How to choose a filter press filter cloth? What are the materials?

As questioned: How to choose filter press filter cloth? What are the materials?

How often should the filter cloth be replaced?

The filter press is exposed to acid and alkali corrosion, mechanical wear and the aging of the filter cloth itself during use, resulting in the life limit of the filter cloth of the filter press. According to the sludge treatment experience of Lianyungang Mingke, the filter cloth life of the filter press used in the ceramic industry and the coal industry is about 3 months to 5 months, and the filter cloth life of the filter press used for sewage treatment will be relatively long. Once the filter cloth is damaged, it should be replaced in time to prevent affecting the treatment effect and subsequent processes.

What are the models of filter cloth for plate and frame filter press:

Vinylon filter cloth. Polyester filter cloth.

Nylon filter cloth. Polypropylene filter cloth.

Filter ** Reference.

It is divided into chamber filter press, belt filter press, and belt concentration and dehydration machine, which is commonly used in sludge and food, which was used in chemical production at the beginning of the 18th century, and is still widely used in chemical, pharmaceutical, metallurgy, dye, food, brewing, ceramics and environmental protection industries. The filter press is composed of multiple filter plates and filter frames superimposed to form a filter chamber, and the pressure is the filter driving force.

Filter press classification.

The filter press is intermittent operation, and there are three types of plate and frame filter presses, chamber filter presses and vertical filter presses. The filter plate has stable performance, convenient operation, safety and labor-saving, and the metal and plastic steel filter plate is precision casting, high temperature resistance, high pressure resistance, and durable.

Usage process. Because the filter press itself is of the same specification, the different filtration precision, speed, etc. required for different filtration objects are realized by using different filter press filter cloths, also known as filter press filter bags, each filter press filter plate is wrapped with filter cloth, according to the acid and alkali resistance requirements, tensile strength, filtration accuracy, filtration speed and other requirements of different filter objects, first determine the filter cloth material and model used, and then according to the size and shape of the filter plate, process the matching filter cloth bag, and put it on the filter cloth. So the filter cloth is the heart of the filter, and the same is true in the filter press.

The selection of filter cloth is generally to choose weak alkali resistance, wear resistance, high corrosion resistance, high peeling ability, light texture, high porosity, through twisting, the strength can be higher.

Materials: polyester, vinylon filter cloth, nylon filter cloth, polypropylene filter cloth.

First of all, correct the filter press.

The filter cloth is not calculated in mesh. The mesh is a parameter of the screen.

The parameters of the filter cloth of the filter press are calculated based on the air permeability, that is, how much air can pass through each bottle of centimeters per minute.

For different materials, we will choose Lu Bu with different air permeability.

to adapt. No one green cloth is universal.

But there is also a certain rule, I have done a lot of material filtration experiments myself, and I feel that the filter cloth with an air permeability of 20 is relatively versatile.

However, for some materials that are very easy to filter, the filter cloth with an air permeability of 20 will affect the filtration efficiency.

Therefore, to choose a filter cloth, it is best to do experiments, so that you can find the best filter cloth for your material and process.

Abstract: Now many industries use filter presses, and the filter press workflow of these filter presses is the same, but the key role is the filter material, that is, the filter cloth. Just like the filter press, there are many classifications of filter cloth, so which filter cloth is better to choose in different industries?

1. For example, according to the raw materials: polyester filter cloth, polypropylene filter cloth, nylon filter cloth, aramid filter cloth and so on.

2. Distinguish according to the use of filter cloth on the filter: belt filter cloth, plate and frame filter cloth, centrifuge filter bag, etc.

3. Distinguish according to the material: filament filter cloth, monofilament filter cloth, tear membrane filter cloth, etc.

2. How to choose filter cloth for filter presses in different industries.

1. The polyester long fiber filter cloth has a smooth surface, good abrasion resistance, high strength, higher strength and better abrasion resistance after twisting, so that the fabric has good air permeability, fast water leakage and easy cleaning. The main uses are pharmaceutical, food, chemical, metallurgy, industrial filter presses, centrifuge filter cloth, etc.

2. The raw material structure of polyester staple fiber filter cloth is short and hairy, and the woven fabric is dense, and the particle interception is good, but the peeling property and air permeability are poor. The strength, abrasion resistance, and water leakage are not as good as polyester long-fiber filter cloth. The main uses are pharmaceutical, sugar, food, chemical, metallurgy, industrial filter presses, centrifuges, etc.

