 0.5mg/m³. Bags used in the filter of paints and coatings are silicone free to avoid contamination of the paints.
Industries That Use Bags for Filtration
A good industrial filter should minimize the costs of waste disposal, limit exposure of the workers to the filtration liquid, improve the quality of the final product, and reduce the filtration process. However, different industries use the bag filters different to meet their needs. Some of the industries using the bags include:
Mining and Chemical Industry
The industry uses stainless steel bags and comes with a stamp from ASME. The bags should have small holes to trap in even the micron sub-particles.
Wastewater may have solids of all types and sizes. Therefore, you need to get a bag that traps all of those articles from the water. Other water purification methods used together with the bag filtration include reverse osmosis and activated carbon process.
The sub-micron bags prevent the flow of proteins from the liquid as well as remove solids and grains from sugar. Brewing requires different kinds of bags to avoid adverse effects on the product. If you would like to learn more, visit Fil-Trek Corporation.