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Common filter media introduction

Views: 5     Author: Site Editor     Publish Time: 2022-05-25      Origin: Site

Commonly used filter media in the industry are:

① Woven material, filter cloth and filter mesh woven from natural or synthetic fibers, metal wires, etc., are the most commonly used filter media in industrial production. Such materials are cheap, easy to clean and replace, and the minimum particle size that can be retained is 5-65 μm. Single-strand filters made of fibers such as polyamide, polyester or polypropylene, with uniform texture, corrosion resistance and fatigue resistance, are gradually replacing other fabric filter cloths.

② Porous solids, including bisque, sintered metal or glass, or porous plastic tubes bonded by fine plastic powder. The minimum particle size that can be retained by such materials is 1 to 3 μm, and is often used to process suspensions containing a small amount of tiny particles.

③ Accumulation medium, such as granular materials such as sand, gravel, charcoal and diatomaceous earth, or accumulation layer of non-woven fibers such as glass wool. It is generally used for the treatment of suspensions with low solid content, such as urban water supply and sugar liquids to be purified. In addition, industrial filter paper can also be used in combination with the above-mentioned filter media to intercept a small amount of fine particles in the suspension. The manufacture and application of polymer porous membranes have been greatly developed, and are applied to the filtration of finer particles to obtain highly clarified liquids. Membranes suitable for filtering out 0.1-1μm particles are called microporous membranes; membranes suitable for filtering out 0.01-0.1μm particles are called ultrafiltration membranes (see membrane separation). Microporous membranes and ultrafiltration membranes are widely used in industries such as medicine, food, and biochemistry.negative ion non-woven fabric factory - Jiatecairfilter

Selection of filter media

When selecting a filter medium, the content of solid particles in the suspension, the distribution range of particle size, the effect of the filter medium on the clarification of the filtrate and the filtration rate should be considered. In addition, factors such as the selection of filtration equipment, the corrosiveness of the filtrate, and the temperature and pressure of the filtration operation are also involved.

The ability of filter media to capture solid particles

This relates to the separation order of filtering. The so-called capture capacity is the smallest particle size that can be retained. The capture capacity depends on the pore size and distribution of the medium itself. The table below shows the smallest particles that each type of filter media can capture.

Penetration

The permeability of the filter medium reflects its resistance to the flow of the filtrate, which affects the production strength of the filter and the filtration driving force---the pressure difference. The permeability of filter media is related to the porosity of the media itself.

Slag discharge and cleaning regeneration performance

The slag discharge ability refers to the ability to remove the filter cake from the surface of the medium by using the filter cake's own strategy or compressed air blowing, mechanical scraping and other measures after filtration. A continuous filter is a prerequisite for maintaining normal operation. During the filtration process, a small amount of filter residue particles are always blocked in the pores of the medium. After the slag unloading process of each operation cycle is completed, the particles must be cleaned from the surface and pores of the medium by means of flushing and purging to maintain the filtration efficiency of the medium. and performance. The regeneration performance mainly depends on the constituent material of the filter medium and the weaving and processing method (manufacturing process).

Chemical stability

Due to the variety of materials handled by the filtration process, their chemical properties vary. There are acidic, basic, strong oxidizing, organic solvents, etc., and they are all filtered at a certain temperature. This requires the selected filter medium structural material to have good chemical stability, chemical resistance, temperature change resistance and microbial resistance in the material to be processed. Generally speaking, polypropylene fibers have good acid resistance. Alkali and oxidant resistance, polyethylene fiber has stability to acid and alkali solution at room temperature, polyester material has good acid resistance.

Physical and mechanical properties of materials

The physical and mechanical properties of the material, including hygroscopicity, wear resistance, mechanical strength, elongation, etc., all affect the filtration performance and service life of the medium. Different types of filters have different requirements for the physical and mechanical properties of the medium. For example, the plate and frame filter has higher requirements on the mechanical strength of the filter cloth compared with the leaf filter and the drum filter. The belt filter has higher requirements on the strength of the filter cloth than the overturning disc filter, and requires the elongation to be as low as possible under a certain load.


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