3. Cotton fiber filter cloth nylon fiber is resistant to strong alkali and weak acid. The strength loss is negligible after 16 hours of treatment with NaOH (10%) at 95, but nylon is not resistant to staring at divine light, and is easy to change color and become brittle, so nylon fabrics should not be exposed to the sun for a long time. Nylon 66 cannot be used in pharmaceuticals and food manufacturers, because it is toxic and harmful to people's health.

The main uses are rubber, ceramics, pharmaceuticals, food, metallurgy, etc.

4. Polypropylene staple fiber filter cloth, short fiber, spun yarn ribbon hair; The cloth surface is hairy, and the powder filtration and pressure filtration effects are better than those of long fiber; The main uses are: chemical, ceramic, pharmaceutical, smelting, manufacturing, mineral processing as filter bottom.

5. Polypropylene long fiber filter cloth, with long fibers and smooth yarns; industrial fabrics made of polypropylene staple fiber weaving; The industrial cloth made of polypropylene long fiber weaving has a smooth cloth surface and good air permeability, and is mainly used in chemical, ceramic, pharmaceutical, smelting, manufacturing, and mineral processing as a filter bottom.

6. Vinylon filter cloth can withstand the action of strong alkali, and has good hygroscopicity, easy to combine with rubber, and is a good material for use in the rubber industry, its disadvantage is that the temperature resistance is low, the temperature reaches 100, there is shrinkage, and it is not acid-resistant. It is mainly used in alkaline manufacturers and the rubber industry.

Differences: The tensile strength of the filter belt is different, the smoothness of the surface of the filter belt is different, and the workmanship of the glue of the filter belt joint is different.

Extended information: belt filter pressThe dewatering process of belt press filter can be divided into four important stages: pretreatment, gravity dehydration, pre-pressure dehydration and press dehydration in the wedge-shaped area.

The independent thickener section can easily filter the agglutinated sludge, which greatly increases the treatment capacity. The structure is simple, the operation is simple, and the maintenance is easy. Special concave and convex roller design, large processing capacity and low moisture content.

Youwei's collapse inspection is made of patented filter belt, which has fast filtrate separation, excellent mud cake peeling and less sludge residue. The sludge capture rate is good and the efficiency is high. High stability and excellent durability.

No noise or vibration. Low electricity consumption. Compared with the domestic sludge dewatering machine, and even other European and American brands of dewatering machines, the sludge dewatering machine is better than other models, and the main difference is that this filter cloth is different, because it is made of three kinds of vertical hair fibers of different lengths and electrostatic implantation, which is a non-sticky sludge filter cloth and the equipment with the least amount of cleaning water.

Scope of application. It is widely used in sludge dewatering treatment in urban domestic sewage, textile printing and dyeing, electroplating, papermaking, leather, brewing, food processing, coal washing, petrochemical, chemical, metallurgy, pharmaceutical, ceramics and other industries, and is also suitable for solid separation or liquid leaching process of industrial production.

Structural features. The structure of the series belt filter press is compact, the style is novel, the operation and management are convenient, the processing capacity is large, the moisture content of the filter cake is low, and the effect is good. Compared with similar types of equipment, it has the following characteristics:

1.The first gravity dewatering section is inclined type, so that the sludge is as high as 1700mm from the ground, so that the height of the sludge in the gravity dewatering section increases, and the gravity dewatering capacity is improved.

2.The gravity dewatering section is long, and the total length of the first and second gravity dewatering sections is more than 5m, so that the sludge is fully dewatered and loses fluidity before pressing. At the same time, the gravity dewatering section is also equipped with special mechanisms such as reversal, and the sludge filter cake can obtain the lowest water content through the action of "wedge" shape and "S" shape pressing.

3.The first dewatering roller adopts a "T" shaped drain trough, which allows a large amount of water after pressing to be quickly discharged, thus improving the dewatering effect.

4.The filter belt deviation is equipped with an automatic control device, and the filter belt tension and filter belt moving speed can be adjusted freely, which is convenient for operation and management.

5.Low noise and no vibration.

6.The dosage of chemical drugs is small.

The filter cloth of the filter press is the equipment used for the filter press to filter sludge food, and it is generally made of the following materials.

1. Polyester filter cloth Polyester filter cloth is acid resistant and weak alkali resistant. Good abrasion resistance, corrosion resistance, good recovery, poor electrical conductivity, temperature resistance is between 130-150 degrees Celsius.

2. Nylon filter cloth Nylon fiber has abrasion resistance, strong alkali resistance, and weak acid, but it is easy to change color, and it should not be exposed to sunlight.

3. Polypropylene filter cloth can be divided into two types: polypropylene staple fiber filter cloth and polypropylene long fiber filter cloth.

4. The strength of vinylon filter cloth is worse than that of polyester, the shape of the fabric is poor, the wear resistance is better, and the durability is 1-2 times that of pure cotton. It can withstand the action of strong alkali, good hygroscopicity, easy to combine with rubber, is a good material for use in the rubber industry, is not resistant to high temperature, the temperature does not reach 100 degrees Celsius, it will shrink, and it is not acid-resistant.

The filter cloth material is divided into polypropylene filter cloth, polyester filter cloth, nylon filter cloth, vinylon filter cloth, polyester mesh, and the safety purpose can be divided into liquid filter cloth, air filter cloth, conveyor belt, with test filter cloth, and 750B 108C 750AB monofilament filter cloth is used for general sewage treatment.

As questioned: What materials are there for filter press filter cloth?

Filter cloth mainly includes: polyester filter cloth for filter press, polypropylene filter cloth for filter press, nylon filter cloth for plate and frame filter press, and vinylon filter cloth for plate and frame filter press.

Broadly distinguished, the plate and frame filter press on the market is mainly steel filter plate, reinforced polypropylene filter plate two categories, reinforced polypropylene is the mainstream product on the market, the general polypropylene filter plate has native and regenerated, the original strength is relatively large, white, the quality of regeneration is not very good, it contains variegated colors (in the past, we bought the filter press filter plate in Henan is often broken, and later bought Chengdu Changjie filter, I took a closer look, it seems that the gap between the filter plate is quite large), However, the specific use environment is also related, and the high acid content and high temperature in some places will also cause the filter plate material to age rapidly.

It is currently the most commonly used, that is, polymer polypropylene. This material is very resistant to a wide range of acids and alkalis, including the strongest acid, hydrofluoric acid. However, the operating temperature range is relatively small. It can only withstand materials of up to 70°C for a short period of time.

It is an organic material with the best acid resistance and temperature resistance, and the normal temperature resistance can reach about 150°, but the alkali resistance is extremely poor.

3.Natural rubber filter plates, especially diaphragms, are still good with natural rubber, with good elasticity, but poor strength.

4.Aluminum filter plates, the lightest of all metal filter plates, but relatively less resistant to acids.

5.Cast iron filter plate, heavy weight, poor acid resistance, extremely high temperature resistance. It's just that the sealing surface must be made of organic materials, so there are certain limitations.

6.Stainless steel filter plate, acid and alkali resistance is good, but ** is the largest among all filter plates, after all, the material itself is expensive, and the machining time is very large.

Plate and frame filter press is a common sludge treatment equipment. It has the advantages of large filtration driving force, high solid content of filter cake, clear filtrate, high solid rate, and high consumption of conditioning drugs, and is generally used in small sewage plants. Below, Hu Ning will introduce the design requirements of the plate and frame filter press!

1) The filtration pressure is about 4 6kg cm2);

2) The filtration cycle is not more than 4h;

3) Each filter can be equipped with a sludge pressure pump, and the pump should be a plunger type;

4) The volume of compressed air is not less than 2m3 min per 1m3 filter chamber (calculated according to standard working conditions);

5) Attention should be paid to good ventilation, high-pressure flushing system, sludge grinder setting before conditioning, mud cake crusher setting after filter pressing, etc.

The design method of filter press dewatering is mainly based on the sludge treatment capacity, dewatered sludge concentration, filter press working procedure, filter pressure and so on to calculate the mud cake yield, the required filter press area and the number of units.

As questioned: What are the materials of the filter plate of the plate and frame filter press?

1. Rubber filter plate and filter frame.

Rubber is a good acid and alkali resistant material, but its practicality is limited by temperature, generally not greater than 75, and there is aging phenomenon.

2. Plastic filter plate.

The plastic filter plate used in the plate and frame filter press is an improved polypropylene plastic filter plate, in which auxiliary materials such as filler, toughening agent, and anti-aging agent are added, so that it has good advantages.

3. Glass filter plate.

The glass filter plate is the form of glass fiber reinforced plastic made of synthetic resin glued material, and its strength is increased by glass fiber. Such filter plates have the following advantages: light weight and high strength; Resistant to corrosion of acid, alkali, salt and other media, and has a long service life; The temperature of the filtrate can be about 100 °C, and the heat resistance is good.

The disadvantage of it is that it is the same as plastic, it has to age, but it is slower than plastic.

4. Wood filter press filter plate.

The wood filter plate is generally made of shirt wood, which has good sealing and is not easy to leak. It is more convenient to manufacture and process, and the weight is lighter than the worries of other materials, which is convenient for transportation and movement. The disadvantage is that the strength of the wood itself is not high, so the filter plate made is easy to be damaged, and it is easy to be corroded during the use period.